A ground fault location method for overhead lines in distribution network

Abstract

The invention relates to an overhead wire grounding fault locating method for the power distribution network. An overhead wire grounding fault detecting system for the power distribution network comprises power distribution wires, a command center and grounding detecting devices. A plurality of pylons are arranged on 10kV distribution wires between transformer substations at intervals, and the grounding detecting devices are uniformly arranged on the power distribution wires between the transformer substations. The overhead wire grounding fault locating method includes steps of (1) grounding of the power distribution wires; (2) unbalancing of zero-sequence current; (3) transmitting signals to the command center through a signal transmitting module by a processor; (4) displaying at the command center; (5) acquiring accurate fault position. The system adopted in the detecting method is simple in structure, low in equipment cost, easy to erect and implement and accurate to detect and judge. Besides, interferences of branch circuits and the like are avoided, locating and judging time can be effectively shortened, labor is saved, fault maintenance time is greatly shortened, and consumption and loss of power equipment are reduced.

Description

technical field [0001] The invention belongs to the technical field of electric power facilities, in particular to a method for locating a grounding fault of an overhead line of a distribution network. Background technique [0002] Due to the influence of the natural environment and other factors, it is unavoidable for transmission and distribution lines to have faults such as cable damage and foreign objects attached, especially on 10kV power distribution overhead lines, where single-phase grounding is the most likely to occur. At present, for this kind of fault, the power maintenance personnel must first determine the location of the ground fault. For shorter lines, personnel can be arranged to conduct a comprehensive inspection along the line, but it is more difficult to find the ground point for long overhead distribution lines. At present, you can choose The grounding line selection method adopted, such as volt value judgment method, power direction method, first wave j...

AI Technical Summary

Problems solved by technology

Due to the size limit of the zero-sequence current transformer, it is generally installed in the 10kV outlet cabinet of the substation. For overhead lines, it is difficult to install directly because the distance between the phase conductors is relatively long.

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