Single Phase Grounding Fault Location Method based on the Change of the Zero Sequence Current Along with Compensation Degree

Abstract

Single phase grounding faults occur frequently in distribution networks, which is hard to detect and locate especially those faults grounded via high impedance. This paper proposes a single phase grounding fault location method based on the change of steady state zero sequence current along with the compensation degree. Firstly, the distribution law of zero sequence current along the line for the single phase grounding fault in ungrounded system is analyzed. The correlation of the zero sequence current change with the compensation degree is also analyzed. Then the method of distinguishing grounded fault and disconnection fault is obtained. Finally, the fault location process is summarized. The simulation results show that the correctness of the location principle is not affected by the grounding impedance and the number of grounding lines.