Analysis on the reason of the differential protection malfunction of the start & standby auxiliary transformer

Abstract

Abstract: Aiming at a malfunction accident of differential protection of start & standby auxiliary transformer caused by the load grounding fault in Hunan Huadian Changsha Power Generation Corporation Limited, according to the fault record diagram, the protection action report and the practical condition of the accident field, the accident developing procedure and the behavior of the relay protection were analyzed. The fault point was found by experiment. The reason of the malfunction was discovered. And some concrete preventive measures were proposed.

Key words: grounding accident, differential protection of start &, stand-by auxiliary transformer, protection malfunction, differential protection, preventive measure

HUANG Haibo. Analysis on the reason of the differential protection malfunction of the start & standby auxiliary transformer[J]. Huadian Technology, 2009, 31(10): 64-67.

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Analysis on the reason of the differential protection malfunction of the start & standby auxiliary transformer

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