特高压变电站1000kV GIS局部放电问题分析

Analysis of Partial Discharge in 1000kV GIS of UHV Substation

随着特高压变电站的持续投运,检测发现多起局部放电问题,在信号传播特性方面存在一定特殊性。为进一步研究特高压GIS局部放电问题,总结特高压GIS局部放电特性,指导类似局部放电问题处理和现场带电检测工作,介绍一起特高压GIS局部放电问题处理过程,涵盖局放检测和判断、解体检查、试验验证、原因分析全部环节,确认局放原因为安装过程中合闸电阻的均压环与绝缘支撑杆存在摩擦或磕碰,导致均压环表面金属物质残留到绝缘支撑杆表面,绝缘支撑杆表面金属残留物与均压环间发生局部放电。该原因导致特高压GIS发生局部放电为首次确认和处理,扩展了特高压GIS局放检测指导经验,为后续处理类似问题和优化特高压GIS设计提供参照,对提升特高压GIS运行稳定性具有推动作用。

With the continuous operation of UHV substation,many partial discharge problems are found,which has some particularity in signal propagation characteristics.In order to further study the partial discharge problem of UHV GIS,summarize the partial discharge characteristics of UHV GIS,and guide the treatment of similar partial discharge problems and on⁃site live detection,the treatment process of a partial discharge problem of UHV GIS was introduced,which covered all links of partial discharge detection and judgment,disassembly inspection,test verification and cause analysis.The partial discharge was caused by friction or collision between the equalizing ring of the closing resistance and the insulating support rod during installation,resulting in the residual metal on the surface of the equalizing ring to the surface of the insulating support rod,and the partial discharge between the metal residue on the surface of the insulating support rod and the equalizing ring.This is the first time to confirm and deal with the partial discharge of UHV GIS caused by the above reasons,which expands the guiding experience of partial discharge detection of UHV GIS,provides guidance for subsequent treatment of similar problems and optimization of UHV GIS design,and promotes the operation stability of UHV GIS.