Testing method of parameters and characteristics of lightning strike of electric transmission line

Abstract

The invention relates to a testing method of parameters and characteristics of lightning strike of an electric transmission line, belonging to the technical field of electrician lightning protection. The testing method comprises the following steps: firstly, testing the lightning current on a first lightning conductor, an electric transmission tower and a three-phase lead; carrying out integration and reduction on a plurality of lightning current signals to obtain analog signals in proportion to the derivative of the tested lightning current; carrying out A / D conversion on a plurality of analog signals obtained by integration to obtain digital signals; carrying out operation processing on a plurality of digital signals output by an A / D conversion module to obtain signals of the tested lightning current; and judging whether the lightning strike is shielding failure or counterattack according to the polarity relation of the waveform of the tested lightning current. By using a multi-channel method, the invention not only can test the waveform of the lightning current of a lightning strike line but also can judge whether the lightning strike is counterattack or shielding failure easily according to the tested data, and can provide a theoretical basis for adopting pertinent lightning protection measures.

Description

technical field [0001] The invention relates to a method for testing lightning strike parameters and characteristics of transmission lines, in particular to lightning protection performance analysis of super- and extra-high voltage transmission lines and substations, and belongs to the technical field of electrical lightning protection. Background technique [0002] Lightning is an atmospheric discharge phenomenon that often occurs in nature. It has a major impact on the operation of the power system. When strong lightning strikes the transmission line, the line will generally trip and cause a power outage. With the increase of the voltage level of the power system, the height of the transmission line is getting higher and higher, so the accident of lightning strikes on the conductors of the transmission line is more likely to occur, which is called lightning strike in the power system. There are two cases of lightning strike transmission lines: counterattack and shielding...

AI Technical Summary

Problems solved by technology

[0004] The applicant once proposed a pulse current measuring device based on a flexible Rogowski coil. The patent application number is 200710121795.1. Its disadvantage is that there is only a single sensor, so it can only measure the lightning current waveform of one leakage path, and cannot obtain more information, so it is impossible to determine whether the lightning strike is a shielding attack or a counterattack

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