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| METHOD OF SINGLE PHASE GROUNDING FAULT LOCATION FOR RAILWAY POWER SUPPLY LINE |
| WEI Tian-kui1, WANG Zhang-qi1, SHEN Xiang-yu2, LIU Chun1 |
| 1Huazhong University of Science & Technology; 2Wuchang electric control equipment co. Ltd Company |
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Abstract Research purpose: According to many statistic of electric power faults, upwards of 80 percent are single phase grounding fault among all faults. In order to locate and isolate the fault rapidly, improve the reliability of railway power supply line.
Research method: This article analyzed the distributing of zero sequence current when single phase grounding fault occurred along the circuitry. A fault location method based on General Matrix Arithmetic is proposed for railway power supply line, and the method is validated.
Research result: The method composes a distributed system made up by STU, FTU and supervise terminal. Abandoned the previous method, which locates faults by examining the zero sequence voltage and comparing the zero sequence current of each line in the electrical power station, use the zero sequence current of each switchgear spot only.
Research conclusion: In condition of laboratory, the new method can locate and isolate faults within 10 seconds, it can provide reliable gist for fault lookup and elimination.
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Received: 12 November 2005
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2006, Vol. 23 
