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特高压直流同塔混压输电线路反击耐雷性能计算方法研究

DOI: 10.16188/j.isa.1003-8337.2015.02.017, PP. 87-93

Keywords: 直流输电,反击,耐雷性能,闪络判据,伏秒特性,同塔混压

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Abstract:

绝缘子串的绝缘闪络判据是线路耐雷水平计算中的关键因素,本文基于EMTP-ATP软件,提出了模拟绝缘子闪络过程的先导发展反击闪络模型,通过算例进行了分析验证,研究了3种闪络模型对特高压直流同塔混压输电线路反击耐雷水平的影响,比较了3种方法的特点。在以相交法作为绝缘闪络判据时,选取两种典型的800kV伏秒特性曲线进行耐雷水平计算,计算结果一致。通过对线路架设参数变化进行了仿真分析,并提出了相应的防雷建议。研究结果表明:500kV线路是特高压直流同塔混压双回线路的反击薄弱所在,需进行重点防护;与相交法相比,特高压直流同塔混压线路反击耐雷水平研究推荐采用先导发展法模拟绝缘子闪络。

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