Surge Suppressor Capacitors

VISHAY I N T E R T E C H N O L O G Y , I N C .
INTERACTIVE
data book
surge suppressor capacitors
vishay ESTA
vse-db0104-0806
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surge suppressor capacitors
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Surge Suppressor Capacitors
Vishay ESTA
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Table of Contents
Vishay ESTA
Surge Suppressor Capacitors
DESCRIPTION
Applications........................................................................................................................................................................
2
Construction .......................................................................................................................................................................
2
Standard Specifications .....................................................................................................................................................
2
Current-Carrying Capacity .................................................................................................................................................
2
Technical Data ...................................................................................................................................................................
2
Capacitance Values to VDE 0675......................................................................................................................................
2
Mode of Operation .............................................................................................................................................................
2
Protection against Power-Frequency Voltages Transferred Capacitively ..........................................................................
4
Connection .........................................................................................................................................................................
5
SINGLE PHASE TYPES .................................................................................................................................................
6
THREE PHASE TYPES ................................................................................................................................................... 10
ZINC OXIDE RC-SURGE SUPRESSOR (ZORC) FOR HV-MOTOR AND
TRANSFORMERS M-TYPE AND PANEL MOUNTING P-TYPE............................................................................. 12
ZORC - TECHNICAL DATA ........................................................................................................................................... 13
Revision: 20-May-08
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1
Description
Vishay ESTA
APPLICATIONS
CURRENT-CARRYING CAPACITY
RC surge suppressors are designed to protect the windings
of electrical machines and transformers against steep
fronted and high voltage impulses which occur as a result of
atmospheric discharges.
To reduce power-frequency voltages which are transferred
capacitively to the secondary or tertiary side of the
transformers in the event of an earth fault occuring on the
primary side.
RC surge suppressors installed in systems with an insulated
neutral or earthed through arc-suppressions coils and in
systems with a rigidly earthed neutral can be loaded
continuously at 120 % rated voltage and used at frequencies
of up to 60 Hz.
All the surge suppressors meet the insulation requirements
for equipment rated at 1 kV and above (VDE 0111/12.66).
TECHNICAL DATA
CONSTRUCTION
The RC surge suppressors can have either indoor or outdoor
bushings. Their active parts are flat-type winding elements
with two electrodes which are insulated from each other. The
winding elements are incorporated into the capacitor casing.
Both air and moisture are extracted under vacuum and at
high temperature and all cavities are filled with an
impregnant. The capacitor casings are either of aluminum or
of stainless steel and are given two coatings of paint.
Capacitors for rated voltages of up to 24 kV form the basic
units.
Those for 7.2 kV have two bushings. Capacitors for 12 kV
and above have one bushing and the second pole is
connected to the casing.
Capacitors to be used in systems with voltage higher than
24 kV are mounted on base insulators, with a maximum of
two capacitors connected in series on the same insulator.
Dielectric
All film polypropylene
Impregnant
Non PCB
Rated voltage
7.2 kV to 36 kV
Rated capacitance
0.05 µF to 0.8 µF
Temperature class
- 25 °C to + 50 °C
Installation
Indoor or outdoor
CAPACITANCE VALUES TO VDE 0675
UN
kV
7.2
12
17.5
24
36
CN
µF
0.5
0.3
0.3
0.3
0.15
Other values of capacitance, voltage or temperature class
are available upon request.
MODE OF OPERATION
STANDARD SPECIFICATIONS
Protection Against Steep-Fronted Voltage Impulses
The capacitors are designed and tested related to
VDE 0560, Part 3. The rated voltage UN of capacitors to be
connected between phases and earth are given in the same
specifications.
Electrical machines connected to overhead lines without
cables or transformers being interposed should be protected
by capacitors (VDE 0675 - Guidelines for Surge Suppression
Equipment). These surge suppressors are connected
inter-turn faults.
Because of their energy storing capability, surge
suppressors reduce the front steepness of voltage impulses
(see Fig. 1).
This flattering effect also avoids any damaging impulse
reflections on the equipment connected.
Moreover, the magnitude of the overvoltage is also reduced
since the impulse entering the winding has a finite ‘virtual
time to half value on the tail’.
In systems with an insulated neutral or earthed through
arc-suppression coils, the rated voltage is UN1 equal to
phase-to-phase voltage Ur, whereas in systems with an
effectively earthed neutral, the rated voltage UN2 is equal to
Ur/√3.
