Identification method of lightning shielding failure of electric transmission line

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 on-line lightning monitoring of power systems, and in particular to a method for identifying a lightning shielding failure of a transmission line. Background technique [0002] In recent years, the ultra-UHV power grid has developed rapidly in my country, and the lightning tripping faults of transmission lines caused by lightning strikes have also occurred frequently, seriously affecting the safe and stable operation of the power grid. With the increase in the voltage level of transmission lines, line tripping caused by lightning shielding has also become the main reason for 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 the lightning failure of the transmission line can be accurately identified, especially the shielding, it is important for the rational us...

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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