Transformers

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Transformers
5.1Introduction
Transformers
5.1.1Overview
258
258
5.2Reliability and Project Performance
260
5.3Transformer Loss Evaluation
262
5.4Power Transformers
264
5.4.1Large Power Transformers
264
5.4.2Medium Power Transformers
265
5.4.3Small Power Transformers
265
5.5Reactors
266
5.6Special Transformers
for Industrial Applications
267
5.7Phase-Shifting Transformers
269
5.8HVDC Transformers
270
5.9Distribution Transformers
271
5.9.1Liquid-Immersed Distribution Transformers
for European/US/Canadian Standard
271
5.9.2Voltage Regulators
274
5.9.3GEAFOL Cast-Resin Transformers
275
5.9.4GEAFOL Special Transformers
280
5.10Traction Transformers
292
5.11Transformer Lifecycle Management
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257
5 Transformers
5.1 Introduction
5.1.1 Overview
Whether in infrastructure systems, industry or households,
transformers always play a key role in the reliable transmission
and distribution of power. The construction, rated power,
voltage level and scope of the application are all key factors that
determine the transformer’s design.
Siemens provides the right transformer for every need – from
compact distribution transformers to large power transformers
with ratings far above 1,000 MVA. The Siemens product range
covers all mainstream requirements like UHV DC applications,
low noise emission and environmentally friendly products with
alternative insulation liquids, also embedded in a complete
power system from generation via transmission to distribution
networks. The long-term reliability of a transformer begins with
its initial high quality. Then transformer lifecycle management
measures maintain that quality throughout the transformer’s
entire life.
5
Fig. 5.1-1 and table 5.1-1 are an overview of how various transformers can be used in a network.
Global footprint
Emerging countries are not just “extended workbenches” for
producing goods. First and foremost, they are important future
markets. Through its own local production and sales locations,
Siemens provides service to customers in the most important
global markets. The local presence of Siemens in many countries
also ensures that customers have better access to Siemens
services and that they benefit from an efficient and effective
distribution of Siemens resources as part of a global network. As
Siemens factories around the world develop and produce their
products, Siemens also encourages them to share their expertise.
Siemens meets the growing global demand for transformers in a
variety of ways: by further optimization of value-added steps in the
worldwide network, by use of approaches such as vertical integration and by the pursuit of programs for boosting productivity.
In 2015 the Ecodesign Directive from the European Commission takes effect. The new regulations will apply throughout
Europe starting from July 2015; an additional stage with
stricter minimum standards is planned for 2021. Find the
complete document HYPERLINK here: www.eceee.org/
ecodesign/products/distribution_power_transformers/
revised_ecodesign_directive
For further information:
www.siemens.com/energy/transformers
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Transformers
5.1 Introduction
5
Fig. 5.1-1: Product range of Siemens transformers
Generator and
system
transformers
Above 2.5 MVA up to more than 1,000 MVA, above 30 kV up to 1,500 kV (system and system
Phase shifters
To control the amount of active power by changing the effective phase displacement
Reactors
Liquid-immersed shunt and current-limiting reactors up to the highest rated powers
eactors for HVDC transmission systems
R
HVDC transformers
ransformers and smoothing reactors for bulk power transmission systems up to 800 kV DC
T
ransformers for DC coupling of different AC networks
T
Cast-resin
distribution and
power transformers
GEAFOL
100 kVA to more than 40 MVA, highest voltage for equipment up to 36 kV, of 3-phase or 1-phase
Liquid-immersed
distribution
Transformers
10 to 2,500 kVA, highest voltage for equipment up to 36 kV, with copper or aluminum windings,
Special
transformers for
industry
lectric arc furnace transformers
E
lectric arc furnace series reactors
E
DC electric arc furnace transformers
Rectifier transformers
Converter transformers for large drives
Traction transformers mounted on rolling stock
Traction
transformers
Transformer
lifecycle
management
interconnecting transformers, with separate windings or auto-connected), with on-load tap
changers or off-circuit tap changers, of 3-phase or 1-phase design
design, GEAFOL-SL substations
hermetically sealed or with conservator of 3- or 1-phase design
pole mounted transformers and distribution transformers acc. to IEC and CS/IEEE with amorphous
cores
ondition assessment and diagnostics
C
nline monitoring
O
Consulting and expertise
Maintenance and lifecycle extension
Spare parts and accessories
Repair and retrofit
Transport, installation and comissioning
Table 5.1-1: Product range of Siemens transformers
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259
Transformers
5.2 Reliability and Project
Performance
The quality strategy in the transformer business is based on the
three cornerstones of product, people and process quality
(fig. 5.2-1). The objective is to achieve the greatest customer
satisfaction with cost-efficient processes. This is only possible if
all employees are involved in the processes have a profound
understanding of the customer needs and specific requirements
in the transformer business.
The strategy is implemented in the form of mandatory elements.
These elements cover product and service quality, which is visible
to customers; personnel quality, which is achieved by training
and ongoing education; and process quality in all processes used.
Business and process-specific indicators must be used to ensure
that each single element is measurable and transparent.
Nine mandatory elements are defined:
• Customer integration
• Embedded quality in processes and projects
• Consequent supplier management
• Business-driven quality planning
• Focused quality reporting
• Qualification of employees on quality issues
• Continuous improvement
• Management commitment
• Control and support role of quality manager.
5
Elements of quality (mandatory elements)
Customer integration
Customer integration depends on the consistent use of:
• Analysis tools for customer requirements and market studies
• Analysis of customer satisfaction
• Professional management of feedback from and to the
customer
• Complaint management.
Customer requirements need to be precisely defined in a specification. And the specification must be continuously updated
throughout the definition phase of a transformer project. The
actual requirements must also be available to all responsible
employees.
Rapid feedback loops – in both directions – are essential in order
to increase customer trust and satisfaction.
Siemens resolves customer complaints to the customer’s satisfaction in a timely manner through its complaint management
system.
Embedded quality in processes and projects
The quality of the processes used to produce a product has a
significant impact on the quality of the product that is actually
produced. Process discipline and process stability can be
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Product/Service
quality
Greatest possible
customer
satisfaction …
Process
quality
Quality
strategy
... combined with
efficient processes
results in the best
cost position
Personnel
quality
... and best trained
and motivated employees …
Fig. 5.2-1: Cornerstones of quality strategy
achieved by a high degree of process standardization. All processes should be standardized for all employees based on simple
procedures. If this condition is met, it is possible to implement
clearly defined work instructions (fig. 5.2-2).
Quality gates are placed at points in the process at which
quality-relevant decisions are necessary. The following quality
gates are mandatory for the power transformer business.
• Bid approval
• Entry order clarified
• Release of design
• Release of fully assembled transformer
• Evaluation of project.
For each quality gate, there is a clear definition of participants,
preconditions, results (traffic light) and the escalation process, if
necessary. If the result is not acceptable, the process must be
stopped until all requirements are fulfilled.
Supplier management
The quality of the product depends not only on the quality of the
own processes but also on that of the suppliers. Problems and
costs caused by inadequate supplier quality can only be reduced
by a systematic supplier management process that includes:
• Selection
• Assessment
• Classification
• Development
• Phasing out of suppliers as well as the support process
“Supplier Qualification”.
Transformers
5.2 Reliability and Project Perfomance
A further condition for a high level of supplier quality is close
cooperation with the suppliers. Joint development of requirements for suppliers and processes leads to continuous improvements in quality. In this context, supplier know-how can also be
used to create innovations. This aspect of the relationship with
suppliers is becoming more and more important, especially in
the transformer business.
SIEMENS
TPD
2.01.02
Core assembly – stacking core
laminates
PEQ
SIEMENS
PEQ
Page 1/6
1. Purpose/objective
Process description for the manufacture of transformer core
within the tolerances which are laid down
applies to all the core forms of the power transformers
does not apply to the cores of compensating reactors
Adjusting the
construction
supports
3. Process overview/description
Business-driven quality planning
Planning quality means analyzing possible future scenarios and
anticipated problems and taking preventive steps to solve those
problems. It is crucial that both current and future critical business factors are considered in planning. That means that quality
is based on business-driven planning and specific objectives,
activities and quantitative indicators.
Stack of core laminations – dimensions checked by the supplier to
ensure that they agree with the drawing
Frame parts – dimensions checked by the supplier to ensure that they
agree with the drawing
Insulating parts – dimensions checked by the supplier (internal ore
external )to ensure that they agree with the drawing
washers, small accessories Job – related core drawings
Process report TPD 2.01.01
Tools
Assembly area with special support beams for fixing the core
laminations which have been put on into position
Stacking
core
laminates
Measure-Measure
ment
> Setting the middle distance of the support beams to one
another in accordance with the drawing guideline
> Tolerance +/–5 mm to the desired size
Integrated slewing mechanism for mounting the finished core
> Setting the clearance of the support
trestles (on the support beams) for
the core-limb laminations
Process owner
Staff trained in core assembly
Adjusting
the support
trestles
> The position of support trestles are to be
placed in the middle between the single
bandages
> The position and clearance of the
bandages are defined in the core
drawing
Completed core with clamping frame also completely mounted
OUTPUT
Process report TPD 2.01.02
Max. sheet width BS
Measure-Measure
ment
Checked/approved:
Dr. Knorr
Clearance support trestles
The following clearances
apply to cores without
single bandages (e.g.
wound bandage cylinders):
References/guidelines, recommendations
Stack height tolerances as in drawing N00 08 792
Arrangement of the cooling duct shims as in drawing N10 11 100
Locking the screwed connections in accordance with TPD 3.036.01
Measurement of insulation resistance with TUQ 1634
Drawn up by: Matthes
As of date:
2004-02
Drawn up by:
Matthes
Checked/approved:
Middle distance
support trestles
< 650
550
650 to 800
450
800 to 1,000
350
1,000 to 1,200
300
1,200 to 1,500
The passing on as well as the duplication of this document. use and communication of its contents is not permitted. nor may thecontents be expressed. Offenders are liable to pay damages. All rights
reserved. in particular for the case of patent granting or GM-entry
Focused quality reporting
Reporting is based on:
• Focused key performance indicators such as non-conformance
costs, external failure rate, internal failure rate and on-time
delivery
• Concrete quality incidents
• Root cause analysis of quality problems including definition of
corrective and preventive measures.
Page 1/6
Subprocess 1:
Setting up the construction devices and limit stops
2. Scope/application
INPUT
INPUT
TPD
2.01.02
Core assembly–stacking core
laminates
4. Process sequence
Dr. Knorr
As of date:
250
2004-02
The passing on as well as the duplication of this document. use and communication of its contents is not permitted. nor may thecontents be expressed. Offenders are liable to pay damages. All rights
reserved. in particular for the case of patent granting or GM-entry
Fig. 5.2-2: Example of standardized working instruction
5
For customers, the reliability of transformers is of special importance. ANSI C57.117 has made an attempt to define failures.
Based on this definition, statistics on in-service failures and
reliability values can be derived. An example for power transformers appears in table 5.2-1.
Qualification of employees on quality issues
People are the decisive factor influencing quality. Therefore, all
employees involved in the processes must have the skills and
abilities appropriate to the quality aspects of the process steps
they perform. Any qualification measures that may be necessary
must be determined on the basis of a careful analysis of existing
deficits.
Continuous improvement
Because “there is nothing that cannot be improved”, continuous
improvement must be an integral part in all processes.
The objective is to continue optimizing each process step. This is
also the purpose of improvement teams. Appropriate coaching
of these teams should make it possible to reach almost all
employees.
E T TR In-service failure statistic 2000 – 2009 for power transformers
based on ANSI C 57.117
E T TR
Plant
1
Plant
2
Plant
3
Plant
4
Plant
5
Plant
6
Plant
7*
Plant
8
Plant
9
Plant
10
Plant
11
Plant
12
Plant
13*
Plant
14**
Plant
15
N
11,278
572
1,704
755
793
774
534
–
735
1,076
705
649
994
–
1007
980
SY
51,429
2,358
7,479
3,858
3
4,326
1,996
–
3,341
4,561
4,17
2,889
4,899
–
3,781
4,771
91
9
7
10
11
1
11
–
3
6
2
7
8
–
3
13
FRe (%)
0.18
0.38
0.09
0.26
0.37
0.02
0.55
–
0.09
0.13
0.05
0.24
0.16
–
0.08
0.27
MTBF (yrs)
565
262
1068
386
273
4,326
181
–
1,114
760
2,085
413
612
–
1,26
367
nF
* Plant 7 and 13: new plants; ** Plant 14: 9 years 2001 – 2009
N = No. of units in service
SY = No. of service years
nF = No. of units failed
FRe (%) = Failure rate = nF × 100/SY
MTBF (yrs) = Mean time between failures = 100/FRe
FRe ≤ 0.5 %
0.5 % < FRe ≤ 1.0 %
1.0 % < FRe ≤ 1.5 %
1.5 % < FRe ≤ 2.0 %
FRe >
2.0 %
excellent
good
satisfactory
acceptable
not acceptable
Table 5.2-1: In-service failure statistic
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Transformers
5.2 Reliability and Project Perfomance
Methods like, Kaizen, 5S and methods and tools from Six Sigma
e.g. DMAIC circle, FMEA, IPO are helpful in supporting this
continuous improvement process (fig. 5.2-3).
Management commitment
Every manager in a company also bears responsibility for quality.
Thus, each manager’s actions must be characterized by a high
level of quality awareness.
The level of commitment shown by all levels of management in
the event of quality problems, the establishment of quality
demands and the creation of targeted quality controls in day-today work together produce a culture in which there is a high
level of quality.
5
The sharply increased cost of electrical energy has made it
almost mandatory for buyers of electrical machinery to carefully
evaluate the inherent losses of these items. For distribution and
power transformers, which operate continuously and most
frequently in loaded condition, this consideration is especially
important. As an example, the added cost of loss-optimized
transformers can in most cases be recovered via savings in
energy use in less than three years.
Control and support role of the quality manager
The role of the quality manager is of fundamental importance
for well-running processes. The quality manager combines a
supporting role with that of a neutral controller. Quality management must be directly involved in processes and projects.
The independence of the quality department and individual
quality managers in the processes and projects must be guaranteed and agreed by top management.
Low-loss transformers use more and better materials for their
construction and are thus intially more expensive than low-cost
transformers. By stipulating loss evaluation figures in the transformer inquiry, the manufacturer receives the necessary incentive to provide a loss-optimized transformer rather than the
low-cost model. Detailed loss evaluation methods for transformers have been developed and are described accurately in
the literature. These methods take the project-specific evaluation factors of a given customer into account.
Conclusion
The quality of a transformer is based on the quality of all processes that are necessary – from project acquisition to project
closing. The quality of the processes depends essentially on
people. Only well-trained and motivated employees are able to
guarantee that a process will be performed with a high degree
of quality.
A simplified method for a quick evaluation of different quoted
transformer losses makes the following assumptions:
• The transformers are operated continuously.
• The transformers operate at partial load, but this partial load is
constant.
• Additional cost and inflation factors are not considered.
• Demand charges are based on 100 % load.
Define
Our process
should be like this
Check
DpMO
PONC x 1000 RMB
7000
6000
5000
DpMO
NCC
140
120
100
Measure
4000
3000
2000
1000
0
Are we
improving?
DMAIC
circle
Improve
What must be done
in order to achieve
the goal
How far are we
from the goal
Analyze
What is preventing
us to fulfill the
requirements
Fig. 5.2-3: DMAIC circle
ANSI Standard C57.117, 1986,
Guide for Reporting Failure Data for Power Transformers
and Shunt Reactors on Electric Utility Power Systems.
