Method for accurately positioning lightning conductor, struck by lightning, of power transmission line

Abstract

The invention provides a method for accurately positioning a lightning conductor, which is struck by lightning, of a power transmission line, belongs to the field of electricity technology, and mainly aims at solving the problems that wide area measurement of a present lightning positioning system is low in precision, and an accurate positioning method based on parameters and characteristics of the power transmission line is low in economy. The method of the invention is characterized in that oscillating current travel waves of the lightning conductor struck by lightning are collected via monitoring terminals, wavelet transformation is carried out on the waveform, effective GPS travelling wave current time of the oscillating current of the lightning conductor struck by lightning is extracted, and the position of the lightning conductor struck by lightning is accurately positioned based on analysis on high-frequency current travelling wave refraction and reflection. According to the method, a line corridor which is monitored in the wide area of lightning can be reduced to the lightning conductor of the power transmission line body, thereby improving the positioning precision; and in addition, the monitoring terminals are mounted at the interval of 15 to 20 km, so that the cost is greatly reduced compared with a method in which each tower is provided with a monitoring device.

Description

technical field [0001] The invention relates to the field of intelligent fault diagnosis of power system transmission lines, in particular to the field of lightning strike fault location. Background technique [0002] According to the classification and statistics of power grid faults, 40%-70% of transmission line tripping faults are caused by lightning strikes, which is the first cause of tripping of power grid company's transmission lines and the third reason for unplanned outage of lines. Lightning strike faults on transmission lines are difficult to accurately locate fault points and identify the nature of fault lightning strikes. Inaccurate location of lightning strike faults will prolong the time for finding and repairing faults, thereby affecting the rapid restoration of power supply, and inaccurate judgment of the nature of lightning strikes will reduce the pertinence of protective measures taken, making it difficult to obtain a significant lightning strike fault tri...

AI Technical Summary

Problems solved by technology

[0007] The purpose of this patent is to propose a method based on the refraction time of the traveling wave current of the monitoring waveform of the transmission line to realize the precise positioning method of the position of the lightning strike transmission line, so as to solve the inaccurate positioning and large measurement error of the traditional lightning positioning system. However, the problem of poor economy in accurate lightning strike transmission line positioning

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