7020-01040-0 - Murata Power Solutions

DMS Accessories
5 Amp AC Current Transformers
General Specifications (all models)
Insulation Class
Frequency Range
Supplied Secondary
Leads
Max. Secondary Lead
Length
Rated Accuracy
Burden
UL FIle No.
CSA File No.
Weight
600V, 10kV BIL full wave~
50-400Hz
Flexible conductors, 24"
(61cm) 16AWG (1.8mm2),
UL Style 1015, 105°C
See Table 1 and technical
note 5
See Table 1 and
technical note 6
See Table 1
E93779
LR89403
1.0 lbs. (454g)
~ Basic Lightning Impulse Insulation Level (BIL): The insulation
strength referenced to the crest value of an impulse voltagewaveform which rises to a crest value in 1.2 microseconds, then
drops to ½ the crest value in 50 microseconds.
AC POWER
SUPPLY
ACA5-20PC-X-ACX
A
These commercial grade, UL & CSA recognized, “donut style” AC current-transformers
(CT) provide an isolated 0-5A output that can be used with DATEL’s ACA5 Series of digital
ammeters. Installation is straightforward: simply pass the load-carrying conductor through
the 5A CT’s primary window, and then route its secondary’s leads through the ACA5-ammeter’s built-in, low-burden, toroid sensor.
All models feature rugged, fully insulated construction, allowing continuous operation
with primary voltages up to 600Vac, at line frequencies from 50 to 400Hz. Fourteen models
are available to enable accurate measurements from 50A through 2000A. When combined
with DATEL’s ACA5 Series ammeters, secondary lead-extensions may be used for those
applications where the CT cannot be installed in the immediate vicinity of the ammeter.
TECHNICAL NOTES
IMPORTANT! To ensure safe and reliable operation, Current Transformers and associated equipment must be installed and serviced by qualified technical personnel.
Never open the CT’s secondary connections while the primary is energized. Open
CT secondary wiring can generate potentially lethal voltages when the primary circuit is energized. Contact DATEL if you have any doubts regarding the installation
or operation of any of our ac-mains measurement instruments and accessories.
1. CT Precautions: In normal operation, a 5A current transformer’s secondary circuit
operates at a relatively low voltage due to its closed-loop, low burden configuration
(essentially zero Ohms when used with DATEL’s ACA5 series ammeters). However, any
CT can generate potentially lethal voltages if its output current is suddenly interrupted. For
example, loose secondary connections can produce a condition referred to as “inductive
kick.” Inductive kick can generate extremely high voltages across the open secondary
connections.
B
TB1
Therefore, all connections made to a CT’s secondary leads must only be performed with
zero current flowing in the primary circuit. Never operate a CT with its secondary circuit
open and current flowing in the primary.
TO AC LOAD
L1
5A CURRENT
TRANSFORMER
(see technical notes)
0-5A
OUTPUT
Figure 1. Typical Connections
2. CT Connections and Grounding: Some applications require connecting one of the CT’s
5A output terminals to earth/chassis ground. In the USA, consult the latest revision of the
National Electrical Code for more information.
After all mechanical assembly is completed, pass the 5A secondary leads through the
ACA5 ammeter’s built-in toroid, then connect the two leads together as shown in Figure
1. For this connection, and for connections involving lead extensions, pressure-style
connectors (commonly called “wire nuts”) are acceptable as long as they are rated for the
currents and voltages involved.
3. Installation: CT’s must be installed in a manner that ensures no excessive stresses are
applied to the primary conductor that passes through the CT or to the secondary circuit
and its associated instruments. Use plastic tie-wraps and/or other suitable non-conductive
restraining devices to secure the CT.
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MPM_DMS-CT.A01 Page 1 of 4
DMS Accessories
5 Amp AC Current Transformers
TECHNICAL NOTES
4. Reference Documentation: Prior to connecting CTs to any measurement device (analog or digital), relay, or other apparatus, be sure to
thoroughly review the applicable device’s technical documentation (for
example, DATEL’s ACA5-20PC product data sheet). In particular, make
sure the CT’s ratings meet the requirements of your application.
5. Secondary Lead Extensions: When calculating the total burden
imposed on a CT’s 5A output, DATEL’s ACA5 digital ammeters’ input
impedance is negligible and can be assumed to be zero Ohms. In
many applications, the length of secondary wiring can be increased up
to the value specified in Table 1 without adversely affecting performance.
In order to achieve the specified accuracy, the maximum permissible
burden must not exceed the value shown in Table 1. When used with
ACA5 ammeters, the total burden is the sum of the resistance of the
CT’s 24” leads and any lead-extensions. Make sure all connections
are securely tightened and properly strain relieved. If terminal blocks
are used for intermediary connections, refer to the manufacturer’s
torque recommendations.
