振荡型操作冲击电压下SF_6气体中极不均匀电场局部放电特性  

PD Characteristics of Non-uniform Electric Field in SF_6 Gas Under Oscillating Switching Impulse Waveform

作　　者：熊俊 张亮[2] 李军浩[2] 王斯斯 陆国俊 吴国沛 

机构地区：[1]中国南方电网广州供电局有限公司,广州510000 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2017年第9期2951-2957,共7页High Voltage Engineering

基　　金：国家自然科学基金(51207124)~~

摘　　要：在对设备进行操作冲击耐压试验的同时进行局部放电测量可更加准确地进行设备绝缘状态的判断。对SF_6气体中极不均匀电场在振荡型操作冲击电压下的局部放电特性进行了研究,搭建了振荡型冲击电压发生系统,产生了符合IEC 60060-3标准的振荡型操作冲击电压。基于特高频法和脉冲电流法建立了冲击电压下局部放电测量系统,构建了尖板电极模型模拟SF_6气体中的极不均匀电场,分析了放电时延、放电幅值、放电数目和放电相位随外施电压的变化规律。结果表明:局部放电集中在外施电压各波峰附近,会在多个振荡周期发生局部放电,但第一振荡周期首次放电电压最低、激发放电的能力最强;随着外加电压的增加,局部放电相位分布宽度、放电幅值和次数均随之增加。That PD detection is carried out under the impulse voltage withstand test can more accurately judge the conditions of equipment insulation. Consequently, we studied the PD characteristics of defect with non-uniform electric field in SF_6 gas under switching impulse waveform. The oscillating impulse waveform generating system was established and the switching impulse waveform conforming to the IEC 60060-3 standard was generated. The PD detection system based on UHF and pulse current methods was established. The needle-plane model was used to simulate the non-uniform electric field in SF_6 gas. Moreover,the time delay, amplitude, number and phase of PD detection results were analyzed. The results show that PD occurs in the vicinity of peak of oscillating waveform and it will appear in multiple oscillating circles. The first oscillating circle has the stronger ability to produce PD and the first PD voltage is lower in first oscillating circle. The PD phase distribution width, PD amplitude, and number all increase with increase of the applied voltage.

关 键 词：气体组合绝缘电器 冲击耐压试验 振荡型操作冲击电压 局部放电检测 极不均匀电场 

分 类 号：TM855[电气工程—高电压与绝缘技术]