基于熵权法的华中500 kV高压输电线路雷击跳闸情况分析

鉴于近年来极端天气不断出现,以往的雷电统计规律和趋势与当前的实际情况之间有较大的差异,对线路防雷评估带来较大的误差.通过对华中区域数十条500 kV线路走廊10 km范围内近年的落雷数据进行分析,从含后续回击的主放电、不含后续回击的主放电以及后续回击3种类型分析该区域雷电放电的相关规律,发现含后续回击的主放电次数最少....

Entropy Weight Method Based Analysis on Lightning Trip in Central China 500 kV Transmission Lines

Due to constantly appearing of extreme weather in recent years, it leads to a big difference between the previous statistical law and trend of lightning and the current actual situation, and it brings obvious error in to the lightning protection evaluation of transmission lines. By means of analyzing the ground lightning data within the scope of 10 km width of dozens of 500 kV transmission line corridors in Central China, the relevant law of thunder discharges in these regions, which were divided into three types, i.e., the main discharge containing subsequent return stroke, the main discharge not containing subsequent return stroke and subsequent return stroke, was analyzed, and it was discovered that the times of the main discharge containing subsequent return stroke was the least. It was discovered also by analyzing the ground lightning with different polarities that the proportion of negative polarity discharge obviously varied with statistical patterns of discharge types, and in the total amount of the positive polarity discharge the proportion of the main discharge not containing subsequent return stroke was 79.33%. On the basis of above-mentioned analysis, the entropy weight method, by which the influences of the parameters of both main discharge and the subsequent return stroke on transmission line trip could be considered, was proposed. The weighted calculation results of practical transmission line show that the lightning trip of practical transmission lines is mainly caused by main discharge containing subsequent return stroke as well as the subsequent return stroke, thus, the proposed entropy weight method turns out to be true.