Analysis of Anomaly Caused by Two-point Grounding of Secondary Circuit in a Substation
At present,use of self-produced zero sequence voltage is prevailing in line protection principle.Importance of the opening triangle of voltage transformer is decreasing,and insulation of its voltage secondary circuit may also be despised.This paper reports a case of two-point grounding faults of the secondary opening triangle in a substation,and analyzes the causes of voltage fluctuations and abnormalities of different protections,which is valuable for the subsequent identification of similar faults.
voltage transformersecondary opening triangletwo-point grounding
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