262
5.3 Transformer Loss
Evaluation
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
The total cost of owning and operating a transformer for one
year is thus defined as follows:
• Capital cost (CC), taking into account the purchase price (Cp),
the interest rate (p) and the depreciation period (n)
• Cost of no-load loss (CP0) based on the no-load loss (P0) and
energy cost (Ce)
• Cost of load loss (CPk) based on the load loss (Pk), the
equivalent annual load factor (a) and energy cost (Ce)
• Cost resulting from demand charges (Cd) based on the amount
set by the utility and the total kW of connected load (fig. 5.3-1).
The following examples show the difference between a low-cost
transformer and a loss-optimized transformer (fig. 5.3-2).
Note that the lowest purchase price is unlike the total cost of
ownership.
Transformers
5.3 Transformer Loss Evaluation
Capital cost
Example: Distribution transformer
taking into account the purchase price Cp, the interest rate p,
and the depreciation period n
Depreciation period
Interest rate
Depreciation factor
Energy charge
Demand charge
Equivalent annual load factor
Cc = Cp · r / 100 [amount / year]
Cp = purchase price
r
q
p
n
= p . qn / (qn –1) = depreciation factor
= p / 100 + 1 = interest factor
= interest rate in % p.a
= depreciation period in years
Cost of no-load loss
based on the no-load loss P0, and energy cost Ce
CP0 = Ce · 8,760 h / year . P0
Ce = energy charges [amount / kWh]
P0 = no-load loss [kW]
a2
Pk
a = constant opperation load / rated load
Pk = copper loss [kW]
Cost resulting from demand charges
based on the no-load loss P0, and energy cost Ce
CD = Cd (P0 + Pk)
Cd = demand charges [amount / (kW . year)]
Fig. 5.3-1: Calculation of the individual operation cost of a
transformer in one year
B. Loss-optimized transformer
P0 = 16 kW
no-load loss
Pk = 124 kW
load loss
C p = € 585,000 purchase price
.
Cc = 521,000 13.39
100
.
C c = 585,000 13.39
100
= € 69, 762 / year
CP0 = 0.25 . 8,760 . 19
= € 41,610 / year
= € 234,067 / year
based on the load loss Pk, the equivalent anual load factor a,
and energy cost Ce
α = 0.8
no-load loss
P0 = 19 kW
Pk = 167 kW
load loss
Cp = € 521,000 purchase price
CPk = 0.25 . 8,760 . 0.64 . 167
Cost of load loss
C Pk = Ce · 8,760 h / year
A. Low-cost transformer
n = 20 years
p = 12 % p. a.
r = 13.39
Ce = 0.25 € / kWh
Cd = 350 € / (kW . year)
CD = 350 · (19 + 167)
= € 65,100 / year
Total cost of owning and operating
this transformer is thus:
€ 410,539 / year
= € 78,332 / year
C P0 = 0.25 · 8,760 · 16
= € 35,040 / year
5
CPk = 0.25 · 8,760 · 0.64 · 124
= € 170,624 / year
CD = 350 · (16 + 124)
= € 49,000 / year
Total cost of owning and operating
this transformer is thus:
€ 332,996 / year
The energy saving of the optimized distribution transformer of
€ 77,543 per year pays for the increased purchase price in less
than one year.
C. Minimum efficiency
as per CSA
P0 = 0.182 kW
Pk = 0.966 kW
Cp = € 2,355
no-load loss
load loss
purchase price
D. High efficiency transformer
(Amorphous core)
P0 = 0.078 kW
Pk = 0.732 kW
Cp = € 2,654
no-load loss
load loss
purchase price
.
Cc = 2,355 13.39
100
.
Cc = 2,654 13.39
100
= € 315 / year
= € 355 / year
CP0 = 0.25 . 8,760 . 0.182
= € 399 / year
CPk = 0.25 . 8,760 . 0.64 . 0.966
= € 1,354 / year
CD = 350 · (0.182 + 0.966)
= € 402 / year
Total cost of owning and operating
this transformer is thus:
€ 2,470/ year
CP0 = 0.25 . 8,760 . 0.078
= € 171 / year
CPk = 0.25 . 8,760 . 0.64 . 0.732
= € 1,026 / year
CD = 350 · (0.078 + 0.732)
= € 284 / year
Total cost of owning and operating
this transformer is thus:
€ 1,836 / year
The energy saving of the optimized distribution transformer of
€ 634 per year pays for the increase purchase price in less
than one year.
Fig. 5.3-2: Example for cost saving with optimized distribution
transformer
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263
Transformers
5.4 Power Transformers
5.4.1 Large Power Transformers
In the power range above 250 MVA, generator and network
intertie transformers with off-load or on-load tap changers, or a
combination of both, are recommended. Depending on the on-site
requirements, they can be designed as multiwinding transformers
or autotransformers, in 3-phase or 1-phase versions. Even with
ratings of more than 1,000 MVA and voltages up to 1,200 kV
(800 kV), the feasibility limits have not yet been reached. We
manufacture these units according to IEC 60076 as well as other
international and national standards (e.g., ANSI/IEEE), (fig. 5.4-1).
Generator step-up (GSU) transformers
GSU units transform the voltage up from the generator voltage
level to the transmission voltage level, which may be as high as
1,200 kV system voltage. Such transformers are usually YNd-connected.
5
In order to make an inquiry regarding a GSU power transformer,
the technical data for the items in this section are required.
Step-down transformers
Step-down transformers transform the voltage down from the
transmission voltage level to an appropriate distribution voltage
level. The power rating of step-down transformers may range up
to the power rating of the transmission line.
Fig. 5.4-1: Large power transformer
264
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System interconnecting transformers
System interconnecting transformers connect transmission
systems with different voltages together so that active as well as
reactive power can be exchanged between the systems.
Main specification data
• Standard
• Installation – indoor/outdoor
• Max. ambient air temperature
• Rated frequency f
• Vector group
• Rated power S
• Primary rated voltage UrHV
• Tapping range/taps
• Voltage regulation
• Secondary rated voltage UrLV
• Impedance uk at Sr and Ur
• Max. sound power level LWA
• Insulation level HV-Ph – Um/AC/LI
• Insulation level HV-N – Um/AC/LI
• Insulation level LV-Ph – Um/AC/LI
• Type of cooling
• HV connection technique
• LV connection technique
• Transportation medium
• Losses.
Transformers
5.4 Power Transformers
5.4.2 Medium Power Transformers
Medium power transformers with a power range from 30 to
250 MVA and a voltage of over 72.5 kV are used as network and
generator step-up transformers (fig. 5.4-2).
Specific items
• Transformer design according to national and international
standards (IEC/ANSI) with or without voltage regulation
• 3-phase or 1-phase
• Tank-attached radiators or separate radiator banks.
Main specification data
• Number of systems (HV, LV, TV)
• Voltage and MVA rating
• Regulation range and type
• Vector group
• Frequency
• Losses or capitalization
• Impedances
• Type of cooling
• Connection systems (bushing, cable)
• Noise requirements (no-load, load and/or total noise)
• Special insulation fluid
• Application of high temperature/extra small size operation.
Fig. 5.4-2: Medium power transformer with natural-oil-based
insulation fluid
5
5.4.3 Small Power Transformers
Small power transformers are distribution transformers from 5 to
30 MVA with a maximum service voltage of 145 kV. They are used
as network transformers in distribution networks (fig. 5.4-3).
This type of transformer is normally a 3-phase application and
designed according to national and international standards. The
low-voltage windings should be designed as foil or layer windings. The high-voltage windings should use layer or disc execution, including transposed conductors. Normally, the cooling
type is ONAN (oil-natural, air-natural) or ONAF (oil-natural,
air-forced). The tapping can be designed with off-circuit or
on-load tap changers (OCTC or OLTC).
Main specification data
• Voltage and MVA rating
• Frequency
• Regulation range and type
• Vector group
• Losses or capitalization
• Impedances
• Noise requirements
• Connection systems (bushing, cable)
• Weight limits
• Dimensions
• Information about the place of installation
• Special insulation fluid
• Application of high temperature/extra small size operation
• Type of cooling.
Fig. 5.4-3: Small power transformer
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Transformers
5.5 Reactors
In AC networks, shunt reactors and series reactors are widely
used in the system to limit the overvoltage or to limit the shortcircuit current. With more high-voltage overhead lines with long
transmission distance and increasing network capacity, both
types of reactors play an important role in the modern network
system.
Made for every requirements
Oil-filled reactors are manufactured in two versions:
• With an iron core divided by air gaps
• Without an iron core, with a magnetic return circuit.
Oil-filled reactors offer individual solutions: They satisfy all the
specified requirements regarding voltage, rating, type of operation, low-noise and low loss and type of cooling, as well as transportation and installation.
The windings, insulation tank monitoring devices and connection method are practically the same as those found in the
construction of transformers.
5
Shunt reactors
For extra-high-voltage (EHV) transmission lines, due to the long
distance, the space between the overhead line and the ground
naturally forms a capacitor parallel to the transmission line,
which causes an increase of voltage along the distance.
Depending on the distance, the profile of the line and the power
being transmitted, a shunt reactor is necessary either at the line
terminals or in the middle. An liquid-immersed shunt reactor is a
solution. The advanced design and production technology will
ensure the product has low loss and low noise level.
Shunt reactors also can be built as adjustable shunt reactors.
This offers the possibility in fine tuning the system voltage and
also the reduction of high-voltage equipment by substitution
of several unregulated reactors by a regulated one.
Series reactors
When the network becomes larger, sometimes the short-circuit
current on a transmission line will exceed the short-circuit
current rating of the equipment. Upgrading of system voltage,
upgrading of equipment rating or employing high-impedance
transformers are far more expensive than installing liquidimmersed series reactors in the line. The liquid-immersed design
can also significantly save space in the substation.
Specification
Typically, 3-phase or 1-phase reactors should be considered first.
Apart from the insulation level of the reactor, the vector group,
overall loss level, noise level and temperature rise should be
considered as main data for the shunt reactor.
Although the above data are also necessary for series reactors,
the rated current, impedance and thermal/dynamic stability
current should also be specified.
266
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Fig. 5.5-1: Reactor
Transformers
5.6 Special Transformers for
Industrial Applications
A number of industry applications require specific industrial
transformers due to the usage of power (current) as a major
resource for production. Electric arc furnaces (EAF), ladle furnaces (LF) and high-current rectifiers need a specific design to
supply the necessary power at a low-voltage level. These transformer types, as well as transformers with direct connection to a
rectifier are called special-purpose or industrial transformers,
whose design is tailor-made for high-current solutions for
industry applications.
Electric arc furnace transformers
EAF and LF transformers are required for many different furnace
processes and applications. They are built for steel furnaces,
ladle furnaces and ferroalloy furnaces, and are similar to short or
submerged arc furnace transformers (fig. 5.6-1).
EAF transformers operate under very severe conditions with
regard to frequent overcurrents and overvoltages generated by
short circuit in the furnace and the operation of the HV circuitbreaker. The loading is cyclic. For long-arc steel furnace operation, additional series reactance is normally required to stabilize
the arc and optimize the operation of the furnace application
process.
5
Fig. 5.6-1: Electric arc furnace transformer
Specific items
EAF transformers are rigidly designed to withstand repeated
short-circuit conditions and high thermal stress, and to be
protected against operational overvoltages resulting from the
arc processes. The Siemens EAF reactors are built as 3-phase
type with an iron core, with or without magnetic return circuits.
Design options
• Direct or indirect regulation
• On-load or no-load tap changer (OLTC/NLTC)
• Built-in reactor for long arc stability
• Secondary bushing arrangements and designs
• Air or water-cooled
• Internal secondary phase closure (internal delta).
Main specification data
• Rated power, frequency and rated voltage
• Regulation range and maximum secondary current
• Impedance and vector group
• Type of cooling and temperature of the cooling medium
• Series reactor and regulation range and type (OLTC/NLTC).
DC electric arc furnace transformers
Direct-current electric arc furnace (DC EAF) transformers are
required for many different furnace processes and applications.
They are built for steel furnaces with a Thyristor rectifier. DC EAF
transformers operate under very severe conditions, like rectifier
transformers in general but using rectifier transformers for
furnace operation. The loading is cyclic.
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
267
Transformers
5.6 Special Transformers for Industrial Applications
Rectifier transformers
Rectifier transformers are combined with a diode or Thyristor
rectifier. The applications range from very large aluminum
electrolysis to various medium-size operations. The transformers
may have a built-in or a separate voltage regulation unit. Due to
a large variety of applications, they can have various designs up
to a combination of voltage regulation, rectifier transformers in
double-stack configuration, phase-shifting, interphase reactors,
transductors and filter-winding (fig. 5.6-2).
Specific items
Thyristor rectifiers require voltage regulation with a no-load tap
changer, if any. A diode rectifier will, in comparison, have a
longer range and a higher number of small voltage steps than an
on-load tap changer. Additionally, an auto-connected regulating
transformer can be built in the same tank (depending on transport and site limitations).
Design options
• Thyristor or diode rectifier
• On-load or no-load tap changer (OLTC/NLTC)/filter winding
• Numerous different vector groups and phase shifts possible
• Interphase reactor, transductors
• Secondary bushing arrangements and designs
• Air or water-cooled.
5
Main specification data
• Rated power, frequency and rated voltage
• Regulation range and number of steps
• Impedance and vector group, shift angle
• Type of cooling and temperature of the cooling medium
• Bridge or interphase connection
• Number of pulses of the transformer and system
• Harmonics spectrum or control angle of the rectifier
• Secondary bushing arrangement.
Converter transformers
Converter transformers are used for large drive application, static
voltage compensation (SVC) and static frequency change (SFC).
Specific items
Converter transformers are mostly built as double-tier, with two
secondary windings, allowing a 12-pulse rectifier operation.
Such transformers normally have an additional winding as a
filter to take out harmonics. Different vector groups and phase
shifts are possible.
Main specification data
• Rated power, frequency and rated voltage
• Impedance and vector group, shift angle
• Type of cooling and temperature of the cooling medium
• Number of pulses of the transformer and system
• Harmonics spectrum or control angle of the rectifier.
268
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Fig. 5.6-2: Rectifier transformer for an aluminum plant
Line feeder
This kind of transformer realizes the connection between the
power network and the power supply for the train. Transformer
is operating in specific critical short-circuit condition and overload condition in very high frequencies per year, higher reliability is required to secure the train running in safety.
Main specification data
• Rated power, frequency and rated voltage
• Impedance and vector group
• Overload conditions
• Type of cooling and temperature of the cooling medium
• Harmonics spectrum or control angle of the rectifier.
Design options
• Direct connection between transmission network and railway
overheadcontactline
• Frequence change via DC transformation
(e.g. 50 Hz – 16,67 Hz)
• Thyristor or diode rectifier
• On-load or no-load tap changer (OLTC/NLTC)/filter winding
• Secondary bushing arrangements and designs
• Air or water-cooled.
Transformers
5.7 Phase-Shifting
Transformers
A phase-shifting transformer is a device for controlling the
power flow through specific lines in a complex power transmission network.The basic function of a phase-shifting transformer
is to change the effective phase displacement between the input
voltage and the output voltage of a transmission line, thus
controlling the amount of active power that can flow in the line.
