A method for single-phase-to-earth fault location in distribution network based on zero-sequence voltage

Abstract

A power distribution network one-phase grounding fault location method based on a zero sequence voltage belongs to a power distribution network grounding fault location method. The fault location method starts from an overall zero sequence parameter of a single-end radial medium voltage power distribution network, analyzes a one-phase grounding fault while taking a distributed parameter model influence into consideration, measures a steady-state zero sequence voltage value and a zero sequence current of each feeder line at a bus position and at a tail end of each outlet line, and finds zero sequence voltage variation characteristics of a fault feeder line and non-fault feeder line. According to the invention, a large number of existing devices are used, the data sampling requirement is low in terms of being real-time, and the method of the invention is easy to realize; the simulation model analysis is established according to the actual parameters, so that the fault location can be realized in the system in which the neutral point is not grounded or the neutral point is grounded through an arc suppression coil; the precision is quite high; and the location method of the invention can be applied to the medium and low voltage power distribution network.

Description

Technical field: [0001] The invention relates to a method for distance measurement of a distribution network ground fault, in particular to a method for distance measurement of a distribution network single-phase ground fault based on zero-sequence voltage. Background technique: [0002] The safe operation of the distribution network provides an important guarantee for social production and life. Once a major failure occurs, the economic loss is difficult to estimate. Therefore, fast and accurate fault location is very important to the economy, safety and reliability of the power system. The single-phase-to-ground fault has the highest probability of occurrence in the distribution network. [0003] With the development of distribution network automation technology, installing a new type of distribution switch with measurement and communication functions on the feeder can obtain a large amount of line power information, and then use the principle of electrical network graph ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a single-phase ground fault distance measurement method in distribution network based on zero-sequence voltage, which can solve the problem of single-phase ground fault distance measurement caused by complex line structure, many branches and short line distance in distribution network. big error problem

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