Protective Relay Testing â€“Modified Secondary Injection Method
Keywords:Protective relay testing, Secondary injection method, Multiple secondary winding CT, Continuity test
Secondary injection method is used to test the reliability of protective relays and circuits. To avoid any loose connection in the protective relay circuit a continuity test may be carried with DC voltage. But this test is unable to identify any short circuit in the CT secondary. The continuity test should also be carried out with AC voltage to identify any short circuit in the CT secondary or shorting of any other secondary terminals of multiple secondary winding CT.Â The addition of this low-cost test in the secondary injection method improves the reliability of the protective circuit to a high level.
Relay testing and commissioning (Online). Available:
Testing of Electromechanical Protective Relays (Online). Available:
Operation, Maintenance, and Field Test Procedures for Protective Relays and Associated Circuits
(Online) Available: http://www.usbr.gov/power/data/fist/fist3_8/vol3-8.pdf
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