Guidance on necessary information
Beside the general information for transformers, the following
specific data are of interest (fig. 5.7-1):
• Rated MVA
The apparent power at rated voltage for which the phaseshifting transformer is designed.
• Rated voltage
The phase-to-phase voltage to which operating and
performance characteristics are referred to – at no-load.
• Rated phase angle
Phase angle achieved when the phase-shifting transformer
is operated under no-load condition, or if stated at full load, at
which power factor.
• Phase shift direction
In one or both directions. Changeover from and to under load
or no-load condition.
• Tap positions
Minimum and/or maximum number of tap positions.
• Impedance
Rated impedance at rated voltage, rated MVA and zero phase
shift connection as well as permissible change in impedance
with voltage and phase angle regulation.
• System short-circuit capability
When the system short-circuit level is critical to the design of
phase-shifting transformers, the maximum short-circuit fault
level shall be specified.
• BIL
Basic impulse level (BIL) of source, load and neutral terminals.
• Special design tests
Besides the standard lightning impulse tests at all terminals, it
has to be considered that the lightning impulse might occur
simultaneously at the source and the load terminal in case of
closed bypass breaker. If such a condition is likely to appear
during normal operation, a BIL test with source and load
terminals connected might be useful to ensure that the phaseshifting transformer can withstand the stresses of lightning
strokes in this situation.
• Special overload condition
The required overload condition and the kind of operation
(advance or retard phase angle) should be clearly stated.
Especially for the retard phase angle operation, the overload
requirements may greatly influence the cost of the phaseshifting transformer.
Fig. 5.7-1: Phase-shifting transformer
5
• Operation of phase-shifting transformer
Operation with other phase-shifting transformers in parallel or
series.
• Single or dual-tank design
In most cases, a dual-core design requires a dual-tank design
as well.
• Symmetric or non-symmetric type
Symmetric means that under a no-load condition the voltage
magnitude at the load side is equal to that of the source side.
For non-symmetric phase-shifting transformers, the
permissible variation in percent of rated voltage at maximum
phase angle must be stated.
• Quadrature or non-quadrature type
A quadrature-type phase-shifting transformer is a unit where
the boost voltage, which creates the phase shift between
source and load terminals, is perpendicular to the line voltage
on one terminal.
• Internal varistors
It has to be clarified whether internal metal oxide varistors are
allowed or not.
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269
Transformers
5.8 HVDC Transformers
HVDC transformers are key components of HVDC stations. HVDC
converter and inverter stations terminate long-distance DC
transmission lines or DC sea cables. This type of transformer
provides the interface between AC grids and high power rectifiers and are used to control the load flow over the DC transmission lines. These actors adapt the AC grid voltage to an adequate
level which is suitable for feeding the valve system of DC converter and inverter.
Design options
The design concept of HVDC transformers is mainly influenced
by the rated voltage, rated power and transportation requirements like dimensions, weight and mode of transportation.
Many large power HVDC converter station are located in rural
areas of low infrastructure. Frequently, special geometrical
profiles have to be fulfilled in order to move such transformers
by railway.
Typically, HVDC transformers are single phase units containing
2 winding limbs. This concept can include either 2 parallel valve
windings (two for delta or two for wye system, fig. 5.8-1) or two
different valve windings (one for delta and one for wye,
fig. 5.8‑2). In order to reduce the total transportation height
frequently the core assembly includes 2 return limbs. Due to
redundancy requirements in HVDC stations 3 phase units are
quite uncommon.
5
Fig. 5.8-1: Converter transformer for UHVDC bipolar transmission
system ± 800 kVDC, 6,400 MW; 2,071 km: single phase;
550 kVAC, 816 kVDC; 321 MVA; high pulse wye system
feeding
The valve windings are exposed to AC and DC dielectric stress
and therefore a special insulation assembly is necessary. Furthermore, special lead systems connecting the turrets and windings
have to be installed in order to withstand the DC voltage of
rectifier. Additionally, the load current contains harmonic components of considerable energy resulting in higher losses and
increased noise. Above all, special bushings are necessary for
the valve side to access upper and lower winding terminals of
each system from outside. Conclusively, two identical bushings
are installed for star or delta system.
For approving the proper design and quality of manufacturing
special applied DC and DC polarity reversal tests have to be
carried out. The test bay has to be equipped with DC test apparatus accordingly and needs to provide adequate geometry to
withstand the DC test voltage.
Technical items
In addition to the standard parameters of power transformers,
special performance requirements have to be known for the
design of HVDC transformers. These parameters are jointly
defined by designers of the HVDC station and transformer design
engineers in order to reach a cost-effective design for the entire
equipment.
Special parameters are:
• Test levels: DC applied, DC polarity reversal and long-time AC
defines the insulation assembly of the transformer
• Harmonic spectrum of the load current and phase relation
270
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Fig. 5.8-2: Converter transformer for HVDC bipolar transmission
system ± 500 kVDC; 2,500 MW: single phase; 420 kVAC;
515 kVDC; 397 MVA; wye system (left side of figure) and
delta system (right side of figure)
generate additional losses, which have to compensated by the
cooling circuit
• Voltage impedance impacting the dimensions of windings and
the total height of the transformer
• DC bias in load and current and transformer-neutral have to be
considered for no-load noise and no-load losses
• Derivative of the load current (di/dt) is a key parameter for the
on-load tap changer
• Overload requirements have to be considered for cooling
circuit and capacity of coolers
• Regulation range and number of steps influence the voltage
per turn which is a key design parameter
• Seismic requirements have to be considered for mechanical
strength of turrets, outlets and bushings.
Transformers
5.9 Distribution
Transformers
5.9.1 Liquid-Immersed Distribution
Transformers for European/US/
Canadian Standard
On the last transformation step from the power plant to the
consumer, distribution transformers (DT) provide the necessary
power for systems and buildings. Accordingly, their operation
must be reliable, efficient and, at the same time, silent.
Distribution transformers are used to convert electrical energy
of higher voltage, usually up to 36 kV, to a lower voltage,
usually 250 up to 435 V, with an identical frequency before and
after the transformation. Application of the product is mainly
within suburban areas, public supply authorities and industrial
customers.
Fig. 5.9-1: 1-phase DT, pole-mounted, Canada
5
Distribution transformers are fail-safe, economical and have a
long life expectancy. These fluid-immersed transformers can be
1-phase or 3-phase. During operation, the windings can be
exposed to high electrical stress by external overloads and high
mechanical stress by short circuits. They are made of copper or
aluminum. Low-voltage windings are made of strip or flat wire,
and the high-voltage windings are manufactured from round
wire or flat wire.
Three product classes – standard, special and renewable –
are available, as follows:
• Standard distribution transformers:
––1- or 3-phase, pole-mounted (fig. 5.9-1) or pad-mounted
(fig. 5.9-2), wound or stacked core technology distribution
transformer (≤ 2,500 kVA, Um ≤ 36 kV)
––Medium distribution transformer (> 2,500 ≤ 6,300 kVA,
Um ≤ 36 kV)
––Large distribution transformer
(> 6.3 – 30.0 MVA, Um ≤ 72.5 kV)
• Special distribution transformers:
––Special application: self-protected DT, regulating DT, lowemission DT or others (autotransformer, transformer for
converters, double-tier, multiwinding transformer, earthing
transformer)
––Environmental focus: amorphous core DT with significant
low no-load losses, DT with special low load-loss design,
low-emission DT in regard of noise and/or electromagnetic
field emissions, DT with natural or synthetic ester where
higher fire-resistance and/or biodegradability is required
• Renewable distribution transformers:
––Used in wind power plants, solar power plants or sea flow/
generator power plants.
Fig. 5.9-2: 3-phase DT, pad-mounted
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
271
Transformers
5.9 Distribution Transformers
Oil distribution transformer selection table – Technical data, dimensions and weights
Rated
power
Rated
medium
voltage
Impedance
voltage*
No-load
losses *
Load
losses*
Total
losses*
Sn
[kVA]
Um
[kV]
U2
[%]
PO
[W]
Pk 75
[W]
100
12
4
210
4
4
24
160
12
24
5
250
12
24
400
12
24
630
12
24
800
12
24
272
Sound
power
level*
Total
weight*
Length
Width
Height
PO +
Pk 75
[W]
Sound
press.
level
1 m*
LPA
[dB]
LPA
[dB]
GGES
[kg]
A1
[mm]
B1
[mm]
H1
[mm]
Distance
between
wheel
centers
E
[mm]
1,750
1,960
34
49
640
1,050
800
1,350
520
210
1,475
1,685
34
49
650
1,000
800
1,350
520
145
1,475
1,620
33
41
625
950
750
1,400
520
4
210
1,750
1,960
34
49
640
1,050
800
1,350
520
4
210
1,475
1,685
34
49
650
1,000
800
1,350
520
4
145
1,475
1,620
33
41
625
950
750
1,400
520
4
300
2,350
2,650
36
52
740
1,100
800
1,350
520
4
300
2,000
2,300
36
52
810
1,050
875
1,400
520
4
210
2,000
2,210
34
44
750
1,100
825
1,450
520
4
300
2,350
2,650
36
52
740
1,100
800
1,350
520
4
300
2,000
2,300
36
52
810
1,050
875
1,400
520
4
210
2,000
2,210
34
44
750
1,100
825
1,450
520
4
425
3,250
3,675
39
55
980
1,150
850
1,450
520
4
425
2,750
3,175
39
55
1100
1,150
1,000
1,500
520
4
300
2,750
3,050
37
47
1050
1,150
850
1,600
520
4
425
3,250
3,675
39
55
980
1,150
850
1,450
520
4
425
2,750
3,175
39
55
1100
1,150
1,000
1,500
520
4
300
2,750
3,050
37
47
1050
1,150
850
1,600
520
4
610
4,600
5,210
41
58
1,230
1,200
900
1,550
670
4
610
3,850
4,460
41
58
1,450
1,350
1,050
1,650
670
4
430
3,850
4,280
39
49
1,400
1,250
950
1,650
670
4
610
4,600
5,210
41
58
1,230
1,200
900
1,550
670
4
610
3,850
4,460
41
58
1,450
1,350
1,050
1,650
670
4
430
3,850
4,280
39
49
1,400
1,250
950
1,650
670
4
860
6,500
7,360
43
60
1,660
1,550
950
1,700
670
4
860
5,400
6,260
43
60
1,950
1,550
1,100
1,700
670
4
600
5,400
6,000
41
52
2,050
1,450
1,100
1,800
670
6
800
6,750
7,550
43
60
1,670
1,600
1,000
1,650
670
6
800
5,600
6,400
43
60
2,050
1,650
1,100
1,700
670
6
560
5,600
6,160
41
52
2,100
1,400
1,100
1,775
670
4
860
6,500
7,360
43
60
1,660
1,550
950
1,700
670
4
860
5,400
6,260
43
60
1,950
1,550
1,100
1,700
670
4
600
5,400
6,000
41
52
2,050
1,450
1,100
1,800
670
6
800
6,750
7,550
43
60
1,670
1,600
1,000
1,650
670
6
800
5,600
6,400
43
60
2,050
1,650
1,100
1,700
670
6
560
5,600
6,160
41
52
2,100
1,400
1,100
1,775
670
6
930
8,400
9,330
45
62
2,070
1,650
1,050
1,650
670
6
930
7,000
7,930
45
62
2,400
1,700
1,200
1,750
670
6
650
7,000
7,650
43
53
2,600
1,800
1,125
1,825
670
6
930
8,400
9330
45
62
2,070
1,650
1,050
1,650
670
6
930
7,000
7930
45
62
2,400
1,700
1,200
1,750
670
6
650
7,000
7,650
43
53
2,600
1,800
1,125
1,825
670
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Transformers
5.9 Distribution Transformers
Oil distribution transformer selection table – Technical data, dimension and weights
Rated
power
Rated
medium
voltage
Impedance
voltage*
No-load
losses *
Load
losses*
Total
losses*
Sn
[kVA]
Um
[kV]
U2
[%]
PO
[W]
Pk 75
[W]
1,000
12
6
1,100
6
1,100
24
1,250
12
24
1,600
12
24
2,000
12
24
2,500
12
24
Sound
power
level*
Total
weight*
Length
Width
Height
PO +
Pk 75
[W]
Sound
press.
level
1 m*
LPA
[dB]
LPA
[dB]
GGES
[kg]
A1
[mm]
B1
[mm]
H1
[mm]
Distance
between
wheel
centers
E
[mm]
10,500
11,600
45
63
2,390
1,800
1,150
1850
820
9,000
10,100
45
63
2,800
2,050
1,400
1,900
820
6
770
9,000
9,770
43
55
2,900
1,850
1,150
2,050
820
6
1,100
10,500
11,600
45
63
2,390
1,800
1,150
1,850
820
6
1,100
9,000
10,100
45
63
2,800
2,050
1,400
1,900
820
6
770
9,000
9,770
43
55
2,900
1,850
1,150
2,050
820
6
1,350
13,500
14,850
46
64
3,125
1,850
1,160
1,850
820
6
1,350
11,000
12,350
46
64
2,950
1,600
1,050
1,650
820
6
950
11,000
11,950
44
56
3,150
1,600
1,140
1,800
820
6
1,350
13,500
14,850
46
64
3,125
1,850
1,160
1,850
820
6
1,350
11,000
12,350
46
64
2,950
1,600
1,050
1,650
820
6
950
11,000
11,950
44
56
3,150
1,600
1,140
1,800
820
6
1,700
17,000
18,700
47
66
3,570
1,870
1,150
1,950
820
6
1,700
14,000
15,700
47
66
3,980
1,600
1,130
2,120
820
6
1,200
14,000
15,200
45
58
3,660
1,770
1,010
1,980
820
6
1,700
17,000
18,700
47
66
3,570
1,870
1,150
1,950
820
6
1,700
14,000
15,700
47
66
3,980
1,600
1,130
2,120
820
6
1,200
14,000
15,200
45
58
3,660
1,770
1,010
1,980
820
6
2,100
21,000
23,100
48
68
4,480
2,110
1,380
1,900
1,070
6
2,100
18,000
20,100
48
68
4,500
1,830
1,380
2,200
1,070
6
1,450
18,000
19,450
46
60
4,200
1,920
1,380
2,150
1,070
6
2,100
21,000
23,100
48
68
4,480
2,110
1,380
1,900
1,070
6
2,100
18,000
20,100
48
68
4,500
1,830
1,380
2,200
1,070
6
1,450
18,000
19,450
46
60
4,200
1,920
1,380
2,150
1,070
6
2,500
26,500
29,000
51
71
5,220
2,160
1,390
2,100
1,070
6
2,500
22,000
24,500
51
71
5,300
1,900
1,380
2,300
1,070
6
1,750
22,000
23,750
46
63
5,200
1,980
1,380
2,250
1,070
6
2,500
26,500
29,000
51
71
5,220
2,160
1,390
2,100
1,070
6
2,500
22,000
24,500
51
71
5,300
1,900
1,380
2,300
1,070
6
1,750
22,000
23,750
46
63
5,200
1,980
1,380
2,250
1,070
5
Dimensions and weights are approximate values and valid for 400 V on the secondary side, vector-group is Dyn 5.
Rated power figures in parentheses are not standardized.
* Remarks: The guaranteed values are subject to tolerance according to IEC standards as follows:
• Impedance voltage: ± 10%
• No-load losses: + 15%
• Load losses: + 15%
• Total losses (No-load losses + Load losses): +10%
• Sound pressure level: + 3 dB (A)
• Sound power level: + 3 dB(A)
Rated power > 2500 kVA to 12 MVA upon request.
