超高压线路不同电解质材料绝缘子串组合技术的研究与应用

Research and Application on Combination Technology of Different Electrolyte Materials Insulator String in EHV Transmission Line

通过仿真理论计算、实验室真型电气试验研究和运行线路上实测各类不同型式的玻璃、复合绝缘子组合串的电位分布值,优化比较后推荐出500kV线路悬垂串采用横担端1片、导线端6片盘径Φ360mm、结构高度170mm、爬电距离550mm的大盘径标准型或550mm爬距的钟罩防污型玻璃绝缘子,中间配相应长度的复合绝缘子和上扛式悬垂线夹的组合方式,计算和试验表明,该组合方式的复合绝缘子导线端电位分布由原纯复合绝缘子时的41%降至11%,同时可取消下挂式线夹时的均压装置,运行线路上实测优化组合时的复合绝缘子导线端分布电压值在22kV以下。

Through simulation theoretical calculation,laboratory real-type electrical test and potential distribution value of different types of glass,composite insulator string was actual measured on service transmission lines,after optimization comparison,it was recommended that 500 kV line hanging string with cross arm end one piece,condutor end 6 pieces of disc diameter standard type or bell type anti-pollution glass insulator of disc diameter Φ 360 mm,structural height 170 mm,550 mm creepage distance,with combination method of the composite insulator in appropriate length and carried-up type suspension clamps in the middle,the caulculation and test showed that electric potential distribution at composite insulator conductor end of this combination method was reduced from the 41% of the original simple composite insulator to 11%,at the same time cancel grading devices of hanging clamps,when the optimization combination was actual measured on the service line,composite insulator conductor distribution voltage should be below 22 kV.