According to VDE 0111, paragraph 6, a system is effectively
earthed if, in the event of a simple earth fault, the voltage of
the healthy phases cannot exceed 80 % of the system
(phase-to-phase) voltage. Not all the transformer neutral
points of the system need to be earthed to achieve this.
In cases of doubt, it is recommended to choose capacitors
whose rated voltage is equal to the system voltage.
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The capacitances stated in the above table have been
calculated so that the front steepness of voltage impulse
entering the winding is reduced to a maximum of 10 %
winding test voltage per µs.
For technical questions, contact: [email protected]
Document Number: 13150
Revision: 10-Jun-08
Description
Vishay ESTA
This value is based on the assumption that the original front
steepness of the impulse is very great and that voltage peaks
are in the range of more than 50 % flashover voltage impulse
for the overhead line insulators. The voltage across the
surge suppressor and the time until - because of the flattering
effect - the voltage becomes a maximum at the terminal can
be seen from Fig. 2.
Both the voltage and time apply to an impulse with a very
steep front and a tail which decreases as an exponential
function.
The charts are based on the expression given below.
TC = C x Z
TC = Time constant of particulat system section
where
C = Capacitance of the protective capacitor
Z = Surge impedance of the overhead line
(500 Ω approx.)
u
2
t
t
------t- = -------------------------- × e – ⎛ --------------- – -------⎞
⎝T – e T ⎠
ˆ
1 – TC ⁄ T0
U
0
C
0
where
ut = Voltage curve on a base at the line terminal
T0 = 1.44 x Tr
where
T0 = Time constant of the exponential decrease
of the incoming impulse
tm
TC
2
----- = -------------------------- × ln -----1 – TC ⁄ T0
T0
T0
where
tm = Time until voltage ut becomes a maximum
at the line terminal
Tr = Virtual time to half value on the incoming
impulses (60 µs approx.)
t
U0 = Û0 x e - t/TO
where
5
2
1
U0 = Incoming impulse on base of time
0.5
Û0 = Peak value of incoming impulse
0.2
T = Time in s
ut
Û0
tm
T0
0.1
0.05
U0
0.02
G
0.01 0.02 0.05 0.1 0.2
ut
C = 0.3 µF
U0
U0 2
Û0
Û0
Û0
1
1
1
0.5
0.5
0.5
1
TR
T0
1
2
5
10 20
2
3
t
T0
50 100
TC
T0
Fig. 2 - Reduction of voltage impulse by a protective
capacitor at a line terminal
U0
0
0.5
3~
z = 500 Ω
0
1
tm
T0
2
3
4
t
T0
0
1
2
3
t
T0
Fig. 1
Document Number: 13150
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
3
Description
Vishay ESTA
Surge arresters used in conjunction with surge suppressor
capacitors operates at a lower instantaneous value of the
voltage than without such capacitors. This is because of the
reduced front steepness of the impulse and the consequently
lessened effect of ‘delayed ignition’.
The obvious advantage is that the machine windings, which
in most cases have weaker insulation than overhead lines,
are better protected.
The machine arresters must, therefore, be designed for
lower impulse and power-frequency sparkover voltages than
the usual arresters.
On the other hand, since they are now likely to operate in the
event of internal overvoltages as well, they must have a
correspondingly higher discharge capacity.
In case of electrical equipment connected to overhead lines
through cables, the capacitance of the surge suppressor
capacitance can be reduced by roughly the amount
corresponding to the operating of the cables.
The inductance’s and capacitance’s of the machines or
transformers connected have little influence on the size of
the protective capacitance’s required, and inquires need
therefore only be made if he zone ahead of the equipment to
be protected is subject to special conditions.
EXAMPLE
Reduction of the voltage impulse on an overhead line by a
surge protection capacitor.