Loss values according to new EU Directive:
Rated power ≤ 1000 kVA —> A0 / Ck
Rated power > 1000 kVA —> A0 / Bk
Table 5.9-1: Oil distribution transformer selection table – Technical data, dimensions and weights
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
273
Transformers
5.9 Distribution Transformers
5.9.2 Voltage Regulators
Siemens invented the voltage regulator in 1932 and pioneered
its use in the United States. Voltage Regulators are tapped step
autotransformers used to ensure that a desired level of voltage
is maintained at all times. A voltage regulator comprises a
tapped autotransformer and a tap changer. The standard
voltage regulator provides ± 10 % adjustment in thirty-two
0.625 % steps. Voltage Regulators with ± 15 % and ± 20 %
regulation are available for some designs.
Voltage regulators are liquid-immersed and can be 1-phase or
3-phase. They may be self-cooled or forced air-cooled. Available
at 50 or 60 Hz and with 55 or 65 °C temperature rise, they can
be used in any electrical system to improve voltage quality.
Voltage regulator ratings are based on the percent of regulation
(i.e., 10 %). For example, a set of three 1-phase 333 kVA regulators would be used with a 10 MVA transformer (e.g., 10 MVA •
0.10/3 = 333 kVA). 1-phase voltage regulators are available in
ratings ranging from 2.5 kV to 19.9 kV and from 38.1 kVA to
889 kVA (fig. 5.9-3). 3-phase voltage regulators are available at
13.2 kV or 34.5 kV and from 500 kVA to 4,000 kVA.
5
Auxiliary PT
Operation at different voltages.
Testing
All voltage regulators shall be tested in accordance with the
latest ANSI C57.15 standards.
Standard tests include:
• Resistance measurements of all windings
• Ratio tests on all tap locations
• Polarity test
• No-load loss at rated voltage and rated frequency
• Excitation current at rated voltage and rated frequency
• Impedance and load loss at rated current and rated frequency
• Applied potential
• Induced potential
• Insulation power factor test
• Impulse test
• Insulation resistance.
Voltage regulators can be partially or completely untanked for
inspection and maintenance without disconnecting any internal
electrical or mechanical connections. After the unit is untanked,
it is possible to operate the voltage regulator mechanism and
test the control panel from an external voltage source without
any reconnections between the control and the regulator.
Standard external accessories
The standard accessories are as follows:
• External metal-oxide varistor (MOV) bypass arrester
• Cover-mounted terminal block with a removable gasketed
cover. It allows easy potential transformer reconnections
for operation at different voltages
• Oil sampling valve
• Two laser-etched nameplates
• External oil sight gauge that indicates oil level at 25 °C
ambient air temperature and oil color
• External position indicator that shows the tap changer position
• Mounting bosses for the addition of lightning arresters to the
source (S), load (L) and source-load (SL) bushings. They shall
be fully welded around their circumference.
Accessories and options
Remote mounting kit
Extra-long control cable shall be provided for remote mounting
of the control cabinet at the base of the pole.
Sub-bases
To raise the voltage regulator to meet safe operating clearances
from the ground to the lowest live part.
274
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Fig. 5.9-3: 1-phase voltage
regulator, JFR
Transformers
5.9 Distribution Transformers
5.9.3 GEAFOL Cast-Resin Transformers
GEAFOL transformers have been in successful service since
1965. Many licenses have been granted to major manufacturers
throughout the world since then. Over 100,000 units have
proven themselves in power distribution or converter operation
all around the globe.
Advantages and applications
GEAFOL distribution and power transformers in ratings from 100
to approximately 50,000 kVA and lightning impulse (LI) values
up to 250 kV are full substitutes for liquid-immersed transformers with comparable electrical and mechanical data. They
are designed for indoor installation close to their point of use at
the center of the major load consumers. The exclusive use of
flame-retardant insulating materials frees these transformers
from all restrictions that apply to oil-filled electrical equipment,
such as the need for oil collecting pits, fire walls, fire extinguishing equipment. For outdoor use, specially designed sheet
metal enclosures are available.
GEAFOL transformers are installed wherever oil-filled units
cannot be used or where use of liquid-immersed transformers
would require major constructive efforts such as inside buildings, in tunnels, on ships, cranes and offshore platforms, inside
wind turbines, in groundwater catchment areas and in food
processing plants. For outdoor use, specially designed sheet
metal enclosures are available.
Often these transformers are combined with their primary and
secondary switchgear and distribution boards into compact
substations that are installed directly at their point of use.
When used as static converter transformers for variable speed
drives, they can be installed together with the converters at the
drive location. This reduces construction requirements, cable
costs, transmission losses and installation costs.
GEAFOL transformers are fully LI-rated. Their noise levels are
comparable to oil-filled transformers. Taking into account the
indirect cost reductions just mentioned, they are also mostly
5
Three-leg core
Made of grain-oriented,
low-loss electrolaminations
insulated on both sides
LV terminals
Normal arrangement:
Top, rear
Special version:
Bottom, available on
request at extra charge
LV winding
Made of aluminum strip.
Turns firmly glued together
by means of preimpregnated
fibres (Prepreg)
HV terminals
Variable arrangements,
for optimal station design.
HV tapping links for
adjustment to system
conditions, reconnectable
in de-energized state*
Temperature monitoring
By PTC or Pt 100 thermistor
detectors in the LV winding
Paint finish
on steel parts
Two-component varnish
RAL 5009 (for aggressive
environments or high
humidity several layers)
Ambient class E2
Climatic category C2
(If the transformer is installed
outdoors, degree of protection
IP23 must be assured)
Fire class F1
* on-load tap changers on request
HV winding
Consisting of vacuum-potted
single foil-type aluminum coils.
See enlarged detail
in fig. 5.9-5
Insulation
Mixture of epoxy resin
and quartz powder
makes the transformer
practically maintenancefree, moisture-proof,
tropicalized, flame-resistant
and self-extinguishing
Resilient spacers
To insulate core and
windings from mechanical
vibrations, resulting in low
noise emissions
Clamping frame and truck
Rollers can be swung
around for lengthways
or sideways travel
Fig. 5.9-4: GEAFOL cast-resin dry-type transfomer properties
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
275
Transformers
5.9 Distribution Transformers
cost-competitive. By virtue of their design, GEAFOL transformers
are practically maintenance-free.
Standards and regulations
GEAFOL cast-resin dry-type transformers comply with
VDE 0532-76-11, IEC 60076-11/DIN EN 60076-11 and
DIN EN 50541-1. On request other standards, such as GOST,
SABS or CSA/ANSI/IEEE, can also be taken into account.
Characteristic properties (fig. 5.9-4)
HV winding
The high-voltage windings are wound from aluminum foil
interleaved with high-grade insulating foils. The assembled and
connected individual coils are placed in a heated mold and are
potted in a vacuum furnace with a mixture of pure silica (quartz
sand) and specially blended epoxy resins. The only connections
to the outside are casted brass nuts that are internally
bonded to the aluminum winding connections.
The external delta connections are made of
insulated copper or aluminum connectors to
guarantee an optimal installation design. The resulting highvoltage windings are fire-resistant, moisture-proof and corrosion-proof, and they show excellent aging properties under all
operating conditions.
5
U
The foil windings combine a simple winding technique with a
high degree of electrical safety. The insulation is subjected to
less electrical stress than in other types of windings. In a conventional round-wire winding, the interturn voltages can add up to
twice the interlayer voltage. In a foil winding, it never exceeds
the voltage per turn, because a layer consists of only one
winding turn. This results in high AC voltage and impulse
voltage withstand capacity (fig. 5.9-5).
One reason for using aluminum is because the thermal expansion
coefficients of aluminum and cast resin are so similar that thermal
stresses resulting from load changes are kept to a minimum.
LV winding
The standard low-voltage winding with its considerably reduced
dielectric stresses is wound from single aluminum sheets with
epoxy-resin preimpregnated fiberglass fabrics (Pregreg).
The assembled coils are then oven-cured to form uniformly
bonded solid cylinders that are impervious to moisture. Through
the single-sheet winding design, excellent dynamic stability
under short-circuit conditions is achieved. Connections are
submerged arc-welded to the aluminum sheets and are extended
either as aluminum or copper bars to the secondary terminals.
Fire safety
GEAFOL transformers use only flame-retardant and self-­
extinguishing materials in their construction. No additional
substances, such as aluminum oxide trihydrate, which could
negatively influence the mechanical stability of the cast-resin
molding material, are used. Internal arcing from electrical faults
276
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Round-wire winding
The interturn voltages can add up
to twice the interlayer voltage
U
2468
2
3
4
5
6
7
8
1
2
3
4
5
6
7
1357
Foil winding
The interlayer voltage is equal
to the interturn voltage
Fig. 5.9-5: High-voltage encapsulated winding design of
GEAFOL cast-resin transformer and voltage stress of a
conventional round-wire winding (above) and the foil
winding (below)
Transformers
5.9 Distribution Transformers
and externally applied flames do not cause the transformers to
burst or burn. After the source of ignition is removed, the transformer is self-extinguishing. This design has been approved by
fire officials in many countries for installation in populated
buildings and other structures. The environmental safety of the
combustion residues has been proven in many tests (fig. 5.9-6).
Categorization of cast-resin transformers
Dry-type transformers have to be classified under the categories
listed below:
• Environmental category
• Climatic category
• Fire category.
These categories have to be shown on the rating plate of each
dry-type transformer.
The properties laid down in the standards for ratings within the
category relating to environment (humidity), climate and fire
behavior have to be demonstrated by means of tests.
5
Fig. 5.9-6: Flammability test of cast-resin transformer
These tests are described for the environmental category
(code numbers E0, E1 and E2) and for the climatic category
(code numbers C1 and C2) in IEC 60076-11. According to this
standard, the tests are to be carried out on complete trans­
formers. The tests of fire behavior (fire category code numbers
F0 and F1) are limited to tests on a duplicate of a complete
transformer that consists of a core leg, a low-voltage winding
and a high-voltage winding.
GEAFOL cast-resin transformers meet the requirements of the
highest defined protection classes:
• Environmental category E2 (optionally E3 according
to IEC 60076-16 wind turbines application)
• Climatic category C2 *1)
• Fire category F1
Insulation class and temperature rise
The high-voltage winding and the low-voltage winding utilize
class F insulating materials with a mean temperature rise of
100 K (standard design).
Overload capability
GEAFOL transformers can be overloaded permanently up to 50 %
(with a corresponding increase in impedance voltage and load
losses) if additional radial cooling fans are installed (dimensions
can increase by approximately 100 mm in length and width.)
(fig. 5.9-7). Short-time overloads are uncritical as long as the
maximum winding temperatures are not exceeded for extended
periods of time (depending on initial load and ambient air
temperature).
Temperature monitoring
Each GEAFOL transformer is fitted with three temperature
sensors installed in the LV winding, and a solid-state tripping
device with relay output. The PTC thermistors used for sensing
are selected for the applicable maximum hot-spot winding
temperature.
Fig. 5.9-7: Radial cooling fans on GEAFOL transformer for AF cooling
Um (kV)
LI (kV) *2)
AC (kV) *2)
1.1
–
3
12
75
28
24
95/125
50
36
145 /170
70
*2) other levels upon request
Table 5.9-2: Standard insulation levels of GEAFOL
*1) On request designs for ambient air temperature below –25
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
277
Transformers
5.9 Distribution Transformers
°C are available
Additional sets of sensors can be installed, e.g. for fan control
purposes. Alternatively, Pt100 sensors are available. For operating voltages of the LV winding of 3.6 kV and higher, special
temperature measuring equipment can be provided.
Auxiliary wiring is run in a protective conduit and terminated in
a central LV terminal box (optional). Each wire and terminal is
identified, and a wiring diagram is permanently attached to the
inside cover of this terminal box.
Installation and enclosures
Indoor installation in electrical operating rooms or in various
sheet metal enclosures is the preferred method of installation.
The transformers need to be protected only against access to the
terminals or the winding surfaces, against direct sunlight and
against water. Unless sufficient ventilation is provided by the
installation location or the enclosure, forced-air cooling must be
specified or provided by others.
Instead of the standard open terminals, plug-type elbow connectors can be supplied for the high-voltage side with LI ratings
up to 170 kV. Primary cables are usually fed to the transformer
from trenches below but can also be connected from above
(fig. 5.9-8).
5
Secondary connections can be made by multiple insulated
cables, or by connecting bars from either below or above.
Terminals are made of aluminum (copper upon request).
A variety of indoor and outdoor enclosures in different protection classes are available for the transformers alone, or for
indoor compact substations in conjunction with high-voltage
and low-voltage switchgear panels. PEHLA-tested housings are
also available (fig. 5.9-9).
Cost-effective recycling
The oldest of the GEAFOL cast-resin transformers that entered
production in the mid-1960s are approaching the end of their
service life. Much experience has been gathered over the years
with the processing of faulty or damaged coils from such transformers. The metal materials and resin used in GEAFOL cast-resin
transformers, that is, approximately 95 % of their total mass, can
Fig. 5.9-8: GEAFOL transformer with plug-type cable connections
278
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Fig. 5.9-9: GEAFOL transformer in protective housing to IP20/40
be recyled. The process used is non-polluting. Given the value of
secondary raw materials, the procedure is often cost-effective,
even with the small amounts currently being processed.
The GEAFOL Basic – a true GEAFOL and more
The GEAFOL Basic is based on almost 50 years of proven GEAFOL
technology and quality, but it offers numerous innovations that
has allowed Siemens to provide it with several very special
characteristics. For example, the GEAFOL Basic distribution
transformer with a maximum rated power of 3.15 MVA and a
maximum medium voltage of 36 kV is almost ten percent lighter
than a comparable model from the proven GEAFOL series. And
this “slimming down” also positively affects the dimensions. This
could be achieved by a considerably improved heat dissipation
because of the new, patented design.
Of course all GEAFOL Basic distribution transformers meet the
specifications of VDE 0532-76-11/IEC 60076-11/DIN EN 60076-11
and DIN EN 50541-1. They meet the highest requirements for safe
installation in residential and work environments with Climatic
Class C2, Environmental Class E2 and Fire Classification F1. With
fewer horizontal surfaces, less dust is deposited, which leads to a
further reduction in the already minimal time and effort needed
for maintenance and also increases operational reliability.
Optimum compromise
The GEAFOL Basic distribution transformer represents an
optimum compromise between performance, safety and small
dimensions. In addition, the high degree of standardization
ensures the best possible cost-benefit ratio. Thanks to their
compact shape and comprehensive safety certification, GEAFOL
Basic distribution transformers can be used in almost every
environment.
