Research on Fault Location Methods for Single Line-to-Ground Faults in Neutral Unearthed System

J. Tong, X. Nan, and Z. Li (PRC)


Neutral unearthed system; Fault-location; Single line-to ground fault; Credibility analysis; Zero-sequence current


With the increasing requirement of reliability in the power system, the method to fault location without power-cut has been a research focus. In this paper, zero-sequence current has been analyzed when single line-to-ground fault occurs. The zero-sequence component of load currents in the secondary side is studied to evaluate its effect on the measurement of zero-sequence current. After this, the fault-location method based on the zero-sequence current is presented and its credibility curves are given.

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