Method for inspecting single-phase earth fault point of power distribution network

Abstract

The invention discloses a method for inspecting a single-phase earth fault point of a power distribution network. The method includes the following steps: (1) injecting a test current signal and current detection: inspecting a signal source through a single-phase earth fault, respectively injecting the test current signal with the current value of A1 into three phase lines of the inspected power distribution network in sequence, and adopting a current detection device to synchronously conduct current detection and record detection results when the test current signal is injected into any phase line; (2) judging the existence of the single-phase earth fault: analyzing the detection results recorded in the step one; (3) determining fault sections: comparing the current on the left side and the current on the right side of a signal injecting point on the detected fault phase line, and determining the fault sections of the fault phase line according to the comparative results. The method is simple in step, easy and convenient to operate, low in input cost, low in workload, low in working difficulty, good in using effect and capable of solving a plurality of problems in an existing method for inspecting the single-phase earth fault point.

Description

Technical field [0001] The invention belongs to the technical field of single-phase grounding fault inspections of power distribution networks, and particularly relates to a method for patrolling single-phase grounding faults of power distribution networks. Background technique [0002] With the development of society, the increasing power consumption also puts forward higher requirements on power quality. Power supply reliability has attracted more and more attention from the power sector and power users. Statistics show that more than 95% of power outages in the power grid are caused by power distribution failures. After a fault occurs, how to quickly and effectively detect the fault, isolate it, restore the power supply, and reduce the impact of the fault is of great significance. [0003] When a transient ground fault occurs in a small current grounding system, the arc can be automatically extinguished, and no fault location is required. When a permanent ground fault occurs, s...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a single-phase ground fault point inspection method of distribution network in view of the above-mentioned deficiencies in the prior art. The method has simple steps, easy operation, low input cost, small workload and difficult work Low cost, good use effect, can effectively solve the problems of complex operation, heavy workload and poor use effect existing in the existing inspection method of single-phase ground fault point

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