某110 kV GIS盆式绝缘子局部放电检测与解体分析

Partial Discharge Detection and Disassembly Analysis of A 110 kV GIS Basin-type Insulator

摘要:

对一起110 kV GIS盆式绝缘子局部放电的异常信号，综合利用特高频、超声波、气体成分分析以及GIS重症监护系统等多手段进行了检测和分析，并通过时差定位精确锁定了放电源位于隔离开关气室。结合特高频图谱特征以及放电源的定位位置，判断该气室盆式绝缘子附近存在绝缘类放电。经开罐检查，该气室内盆式绝缘子与隔离开关导电杆之间的胶合处存在烧蚀痕迹，胶合处的装配工艺不良使得该部位出现毛刺以及气隙，形成不均匀强电场导致局部放电。该起盆式绝缘子放电是一起较为典型的绝缘类放电案例，可以为今后类似异常情况的分析处理提供了借鉴与参考。

Abstract:

The abnormal signals of partial discharge of 110 kV GIS basin-type insulator are detected and analyzed by UHF, ultrasonic, gas composition analysis and GIS intensive care system etc, and the discharge source is accurately locked in disconnector gas chamber through time difference positioning. Combining the characteristics of UHF spectrum and the location of discharge source, it is determined that there is an insulation discharge near the basin-type insulator in the gas chamber. After the gas chamber is opened, there are traces of ablation at the bonding between the basin-type insulator and the conductive rod of disconnector in the gas chamber. The poor assembly process of bonding causes burrs and air gaps in this part so as to form an uneven strong electric field and cause partial discharge. The discharge of basin-type insulator is a typical case of insulation discharge, which can provide a reference for the analysis and treatment of similar abnormal situations in the future.