并联均压电容配置对特高压无间隙金属氧化物避雷器电位分布影响的研究  

Study on The Influence of The Grading Shunt Capacitors Configuration on Potential Distribution in UHV MOA Without Gap

作　　者：朱跃 张金凤[2] 郭洁[2] 李可伦[2] 徐建铁 周越[2] 

机构地区：[1]陕西省电力公司,西安7110048 [2]西安交通大学电气工程学院,西安710049

出　　处：《电瓷避雷器》2016年第2期140-144,共5页Insulators and Surge Arresters

摘　　要：特高压无间隙金属氧化物避雷器挂网运行时,杂散电容的存在使得避雷器沿电阻片轴向的电位分布极不均匀,从而部分电阻片荷电率很高,会引起电阻片加速老化和热崩溃,导致避雷器损坏。改善避雷器电位分布,降低荷电率可以有效提高其运行可靠性,常采用在避雷器高压端加均压环、避雷器元件并联均压电容的方式均压。笔者采用有限元法对特高压无间隙金属氧化物避雷器挂网运行时的电位分布进行了仿真计算研究,在给定的均压环配置下,研究了均压电容的配置对避雷器电位分布的影响,得出较为有效的降低电阻片荷电率的方案,为特高压无间隙金属氧化物避雷器均压方式的优化提供了参考依据。When the UHV MOA without gap in service, it shows non-uniform potential distribution of varistors in the axial direction of arresters because of stray capacitance, so that electric load rate of part of the varistors is even high, which will lead to the aging acceleration and thermal runaway, which lead to the damage of arresters ultimately. To improve M0A potential distribution and reduce Electric load rate usually requires a comprehensive measure that the grading rings are taken in the high-voltage side, while grading capacitors are enforced on the arrester elements, which can effectively improve the operational reliability. Based on the given grading rings configuration, the influence of different structure parameters of grading capacitors on potential distribution of the arrester is studied by means of the finite element analysis method, which draws an effectively method to reduce the electric load rate of the arrester resistors and provides reference for the design of grading capacitors of arresters.

关 键 词：电阻片 均压电容 电位分布 荷电率 

分 类 号：TM862[电气工程—高电压与绝缘技术]