Method for locating fault point of operation failure of residual current protection device in low-voltage distribution line

Abstract

The invention discloses a method for locating a fault point of an operation failure of a residual current protection device in a low-voltage distribution line, which improves fault point location efficiency and shortens location time. The method comprises the following steps: judging whether the residual current protection device is at fault; if not, judging whether a phase line and a neutral line of a low-voltage distribution line are at fault; and carrying out rapid judgment and location on the fault point according to the golden section method. The method disclosed by the method takes fulluse of the function of a residual current clamp meter.

Description

technical field [0001] The invention relates to a method for finding faults in low-voltage power distribution lines, in particular to a method for quickly finding leakage fault points by analyzing the reasons why residual current protection devices cannot be put into operation in low-voltage distribution networks. Background technique [0002] Installing a residual current protection device is an effective measure to prevent fault hazards caused by residual current in the low-voltage power grid. According to DLT499 "Rural Low-Voltage Electric Power Technical Regulations", most of my country's vast rural low-voltage power networks adopt TT system low-voltage distribution line outlets must be equipped with residual current protection devices. As far as the current situation is concerned, the insulation level of the rural power grid is poor, the user awareness is weak, and the residual current is too large, which often causes the device to fail to be put into operation and affe...

AI Technical Summary

Problems solved by technology

As far as the current situation is concerned, the insulation level of the rural power grid is poor, the user awareness is weak, and the residual current is too large, which often causes the device to fail to be put into operation and affects the normal power supply operation of the line

[0003] At present, the operation and maintenance of the residual current protection device at the outgoing end of the low-voltage distribution line accounts for a large proportion of the daily workload of the power supply station. Once the device operates, the power supply party will reduce the reliability of the power supply, reduce the power supply, and increase the maintenance cost.

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