A fault location method and system based on transient traveling waves in a short time window

Abstract

The invention discloses a fault location method and a system based on transient travelling waves within a short time window. The method comprises the steps of acquiring the data of travelling waves at the two ends of an electric transmission line before the occurrence of a fault, and subjecting the data to signal power-frequency fitting treatment to obtain an accurately fitted function value; calculating a voltage modulus or a current modulus at a fault point according to the data of traveling waves; according to the accurately fitted function value, conducting the Karen bell transform treatment and the data alignment treatment to obtain accurate and synchronized data values; according to accurate and synchronized data values, conducting the wavelet transform treatment to extract the time difference between modulus maximum values for fault location, and finally obtaining an accurate fault location value. According to the method provided in the invention, the data of traveling waves are subjected to the signal fitting and data alignment treatment, so that the travelling wave-based fault location does not rely on the time information of GPS timing equipment. The limitations of the GPS timing equipment are overcome. Therefore, the method and the system can greatly improve the reliability of transient travelling wave-based fault location, so that fault location results are more accurate.

Description

technical field [0001] The invention relates to the technical field of traveling wave double-terminal fault distance measurement in power grids, in particular to a fault distance measurement method and system based on transient traveling waves within a short time window. Background technique [0002] Because high-voltage transmission lines pass through remote areas such as mountains, forests, and hills, the geographical environment is complex and prone to failure. The factors that cause failures generally occur in wildfires, snowstorms, lightning, pollution, ice, etc., and most of them have no obvious signs of damage, making it very difficult to manually find the fault point. Fast and accurate fault location can speed up the recovery of the line and eliminate hidden dangers in time, which is of great significance to ensure the safe, stable and economical operation of the power system. Fault location of high-voltage transmission lines is an important part of power system rel...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a fault distance measurement method and system based on transient traveling waves in a short time window, so as to solve the problem that the existing fault distance measurement method relies on the GPS time synchronization device, and the reliability of the GPS time synchronization device is low , will affect the accuracy of time information, resulting in unreliable and inaccurate ranging results

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