Analysis on tripping of main transformer differential protection caused by fault in cross point of lines

Huadian Technology ›› 2012, Vol. 34 ›› Issue (12): 56-57.

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Analysis on tripping of main transformer differential protection caused by fault in cross point of lines

ZHU Shaotang

Wuwei Power Supply Company, Wuwei 733000, China

Received:1900-01-01 Revised:1900-01-01 Online:2012-12-25 Published:2012-12-25

Abstract

Abstract: A breakdown accident occurred in the cross point of the 110kV line and the 35kV line of a substation and caused that the main transformer differential protection skiplevel tripped, a grounding fault occurred in the outside B phase and a lightning arrester breakdown accident occurred in internal C phase. Combining with the tripping report and the waveform, using the fault sequence component analysis method, the reasons of the accident were analyzed, and the improvement scheme was proposed to prevent similar accident.

Key words: single phase grounding, lightning arrester breakdown, differential protection, power transmission line

ZHU Shaotang. Analysis on tripping of main transformer differential protection caused by fault in cross point of lines[J]. Huadian Technology, 2012, 34(12): 56-57.

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Analysis on tripping of main transformer differential protection caused by fault in cross point of lines

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