电弧对GIS终端绝缘硅油介电性能及起始放电的影响  

Effects of Electrical Arc on Dielectric Properties and Initial Discharge Patterns of Silicone Oil in GIS Terminal

作　　者：张若兵[1] 郭国化[1] 邬钧 姜雨泽 邱治淳 ZHANG Ruobing1, GUO Guohua1, WU JRn1, JIANG Yuze2, QIU Zhichun1(1. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; 2. Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan 250002, Chin)

机构地区：[1]清华大学深圳研究生院,深圳518055 [2]国网山东省电力公司电力科学研究院,济南250002

出　　处：《高电压技术》2018年第3期733-739,共7页High Voltage Engineering

基　　金：国家自然科学基金(51177082)~~

摘　　要：电弧不仅损害绝缘硅油的介电性能,还会引起硅油局部温度的升高。探究电弧对硅油性能的影响具有十分重要意义,为此采用针板电极,系统研究了局部电弧对硅油介电性能和起始放电特性的影响规律。试验结果表明,油中持续的局部电弧放电,导致硅油长链分子断链重组,产生黑色油泥,硅油从无色逐渐变成棕色,直至变成黑褐色,黑色油泥随着电弧放电量的增加而增多;油泥生成后硅油的介电性能显著降低,表现为击穿电压和起始放电电压下降;电弧放电会增加硅油介质损耗角正切,体积电阻率,电弧放电量增加到1.98×10^（10） pC,介质损耗因数角tanδ从0.002%增加到1.3%,体积电阻率ρ从1.25×10^（13）？·m下降到7.8×10^（10）？·m,击穿电压从45.8 kV下降到16 kV,起始放电电压从24 kV下降到10 kV。Electrical arc can not only induce the dielectric characteristic loss of silicone oil, but also increase the local temperature of silicone oil. So it is very important to investigate effects of electrical arc on properties of silicone oil. We studied effects of electrical arc on dielectric properties and initial discharge patterns of silicone oil using a needle-plate electrode. Experimental results show that sustained electrical arc discharges break the silicone＇s long chain, and form black sludge, accompanying a gradually change of the liquid color from colorless to brown, and finally dark in the end; The amount of black sludge increases with the discharge capacity, but decreases the breakdown voltage and initial discharge voltage of oil. When the arc discharge capacity increases to 1.98×10^（10） pC, the value of dielectric loss factor（tanδ） increases from 0.002% to 1.3%, while the volume resistivity and breakdown voltage of silicone oil（ρ） decrease from 1.25×10^（13） ？·m and 45.8 kV to 7.8×10^（10） ？·m and 16 kV, respectively. In addition, the initial discharge voltage of oil declines from 24 kV to 10 kV.

关 键 词：硅油 电弧 放电量 介电性能 击穿电压 起始放电 油泥 

分 类 号：TM501.2[电气工程—电器] TM595