An identification method for lightning shielding faults on transmission lines

Abstract

The invention provides an identification method of a lighting shielding failure of an electric transmission line. The identification method is based on waveform characteristics of traveling wave current in on-line monitoring electric transmission line phase conductors and mainly includes performing on-line monitoring to the traveling wave current, extracting data of lightning stroke failure traveling wave current on a guide line, analyzing the waveform characteristics of the lightning stroke failure traveling wave current and determining that the electric transmission line has a lightning shielding failure if a section prior the maximum traveling wave current amplitude value responds to a like polarity small pulse which is directly connected with a main discharging pulse and the pulse response duration and the current amplitude value are within certain ranges. Compared with identification methods in prior art, the identification method is explicit in judgment thoughts and tested and verified by field data, so that the identification method is capable of accurately and effectively identifying whether a waveform current signal is a signal of the lighting shielding failure electric transmission line, effectively helping electric transmission line operating maintenance departments to judge lighting stroke failure properties of the line and know lightning stroke failure reasons, and scientifically guiding line lightning protection reconstruction.

Description

technical field [0001] The invention relates to the technical field of online lightning monitoring of electric power systems, in particular to an identification method for lightning shielding faults of transmission lines. Background technique [0002] In recent years, with the rapid development of ultra-high voltage power grids in my country, lightning tripping faults of transmission lines caused by lightning strikes also occur frequently, seriously affecting the safe and stable operation of power grids. With the increase of the voltage level of transmission lines, line tripping caused by lightning shielding has become the main cause of line lightning tripping, which has been highly valued by the production and operation management department. In the lightning protection operation and maintenance of transmission lines, if the nature of lightning strike faults on transmission lines, especially shielding strikes, can be accurately identified, it will be of great importance for...

AI Technical Summary

Problems solved by technology

Both of these two methods install the sensor on a single-base tower, and cannot obtain the lightning strike data of the entire line, and whether the data can be obtained depends largely on the probability of lightning hitting the tower, and the dispersion is very large. With a large number of installations, it is difficult to obtain effective and usable data

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