10kV电缆终端绝缘气隙缺陷的局部放电及缺陷表面烧蚀特征  

Partial Discharge and Surface Ablation Characteristics of Air Gap Defects in 10 kV Cable Termination

作　　者：吴科[1] 马春亮[2] 周凯[1] 万利[1] 

机构地区：[1]四川大学电气信息学院,成都610065 [2]中国南方电网超高压输电公司梧州局,广西梧州543002

出　　处：《绝缘材料》2015年第7期38-43,共6页Insulating Materials

基　　金：国家自然科学基金资助项目(51477106)

摘　　要：为研究电缆终端主绝缘含气隙缺陷下的局部放电(PD)及缺陷表面的形貌特征,通过在10 k V电缆终端上制作典型的气隙缺陷,利用电缆附件电热老化平台模拟终端的实际运行工况并加速老化,利用罗戈夫基线圈传感器提取终端在不同老化时刻下的PD数据,并用扫描电镜(SEM)对气隙缺陷的表面形貌特征进行观察。结合气隙缺陷内部的电场分布进一步分析终端PD的发展规律。结果表明:电缆终端的PD及气隙缺陷表面的形貌特征在不同老化时刻下呈现明显差异,缺陷表面XLPE的碳化过程提高了气隙缺陷的表面电导率,加快了缺陷表面电荷的耗散速度。In order to investigate the partial discharge（PD） of the cable termination main insulation with air gap defects and the morphology characteristics of defects surface, we designed typical air gap defects in 10 k V cable termination, and used the cable accessories electrical and thermal ageing platform to simulate the real condition of termination and to accelerate ageing. The PD data under different ageing time was extracted by Rogowski sensor, and the surface morphology of air gap defects was observed by SEM. The development rule of PD was analyzed combining the electric field distribution of air gap defects. The results show that the PD characteristics of cable termination and the surface morphology of air gap defects are significant difference under different ageing time. Because of the carbonization process of XLPE on defects surface, the surface conductivity of defects increases, and the dissipation rate of surface charge is accelerated.

关 键 词：电缆终端 气隙缺陷 局部放电 电场分布 表面电导率 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM247[一般工业技术—材料科学与工程]