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IEEE Guide for Field Testing of Relaying Current Transformers
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Available format(s): PDF
Superseded date: 26-08-2019
Language(s): English
Published date: 28-02-2007
Publisher: Institute of Electrical & Electronics Engineers
1 Overview 1.1 Scope 1.2 Purpose2 Normative references3 Definitions4 Consideration of American National Standards Institute (ANSI) accuracy classes5 Precautions in field testing CTs 5.1 Demagnetizing CTs 5.2 Greater primary winding turns6 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 test7 AC sources for primary current injection tests8 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 method9 Polarity test 9.1 DC voltage test 9.2 AC voltage test-oscilloscope 9.3 Current method 9.4 Phase angle method10 Insulation resistance tests11 Winding and lead resistance (internal resistance)12 Excitation test13 Admittance test14 Burden tests15 Burden measurements16 Specialized situations 16.1 CT in a closed-delta transformer connection 16.2 Generator CTs 16.3 Inter-core coupling checkAnnex A (informative) Wiring integrity, test switches and test equipment A.1 Wiring integrity A.2 Test switches A.3 Test equipmentAnnex B (informative) Excitation voltage measurement considerations B.1 Why average? B.2 Typical test results B.3 Effect of source impedance B.4 Waveform simulationAnnex 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 systemsAnnex D (informative) Bibliography
Specifies field test methods that assure current transformers (CTs) are connected properly, are of marked ratio and polarity, and are in a condition to perform as designed both initially and after being in service for a period of time.
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