摘要
GIS绝缘子表面的金属颗粒是一种常见的缺陷类型,且被认为是引起现场GIS绝缘子沿面闪络的重要原因。因此,对绝缘表面金属颗粒引起的局部放电情况进行监控,就可以有效地预测绝缘子的闪络几率,从而减少绝缘故障的发生。以220 kV GIS支柱绝缘子上的固定金属丝为例,研究了绝缘闪络前表面金属丝造成的局部放电的各项特性,包括视在放电量、脉冲重复率、相位分布情况等随时间的变化规律。研究成果给变电站现场的局部放电检测和闪络故障预测提供了可靠的实验数据,对于提升预测的准确性和GIS设备运行的安全可靠性具有重要的意义。
The metal particles on the surface of the insulator are common to see in GIS,which are regarded as a critical reason to cause the surface flashover on GIS insulators in substations.Hence,the probability of occurrence of the surface flashover can be effectively predicted by monitoring the partial discharge(PD)induced by the metal particles on the surface of the insulator,and the failure rate of the GIS can be reduced.In this paper,a 220 kV GIS post insulator with fixed metal wire is introduced to investigate on the variation of the PD characteristics,including the apparent PD magnitude,the distribution of the PD pulses on power cycles,and the repeat rate of the PD,to the duration of the PD experiment.The research results of this paper will provide reliable data to the PD detection and flashover prediction on site,and will make significant sense to the improvement of the accuracy of prediction and the operating stability of the GIS in substations.
作者
徐洋
杨宁
刘卫东
高文胜
XU Yang;YANG Ning;LIU Weidong;GAO Wensheng(State Grid Suzhou Power Supply Company,Suzhou 215004,China;China Electric Power Research Institute,Beijing 100192,China;State Key Lab.of Power System,Dept,of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《电瓷避雷器》
CAS
北大核心
2020年第4期202-206,214,共6页
Insulators and Surge Arresters
基金
国家电网公司科技项目“基于多源大数据融合分析的GIS设备状态检测与异常诊断技术研究”(编号:GYB17201800224)。
关键词
GIS
绝缘子
金属丝
局部放电
沿面闪络
GIS
insulator
metal wire
partial discharge
surface flashover
作者简介
徐洋(1990-),男,工学博士,主要从事电气试验技术方面工作。
