IEEE DRAFT C57.13-1 : D8.0 2006
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A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
FIELD TESTING OF RELAYING CURRENT TRANSFORMERS
10-18-2023
01-12-2013
1 Overview
1.1 Scope
1.2 Purpose
2 Normative references
3 Definitions
4 Consideration of American National Standards Institute
(ANSI) accuracy classes
5 Precautions in field testing CTs
5.1 Demagnetizing CTs
5.2 Greater primary winding turns
6 Types of tests and measurements
6.1 Ratio test
6.2 Polarity test
6.3 Insulation resistance test
6.4 Resistance measurement
6.5 Excitation test
6.6 Admittance test
6.7 Burden test
7 AC sources for primary current injection tests
8 Ratio tests
8.1 Voltage method
8.2 Out-of-service current method
8.3 In-service current manual method
8.4 In-service current automated method
9 Polarity test
9.1 DC voltage test
9.2 AC voltage test - oscilloscope
9.3 Current method
9.4 Phase angle method
10 Insulation resistance tests
11 Winding and lead resistance (internal resistance)
12 Excitation test
13 Admittance test
14 Burden tests
15 Burden measurements
16 Specialized situations
16.1 CT in a closed-delta transformer connection
16.2 Generator CTs
16.3 Inter-core coupling check
Annex A (informative) Wiring integrity, test switches and
test equipment
A.1 Wiring integrity
A.2 Test switches
A.3 Test equipment
Annex B (informative) Excitation voltage measurement considerations
B.1 Why average?
B.2 Typical test results
B.3 Effect of source impedance
B.4 Waveform simulation
Annex C (informative) Optical current sensor systems
C.1 Components of optical current sensor systems
C.2 Why optical sensor systems are used - characteristics
and benefits
C.3 Conventional transformers characteristics and issues
that are not applicable in the field testing of
optical current sensors
C.4 Field testing of optical current sensor
C.5 Maintenance/routine testing of optical sensor systems
Annex D (informative) BIBLIOGRAPHY
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