Transformers
5.9 Distribution Transformers
5
4
1
6
2
9
3
5
8
7
A new design for your success –
the reliable, space-saving GEAFOL Basic
1 Three-limb core made of
grain-oriented, low-loss electric
sheet steel insulated on both sides
2 Low-voltage winding made
of aluminum strip; turns are permanently bonded with insulating sheet
3 High-voltage winding made
of individual aluminum coils using
foil technology and vacuum casting
4 Low-voltage connectors (facing up)
5 Lifting eyes integrated into the
upper core frame for simple transport
6 Delta connection tubes
with HV terminals
7 Clamping frame and truck
Convertible rollers for longitudinal
and transverse travel
8 Insulation made of an epoxy
resin/quartz powder mixture
makes the transformer extensively
maintenance-free, moisture-proof
and suitable for the tropics,
fire-resistant and self-extinguishing
9 High-voltage tappings ±2 x 2.5 %
(on the high-voltage terminal side)
to adapt to the respective network
conditions; reconnectable off load
Temperature monitoring with PTC thermistor
detector in limb V of the low-voltage winding
(in all three phases on request)
Painting of steel parts
high-build coating, RAL 5009 on request:
two-component coating (for particularly
aggressive environments)
Structure made of individual components,
for example, windings can be individually
assembled and replaced on site
Climatic Class C2
Environmental Class E2
Fire Classification F1
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
279
Transformers
5.9 Distribution Transformers
5.9.4 GEAFOL Special Transformers
5
GEAFOL cast-resin transformers with oil-free
on-load tap changers (OLTC)
The voltage-regulating cast-resin transformers connected on the
load side of the medium-voltage power supply system feed the
plant-side distribution transformers. The on-load tap changer
controlled transformers used in these medium-voltage systems
need to have appropriately high ratings.
under control. However, the maximum control range utilizes
only 20 % of the rated voltage.
Siemens offers suitable transformers with OLTC in its GEAFOL
design (fig. 5.9-10), which has proved successful over many
years and is available in ratings of up to 50 MVA. The range of
rated voltage extends to 36 kV, and the maximum impulse
voltage is 200 kV. The main applications of this type of transformer are in modern industrial plants, hospitals, office and
apartment blocks and shopping centers.
The effects of such conversion equipment on transformers and
additional construction requirements are as follows:
• Increased load by harmonic currents
• Balancing of phase currents in multiple winding systems
(e.g., 12-pulse systems)
• Overload capability
• Types for 12-pulse systems, if required
Linking 1-pole tap changer modules together by means of
insulating shafts produces a 3-pole on-load tap changer for
regulating the output voltage of 3-phase GEAFOL transformers.
In its nine operating positions, this type of tap changer has a
rated current of 500 A and a rated voltage of 900 V per step.
This allows voltage fluctuations of up to 7,200 V to be kept
Siemens supplies oil-filled converter transformers of all ratings
and configurations known today, and dry-type cast-resin converter transformers up to 50 MVA and 250 kV LI (fig. 5.9-11).
Transformers for static converters
These are special cast-resin power transformers that are
designed for the special demands of thyristor converter or diode
rectifier operation.
To define and quote for such transformers, it is necessary to
know considerable details on the converter to be supplied and
Fig. 5.9-10: 16/22-MVA GEAFOL cast-resin transformer with oil-free on-load tap changer
280
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
Transformers
5.9 Distribution Transformers
on the existing harmonics. These transformers are almost exclusively inquired together with the respective drive or rectifier
system and are always custom-engineered for the given application.
Neutral earthing transformers
When a neutral earthing reactor or earth-fault neutralizer is
required in a 3-phase system and no suitable neutral is available,
a neutral earthing must be provided by using a neutral earthing
transformer.
Neutral earthing transformers are available for continuous
operation or short-time operation. The zero impedance is
normally low. The standard vector group is wye/delta. Some
other vector groups are also possible.
Neutral earthing transformers can be built by Siemens in all
common power ratings.
Fig. 5.9-11: 23-MVA GEAFOL cast-resin transformer 10 kV/Dd0Dy11
Transformers for silicon-reactor power feeding
These special transformers are an important component in
plants for producing polycrystalline silicon, which is needed
particularly by the solar industry for the manufacture of
­collectors.
What is special about these transformers is that they have to
­provide five or more secondary voltages for the voltage supply
of the special thyristor controllers. The load is highly unbalanced
and is subject to harmonics that are generated by the converters. Special GEAFOL cast-resin transformers with open
secondary circuit have been developed for this purpose. The
rated power can be up to round about 10 MVA, and the current
can exceed an intensity of 5,000 amps depending on the reactor
type and operating mode. Depending on the reactor control
system two-winding or multi-winding transformers will be used
(fig. 5.9-12).
GEAFOL cast-resin transformers in protective housings with
an air-water cooling system
The GEAFOL cast-resin transformers are designed using the
special AFWF cooling system. With this system, the thermal
losses generated in the windings and in the iron core are not
released directly into the environment as hot air, but are collected in a largely airtight protective housing around and above
the transformer, and then compressed using fans via an airwater heat exchanger and released from there into an external
cold water circulation system. The re-cooled, cold air is then
distributed to all phases using a system of air guide plates, and
is fed back to cool the windings from below. A double-pipe
construction system for the coolers with leak monitoring ensures
additional operational safety. The housing-transformer system is
widely used on ships, and is available up to the highest ratings.
5
Fig. 5.9-12: 4771 kVA GEAFOL converter transformer with
5 secondary tappings 10/0.33 – 2.4 kV
Fig. 5.9-13: GEAFOL cast-resin transformers in protective housing
with an air-water cooling system
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
281
Transformers
5
160
250
(315) 4)
1)
LWA
W
W
dB
440
1,850
59
4GB5044-3CY05-0AA2
a2)
b2)
h2)
approx.
kg
mm
mm
mm
600
1,210
670
840
10
0.4
28/75
3/–
4
320
1,850
51
4GB5044-3GY05-0AA2
720
1,230
675
845
10
0.4
28/v75
3/–
6
360
2,000
59
4GB5044-3DY05-0AA2
570
1,200
680
805
10
0.4
28/75
3/–
6
290
2,000
51
4GB5044-3HY05-0AA2
720
1,280
685
890
20
0.4
50/95
3/–
4
600
1,750
59
4GB5064-3CY05-0AA2
620
1,220
740
925
20
0.4
50/95
3/–
4
400
1,750
51
4GB5064-3GY05-0AA2
740
1,260
745
945
20
0.4
50/95
3/–
6
460
2,050
59
4GB5064-3DY05-0AA2
610
1,250
750
915
20
0.4
50/95
3/–
6
340
2,050
51
4GB5064-3HY05-0AA2
730
1,280
750
940
20
0.4
50/125
3/–
6
460
2,050
59
4GB5067-3DY05-0AA2
720
1,260
750
1,145
10
0.4
28/75
3/–
4
610
2,600
62
4GB5244-3CY05-0AA2
820
1,270
690
1,025
10
0.4
28/75
3/–
4
440
2,600
54
4GB5244-3GY05-0AA2
960
1,260
685
1,100
10
0.4
28/75
3/–
6
500
2,750
62
4GB5244-3DY05-0AA2
690
1,220
685
990
10
0.4
28/75
3/–
6
400
2,750
54
4GB5244-3HY05-0AA2
850
1,290
695
1,010
20
0.4
50/95
3/–
4
870
2,500
62
4GB5264-3CY05-0AA2
790
1,280
745
1,060
20
0.4
50/95
3/–
4
580
2,500
54
4GB5264-3GY05-0AA2
920
1,320
755
1,060
20
0.4
50/95
3/–
6
650
2,700
62
4GB5264-3DY05-0AA2
780
1,320
760
1,040
20
0.4
50/95
3/–
6
480
2,700
54
4GB5264-3HY05-0AA2
860
1,350
765
1,050
20
0.4
50/125
3/–
6
650
2,900
62
4GB5267-3DY05-0AA2
870
1,310
720
1,200
10
0.4
28/75
3/–
4
820
3,200
65
4GB5444-3CY05-0AA2
1,010
1,330
700
1,055
10
0.4
28/75
3/–
4
600
3,200
57
4GB5444-3GY05-0AA2
1,250
1,340
700
1,190
10
0.4
28/75
3/–
6
700
3,300
65
4GB5444-3DY05-0AA2
960
1,340
705
1,055
10
0.4
28/75
3/–
6
560
3,300
57
4GB5444-3HY05-0AA2
1,130
1,390
715
1,070
20
0.4
50/95
3/–
4
1,100
3,200
65
4GB5464-3CY05-0AA2
1,070
1,370
730
1,115
20
0.4
50/95
3/–
4
800
3,300
57
4GB5464-3GY05-0AA2
1,230
1,420
740
1,130
20
0.4
50/95
3/–
6
880
3,400
65
4GB5464-3DY05-0AA2
1,020
1,390
740
1,105
20
0.4
50/95
3/–
6
650
3,400
57
4GB5464-3HY05-0AA2
1,190
1,430
745
1,125
20
0.4
50/125
3/–
6
880
3,800
65
4GB5467-3DY05-0AA2
1,070
1,390
740
1,200
30
0.4
70/145
3/–
6
1,280
4,000
67
4GB5475-3DY05-0AA2
1,190
1,450
825
1,365
10
0.4
28/75
3/–
4
980
3,500
67
4GB5544-3CY05-0AA2
1,120
1,340
820
1,130
10
0.4
28/75
3/–
4
730
3,500
59
4GB5544-3GY05-0AA2
1,400
1,400
820
1,195
10
0.4
28/75
3/–
6
850
3,900
67
4GB5544-3DY05-0AA2
1,130
1,360
820
1,160
10
0.4
28/75
3/–
6
670
3,700
59
4GB5544-3HY05-0AA2
1,260
1,400
820
1,170
20
0.4
50/95
3/–
4
1,250
3,500
67
4GB5564-3CY05-0AA2
1,370
1,490
835
1,145
20
0.4
50/95
3/–
4
930
3,500
59
4GB5564-3GY05-0AA2
1,590
1,520
835
1,205
20
0.4
50/95
3/–
6
1,000
3,800
67
4GB5564-3DY05-0AA2
1,350
1,490
835
1,180
20
0.4
50/95
3/–
6
780
3,800
59
4GB5564-3HY05-0AA2
1,450
1,520
840
1,205
20
0.4
50/125
3/–
6
1,000
4,200
67
4GB5567-3DY05-0AA2
1,430
1,520
840
1,235
30
0.4
70/145
3/–
6
1,450
4,700
69
4GB5575-3DY05-0AA2
1,460
1,510
915
1,445
pplies to Ur HV:
A
10 to 12 kV
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
Indication of 0.4 kV applies to
the voltage range of 0.4–0.45 kV
4) Ratings in brackets are not standardized
3)
Table 5.9-3: GEAFOL cast-resin transformers 100 to 16,000 kVA
282
Height
Pk120
Width
Po
Length
4
uzr
Order No.
Total weight
3/–
Noise level
28/75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
100
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Transformers
(500) 4)
630
800
1)
LWA
W
W
dB
1,150
4,400
68
4GB5644-3CY05-0AA2
Height
Pk120
Width
Po
Length
4
uzr
Order No.
Total weight
3/–
Noise level
28/75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
400
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
1,290
1,370
820
1,230
10
0.4
28/75
3/–
4
880
4,400
60
4GB5644-3GY05-0AA2
1,500
1,390
820
1,330
10
0.4
28/75
3/–
6
1,000
4,900
68
4GB5644-3DY05-0AA2
1,230
1,400
820
1,215
10
0.4
28/75
3/–
6
800
4,900
60
4GB5644-3HY05-0AA2
1,390
1,430
820
1,230
20
0.4
50/95
3/–
4
1,450
3,800
68
4GB5664-3CY05-0AA2
1,470
1,460
830
1,285
20
0.4
50/95
3/–
4
1,100
3,800
60
4GB5664-3GY05-0AA2
1,710
1,520
835
1,305
20
0.4
50/95
3/–
6
1,200
4,300
68
4GB5664-3DY05-0AA2
1,380
1,490
835
1,260
20
0.4
50/95
3/–
6
940
4,300
60
4GB5664-3HY05-0AA2
1,460
1,500
840
1,260
20
0.4
50/125
3/–
6
1,200
4,700
68
4GB5667-3DY05-0AA2
1,530
1,540
845
1,310
30
0.4
70/145
3/–
6
1,650
5,500
69
4GB5675-3DY05-0AA2
1,590
1,560
925
1,500
10
0.4
28/75
3/–
4
1,300
5,900
69
4GB5744-3CY05-0AA0
1,490
1,410
820
1,315
10
0.4
28/75
3/–
4
1,000
5,300
61
4GB5744-3GY05-0AA0
1,620
1,420
820
1,340
10
0.4
28/75
3/–
6
1,200
6,400
69
4GB5744-3DY05-0AA0
1,420
1,450
820
1,245
10
0.4
28/75
3/–
6
950
6,400
61
4GB5744-3HY05-0AA0
1,540
1,490
820
1,265
20
0.4
50/95
3/–
4
1,700
4,900
69
4GB5764-3CY05-0AA0
1,550
1,460
840
1,365
20
0.4
50/95
3/–
4
1,300
4,900
61
4GB5764-3GY05-0AA0
1,700
1,490
845
1,370
20
0.4
50/95
3/–
6
1,400
5,100
69
4GB5764-3DY05-0AA0
1,500
1,530
855
1,275
20
0.4
50/95
3/–
6
1,100
5,100
61
4GB5764-3HY05-0AA0
1,670
1,560
860
1,290
20
0.4
50/125
3/–
6
1,400
6,300
69
4GB5767-3DY05-0AA0
1,610
1,540
855
1,355
30
0.4
70/145
3/–
6
1,900
6,000
70
4GB5775-3DY05-0AA0
1,810
1,560
925
1,615
30
0.4
70/170
3/–
6
2,600
6,200
79
4GB5780-3DY05-0AA0
2,110
1,710
1,005
1,590
10
0.4
28/75
3/–
4
1,500
7,300
70
4GB5844-3CY05-0AA0
1,670
1,410
820
1,485
1,485
10
0.4
28/75
3/–
4
1,150
7,300
62
4GB5844-3GY05-0AA0
1,840
1,440
820
10
0.4
28/75
3/–
6
1,370
7,500
70
4GB5844-3DY05-0AA0
1,710
1,520
830
1,305
10
0.4
28/75
3/–
6
1,100
7,500
62
4GB5844-3HY05-0AA0
1,850
1,560
835
1,330
20
0.4
50/95
3/–
4
2,000
6,900
70
4GB5864-3CY05-0AA0
1,790
1,470
840
1,530
20
0.4
50/95
3/–
4
1,600
6,900
62
4GB5864-3GY05-0AA0
1,930
1,520
845
1,565
20
0.4
50/95
3/–
6
1,650
6,800
70
4GB5864-3DY05-0AA0
1,750
1,560
860
1,365
20
0.4
50/95
3/–
6
1,250
6,800
62
4GB5864-3HY05-0AA0
1,900
1,600
865
1,385
20
0.4
50/125
3/–
6
1,650
7,000
70
4GB5867-3DY05-0AA0
1,830
1,590
865
1,395
30
0.4
70/145
3/–
6
2,200
6,600
71
4GB5875-3DY05-0AA0
2,090
1,620
940
1,640
10
0.4
28/75
3/–
4
1,800
7,800
72
4GB5944-3CY05-0AA0
1,970
1,500
820
1,535
10
0.4
28/75
3/–
4
1,400
7,800
64
4GB5944-3GY05-0AA0
2,210
1,530
825
1,535
10
0.4
28/75
3/–
6
1,700
8,300
72
4GB5944-3DY05-0AA0
2,020
1,590
840
1,395
10
0.4
28/75
3/–
6
1,300
8,300
64
4GB5944-3HY05-0AA0
2,230
1,620
845
1,395
20
0.4
50/95
3/–
4
2,400
8,500
72
4GB5964-3CY05-0AA0
2,020
1,550
850
1,595
20
0.4
50/95
3/–
4
1,900
8,500
64
4GB5964-3GY05-0AA0
2,220
1,570
855
1,595
20
0.4
50/95
3/–
6
1,900
8,200
72
4GB5964-3DY05-0AA0
2,020
1,610
870
1,435
20
0.4
50/95
3/–
6
1,500
8,200
64
4GB5964-3HY05-0AA0
2,220
1,650
875
1,455
20
0.4
50/125
3/–
6
1,900
9,400
72
4GB5967-3DY05-0AA0
2,160
1,660
880
1,485
30
0.4
70/145
3/–
6
2,650
7,900
72
4GB5975-3DY05-0AA0
2,620
1,740
965
1,695
pplies to Ur HV:
A
10 to 12 kV
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
Indication of 0.4 kV applies to
the voltage range of 0.4–0.45 kV
4) Ratings in brackets are not standardized
3)
5
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
283
Transformers
73
4GB6044-3CY05-0AA0
5
(1,250) 4)
1,600
(2,000) 4)
2,500
1)
284
LWA
Height
10,000
Pk120
Width
2,100
Po
Length
dB
4
uzr
Order No.
