GIS绝缘子表面金属异物附着缺陷局部放电UHF信号间歇性与有效检出率分析  

Analysis on UHF signal intermittency and effective detection rate of partial discharge of metal particles on GIS insulator surface

作　　者：李伟 张连根[2] 李乐颖 孔举 胡德鹏 齐波[2] 姚维为 唐志国[2] LI Wei;ZHANG Liangen;LI Leying;KONG Ju;HU Depeng;QI Bo;YAO Weiwei;TANG Zhiguo(China Three Gorges Corporation,Wuhan 430010,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]中国长江三峡集团有限公司,湖北武汉430010 [2]华北电力大学,新能源电力系统全国重点实验室,北京102206

出　　处：《绝缘材料》2024年第8期122-129,共8页Insulating Materials

基　　金：中国长江三峡集团有限公司企业科技项目(202103368)。

摘　　要：局部放电特高频(UHF)方法检测局部放电(PD)是当前评估气体绝缘开关设备(GIS)状态和绝缘性能的重要手段之一。本文为解决局部放电UHF检测出现大量漏报和误报的问题,通过开展GIS绝缘子表面金属异物附着缺陷长期恒压实验,结合现有UHF检测策略对放电信号的成功捕捉概率进行分析,从检测时长和检出阈值两方面对现有UHF信号的检测策略提出了优化方案。结果表明:绝缘子表面金属异物附着缺陷局部放电具有间歇性特点,现有UHF带电检测及在线监测策略对放电的检出概率均不高。针对带电检测策略进行优化,延长检测时长至2247s,有效放电的捕捉概率可达85%;针对在线监测策略进行优化,延长形成一个局部放电事件(PDEvent)的测量时间和降低其检出阈值皆可增大PDEvent的检出概率,工程应用中可选择合适的测量时间和检出阈值相组合的方式来进行间歇性放电的检测。The ultra-high frequency(UHF)method for detecting partial discharge(PD)is currently one of the important means to evaluate the state and insulation performance of gas insulated switchgear(GIS).In this paper,in order to solve the problem of a large number of missing and false alarms in UHF detection of GIS partial discharge,GIS insulator with metal foreign object attached on the surface was conducted long-term constant voltage experiments.The successful capture probability of discharge signal was analyzed by combining with the existing UHF detection strategies,and optimization schemes of the existing UHF signal detection strategies were proposed from detection time and detection threshold.The results show that the partial discharge of metal foreign object defect attached on the insulator surface has intermittent characteristics,and the existing UHF live detection and online monitoring strategies have low detection probability of discharge.The capture probability of effective discharge can reach 85% by extengding the detection time to 2247 seconds in optimization of live detection strategy.The detection probability of PD Event can increase by extengding the measurement time of forming a partial discharge event(PD Event)and reducing detection threshold in optimization of online monitoring strategy.In engineering application,the combination of appropriate measurement time and detection threshold can be selected to detect the intermittent discharge.

关 键 词：特高频检测 气体绝缘开关设备 间歇性局部放电 状态检测 

分 类 号：TM215[一般工业技术—材料科学与工程]