Surge impedance Z of the overhead line: 500 Ω
Capacitance C of the protective capacitors: 0.3 µF
Time constant TC = C x Z = 0.3 x 500 = 150 µs
Virtual time to half value on the tail, Tr, of the incoming
impulse: 50 µs
Thus:
T0 = 1.44 x Tr = 1.44 x 50 = 72 µs
In the case of unloaded generator transformer with a high
transformation ratio (e.g. 110 kV on the higher voltage side),
unduly high power-frequency voltages may be transferred
capacitively to the lower-voltage side (U2C) if an earth fault
occurs on the higher-voltage side. For a single-phase earth
fault, this can be expressed at follows:
C1
U 2C = -------------------- U0
C1 + C2
C1
U0
C2 Trafo
U2
Fig. 3
U0 = Voltage to earth on the higher voltages side
C1 = Capacitance between higher and lower windings of
one transformer phase (1 nF to 10 nF)
C2 = Resulting capacitance of a lower voltage phase
including that of the transformer lower-side to earth
(1 nF to 10 nF), the capacitance of the protective
capacitor and possibly that of a cable connecting the
transformer with the generator and also the
capacitance of the latter
In systems operated with a free neutral or earthed through an
arc-suppression coil, the voltage to earth is equal to the
phase-neutral voltage, i.e.
U0 = UY
ût/Û0 = 0.5 and tm/T0 = 1.4
Whereas in rigidly earthed systems and under the most
favourable conditions:
ût = Voltage curve on a base at the line terminal
It can thus be seen that an incoming impulse with at peak
(Û0) of 1000 kV and a virtual time on half value on the tail (Tr)
of 50 µs is reduced to a peak (Ût) of 500 kV by the capacitor.
Moreover, the voltage impulse ut at the terminal does not
attain its maximum until time Tm = 1.4 x 72 = 100 µs.
This shows that the steepness of the incoming impulse has
been reduced considerably.
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C
TC/T0 = 150/72 = 2.08
From the chart:
where
PROTECTION AGAINST
POWER-FREQUENCY VOLTAGES
TRANSFERRED CAPACITIVELY
2
U 0 = --- U Y
3
Moreover, the lower-side systems voltage U2b is
superimposed on C2C. The maximum phase-to-earth voltage
U2' can thus be expressed as follows:
For technical questions, contact: [email protected]
U 2b
U 2 ′ ~ U 2C ′ + --------3
Document Number: 13150
Revision: 10-Jun-08
Description
Vishay ESTA
Capacitors of low rating. E.g. of 0.075 µF and 0.15 µF, are
best used for reducing power-frequency voltages transferred
capacitively. It does not matter if their capacitance’s are
higher than those calculated since the protection afforded by
these capacitors is higher because of their greater energy
storing capability.
CONNECTION
The surge suppressor capacitors be connected at the
shortest possible distance from the equipment to be
protected.
500 m
G
3~
AL
C
AM
Fig. 4 - Surge suppression scheme for a generator
which feeds an overhead line direct
C = Surge suppressor
AL = Surge arrester on the overhead line
AM = Generator arrester
G
3~
AST
AM
C
Fig. 5 - Surge suppression scheme for a generator which
feeds an overhead line through a transformer.
Capacitors afford protection against powerfrequency voltages transferred capacitively.
AST = Station arrester
Document Number: 13150
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
5
Technical Data
Vishay ESTA
Single Phase Type
SURGE SUPPRESSOR
TYPE
UN
kV
CN
µF
Phaso 12/0.1 µF
0.1
Phaso 12/0.15 µF
0.15
Phaso 12/0.2 µF
0.2
Phaso 12/0.25 µF
12
0.25
Phaso 12/0.3 µF
0.3
Phaso 12/0.4 µF
0.4
Phaso 12/0.5 µF
0.5
Phafso 17.5/0.1 µF
0.1
Phafso 17.5/0.15 µF
0.15
UE
IMPULSE
kV/1 min
kVP
DRAWING
220
40
28
75
345
110
321
75
40
405
220
40
Phafso 17.5/0.2 µF
Phafso 17.5/0.25 µF
0.2
17.5
0.25
38
95
345
Phafso 17.5/0.3 µF
0.3
Phafso 17.5/0.4 µF
0.4
Phafso 17.5/0.5 µF
0.5
110
321
75
40
Dimensions are depending on the losses of the capacitor.
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For technical questions, contact: [email protected]
Document Number: 13152
Revision: 10-Jun-08
Technical Data
Single Phase Type
Vishay ESTA
SURGE SUPPRESSOR
TYPE
UN
kV
CN
µF
Phafso 24/0.1 µF
0.1
Phafso 24/0.15 µF
0.15
UE
IMPULSE
kV/1 min
kVP
DRAWING
220
40
Phafso 24/0.2 µF
Phafso 24/0.25 µF
0.2
24
0.25
50
125
345
Phafso 24/0.3 µF
0.3
Phafso 24/0.4 µF
0.4
Phafso 24/0.5 µF
0.5
US/36/0.1 µF
0.1
110
321
40
75
415
405
220
M12
US/36/0.15 µF
0.15
305
US/36/0.2 µF
36
0.2
70
170
345
40
40
US/36/0.25 µF
0.25
475
M12
US/36/0.3 µF
4 x Ø 18
0.3
200
160
Dimensions are depending on the losses of the capacitor.
