避雷线绝缘架设对杆塔雷电流分配的影响  

Influence of insulated ground wire installation on lightning current shunt by tower

作　　者：陈奎[1] 曹晓斌[1] 吴广宁[1] 易志兴 马御棠 范建斌[3] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]云南电力试验研究院(集团)有限公司电力研究院,云南昆明650051 [3]中国电力科学研究院,北京100192

出　　处：《电力自动化设备》2016年第2期136-140,147,共6页Electric Power Automation Equipment

摘　　要：建立了避雷线全线绝缘架设的输电线路雷击模型,研究了雷电流幅值、杆塔接地电阻和杆塔档距对杆塔处雷电流分配特性的影响规律。研究结果发现:雷电流较小的情况下,雷电流分配主要受避雷线绝缘间隙击穿个数的影响;如雷电流幅值为1 k A时,避雷线绝缘架设和直接接地时的分流系数最大差别为9%;雷电流幅值大于20 k A,击穿间隙个数等于或大于5个时,雷电流分配不再受避雷线绝缘架设的影响,而是主要受杆塔接地电阻的影响。因此计算线路的耐雷水平时不需要考虑避雷线绝缘架设的影响。The lightening model of power transmission line with wholly insulated installation of ground wire is established for studying the influences of lightening current amplitude,tower grounding resistance and tower span on the lightning current shunt by tower,which shows that,it is mainly influenced by the number of insulation gap breakdown when the lightning current is smaller,for example,the maximum difference of shunt coefficient between the insulated and directly-earthed installations of ground wire is 9% when the lightning current amplitude is 1 k A;it is mainly influenced by the grounding resistance of tower when the lightning current amplitude is larger than 20 k A and there are five or more insulation gap breakdowns. Therefore,it is not necessary to consider the influence of insulated installation of ground wire during the calculation of line lightening resistant level.

关 键 词：架空线路 绝缘避雷线 分流系数 雷电流 接地电阻 杆塔档距 

分 类 号：TM72[电气工程—电力系统及自动化]