摘要
为改善复合绝缘子电场和电位分布,基于有限元法,以复合绝缘子和玻璃绝缘子串联组合使用为例,建立了输电线路复合绝缘子三维电场计算模型,提出了一种改善复合绝缘子电场分布的新方法,研究了在不同电压等级的复合绝缘子导线侧串联玻璃绝缘子后复合绝缘子表面电位和电场分布的改善情况。计算结果表明:复合绝缘子导线侧串联玻璃绝缘子后,降低了复合绝缘子导线端承受的电压,消除了畸变电场,改善了复合绝缘子端部的电场分布,并推荐了不同电压等级的复合绝缘子导线侧需串联的玻璃绝缘子片数。110kV电压等级复合绝缘子串联玻璃绝缘子的人工污秽试验表明:串联玻璃绝缘子后,绝缘子串的闪络电压明显提高,而闪络梯度变化不大,这是由于玻璃绝缘子的均压作用使得高压端电位均匀,对绝缘子的闪络起弧起了一定的抑制作用。220kV和500kV电压等级的复合绝缘子可以此作为参考。
In order to improve the electric field and potential distribution,taking the combined use of composite insulators and glass insulators as an example,we put forward a new method to improve the electric field distribution of composite insulators,established a three-dimensional electric field calculation model of composite insulators in the transmission line,and studied the improved situation of surface potential and electric field distribution of composite insulators with glass insulators installed in the high voltage side of composite insulators at different levels of voltage. The results show that by this means,the voltage that the conducting wire side of composite insulators can withstand is lowered; distorted electric field is eliminated; the electric field distribution in the ends of composite insulators is improved. Finally,we recommend the number of glass insulators which should be installed in the high voltage side of composite insulators at different levels. According to the test results of 110 kV composite insulator carried in the artificial fog chamber,the result shows that the flashover voltage is obviously improved and the voltage gradient is slightly changed after series connection glass insulator,because the pressure effect of glass insulator and the flashover arcing are inhibited certainly.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第7期1630-1637,共8页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724503)~~
关键词
复合绝缘子
玻璃绝缘子
有限元
电场强度
电位分布
污闪
composite insulator
glass insulator
finite element
electric field
potential distribution
pollution flashover
