Method for searching leakage fault point by using bypass current of neutral line of low-voltage power supply line

Abstract

The invention provides a method for searching a leakage fault point by using a bypass current of a neutral line of a low-voltage power supply line, and relates to the technical field of power supply system low-voltage power supply line fault processing. The method comprises the following steps of: S1, measuring a neutral line current IL2 at a line outgoing switch of a disconnected I loop; S2, measuring a neutral line current at the middle position of the I loop, if the neutral line current is far less than the IL2 value, indicating that the fault point is at nearly half of the line, and if the neutral line current is close to the IL2 value, indicating that the fault point is behind the position; and S3, after the fault section is locked according to the method, directly measuring a current of a service conductor and a house-service conductor loop, and finding the fault point. According to the method, complex equipment is not needed, fault points can be safely and conveniently found after power failure, meanwhile, the problem of mutual influence of outgoing line loops of the leakage protector is explained, and the trouble of frequent power failure of a transformer area caused by blind trial transmission during power transmission of people is prevented.

Description

technical field [0001] The invention relates to the technical field of fault handling of low-voltage power supply lines in power supply systems, in particular to a method for finding leakage fault points for neutral line bypass currents of low-voltage power supply lines. Background technique [0002] It is a big problem to find the leakage fault point after the protector trips due to the leakage of the lines in the rural power supply station area (including the customer line and the electrical appliances). Generally, a megohmmeter is used to find the insulation shaker, but it is limited to only measuring The client line part, otherwise you have to disassemble the line connection point, which is very troublesome and time-consuming; now everyone generally uses forced power transmission, and uses a high-resolution clamp ammeter to measure the leakage current, and can only measure the insulated household line and the following parts, because It is very unsafe to disable the leak...

AI Technical Summary

Problems solved by technology

[0002] It is a big problem to find the leakage fault point after the protector trips due to the leakage of the lines in the rural power supply area (including the customer line and the electrical appliances). Generally, a megohmmeter is used to find the insulation shaker, but it is limited to only measuring The client line part, otherwise you have to disassemble the connection point of the line, which is very troublesome and time-consuming; now everyone generally uses forced power transmission, and uses a high-resolution clamp ammeter to measure the leakage current, and can only measure the insulated household line and the following part, because It is very unsafe to disable the leakage protection function of the line

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