Cause Analysis and Handling of Abnormal Tripping of 500 kV Main Transformer
This paper focuses on a three-phase short circuit fault which was encountered by a 6 kV switch in an actual power plant and caused undesired action of the differential instantaneous trip relays of the 500 kV main transformer and the high voltage auxiliary transformer.It discusses the optimization scheme for parameter tuning of the differential instan-taneous trip relays of the main transformer and the high voltage auxiliary transformer with respect to different protection calculation methods.It also proposes measures to prevent undesired action of the differential instantaneous trip relays and to improve selectivity of relays'action.The paper provides useful information for coping with similar problems.
transformerdifferential instantaneous trip relaythree-phase short circuit
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