Total weight
W
3/–
Noise level
W
28/75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
1,000
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
2,440
1,550
990
1,730
10
0.4
28/75
3/–
4
1,600
10,000
65
4GB6044-3GY05-0AA0
2,850
1,620
990
1,795
10
0.4
28/75
3/–
6
2,000
9,500
73
4GB6044-3DY05-0AA0
2,370
1,640
990
1,490
10
0.4
28/75
3/–
6
1,500
9,500
65
4GB6044-3HY05-0AA0
2,840
1,710
990
1,565
20
0.4
50/95
3/–
4
2,800
9,500
73
4GB6064-3CY05-0AA0
2,420
1,570
990
1,790
20
0.4
50/95
3/–
4
2,300
8,700
65
4GB6064-3GY05-0AA0
2,740
1,680
990
1,665
20
0.4
50/95
3/–
6
2,300
9,400
73
4GB6064-3DY05-0AA0
2,310
1,640
990
1,620
20
0.4
50/95
3/–
6
1,800
9,400
65
4GB6064-3HY05-0AA0
2,510
1,660
990
1,620
20
0.4
50/125
3/–
6
2,300
11,000
73
4GB6067-3DY05-0AA0
2,470
1,670
990
1,650
30
0.4
70/145
3/–
6
3,100
10,000
73
4GB6075-3DY05-0AA0
2,990
1,800
1,060
1,795
10
0.4
28/75
3/–
6
2,400
11,000
75
4GB6144-3DY05-0AA0
2,780
1,740
990
1,635
10
0.4
28/75
3/–
6
1,800
11,000
67
4GB6144-3HY05-0AA0
3,140
1,770
990
1,675
20
0.4
50/95
3/–
6
2,700
11,200
75
4GB6164-3DY05-0AA0
2,740
1,780
990
1,645
20
0.4
50/95
3/–
6
2,100
11,200
67
4GB6164-3HY05-0AA0
3,010
1,810
990
1,645
20
0.4
50/125
3/–
6
2,700
10,500
75
4GB6167-3DY05-0AA0
2,980
1,810
990
1,675
30
0.4
70/145
3/–
6
3,600
11,500
75
4GB6175-3DY05-0AA0
3,580
1,870
1,065
1,895
10
0.4
28/75
3/–
6
2,800
14,000
76
4GB6244-3DY05-0AA0
3,490
1,830
990
1,735
10
0.4
28/75
3/–
6
2,100
14,000
68
4GB6244-3HY05-0AA0
4,130
1,880
990
1,775
20
0.4
50/95
3/–
6
3,100
13,500
76
4GB6264-3DY05-0AA0
3,440
1,840
995
1,830
20
0.4
50/95
3/–
6
2,400
13,500
68
4GB6264-3HY05-0AA0
3,830
1,870
1,000
1,880
20
0.4
50/125
3/–
6
3,100
12,500
76
4GB6267-3DY05-0AA0
3,690
1,860
995
1,880
30
0.4
70/145
3/–
6
4,100
13,500
76
4GB6275-3DY05-0AA0
4,350
1,970
1,090
1,995
10
0.4
28/75
3/–
6
3,500
15,700
78
4GB6344-3DY05-0AA0
4,150
1,940
1,280
1,935
10
0.4
28/75
3/–
6
2,600
15,700
70
4GB6344-3HY05-0AA0
4,890
1,970
1,280
2,015
20
0.4
50/95
3/–
6
4,000
15,400
78
4GB6364-3DY05-0AA0
4,170
1,980
1,280
1,960
20
0.4
50/95
3/–
6
2,900
15,400
70
4GB6364-3HY05-0AA0
4,720
2,010
1,280
1,985
20
0.4
50/125
3/–
6
4,000
15,500
78
4GB6367-3DY05-0AA0
4,430
2,020
1,280
2,005
30
0.4
70/145
3/–
6
5,000
15,000
78
4GB6375-3DY05-0AG0
5,090
2,100
1,280
2,135
10
0.4
28/75
3/–
6
4,300
18,700
81
4GB6444-3DY05-0AG0
4,840
2,090
1,280
2,070
10
0.4
28/75
3/–
6
3,000
18,700
71
4GB6444-3HY05-0AA0
5,940
2,160
1,280
2,135
20
0.4
50/95
3/–
6
5,000
18,000
81
4GB6464-3DY05-0AA0
5,200
2,150
1,280
2,165
20
0.4
50/95
3/–
6
3,600
19,000
71
4GB6464-3HY05-0AA0
6,020
2,190
1,280
2,180
20
0.4
50/125
3/–
6
5,000
18,000
81
4GB6467-3DY05-0AG0
5,020
2,160
1,280
2,105
30
0.4
70/145
3/–
6
5,800
20,000
81
4GB6475-3DY05-0AG0
5,920
2,280
1,280
2,215
pplies to Ur HV:
A
10 to 12 kV
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
3) Indication of 0.4 kV applies to
the voltage range of 0.4–0.45 kV
4) Ratings in brackets are not standardized
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Transformers
82
10
0.69
28/75
3/–
6
5,400
18,000
81
4GB6544-8DY05-0AA0
6,480
2,200
1,280
2,055
10
3.3
28/75
10/20
6
5,400
18,000
81
4GB6544-9DY05-0AA0
6,470
2,230
1,280
2,000
4,000
5,000
1)
LWA
4GB6544-3DY05-0AA0
Height
25,000
Pk120
Width
5,400
Po
Length
dB
6
uzr
Order No.
Total weight
W
3/–
Noise level
W
28/75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
3,150
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
6,500
2,450
1,280
2,310
20
0.4
50/95
3/–
6
6,000
24,000
81
4GB6564-3DY05-0AG0
6,170
2,320
1,280
2,230
20
0.69
50/95
3/–
6
6,200
18,000
81
4GB6564-8DY05-0AG0
6,080
2,170
1,280
2,105
20
3.3
50/95
10/20
6
6,200
18,000
81
4GB6564-9DY05-0AA0
6,660
2,280
1,280
2,030
20
0.4
50/125
3/–
6
6,200
21,000
81
4GB6567-3DY05-0AG0
6,290
2,340
1,280
2,300
20
0.69
50/125
3/–
6
6,200
18,000
81
4GB6567-8DY05-0AG0
6,170
2,170
1,280
2,150
20
3.3
50/125
10/20
6
7,300
18,000
81
4GB6567-9DY05-0AA0
6,770
2,300
1,280
2,060
10
0.69
28/75
3/–
6
6,300
20,000
81
4GB6644-8DY05-0AG0
7,970
2,360
1,280
2,245
10
3.3
28/75
10/20
6
6,300
19,000
81
4GB6644-9DY05-0AA0
8,570
2,450
1,280
2,080
10
6.3
28/75
20/40
6
6,300
19,000
76
4GB6644-9DY05-0AA0
9,210
2,570
1,280
2,125
20
0.69
50/95
3/–
6
7,600
21,000
83
4GB6664-8DY05-0AG0
7,330
2,280
1,280
2,330
20
3.3
50/95
10/20
6
7,600
19,000
83
4GB6664-9DY05-0AG0
7,450
2,460
1,280
2,050
20
6.3
50/95
20/40
6
7,600
19,000
83
4GB6664-9DY05-0AA0
8,710
2,590
1,280
2,055
20
0.69
50/125
3/–
6
7,600
21,000
85
4GB6667-8DY05-0AG0
7,430
2,400
1,280
2,335
20
3.3
50/125
10/20
6
7,600
19,000
83
4GB6667-9DY05-0AG0
7,850
2,430
1,280
2,100
20
6.3
50/125
20/40
6
7,600
19,000
85
4GB6667-9DY05-0AA0
8,990
2,610
1,280
2,125
10
3.3
28/75
10/20
6
7,600
21,000
81
4GB6744-9DY05-0AG0
9,620
2,480
1,280
2,290
10
6.3
28/75
20/40
6
7,600
23,000
78
4GB6744-9DY05-0AA0
10,370
2,590
1,400
2,290
10
3.3
28/75
10/20
8
7,600
23,000
76
4GB6744-9KY05-0AG0
9,680
2,600
1,280
2,250
10
6.3
28/75
20/40
8
7,600
24,000
78
4GB6744-9KY05-0AA0
10,490
2,690
1,400
2,290
2,210
20
3.3
50/95
10/20
6
9,000
21,000
83
4GB6764-9DY05-0AG0
9,090
2,530
1,280
20
6.3
50/95
20/40
6
9,000
23,000
83
4GB6764-9DY05-0AG0
9,650
2,600
1,280
2,295
20
3.3
50/125
10/20
6
9,000
21,000
83
4GB6767-9DY05-0AG0
9,400
2,530
1,280
2,280
20
6.3
50/125
20/40
6
9,000
22,000
83
4GB6767-9DY05-0AA0
9,980
2,640
1,285
2,365
20
3.3
50/95
10/20
8
9,000
23,000
83
4GB6764-9KY05-0AG0
9,090
2,600
1,280
2,210
20
6.3
50/95
20/40
8
9,000
24,000
83
4GB6764-9KY05-0AG0
9,750
2,710
1,295
2,295
20
3.3
50/125
10/20
8
9,000
23,000
83
4GB6767-9KY05-0AG0
9,090
2,610
1,280
2,240
20
6.3
50/125
20/40
8
9,000
24,000
83
4GB6767-9KY05-0AA0
10,330
2,720
1,400
2,290
pplies to Ur HV:
A
10 to 12 kV
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
5
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
285
Transformers
5
8,000
10,000
1)
286
LWA
W
W
dB
9,200
26,000
76
4GB6844-9DY05-0AG0
Height
Pk120
Width
Po
Length
6
uzr
Order No.
Total weight
10/20
Noise level
28/75
Load losses at 120 °C
%
3.3
No-load losses
kV
10
Impedance voltage
at rated current
kV
6,300
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
11,960
2,570
1,905
2,650
10
6.3
28/75
20/40
6
9,200
27,000
83
4GB6844-9DY05-0AG0
12,240
2,650
1,905
2,630
10
3.3
28/75
10/20
8
9,200
26,000
78
4GB6844-9KY05-0AG0
11,670
2,630
1,905
2,610
10
6.3
28/75
20/40
8
9,200
28,000
83
4GB6844-9KY05-0AG0
12,240
2,730
1,905
2,630
20
3.3
50/95
10/20
6
10,800
24,000
83
4GB6864-9DY05-0AG0
11,740
2,640
1,905
2,440
20
6.3
50/95
20/40
6
10,800
26,000
83
4GB6864-9DY05-0AG0
12,120
2,700
1,905
2,540
20
3.3
50/125
10/20
6
10,800
24,000
83
4GB6867-9DY05-0AG0
11,780
2,640
1,905
2,470
20
6.3
50/125
20/40
6
10,500
26,000
84
4GB6867-9DY05-0AG0
12,140
2,700
1,905
2,560
20
3.3
50/95
10/20
8
10,800
26,000
83
4GB6864-9KY05-0AG0
11,850
2,780
1,905
2,440
20
6.3
50/95
20/40
8
10,800
27,000
84
4GB6864-9KY05-0AG0
12,330
2,840
1,905
2,545
20
3.3
50/125
10/20
8
10,500
25,500
83
4GB6867-9KY05-0AG0
11,890
2,770
1,905
2,470
20
6.3
50/125
20/40
8
10,500
27,000
84
4GB6867-9KY05-0AG0
12,290
2,820
1,905
2,560
20
6.3
50/95
20/40
6
13,000
32,000
85
4GB6964-9DY05-0AG0
14,290
2,840
1,905
2,720
20
11
50/95
28/60
6
13,000
32,000
85
4GB6964-9DY05-0AG0
15,610
2,950
1,905
2,790
20
6.3
50/125
20/40
6
13,000
32,000
85
4GB6967-9DY05-0AG0
14,540
2,900
1,905
2,750
20
11
50/125
28/60
6
13,000
32,000
85
4GB6967-9DY05-0AG0
15,810
2,960
1,905
2,820
20
6.3
50/95
20/40
8
13,000
34,000
85
4GB6964-9KY05-0AG0
14,360
2,970
1,905
2,720
20
11
50/95
28/60
8
13,000
34,000
85
4GB6964-9KY05-0AG0
15,600
3,070
1,905
2,790
20
6.3
50/125
20/40
8
13,000
34,000
85
4GB6967-9KY05-0AG0
14,370
2,940
1,905
2,750
20
11
50/125
28/60
8
13,000
34,000
85
4GB6967-9KY05-0AG0
15,680
3,080
1,905
2,820
30
6.3
70/145
20/40
6
13,500
36,000
84
4GB6975-9DY05-0AG0
16,230
2,890
1,905
3,290
30
11
70/145
28/60
6
13,500
38,000
84
4GB6975-9DY05-0AG0
17,670
3,040
1,905
3,260
2,900
20
6.3
50/95
20/40
6
15,200
36,000
85
4GB7064-9DY05-0AG0
17,280
3,020
1,905
20
11
50/95
28/60
6
15,200
36,000
85
4GB7064-9DY05-0AG0
18,130
3,180
1,905
2,830
20
6.3
50/125
20/40
6
15,200
38,000
85
4GB7067-9DY05-0AG0
17,650
3,080
1,905
2,970
20
11
50/125
28/60
6
15,200
38,000
85
4GB7067-9DY05-0AG0
18,760
3,230
1,905
2,900
20
6.3
50/95
20/40
8
15,200
36,000
85
4GB7064-9KY05-0AG0
17,280
3,140
1,905
2,900
20
11
50/95
28/60
8
15,200
36,000
85
4GB7064-9KY05-0AG0
17,660
3,265
1,905
2,790
20
6.3
50/125
20/40
8
15,200
38,000
85
4GB7067-9KY05-0AG0
17,410
3,130
1,905
2,930
20
11
50/125
28/60
8
15,200
38,000
85
4GB7067-9KY05-0AG0
17,740
3,270
1,905
2,820
30
6.3
70/145
20/40
6
15,600
39,000
85
4GB7075-9DY05-0AG0
19,390
3,090
1,905
3,460
30
11
70/145
28/60
6
15,600
42,000
85
4GB7075-9DY05-0AG0
20,890
3,270
1,905
3,450
pplies to Ur HV:
A
10 to 12 kV
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Transformers
85
16,000
1)
LWA
4GB7164-9DY05-0AG0
Height
42,000
Pk120
Width
18,200
Po
Length
dB
6
uzr
Order No.
