冲击电压下SF_6气体绝缘典型缺陷局部放电特性研究  

Partial Discharge Characteristics of Typical Defect of SF_6 Gas Insulation Under Impulse Voltage

作　　者：刘蓉[1] 李继胜[2] 赵学风 田维坚[1] 樊养余[1] 

机构地区：[1]西北工业大学电子信息学院,西安710072 [2]陕西师范大学物理学与信息技术学院,西安710062 [3]国网陕西省电力公司电力科学研究院,西安710054

出　　处：《高压电器》2015年第11期122-127,共6页High Voltage Apparatus

基　　金：陕西省自然科学基金项目(2013JM1010;2015GY130);中央高校基本科研业务费专项资金项目(GK201402013)~~

摘　　要：随着电网电压等级的不断提高,对于高电压等级设备现场只做工频耐压试验已不能满足电网安全需要,针对此情况,IEC推荐采用振荡型雷电波和振荡型操作波作为现场冲击耐压试验用波形,此外,为了对设备的整体绝缘强度进行合理判断,该标准还建议现场做冲击耐压试验的基础上同时进行局部放电检测。为了对比研究振荡型冲击与双指数冲击对绝缘作用的差异,文中首先建立了产生波形符合IEC 60060-3—2006标准要求的振荡冲击发生器及相应的局部放电检测系统,在此基础上,对比研究了GIS中典型缺陷在双指数冲击电压和振荡冲击电压下的放电特性。结果表明,振荡冲击能多次激发缺陷发生放电,更容易暴露出金属突起物缺陷。研究结果为现场实现冲击下局部放电检测奠定了试验基础。It is well known that the power frequency withstand voltage test and its corresponding partial discharge（PD）measurement are inadequate for the detection of all the hidden flaws in GIS with the continuous improvementof the voltage level of the power grid. Such inadequacy can be compensated by the oscillating impulse withstandvoltage（OIV） test and its PD detection measurement which are recommended by IEC. In order to study thedifference of impact on insulation between the OIV and the double exponential impulse voltage, an OIV generatoris designed and built to produce the voltage waveforms in accordance with the IEC 60060-3--2006 standard, andthe partial discharge （PD）measurement system is also developed. Then PD characteristics of typical defect in GISunder double exponential impulse voltage and OIV are studied and compared. The results show that the number ofpartial discharge pulses under OIV more than that under double exponential impulse voltage, and so that it isbetter to detect metal protrusion defect in GIS. This study may provide a basis for PD detection under OIV test.

关 键 词：冲击电压 典型缺陷 SF6气体 局部放电 测量系统 

分 类 号：TM855[电气工程—高电压与绝缘技术]