液氮温区超导复合绝缘材料沿面放电特性  

Characteristics of Surface Discharge on the Interface of Solid Insulation and Liquid Nitrogen in Superconducting Applications

作　　者：郑重[1] 于志诚 杜赫[1] 黄晓华[2] ZHENG Zhong;YU Zhicheng;DU He;HUANG Xiaohua(Beijing Key Laboratory of High Voltage & EMC, North China Electrical Power University, Beijing 102206, China;Electric Power Research Institute of China, Beijing, 100085, China)

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,北京102206 [2]中国电力科学研究院,北京100085

出　　处：《中国电力》2018年第3期69-73,共5页Electric Power

基　　金：国家重点研发计划重点专项资助项目(2016YFB0901800)~~

摘　　要：随着超导输电技术的不断发展,对各种超导设备中使用复合绝缘材料的绝缘特性提出了更高要求。复合绝缘的放电击穿往往发生在固体绝缘材料和液氮2种工作介质的交界面。而在液氮温度下,绝缘材料又有着相对独特的放电特性。针对这种情况,设计了极不均匀沿面电场,研究了3种不同的固体绝缘材料在液氮环境中沿面放电的特性,包括其放电起始电压、放电随电压发展过程、击穿电压等特性,并进一步分析3种材料差异的原因,为实际应用提供了参考。Advances in superconducting transmission technology require better insulation materials.The breakdown in composite insulation system mostly occurs on the interface between solid insulation material and liquid nitrogen.Under liquid nitrogen temperature,insulation material discharge behaviors differ a lot from those in room temperature.An electrode system is designed to generate severe non-uniform electric field on surface of solid dielectrics and liquid Nitrogen.The discharge behavior of three different solid dielectrics are tested and analyzed.The results can be used in real engineering applications.

关 键 词：超导设备 固体绝缘材料 液氮 沿面放电 放电特性 

分 类 号：TM855[电气工程—高电压与绝缘技术]