Total weight
W
20/40
Noise level
W
50/95
Load losses at 120 °C
%
6.3
No-load losses
kV
20
Impedance voltage
at rated current
kV
12,500
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage3) (no-load)
kVA
Ur
HV
kV
Rated power
Rated primary voltage1)
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
21,450
3,205
1,905
3,100
20
11
50/95
28/60
6
18,200
44,000
85
4GB7164-9DY05-0AG0
22,340
3,325
1,905
3,130
20
6.3
50/125
20/40
6
18,200
42,000
85
4GB7167-9DY05-0AG0
21,670
3,235
1,905
3,130
20
11
50/125
28/60
6
18,200
44,000
85
4GB7167-9DY05-0AG0
23,010
3,355
1,905
3,160
20
6.3
50/95
20/40
8
18,200
44,000
85
4GB7164-9KY05-0AG0
21,280
3,330
1,905
3,060
20
11
50/95
28/60
8
18,200
46,000
85
4GB7164-9KY05-0AG0
22,930
3,480
1,905
3,130
20
6.3
50/125
20/40
8
18,200
44,000
85
4GB7167-9KY05-0AG0
21,450
3,350
1,905
3,090
20
11
50/125
28/60
8
18,200
46,000
85
4GB7167-9KY05-0AG0
23,290
3,500
1,905
3,160
30
6.3
70/145
20/40
6
18,500
46,000
85
4GB7175-9DY05-0AG0
24,120
3,250
1,905
3,580
30
11
70/145
28/60
6
18,500
48,000
85
4GB7175-9DY05-0AG0
25,030
3,390
1,905
3,610
20
6.3
50/95
20/40
6
22,000
53,000
88
4GB7264-9DY05-0AG0
26,440
3,190
1,905
3,980
20
11
50/95
28/60
6
22,000
53,000
88
4GB7264-9DY05-0AG0
26,380
3,310
1,905
3,700
20
6.3
50/125
20/40
6
22,000
53,000
88
4GB7267-9DY05-0AG0
26,720
3,230
1,905
4,010
20
11
50/125
28/60
6
22,000
53,000
88
4GB7267-9DY05-0AG0
26,750
3,385
1,905
3,730
20
6.3
50/95
20/40
8
22,000
55,000
88
4GB7264-9KY05-0AG0
26,170
3,325
1,905
3,940
20
11
50/95
28/60
8
22,000
55,000
88
4GB7264-9KY05-0AG0
26,460
3,455
1,905
3,700
20
6.3
50/125
20/40
8
22,000
55,000
88
4GB7267-9KY05-0AG0
26,530
3,350
1,905
4,010
20
11
50/125
28/60
8
22,000
55,000
88
4GB7267-9KY05-0AG0
26,680
3,455
1,905
3,730
30
6.3
70/145
20/40
6
22,000
55,000
86
4GB7275-9DY05-0AG0
28,930
3,410
1,905
3,860
30
11
70/145
28/60
6
22,000
55,000
86
4GB7275-9DY05-0AG0
29,160
3,575
1,905
3,650
pplies to Ur HV:
A
20 to 24 kV
30 to 36 kV
2)
Dimension
drawing: page 264,
indications are approximate values
5
GEAFOL cast-resin transformers comply with IEC 60076-11 or DIN EN 60076-11 and VDE
0532-76-11 without housing, vector group Dyn5, 50 Hz, rated power > 3150 kVA are not
standardized. Other versions and special equipment on request.
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
287
Transformers
5.9 Distribution Transformers
A
2U
2V
3
2W
2N
1
1U
1V
1W
2
H
5
k
e
f
Dimension drawing
Dimensions A, B and H, see pages 258 – 263
Dimension e applies to lengthways and sideways travel
1 High-voltage terminals
2 High-voltage tappings on HV side
3 Low-voltage terminals
Fig. 5.9-14: Dimension drawing of GEAFOL cast-resin transformers
Notes
The technical data, dimensions and weights are subject to change unless otherwise stated on the
individual pages of this catalog. The illustrations are for reference only.
All product designations used are trademarks or product names of Siemens AG or of other suppliers.
All dimensions in this catalog are given in mm.
The information in this document contains general descriptions of the technical options available,
which do not always have to be present in individual cases. The required features should therefore be
specified in each individual case at the time of closing the contract.
288
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
g
B
Design up to 100 kVA without rollers
Transformers
70
4GT5844-3CY05-0AB0
(800) 1)
1,000
1) Power
LWA
Order No.
Height
7,700
Pk120
Width
1,500
Po
Length
dB
4
uzr
Total weight
W
AV3/–
Noise level
W
AV28-LI75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
630
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage (no-load)
kVA
Ur
HV
kV
Rated power1)
Rated primary voltage
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
a2)
b2)
h2)
approx.
kg
mm
mm
mm
1,540
1,270
820
1,430
10
0.4
AV28-LI75
AV3/–
4
1,150
7,700
62
4GT5844-3GY05-0AB0
1,730
1,300
820
1,470
10
0.4
AV28-LI75
AV3/–
6
1,400
7,400
70
4GT5844-3DY05-0AB0
1,490
1,385
835
1285,
10
0.4
AV28-LI75
AV3/–
6
1,100
7,400
62
4GT5844-3HY05-0AB0
1,640
1,415
840
1,325
20
0.4
AV50-LI95
AV3/–
4
1,800
7,700
70
4GT5864-3CY05-0AB0
1,620
1,340
855
1,435
20
0.4
AV50-LI95
AV3/–
4
1,350
7,700
62
4GT5864-3GY05-0AB0
1,880
1,390
860
1,505
20
0.4
AV50-LI95
AV3/–
6
1,650
6,900
70
4GT5864-3DY05-0AB0
1,550
1,460
875
1,270
20
0.4
AV50-LI95
AV3/–
6
1,200
6,900
62
4GT5864-3HY05-0AB0
1,750
1,490
880
1,320
20
0.4
AV50-LI125
AV3/–
6
1,750
7,700
70
4GT5867-3DY05-0AB0
1,680
1,440
920
1,515
30
0.4
AV70-LI145
AV3/–
6
2,150
6,500
71
4GT5875-3DY05-0AB0
2,130
1,630
965
1,625
10
0.4
AV28-LI75
AV3/–
4
1,800
8,700
72
4GT5944-3CY05-0AB0
1,840
1,360
830
1,470
10
0.4
AV28-LI75
AV3/–
4
1,400
8,700
64
4GT5944-3GY05-0AB0
2,040
1,390
835
1,455
10
0.4
AV28-LI75
AV3/–
6
1,700
8,300
72
4GT5944-3DY05-0AB0
1,790
1,440
845
1,400
10
0.4
AV28-LI75
AV3/–
6
1,300
8,300
64
4GT5944-3HY05-0AB0
1,980
1,465
850
1,400
20
0.4
AV50-LI95
AV3/–
4
2,150
8,700
72
4GT5964-3CY05-0AB0
1,870
1,400
865
1,525
20
0.4
AV50-LI95
AV3/–
4
1,550
8,700
64
4GT5964-3GY05-0AB0
2,100
1,435
870
1,510
20
0.4
AV50-LI95
AV3/–
6
1,950
8,500
72
4GT5964-3DY05-0AB0
1,800
1,465
875
1,435
20
0.4
AV50-LI95
AV3/–
6
1,450
8,500
64
4GT5964-3HY05-0AB0
1,990
1,495
880
1,435
20
0.4
AV50-LI125
AV3/–
6
2,100
8,600
72
4GT5967-3DY05-0AB0
1,960
1,510
930
1,550
30
0.4
AV70-LI145
AV3/–
6
2,500
8,500
72
4GT5975-3DY05-0AB0
2,420
1,685
925
1,690
10
0.4
AV28-LI75
AV3/–
4
2,100
10,000
73
4GT6044-3CY05-0AB0
2,170
1,395
990
1,615
10
0.4
AV28-LI75
AV3/–
4
1,650
10,000
65
4GT6044-3GY05-0AB0
2,410
1,435
990
1,615
1,440
10
0.4
AV28-LI75
AV3/–
6
2,000
9,300
73
4GT6044-3DY05-0AB0
2,080
1,500
990
10
0.4
AV28-LI75
AV3/–
6
1,500
9,300
65
4GT6044-3HY05-0AB0
2,300
1,535
990
1,480
20
0.4
AV50-LI95
AV3/–
4
2,500
10,000
73
4GT6064-3CY05-0AB0
2,180
1,435
990
1,655
20
0.4
AV50-LI95
AV3/–
4
1,800
10,000
65
4GT6064-3GY05-0AB0
2,460
1,460
990
1,695
20
0.4
AV50-LI95
AV3/–
6
2,300
9,500
73
4GT6064-3DY05-0AB0
2,120
1,525
990
1,535
20
0.4
AV50-LI95
AV3/–
6
1,700
9,500
65
4GT6064-3HY05-0AB0
2,370
1,575
990
1,520
20
0.4
AV50-LI125
AV3/–
6
2,500
10,000
73
4GT6067-3DY05-0AB0
2,290
1,590
990
1,625
30
0.4
AV70-LI145
AV3/–
6
2,900
10,000
73
4GT6075-3DY05-0AB0
2,720
1,715
1,015
1,760
ratings shown in parentheses are
not preferred values.
2)
imension drawing: page 267,
D
indications are approximate values.
5
All GEAFOL Basic transformers comply with DIN VDE 0532-76-11/DIN EN
60076-11/IEC 60076-11/DIN EN 50541-1. Power ratings >2500 kVA and
different designs and special equipment on request.
Table 5.9-4: GEAFOL Basic cast-resin transformer
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289
Transformers
75
4GT6144-3DY05-0AB0
1600
5
(2,000)1)
2,500
1) Power
Order No.
a2)
b2)
h2)
approx.
kg
mm
mm
mm
2,390
1,595
990
1,545
10
0.4
AV28-LI75
AV3/–
6
1,850
11,600
67
4GT6144-3HY05-0AB0
2,670
1,640
990
1,545
20
0.4
AV50-LI95
AV3/–
6
2,700
11,600
75
4GT6164-3DY05-0AB0
2,550
1,635
990
1,635
20
0.4
AV50-LI95
AV3/–
6
2,050
11,600
67
4GT6164-3HY05-0AB0
2,780
1,615
990
1,710
20
0.4
AV50-LI125
AV3/–
6
2,900
11,500
75
4GT6167-3DY05-0AB0
2,680
1,640
1,035
1,725
30
0.4
AV70-LI145
AV3/–
6
3,500
11,800
75
4GT6175-3DY05-0AB0
3,050
1,760
1,025
1,850
10
0.4
AV28-LI75
AV3/–
6
2,800
13,600
76
4GT6244-3DY05-0AB0
2,940
1,705
990
1,605
10
0.4
AV28-LI75
AV3/–
6
2,100
13,600
68
4GT6244-3HY05-0AB0
3,300
1,745
990
1,650
20
0.4
AV50-LI95
AV3/–
6
3,100
13,200
76
4GT6264-3DY05-0AB0
3,150
1,765
1,010
1,690
20
0.4
AV50-LI95
AV3/–
6
2,400
13,200
68
4GT6264-3HY05-0AB0
3,540
1,800
1,015
1,780
20
0.4
AV50-LI125
AV3/–
6
3,500
14,200
76
4GT6267-3DY05-0AB0
3,280
1,790
1,010
1,790
30
0.4
AV70-LI145
AV3/–
6
4,100
13,500
76
4GT6275-3DY05-0AB0
3,620
1,825
1,035
2,035
10
0.4
AV28-LI75
AV3/–
6
3,500
15,500
78
4GT6344-3DY05-0AB0
3,560
1,805
1,280
1,705
10
0.4
AV28-LI75
AV3/–
6
2,600
15,500
70
4GT6344-3HY05-0AB0
4,020
1,855
1,280
1,755
20
0.4
AV50-LI95
AV3/–
6
3,900
15,800
78
4GT6364-3DY05-0AB0
3,620
1,785
1,280
1,900
20
0.4
AV50-LI95
AV3/–
6
2,900
15,800
70
4GT6364-3HY05-0AB0
4,000
1,820
1,280
1,950
20
0.4
AV50-LI125
AV3/–
6
4,200
16,200
78
4GT6367-3DY05-0AB0
3,840
1,845
1,280
1,965
30
0.4
AV70-LI145
AV3/–
6
5,000
15,500
78
4GT6375-3DY05-0AB0
4,390
1,930
1,280
2,130
10
0.4
AV28-LI75
AV3/–
6
4,300
20,000
81
4GT6444-3DY05-0AB0
4,280
1,895
1,280
1,940
10
0.4
AV28-LI75
AV3/–
6
3,000
20,000
71
4GT6444-3HY05-0AB0
4,940
1,920
1,280
2,005
20
0.4
AV50-LI95
AV3/–
6
4,700
19,000
81
4GT6464-3DY05-0AB0
4,370
1,910
1,280
1,950
20
0.4
AV50-LI95
AV3/–
6
3,500
19,000
71
4GT6464-3HY05-0AB0
4,860
1,955
1,280
2,000
20
0.4
AV50-LI125
AV3/–
6
5,000
19,000
81
4GT6467-3DY05-0AB0
4,550
1,900
1,280
2,140
30
0.4
AV70-LI145
AV3/–
6
5,800
17,500
81
4GT6475-3DY05-0AB0
5,210
2,045
1,280
2,250
ratings shown in parentheses are
not preferred values.
290
LWA
Height
11,600
Pk120
Width
2,400
Po
Length
dB
6
uzr
Total weight
W
AV3/–
Noise level
W
AV28-LI75
Load losses at 120 °C
%
0.4
No-load losses
kV
10
Impedance voltage
at rated current
kV
(1250)1)
Insulation level LV
(AC/LI)
Ur
LV
kV
Sr
Insulation level HV
(AC/LI)
Rated secondary
voltage (no-load)
kVA
Ur
HV
kV
Rated power1)
Rated primary voltage
tapping ± 2 x 2.5 %
5.9 Distribution Transformers
2)
imension drawing: page 267,
D
indications are approximate
values.
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
All GEAFOL Basic transformers comply with DIN VDE 0532-76-11/DIN EN
60076-11/IEC 60076-11/DIN EN 50541-1. Power ratings >2500 kVA and
different designs and special equipment on request.
Transformers
5.9 Distribution Transformers
A1
3
2N
2U, 2V, 2W
1
1U
1V
1W
2
H1
5
k
e
f
g
B1
Dimension drawing
Dimensions A1, B1 and H1, see pages 265 – 266
Dimension e applies for longitudinal and transverse travel
1 High-voltage terminal
2 High-voltage tappings on the HV terminal side
3 Low-voltage terminal
Fig. 5.9-15: Dimension drawing GEAFOL Basic cast-resin transformers
For further information:
Fax: ++49 (0) 70 21-5 08-4 95
www.siemens.com/energy/transformers
Siemens Energy Sector • Power Engineering Guide • Edition 7.1
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Transformers
5.10 Traction Transformers
Siemens produces transformers for railway applications called
traction transformers. These transformers are installed in electric
cars such as high-speed trains, electric multiple units (EMUs)
and electric locomotives. Their main purpose is transform the
overhead contact line voltage, which range mainly from 15 kV
up to 25 kV, to voltages suitable for traction converters
(between 0.7 kV and 1.5 kV) (fig. 5.10-1).
