电网技术2026，Vol.50Issue(3)：中插116,1320-1329,11.DOI:10.13335/j.1000-3673.pst.2024.2063
交直流交替作用下超特高压交流GIS/GIL绝缘沿面闪络研究
Research on the Insulation Surface Flashover in EHV/UHV AC GIS/GIL Under Alternating AC and DC Voltage
摘要
Abstract
Gas insulated switchgear(GIS)and gas insulated transmission lines(GIL)are key equipment in the power system,and their reliability directly affects the safety and stability of the power grid.In recent years,multiple insulator flashovers have occurred during commissioning and operation,in which the GIS/GIL have passed the on-site handover withstand voltage test,greatly affecting the reliability of power supply.In this paper,common fault characteristics are obtained through comparative analysis of multiple similar faults,and typical fault conditions and causes are grasped.Then,the experiment is conducted for fault replication in the factory.The results indicate that insulator without defects do not discharge under alternating current(AC)and direct current(DC)voltage.Insulators with defects can withstand AC withstand voltage but discharge under DC voltage(＜400kV).The experiment phenomenon is consistent with the on-site fault,verifying that the on-site fault is caused by small defects under the alternating AC and DC voltage.Based on this,prevention and suppression suggestions for this type of fault are further proposed.This study can help to gain a deeper understanding of the cause of on-site faults,improve the intrinsic safety of equipment,and ensure the safe operation and long-term stability of GIS/GIL.关键词
气体绝缘开关设备/气体绝缘输电线路/绝缘子闪络/交直流交替/直流残压Key words
gas-insulated switchgear(GIS)/gas-insulated transmission line(GIL)/insulator flashover/alternating AC and DC voltage/residual voltage分类
信息技术与安全科学引用本文复制引用
李星,丁登伟,许渊,张榆,毕建刚,刘卫东..交直流交替作用下超特高压交流GIS/GIL绝缘沿面闪络研究[J].电网技术,2026,50(3):中插116,1320-1329,11.基金项目
四川省自然科学基金项目(2023NSFSC0816,2024NSFSC0117).Project Supported by Sichuan Natural Science Foundation(2023NSFSC0816,2024NSFSC0117). （2023NSFSC0816,2024NSFSC0117）
