尼龙在液氮中的冲击沿面闪络特性  

Impulse surface flashover characteristics of Nylon in liquid nitrogen

作　　者：徐刚[1] 曾玲丽[2] 梁振 汤昕[3] 王旭 杨鑫[2] XU Gang;ZENG Ling-li;LIANG Zheng;TANG Xin;WANG Xu;YANG Xin(Guangdong Foshan Nanhai Power Supply Company, Foshan, 528226, China;School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, 410114, China;Changsha Electric Power Technical College, Changsha, 410131, China;Henan Kaifeng Power Supply Company, Kaifeng, 475000, China)

机构地区：[1]广东电网公司佛山南海供电局,广东佛山528226 [2]长沙理工大学电气与信息工程学院,湖南长沙410114 [3]长沙电力职业技术学院,湖南长沙410131 [4]国网河南省电力公司开封供电公司,河南开封475000

出　　处：《电力科学与技术学报》2019年第2期141-145,共5页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金青年基金(51407013)

摘　　要：从超导装置绝缘的故障类型来看,沿面放电是影响其正常运行的重要因素。由于液氮环境的低温特性,需重新选择适用于液氮的绝缘材料,并研究其沿面放电特性。前期研究已经验证了尼龙材料在经过处理后可以作为液氮中的外绝缘材料使用,该文对尼龙材料在液氮中的沿面闪络特性进行实验研究。通过对同一表面进行多次闪络实验,证明尼龙具有良好的沿面闪络电压重复性。通过对不同间距下,液氮中尼龙棒和挤出成型的聚四氟乙烯棒沿面闪络电压测量,得到服从 Weibull分布0。1%放电概率的首次冲击闪络和爬电距离的关系,为高温超导装置的外绝缘设计提供有力的参考价值。The surface discharge is one of important factors to affect the operation condition of superconducting devices.Thereby,the research on surface flashover characteristics for the insulating materials under the low temperature environment of liquid nitrogen has significant meaning.Previous studies have shown that the nylon with specific treatment can be used as an insulating material in liquid nitrogen.This paper focuses on the surface flashover characteristics of nylon in liquid nitrogen and proves that the surface flashover voltages of nylon in liquid nitrogen have a good repeatability.By measuring the surface flashover voltages of nylon rod and extrusion molding teflo rod with different gap distances,the first impulsive flashover voltages with 0.1% Weibull probability are obtained with different gap distances.This study also provides a strong reference value for designing the external insulation of superconducting devices.

关 键 词：尼龙 液氮环境 冲击沿面放电 WEIBULL分布 

分 类 号：TM26[一般工业技术—材料科学与工程]