IEEE DRAFT C57.13-1 : D8.0 2006
Withdrawn
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FIELD TESTING OF RELAYING CURRENT TRANSFORMERS
18-10-2023
12-01-2013
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
Specifies field test methods that assure that current transformers are connected properly, are of marked ratio and polarity, and are in a condition to perform as designed both initially and after having been in service for a period of time.
DocumentType |
Draft
|
PublisherName |
Institute of Electrical & Electronics Engineers
|
Status |
Withdrawn
|
SupersededBy |
IEC 60044-8:2002 | Instrument transformers - Part 8: Electronic current transformers |
IEEE C57.13.3-2014 | IEEE Guide for Grounding of Instrument Transformer Secondary Circuits and Cases |
IEEE C37.92-2005 | IEEE Standard for Analog Inputs to Protective Relays From Electronic Voltage and Current Transducers |
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