Power transmission line single-phase grounding fault positioning method and system thereof

Abstract

The invention provides a power transmission line single-phase grounding fault positioning method and a system thereof, wherein the method comprises the steps of acquiring a voltage signal of three-phase power on the power transmission line by a detecting terminal, performing phase-mode transformation on the voltage signal, and obtaining zero-mode voltage; on the condition that the zero-mode voltage is not equal with a first preset threshold, transmitting the zero-mode voltage to an upper computer; if the zero-mode voltage is higher than a second preset threshold and gradient of a traveling wave front which corresponds with the zero-mode voltage is higher than a third preset threshold, calculating a distance between a fault point and the detecting terminal by the upper computer by means ofa travelling wave attenuation method; and determining the position of the single-phase grounding fault according to the distance between the fault point and the detecting terminal. According to the method of the invention, the position of the single-phase ground fault is fixed by means of a zero-mode voltage traveling wave attenuation characteristic; easy identification and relatively high precision of the zero-mode voltage travelling wave front are realized; the fault position can be quickly found for eliminating a hidden trouble; and a problem of low positioning precision caused by relatively weak to-be-detected amount in a traditional positioning method is settled.

Description

technical field [0001] The present application relates to the technical field of single-phase ground fault location of distribution lines, in particular to a single-phase ground fault location method and system of distribution lines. Background technique [0002] my country's medium-voltage distribution network plays an important role in distributing electric energy in the power network. The medium-voltage distribution network is composed of distribution lines, towers, distribution transformers, isolating switches, reactive power compensators and some auxiliary facilities. Among them, Distribution lines are mainly overhead lines. Because overhead lines are prone to ground faults, the reliability of power distribution in the distribution network is reduced. [0003] Among various types of ground faults, single-phase ground faults are more common. In order to increase the reliability of power distribution in the distribution network, it is necessary to locate the location of ...

AI Technical Summary

Problems solved by technology

[0005] This application provides a single-phase ground fault location method and system for distribution lines to solve the problem of low positioning accuracy due to weak detection quantities in existing single-phase ground fault location methods

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