Table 1 lists general guidelines for adding lead extensions when using
DATEL’s ACA5-Series ammeters as the readout device. The lengths in
Table 1 assume the lead extensions are 16AWG. Stated dimensions
are one-way distances between the ACA5 and the CT. Make sure all
secondary extensions meet or exceed the specifications of the CT’s
built-in leads. In order to minimize external noise pick up, lead extensions should be as kept short as possible.
burden column. Accuracy measurements are taken at 100% primary
current, using a resistive burden and a nominal line frequency of 60Hz.
7. Polarity: CTs are marked with ‘H1’ (primary) and ‘X1’ (secondary)
polarity indicators. When a CT’s only function is to measure amperes,
polarity markings can be disregarded. However, correct polarity is
mandatory in applications in which the phase relationship between
two currents is involved (watt or watt-hour meters are two examples
of polarity sensitive applications). Refer to the respective instruments’
documentation for more information.
8. Thermal Rating Factor: The thermal rating factor denotes the amount
by which the primary current can be increased on a continuous
basis over its rated value without exceeding the CT’s maximum
temperature rise.
The formula below can be used to calculate thermal rating factors at
temperatures above 30°C.
(85 - NAT)(RF) 2
NRF =
NAT
NRF = Rating Factor at New Ambient Temperature
RF = 30°C Rating Factor
NAT = New Ambient Temperature
Example: Find the 55°C. thermal rating factor of a 2000:5 CT whose
30°C rating factor is 2.0
(85 - 55)(2) 2
6. Accuracy: The indicated accuracy specifications are valid as long
as the total secondary burden does not exceed the value in Table 1’s
NRF =
55
= 1.48
Table 1. Selection Guide
DATEL Part No.
7020-01036-0
7020-01037-0
7020-01038-0
7020-01039-0
7020-01040-0
7020-01041-0
39-3681407*
39-3681408*
39-3681409*
7020-01042-0
7020-01043-0
7020-01044-0
7020-01045-0
7020-01046-0
*
Current Ratio
(Amps)
50:5
75:5
100:5
150:5
200:5
250:5
300:5
400:5
500:5
600:5
750:5
1000:5
1500:5
2000:5
Accuracy
(@ 60Hz)
±2%
±2%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
Burden
VA (Ohms)
1.5 (0.06)
3.0 (0.12)
3.0 (0.12)
6.0 (0.24)
8.0 (0.32)
10.0 (0.40)
12.5 (0.50)
12.5 (0.50)
20.0 (0.80)
10.0 (0.40)
10.0 (0.40)
10.0 (0.40)
12.5 (0.50)
15.0 (0.60)
Lead Ext.
Feet (Meters)
4 (1.2)
10 (3.0)
10 (3.0)
20 (6.1)
30 (9.1)
40 (12.2)
50 (15.2)
50 (15.2)
80 (24.4)
40 (12.2)
40 (12.2)
40 (12.2)
50 (15.2)
60 (18.3)
Thermal Rating Factor
(@30°C)
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.0
2.0
2.0
2.0
2.0
Not RoHS Compliant
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-CT.A01 Page 2 of 4
DMS Accessories
5 Amp AC Current Transformers
MECHANICAL SPECIFICATIONS
1.42 (36.1)
X1
2.69
(68.3)
1.25
(31.8)
DIA
Models: 7020-01036-0 – (50:5)
7020-01037-0 – (75:5)
7020-01038-0 – (100:5)
7020-01039-0 – (150:5)
7020-01040-0 – (200:5)
7020-01041-0 – (250:5)
H1
1.10 (27.9)
X1
3.56
(90.4)
1.56
(39.6)
DIA
Models: 39-3681407 – (300:5)
39-3681408 – (400:5)
39-3681409 – (500:5)
H1
1.13 (28.7)
X1
4.50
(114.3)
3.00
(76.2)
DIA
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H1
Models: 7020-01042-0 – (600:5)
7020-01043-0 – (750:5)
7020-01044-0 – (1000:5)
7020-01045-0 – (1500:5)
7020-01046-0 – (2000:5)
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-CT.A01 Page 3 of 4
DMS Accessories
5 Amp AC Current Transformers
USA:
Mansfield (Ma), Tel: (508) 339-3000, email: [email protected]urata-ps.com
Canada: Toronto, Tel: (866) 740 1232, email: [email protected]
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: [email protected] ISO 9001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2008 Murata Power Solutions, Inc.
www.murata-ps.com
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany: München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
Website: www.murata-ps.jp
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Technical enquiries email: [email protected], tel: +1 508 339 3000
MPM_DMS-CT.A01 Page 4 of 4