Fast Location Technology of Single Phase Grounding Fault of the Line Based on Very Low Frequency Ground Current
Finding the ground fault point of low-voltage distribution network has always been a trouble for the op-eration of distribution network.Failure to locate the ground fault quickly leads to many problems such as delay of emergency repair and frequent power transmission failure,which reduces the reliability of safe operation of the system.Based on the research of single-phase grounding fault,a fast grounding search technology based on very low frequency(VLF)ground current is proposed.This technology has the characteristics of high detection accu-racy,no interference from cable capacitance effect and from electric field of high-voltage line in the same tower,verifiable line insulation level,dual protection against misoperation,etc.By applying the controllable safety VLF signal at the fault,the signal current is detected by the wireless digital insulation VLF clamp meter,and the fault point is quickly located.
low-voltage distribution networkvery low frequcenay ground currentsingle-phase grounding fault of the linefast location
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