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Abstract A new method using electromagnetic voltage transformers to transfer transient travelling waves is proposed to locating the line faults and identifies the faults type in neutral non-effective grounding system. Analysis model of electromagnetic voltage transformers for analyzing transform characteristics of traveling waves is built, and the transform characteristics is studied using parameters of practical voltage transformers. The results show that electromagnetic voltage transformers can transfer traveling waves surge effectively and meeting the needs of fault location. The transform characteristics and rules of travelling waves for three-phase electromagnetic voltage transformers are analyzed. The results show that there are certain rules for the transient traveling waves of single-phase earth fault and various short-circuit faults transferring to the secondary side of electromagnetic voltage transformers. On this basis, the principle and method that using the signals measured in the secondary side of electromagnetic voltage transformers to locate line faults point and judge the type of fault is proposed. Experimental tests verify the feasibility and correctness of the proposed method.
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Received: 16 November 2010
Published: 20 March 2014
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2012, Vol. 27 