Document Number: 13152
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
7
Technical Data
Single Phase Type
Vishay ESTA
RC-SURGE SUPPRESSOR
TYPE
UN
kV
CN
µF
Phaso 12/0.1 µF/...
0.1
Phaso 12/0.15 µF/...
0.15
Phaso 12/0.2 µF/...
0.2
Phaso 12/0.25 µF/...
12
0.25
Phaso 12/0.3 µF/...
0.3
Phaso 12/0.4 µF/...
0.4
Phaso 12/0.5 µF/...
0.5
Phafso 17.5/0.1 µF/...
0.1
Phafso 17.5/0.15 µF/...
0.15
UE
IMPULSE
kV/1 min
kVP
R
Ω
DRAWING
220
40
28
75
10 to 50
345
110
321
75
40
405
220
40
Phafso 17.5/0.2 µF/...
Phafso 17.5/0.25 µF/...
0.2
17.5
0.25
38
95
10 to 50
345
Phafso 17.5/0.3 µF/...
0.3
Phafso 17.5/0.4 µF/...
0.4
Phafso 17.5/0.5 µF/...
0.5
110
321
75
40
Dimensions are depending on the losses of the capacitor.
Earth fault protection (T < 1 min)
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For technical questions, contact: [email protected]
Document Number: 13152
Revision: 10-Jun-08
Technical Data
Single Phase Type
Vishay ESTA
RC-SURGE SUPPRESSOR WITH BUILT IN DAMPING RESISTOR
TYPE
UN
kV
CN
µF
Phafso 24/0.1 µF/...
0.1
Phafso 24/0.15 µF/...
0.15
UE
IMPULSE
kV/1 min
kVP
R
Ω
DRAWING
220
40
Phafso 24/0.2 µF/...
Phafso 24/0.25 µF/...
0.2
24
0.25
50
125
10 to 50
345
Phafso 24/0.3 µF/...
0.3
Phafso 24/0.4 µF/...
0.4
Phafso 24/0.5 µF/...
0.5
RC/36/0.1 µF/...
0.1
110
321
75
415
40
405
220
M12
RC/36/0.15 µF/...
0.15
305
RC/36/0.2 µF/...
36
0.2
70
170
10 to 50
345
40
40
RC/36/0.25 µF/...
0.25
475
M12
RC/36/0.3 µF/...
4 x Ø 18
0.3
200
160
Surge supressor 36 kV consists of: 2 x capacitors unit connected in series
1 x mounting plate
1 x post insulator 36 kV (70 kV/200 kVP)
Dimensions are depending on the losses of the capacitor.
Earth fault protection (T < 1 min)
Document Number: 13152
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
9
Technical Data
Vishay ESTA
Three Phase Type
SURGE SUPPRESSOR
TYPE
UN
kV
Phaso 7.2/3 x 0.25 µF
CN
µF
UE
IMPULSE
kV/1 min
kVP
DRAWING
3 x 0.25
123 123
Phaso 7.2/3 x 0.3 µF
3 x 0.3
Phaso 7.2/3 x 0.4 µF
3 x 0.4
25
55
7.2
20
Phaso 7.2/3 x 0.5 µF
3 x 0.5
Phaso 7.2/3 x 0.6 µF
3 x 0.6
60
345
135
321
40
75
Phaso 7.2/3 x 0.8 µF
3 x 0.8
Phaso 12/3 x 0.1 µF
3 x 0.1
Phaso 12/3 x 0.15 µF
3 x 0.15
Phaso 12/3 x 0.2 µF
3 x 0.2
160
160
55
25
Phaso 12/3 x 0.25 µF
12
3 x 0.25
28
75
450
Phaso 12/3 x 0.3 µF
3 x 0.3
Phaso 12/3 x 0.4 µF
3 x 0.4
Phaso 12/3 x 0.5 µF
3 x 0.5
110
426
75
40
Dimensions are depending on the losses of the capacitor.
