架空输电线路雷电绕击与反击的识别

发布时间：2018-05-11 07:12

本文选题：反击 + 绕击　；参考：《高电压技术》2014年09期

【摘要】：为准确辨识输电线路雷击故障,分析了雷电绕击和反击的发生机理,并基于ATP-EMTP建立了110 kV输电线路杆塔多波阻抗模型及雷击仿真模型进行仿真。结果表明:雷击杆塔塔顶或绕击导线时,绝缘子串两端电位差方向不同;雷击闪络时,被击杆塔闪络相绝缘子串电位差降为0,雷击暂态过程结束后,邻近杆塔对应相绝缘子串电位差近似为0;反击闪络时,邻近杆塔绝缘子串两端电位差方向发生改变;杆塔入地电流方向可表征雷电流极性。基于上述特征,提出通过输电线路绝缘子串电位差和杆塔入地电流构建特征量,以2者的方向及其有效值作为识别判据,对雷击故障及未故障条件下的雷击类型进行辨识。
[Abstract]:In order to accurately identify the lightning strike fault of transmission line, the mechanism of lightning winding and counterattack is analyzed, and the multi-wave impedance model and lightning stroke simulation model of 110kV transmission line tower are established based on ATP-EMTP. The results show that the potential difference between the two ends of the insulator string is different when lightning strikes the tower top or around the conductor, and when lightning strikes flashover, the potential difference of the flashover insulator string decreases to 0, and the transient process of lightning stroke is over. The potential difference of the insulator string corresponding to the adjacent tower is approximately 0; the direction of the potential difference between the two ends of the adjacent tower insulator string changes when it strikes back the flashover; the direction of the grounding current of the tower can indicate the polarity of the lightning current. Based on the above characteristics, it is put forward that the characteristic quantity is constructed by the potential difference of insulator string of transmission line and the grounding current of tower, and the lightning strike type under the condition of lightning strike and non-fault is identified by using the direction of two and its effective value as the identification criterion.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;国网四川省电力公司电力科学研究院;
【基金】：国家创新研究群体基金(51021005) 输配电装备及系统安全与新技术国家重点实验室自主研究项(2007DA10512708302)~~
【分类号】：TM863

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