架空输电线路220kV复合绝缘子闪络故障分析

Flashover Fault Analysis of 220kV Composite Insulators on Overhead Transmission Line

某地区220kV架空输电线路复合绝缘子连续发生2次闪络故障,对闪络后复合绝缘子进行了干湿工频耐压、水煮及验证等试验;并用ANSYS仿真软件,分析了光纤复合架空地线(OPGW)对绝缘子电场分布情况的影响,针对加装不同曲率半径的重锤形均压环,进行了电场分布仿真分析。认为由于安装在复合绝缘子串高压端的重锤均压环曲率半径太小,其外侧上边边缘电场分布过于集中诱发了局部放电,导致复合绝缘子发生闪络故障。

Composite insulator unidentified flashover faults occurred two times in Sllceesslon on a withstand voltage carried out after wire （OPGW） to 220 kV overhead test, water boiling the flashover. The the electric field transmission line. The dry and wet power frequency and verification tests of the composite insulator were influence of optical fiber composite overhead ground distribution of insulator was analyzed by ANSYS simulation different equalizing software, the electric installation modes of ring hammer radius field distribution simulation analysis was carried out for the the pressure equalizing ring. The results showed that the installed in the composite insulator high voltage side was too small, equalizing ring partial discharge induced flashover fault. lateral edge electric field by heavy hammer type, distribution was which led to the too concentrated on composite insulator