雷电侵入波波形对避雷器放电电流的影响

Influence of Lightning Intrusion Waveform on Arrester Discharge Current

无间隙金属氧化物避雷器的雷电残压特性、雷电动作负载特性是避雷器雷电保护特性的核心特征,这些特性和作用的雷电波有很大关系。利用电磁暂态分析程序EMTP—ATP建立了典型750 k V变电站雷电计算模型,依据国内外捕获的雷电波特征参数统计结果,雷电流的波头约为1μs^5μs,波长约为20μs^100μs,选取了有代表性的5种雷电侵入波波形,即1/20μs、1/100μs、2.6/50μs、5/20μs、5/100μs。研究了不同雷电侵入波对避雷器放电电流的影响。

The lightning residual voltage characteristic and the lightning action load characteristic of the MOA without gaps are the core characteristics of the lightning protection characteristic of the lightning arrester; these characteristics have a great relationship with the lightning wave. In this paper, a typical 750 kV substation lightning model is established by EMTP-ATP. Based on the statistical results of the lightning wave captured at home and abroad, the wave head of the lightning current is about 1 μs -5 μs and the wave tail of the lightning current is varied in the range of 20 μs -100 μs, the representative five lightning intrusion waveforms are 1/20μs, 1/100 μs, 2.6/50 μs, 5/20 μs and 5/100 μs. The discharge current flowing through the lightning arrester under the different waveforms of lightning intrusion is studied.