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For technical questions, contact: [email protected]
Document Number: 13153
Revision: 10-Jun-08
Technical Data
Three Phase Type
Vishay ESTA
RC SURGE SUPPRESSOR WITH BUILT IN DAMPING RESISTOR
TYPE
UN
kV
Phaso 7.2/3 x 0.25 µF/...
CN
µF
UE
IMPULSE
kV/1 min
kVP
R
Ω
DRAWING
3 x 0.25
123 123
Phaso 7.2/3 x 0.3 µF/...
3 x 0.3
Phaso 7.2/3 x 0.4 µF/...
3 x 0.4
25
55
7.2
20
Phaso 7.2/3 x 0.5 µF/...
3 x 0.5
Phaso 7.2/3 x 0.6 µF/...
3 x 0.6
60
10 to 50
345
135
321
40
75
Phaso 7.2/3 x 0.8 µF/...
3 x 0.8
Phaso 12/3 x 0.1 µF/...
3 x 0.1
Phaso 12/3 x 0.15 µF/...
3 x 0.15
Phaso 12/3 x 0.2 µF/...
3 x 0.2
160
160
55
25
Phaso 12/3 x 0.25 µF/...
12
3 x 0.25
28
75
10 to 50
450
Phaso 12/3 x 0.3 µF/...
3 x 0.3
Phaso 12/3 x 0.4 µF/...
3 x 0.4
Phaso 12/3 x 0.5 µF/...
3 x 0.5
110
426
75
40
Dimensions are depending on the losses of the capacitor.
Earth fault protection (T < 1 min)
Document Number: 13153
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
11
ZORC Description
Vishay ESTA
Zinc Oxide RC-Surge Suppressor (ZORC) for HV-Motor and
Transformers M-Type and Panel Mounting P-Type
DESCRIPTION
APPLICATION
ZORC’s are RC surge suppressors with included varistors.
The technology for the design of the ZORC’s is the same as
for all other capacitors in this catalogue.
ZORC’s are optimised to be mounted inside the motor or
transformer terminal boxes to be connected to each phase
and earth.
ZORC’s will protect transformers and motors from insulation
failures. As all surge transients will be removed at source by
the ZORC’s. The lifetime of transformers and motors will be
increased for many years.
ZORC’s will protect vacuum and other switchgears.
ZORC’s connection diagrams in HV motor circuits:
M
ZORC’s will be inside the curves defined by IEEE and
CIRGRe for motor impulse withstand levels. To reach a
comprehensive insulation coordination, independent what
switching device or switching curve is used (air, vacuum, gas
or oil).
ZORC’s help to reduce costs of down time losses of
transformers and motors and for replacements.
ZORC’s will reduce significant the expenses for maintenance
and insulation failures of motors and transformers, which
user accept as normal.
Fig. 1 - ZORC type M connected to motor terminals
ZORC’s will eliminate connected with vacuum and other
switchgears, all multiple striking (re- and pre-) transients.
M
So ZORC’s prevents high frequency currents at zero in the
contact gap of the switch.
Fig. 2 - ZORC type P connected in switchgear panel
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For technical questions, contact: [email protected]
Document Number: 13151
Revision: 30-May-08
Technical Data
Vishay ESTA
ZORC
TYPE
UN
kV
Zoaso 3.3/0.1 µF/M
3.3
CN
µF
PH
DIMENSION
mm
DRAWING
M10
600
0.1
1
22
22
116
28 40
116 x 72 x 155
177
155
Zoaso 6.6/0.1 µF/M
72
Nm
6.6
68
123
123
Zoaso 3.3/3 x 0.2 µF/P
159
3.3
3 x 0.2
3
345 x 135 x 220
55
382
Zoaso 3.3/3 x 0.2 µF/M
80
220
Zoaso 6.6/3 x 0.2 µF/P
6.6
Zoaso 6.6/3 x 0.2 µF/M
345
170
135
3
170
159
Zoaso 11/3 x 0.2 µF/P
3
80
450 x 110 x 240
55
402
3 x 0.2
240
11
Zoaso 11/3 x 0.2 µF/M
450
110
3
Application:
M = Motor
P = Panel
Document Number: 13154
Revision: 10-Jun-08
For technical questions, contact: [email protected]
www.vishay.com
13
Notes
Vishay ESTA
www.vishay.com
14
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Discrete Semiconductors and Passive Components
S u rge s u ppressor capacitors
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