Power distribution network line fault positioning method and system

Abstract

The invention provides a power distribution network line fault positioning method and system. When a power distribution network fails, a pulse voltage signal is generated. The apparent discharge capacity detected by a partial discharge detection sensor closest to a fault point o is maximum, the detected maximum apparent discharge capacity qx and the corresponding position x are then analyzed, detection positions y and z on two sides of the position x, the apparent discharge capacity qy which is detected at the position y, and the apparent discharge capacity qz which is detected at the positionz are found out, whether the fault point o is located between the position x and the position y or between the position x and the position z is judged according to QX, QY, QZ, a distance between theposition x and the position y of prestored pulse voltage signals and an attenuation coefficient between the position x and position z ofin the propagation process;, a distance from the fault point o to the position x is calculated according to the pre-stored distance between the position x and the position y and the distance between the position x and the position z, and positioning of the fault is completed. The method is advantaged in that online distance measurement and fault positioning can be rapidly and accurately realized.

Description

technical field [0001] The present application relates to the technical field of power grid fault detection, in particular to a fault location method and system for distribution network lines. Background technique [0002] As a supply-demand link connecting the transmission network and power users, the distribution network has the characteristics of many changes in line structure and complex fault conditions. Line faults will seriously affect the safe and stable operation of the power grid. The most common faults in distribution lines are single-phase ground faults and For latent faults, accurate fault location is the key technology to reduce power outage time and speed up power supply restoration. How to improve the fault location speed and reduce the difficulty of fault location is an urgent problem to be solved by those skilled in the art. [0003] At present, the commonly used fault location methods are: The first method: use the recording signal and fault briefing infor...

AI Technical Summary

Problems solved by technology

[0005] This application provides a distribution network line fault location method and system to solve the technical problem of accurately determining the location of the fault in the distribution network

Images