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特高压直流同塔混压输电线路耐雷性能研究

DOI: 10.16188/j.isa.1003-8337.2015.01.013, PP. 54-60

Keywords: 直流输电,反击,绕击,耐雷性能,相交法,同塔混压

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Abstract:

特高压直流同塔混压输电线路可有效解决日益增长的电力需求和输电走廊资源紧缺的矛盾,研究其耐雷性能具有重要意义。基于电磁暂态程序EMTP-ATP,提出了模拟绝缘子闪络过程的相交法绝缘闪络判据,并通过算例进行了分析验证,研究了两种不同塔型的反击耐雷性能及其影响因素。利用改进电气几何模型对不同塔型和不同线路的绕击耐雷性能进行了研究。与±800kV直流单回线路和±500kV直流双回线路进行对比,得出了特高压直流同塔混压输电线路反击和绕击耐雷性能的特点。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;而500kV线路的绕击耐雷性能则优于800kV线路;与导线一字型布置的杆塔相比,特高压直流同塔混压输电线路推荐采用导线干字型布置的杆塔。

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