Siemens develops and produces traction transformers for rolling
stock applications of all relevant ratings, voltage levels and
customer-specific requirements.
All products are optimized with regard to individual customer
requirements such as:
• Frequency, rating and voltage
• Required dimensions and weights
• Losses and impedance voltage characteristics
• Operational cycles and frequency response behavior
• Environmental requirements.
5
Characterization
Technically, traction transformers are in general characterized as
follows:
• 1-phase transformers
• Ratings up to 10 MVA and above
• Operating frequencies from 16⅔ to 60 Hz
• Voltages: 1.5 kV DC, 3 kV DC, 15 kV, 25 kV, 11.5 kV
or other specific solutions
• Weight: < 15 t
• Auxiliary windings and/or heater windings according to
customer specification
• Single or multiple system operation
• Under floor, machine room or roof assembly
• Traction windings to be used as line filters.
Fig. 5.10-1: Traction transformer for high-speed trains
• Integrated absorption circuit reactors
• Various cooling media for all ratings: mineral oil, silicone or
ester fluid for highest environmental compatibility.
In case of customer request:
• With cooling plant – integrated in one frame together with the
transformer or stand-alone solution
• Nomex insulation for highest energy density.
Examples
The examples shown in the table are typical applications where
traction transformers from Siemens were used (table 5.10-1).
High-speed train AVE S102 for RENFE Spain
Electric locomotive for ÖBB Austria
(1216 Series) for cross-european haulage
World’s most powerful series-production
freight locomotive for China
Operation: Madrid – Barcelona
Travel time: 2 h 30 min for 635 km
Number of cars: 8
Power system: 25 kV/50 Hz
Maximum power at wheel: 8,800 kW
Max. speed: 350 km/h
Number of seats: 404
4 system operation
AC 15 kV: 16⅔ Hz
AC 25 kV 50 Hz
DC 3 kV
DC 1.5 kV
Speed: 200 – 230  km/h
Weight 87 t
6 axle machine
9,600 kW on 6 axles
hauling of 20,000 t trains
Table 5.10-1: Siemens develops and produces traction transformers for rolling stock applications of all relevant ratings and voltage levels
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Transformers
5.11 Transformer Lifecycle
Management
Introduction
Power transformers usually perform their work, humming
quietly for decades, without any interruption. Operators have
thus come to rely on their solid transformer capacity, often
performing only minimal maintenance using traditional
­techniques.
Today, load requirements, additional environmental constraints,
and recent corporate sustainability objectives to keep a close eye
on the operational value of the equipment, have led Siemens to
provide a comprehensive set of solutions to keep the equipment
at peak level under any operational circumstances. A new generation of asset managers is interested in the “operational” value,
including the replacement cost, instead of the depreciated
book-value over decades, which is often close to zero.
Power transformers are long-lasting capital investment goods.
Purchasing and replacement require long periods of planning
engineering and procurement. Each individual conception is
specially adapted to the specific requirements. The corresponding high replacement value, and the important lead time
are in the focus.
5
Fig. 5.11-1: Siemens Transformer Lifecycle Management™
scope of services
What is TLM™?
Siemens Transformer Lifecycle Management™ (TLM™) includes
highly experienced transformer experts who provide the most
effective lifecycle solutions for power transformers of any age
and any brand (fig. 5.11-1).
Maintaining the operators’ power transformers at peak operating level is the prime objective of the Siemens TLM set of
solutions. Siemens TLM is based on the expertise available in
all Siemens transformer factories, which are well-known for
high quality and low failure rates. The TLM scope of services
is explained in the following briefly:
Conditon assessment and diagnostics (fig. 5.11-2)
• Level 1: SITRAM® DIAG ESSENTIAL
• Level 2: SITRAM® DIAG ADVANCED
• Level 3: SITRAM® DIAG HIGH-VOLTAGE TESTING.
The SITRAM® DIAG program consists of three levels, and provides
diagnostic modules for individual transformers, and for the assessment of complete installed fleets and transformer populations.
SITRAM® DIAG ESSENTIAL (Level 1)
All modules in the diagnosis level 1 “ESSENTIAL” are to be
applied on energized transformers. The most powerful toolbox
for this application is the diagnosis of the insulating liquid.
Additional stand-alone modules are available to be applied when
the oil tests and/or the operating personnel informs about
deficiencies or changes.
Fig. 5.11-2: SITRAM® DIAG provides diagnostic modules for
individual transformers and for the assessment of
complete fleets
• Standard oil test (8 –12 parameters)
• Dissolved gas in oil analysis (DGA)
• Furanic components
• Moisture.
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Transformers
5.11 Transformer Lifecycle Management
5
SITRAM® DIAG HIGH-VOLTAGE TESTING (Level 3)
High-voltage tests on site are usually required following on-site
repairs, factory repairs, refurbishment or relocation, and are also
performed to assure the results from the level 1 and level 2
assessments. The SITRAM DIAG mobile test fields provides
solutions for all kind of HV testing and loss measurement. Heat
runs or long duration tests are feasible depending on size and
voltage level of the transformer under test. Level 3 assessment
can be combined with all modules out of level 1 and level 2.
• Load losses
• No-load losses and currents
• Applied overvoltage tests
• Induced overvoltage tests
• Partial discharge testing
• DC testing
• Heat runs
• Long duration tests.
The Siemens SITRAM® MONITORING range is providing compatible, modular and customized solutions for individual power
transformers (new and retrofit), and solutions for entire transformer fleets.
In general, these systems allow a continuous monitoring of
power transformers, which go far beyond the traditional method
of taking offline measurements. The experience demonstrates
clearly that, with online monitoring, an improved efficiency in
the early detection of faults can be achieved, so that curative
and corrective maintenance actions can be planned and scheduled well in advance. It is also possible to use spare capacities
up to the limits. This results in a higher reliability, efficiency,
and longer service life of power transformers.
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Substation SCADA
SICAM 230
IEC 60 870-5-104
IEC 61850
Modbus TCP
DNP3
DGA
Bushing
OLTC
PD
Satus siganls
SITRAM® DIAG ADVANCED (Level 2)
The extended modules are applied on de-energized and
disconnected transformers. Most measurements repeat the
measurements as shown in the manufacturers test report, and
by comparing the results any differences will be highlighted.
Level 2 provides information about the insulation (dielectric)
condition as well as the mechanical condition (displacements)
of the active part of a transformer.
• Ratio and phase angle
• Winding resistance
• C-tan delta (windings and bushings)
• Insulation resistance and
• Polarization index (PI)
• Impedance
• No load current and losses
• At low voltage
• FDS/PDC
• FRA.
Transformer/Shunt/Phase shifter
Temp. etc.
Additional stand-alone modules:
• PD (UHF, acoustic sensors, corona camera)
• Noise measurement
• Vibration measurement
• Thermograph scans.
I/O or
3rd Party
Systems
Fig. 5.11-3: System platform
SITRAM sensors
The family of sensors comprises standardized, proven online
sensor technologies as standalone solutions for individual
transformers. Different kinds of warning instruments alert staff
if deviations develop that might lead to failures or unplanned
downtimes. This applies also if diagnostic or repair measures
become necessary. There are four main groups for monitoring
sensors:
• DGA monitoring
• OLTC monitoring
• BUSHING monitoring
• PD monitoring.
The top-down priority of the used sensors is according experiences of failure rates of transformers subsystems.
SITRAM Condition Monitor (SITRAM CM):
Experience has shown that early detection of arising failures
is simply not possible without online monitoring. It allows
measures for troubleshooting and repair to be planned and
scheduled in advance, which means greater availability and
a longer service life of transformers.
The SITRAM Condition Monitor is a modular and customized
system, which integrates information from single stream sensors
for each transformer individually, and is able to provide condition
information about all key components. A local data storage
module and a communication interface enable the user to
access the information remotely.
SITRAM Fleet Monitoring
For a fleet monitoring apporach the control system SICAM230 of
Siemens is used. All possible subsystem sensors of any type or
make as well as any I/O devices can be integrated. For effective
information interchange, all necessary protocols to the overlaying SCADA system can be provided. That approach is shown
in fig. 5.11-3.
Transformers
5.11 Transformer Lifecycle Management
In case of critical transformers and difficult decisions, automated
systems and algorithms are of limited use so far. Siemens TLM
experts via remote access, or experts in a central control room
can in case of raised alarms recommend subsequent actions to
local service personal. The status information management is
optimally supported by the SITRAM CAM.
SITRAM Condition Assessment Monitor (CAM) (fig. 5.11-4)
The SITRAM CAM solution makes it possible to systematically
evaluate individual transformers, and thus to render all transformers in the database comparable with each other. A score is
assigned based on standardized criteria. Three categories are
visualised in the “stoplight” colors.
Inspection findings are described in detail, and recommendations
regarding meastures to be initiated are generated.
Fig. 5.11-4: Screenshot of the German CAM system in use
Consulting expertise and training
• Engineering service
• Advice and recommendations
• Educational seminars
• Customer-tailored workshops or trainings.
5
The Siemens TLM set of solutions integrates a wide range of
services that are designed to considerably extend the life of the
operator‘s transformers. Siemens’ preferred approach is to
integrate all transformers – of any age and any brand – in the
plan that is prepared for the respective customers, so that they
can make the best decision about replacement/extension and
any related matters. Siemens TLM also offers a series of standardized customer trainings. These programs are specifically
designed to broaden the operator’s awareness of the various
concept and design options. Lifecycle management is, of
course, an integral part of the training.
Maintenance and lifecycle extension
• Preventive and corrective maintenance
• On site active part drying and de-gassing
• Oil regeneration
• Life extension products
• End of life management.
Siemens gets your transformers back in top form – and without
service interruptions. The TLM™ products for extending service
life minimize the unavoidable, undetectable and ongoing aging
process that is taking place inside transformers. These internationally-recognized technologies for life extension are rounded
up by a cooling efficiency retrofit solution.
SITRAM DRY (fig. 5.11-5)
The SITRAM® DRY is an advanced technology for preventive and
continuous online transformer drying. The system removes
moisture from the insulation oil through disturbing the moisture
equilibrium, so that moisture diffuses from the wet insulation
paper to the dried insulation oil. This process will remove the
moisture in a gentle and smooth way from the solid insulation,
and will increase the dielectric strength of the insulating oil.
Fig. 5.11-5: Cabinet version of the SITRAM DRY equipped
with a control module
• Continuous online removal of moisture from solid insulation
and oil
• Based on a molecular sieve technology
• Easy to install on any transformer in operation
• Temperature and moisture monitoring
• Cartridge replacement and regeneration service
• Cabinet version
• SITRAM® DRY: smart, mobile solution for distribution
transformers.
Experience the functions of SITRAM® DRY in sound and vision:
www.siemens.de/energy/sitram-dry-video
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295
Transformers
5.11 Transformer Lifecycle Management
SITRAM REG
Siemens developed the SITRAM® REG technology to clean
contaminated oil and restore its dielectric properties. SITRAM®
REG is a modified reclamation process based on the IEC 60422
standard. Oil is circulated continuously through regeneration
columns.
• An oil change is not required
• Improves the quality of insulating oil to that of new oil
• Prolongation of the lifetime, and increased reliability of old
transformers
• Preventive action against the progressive insulation ageing
process
• Sustainable improvement in the condition of the insulation
• Suitable for all power transformers
• Economically independent of the current price of new oil
• No service interruptions
• Great and long-lasting cleaning effect
• New: removal of corrosive sulphur.
Experience the function of SITRAM REG in sound and vision in
our video: www.energy.siemens.com/includes/root/apps/pmapi/
siemens-energy-power-transmission-sreg-trailersitram-2818783076001.mp4.
5
SITRAM COOL
SITRAM COOL is an add-on retrofit solution, and consists of
hardware and software for the automatic, optimized control
of transformer cooling system:
• Increase of the total efficiency of the transformer
• Reduction of auxiliary losses
• Reduction of noise level
• Reduction of maintenance
• If required and if applicable –> upgrading.
Spare parts and accessories
Specific planning and punctual delivery of quality spare parts
and components – Siemens TLM fulfills the complete need of
system operators, with the aim of maximizing the availability of
every transformer, minimizing downtimes, and reducing the
total costs involved.
Spare parts from Siemens TLM™ offer (fig. 5.11-6):
• Stringent quality assurance standards to ensure that spare
parts are manufactured in accordance with the Siemens
specifications
• Continuous improvement of technology and materials
• Outage planning and support based on customized spare parts
programs
• Spare parts service for all transformers in the Siemens family
(SIEMENS, Trafo-Union, VA TECH, ELIN, PEEPLES, Volta, AEG)
• Spare parts service for transformers from other manufactures
(ABB, BBC, Hyundai, Tamini, SEA, ASA, Alstom, Greta, etc.)
• Spare parts service for distribution and transmission
transformers.
In order to provide the best solution, Siemens TLM™ will verify
alternative products and strive to make technical improvements
using state-of-art technologies, which is especially important
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Fig. 5.11-6: Maximizing the availibility of every transformer
with the TLM™ spare part program
when original spare parts are no longer available. Upon request,
Siemens may advise system operators on what accessories will
best fit their needs.
Examples include:
• Protection devices
• Bushings
• Gaskets
• Cooling systems
• Pumps
• OLTCs
• and any other changeable parts of the transformer.
What you can expect from Siemens:
• Higher availability and reliability
• Longer inspection intervals
• Lower costs due to longer lifetime
• Higher safety in the business
• Lower failure costs thanks to an immediate spare part supply.
Repair and retrofit
Can Siemens make an old transformer as good as new? Siemens
can come very close and usually improve old transformers with
new state-of-the-art technologies. One highlight of TLM™ is the
repair, overhaul, and modernization of power transformers.
Repairs are performed in one of Siemens’ dedicated repair shops
around the world, but are also done on-site when mobile
Siemens workshops come to the customer’s facility. In addition,
Siemens can retrofit or modernize transformers in various ways.
Whether the operator’s transformer has failed or timely corrective maintenance is planne, the Siemens TLM™ team of experts
is available for short-term repairs.
With its dedicated repair facilities at our technology center in
Nuremberg, Germany, and elsewhere around the world,
Siemens has created a professional setting to get the customers’
transformers back into shape. Even the largest and heaviest
transformers in the world can be easily moved, inspected and
repaired.
Transformers
5.11 Transformer Lifecycle Management
The repair facilities handle all problems that arise over the
lifecycle of a transformer, including installation of new on-load
tap changers and tapping switches, increasing performance,
as well as complete replacement of windings. In addition, all
components can be reconditioned and retrofitted with the latest
materials as needed. For everything from design to the latest
modern winding techniques, as well as to final inspection and
testing, the manufacturing processes at Siemens’ renowned
transformer plants are continuously being improved. These
improvements support the maintenance and repair of the
customers’ transformers (fig. 5.11-7).
Transport, installation and commissioning
Siemens technical experts and engineers, who work on projects
that include installing new transformers or changing the locations of old transformers, have decades of experience. They are
expert at disassembly and preparation for transport, storing,
and handling of delicate components. Assembly is the daily
work of these Siemens experts, and Siemens offers its exhaustive experience for complete customer solutions, so that their
equipment value remains at its peak for a long time.
5
Fig. 5.11-7: Repair shop in Nuremberg, Germany
For further information, please contact your
local Siemens sales representative or contact:
Phone: +49 (180) 524 7000
Fax: +49 (180) 524 2471
E-mail: [email protected]
www.siemens.com/energy/TLM
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