DC earth electrode line fault location method

Abstract

The invention discloses a DC earth electrode line fault location method. The method comprises the following steps: S10) injecting a pulse signal to a line from a neutral bus end to an earth electrode end at a preset time interval, and receiving a reverse pulse signal and a fault transient traveling wave signal at the neutral bus end; S20) calculating the distance between a fault point and the neutral bus end under the pulse signal; S30) according to the section, where the fault point locates, under the pulse signal and the propagation path of the fault transient traveling wave, calculating the stroke of the fault transient traveling wave received twice, and calculating the distance between the fault point and the neutral bus end under the fault transient traveling wave; and S40) for the distance between the fault point and the neutral bus end under the pulse signal and the distance between the fault point and the neutral bus end under the fault transient traveling wave, obtaining the arithmetic mean value of the two as an approximate position of an actual fault point. The fault location method can locate the fault point quickly and accurately, reduce fault line repair time and is of great significance to reducing outage rate of the whole DC transmission system.

Description

technical field [0001] The invention relates to the field of power line fault detection, in particular to a distance measuring method for a DC grounding electrode line based on pulse injection signals and fault transient traveling waves. Background technique [0002] With the rapid development of China's economy, electricity consumption has been increasing year after year. The use of high-voltage direct current transmission is of great significance to the actual application and allocation of resources and energy in my country. The DC ground electrode line is an important part of the HVDC transmission system. It not only provides a return path for DC current, but also can use the ground electrode-earth as the current return method to reduce system loss during unipolar operation. The failure of the grounding electrode line will affect the DC bipolar system, and in severe cases, it will cause bipolar outage, which not only affects the safe operation of the DC system, but also a...

AI Technical Summary

Problems solved by technology

The traveling wave method is divided into single-end traveling wave ranging method, double-ended traveling wave ranging method and pulse signal injection method in a broad sense. The single-ended traveling wave ranging method has high accuracy, but it is difficult to take into account the reliability; The terminal traveling wave ranging method has high reliability but poor accuracy

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