电工技术学报  2020, Vol. 35 Issue (2): 435-443    DOI: 10.19595/j.cnki.1000-6753.tces.181738
高电压与绝缘 |
高空核爆电磁脉冲激励下架空输配电线路绝缘子闪络情况分析
张汉花1, 邹军2, 田蓓1, 吴玫蓉1
1. 宁夏电力能源安全重点实验室 国网宁夏电力有限公司电力科学研究院 宁夏 750002;
2. 清华大学电机工程与应用电子技术系 北京 100084
Flashover Possibility Analysis of Overhead Power Transmission and Distribution Line Insulators with the Excitation of High Altitude Electromagnetic Pulse
Zhang Hanhua1, Zou Jun2, Tian Bei1, Wu Meirong1
1. Ningxia Key Laboratory of Electrical Energy Security Ningxia Electric Power Research Institute Ningxia 750002 China;
2. The Department of Electrical Engineering Tsinghua University Beijing 100084 China
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摘要 高空核爆电磁脉冲(HEMP)是核爆炸除核辐射、热辐射、冲击波外的第四种效应,HEMP会在输配电线路上耦合产生过电压,引起线路绝缘子串闪络,直接威胁到电网的安全稳定。该文提出采用电路方法来求解HEMP激励下,多导体传输线网络的暂态感应电压。首先通过求解多导体传输线方程,推导出多导体传输线等效的PI型电路模型及电路参数。其次利用节点电压法及IFFT求解多导体传输线网络节点的暂态感应电压。该方法避免了直接对相互耦合的大规模传输线方程组的求解,从而极大地简化了计算。通过与文献计算结果对比,验证了方法的正确性。最后应用传输线有效耦合长度概念,建立考虑地线影响的输配电线路简化模型,并分析了国内四种电压等级的输配电线路在400km高空核爆炸下,绝缘子闪络的可能性。仿真结果表明,低压配电网易在高空核爆电磁脉冲激励下发生绝缘子串闪络。
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关键词 高空核爆电磁脉冲多导体传输线方程PI型等效电路绝缘子闪络    
Abstract:High-altitude electromagnetic pulse (HEMP) is the fourth effect of nuclear explosion in addition to nuclear radiation, thermal radiation and blast wave. HEMP can induce large overvoltage on power lines and cause the flashover of insulator, which will threaten the security and stability of power grid. In this paper, a circuit method is proposed to analyze the induced voltage on multi- conductor transmission line network. The basic idea is to take the place of transmission line excited by HEMP with its PI-type equivalent circuit obtained by exact solution of transmission line equations, firstly. Secondly, the nodal approach and IFFT are applied on the equivalent circuit to calculate the transient induced voltage. The proposed method avoids the direct solution of the large-scale coupled transmission line equations, which simplifies the calculation. By comparing with the literature results, the circuit method is verified. Finally, the proposed method is applied to analyze the induced voltage on overhead power lines, in which the efficient coupling length (ECL) is used to simplify the overhead power line model and the influence of ground lines is also taken into account. Thereafter, the flashover possibility of four kinds of overhead power line insulators, which is excited by 400km nuclear explosion, is analyzed. The results show that flashover easily occurs on the distribution line insulator.
Key wordsHigh-altitude electromagnetic pulse    multi-conductor transmission line equations    PI-type equivalent circuit    flashover of insulator   
收稿日期: 2018-11-06      出版日期: 2020-01-17
PACS: TM12  
基金资助:国家自然科学基金资助项目(51577103)
通讯作者: 邹 军 男,1971年生,教授,博士生导师,研究方向为电磁场工程数值计算与软件技术。E-mail: zoujun@tsinghua.edu.cn   
作者简介: 张汉花 女,1992年生,硕士研究生,研究方向为电磁场数值计算及电力系统分析。E-mail: zhanghh2014@qq.com
引用本文:   
张汉花, 邹军, 田蓓, 吴玫蓉. 高空核爆电磁脉冲激励下架空输配电线路绝缘子闪络情况分析[J]. 电工技术学报, 2020, 35(2): 435-443. Zhang Hanhua, Zou Jun, Tian Bei, Wu Meirong. Flashover Possibility Analysis of Overhead Power Transmission and Distribution Line Insulators with the Excitation of High Altitude Electromagnetic Pulse. Transactions of China Electrotechnical Society, 2020, 35(2): 435-443.
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