基于有限元法的避雷器阻性电流检测的相间干扰计算分析  

Calculation and Analysis of Interphase Interference for Monitoring Resistive Current of Arresters Based on the Finite Element Method

作　　者：李金亮[1,2] 杜志叶[1] 阮江军[1] 李凌燕[1] Li Jinliang;Du Zhiye;Ruan Jiangjun;Li Lingyan(School of Electrical Engineering Wuhan University Wuhan 430072 China;Live Working Center of State Grid Corporation of Hunan Changsha 410010 China)

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国网湖南省电力公司带电作业中心,长沙410010

出　　处：《电工技术学报》2016年第18期184-190,198,共8页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB209404)

摘　　要：在线监测氧化锌避雷器阀片电阻可有效反映避雷器运行状态。避雷器实际运行时多呈一字排列且三相距离近,相间干扰对泄漏电流的影响很大。为此,提出了一种新的高压氧化锌避雷器在线监测方法,该方法基于阻容网络模型,通过对避雷器泄漏电流进行测量,采用有限元法计算避雷器部分电容,最后利用迭代算法求解避雷器阀片电阻,可有效消除相间干扰对在线监测的影响。以变电站500k V和220k V避雷器为例,计算出各相避雷器每节的阀片电阻,并与实际测量值进行对比,计算结果和测量结果吻合,验证了该方法的有效性。On-line monitoring the varistor column could reflect the real performance of arrestersin service. The interphase interference affects the leakage current much due to the short distance amongthree phase arresters. Therefore, a new method based on resistance-capacitance network model foron-line monitoring of high voltage ZnO arresters is put forward. Herein, iterative algorithm is adopted.Thus, the interphase interference of monitoring arresters can be eliminated effectively. Firstly, theleakage currents and phase angle differences are acquired by measuring the 500kV arresters and 220 kVarresters in a substation. Then, the partial capacitances through finite element method are obtained.Finally, the varistor column resistance of each section per phase is calculated. The calculated resultsagree well with the measured results, which demonstrates the effectiveness and correctness of theproposed method.

关 键 词：高压避雷器 阻容网络 相间干扰 阀片电阻 阻性电流 有限元法 

分 类 号：TM835[电气工程—高电压与绝缘技术]