摘要
寻找替代SF6应用于直流气体绝缘金属封闭输电线路(GIL)中的环保型气体成为近年来电力领域的研究热点,而C3F7CN是一种具有良好替代前景的气体。本文试验研究了均匀电场下0.3~0.7MPa气压范围内C3F7CN含量为8%~16%的C_3F_7CN/N_2混合气体的直流击穿特性,并将结果与SF6气体、SF6/N2混合气体和C3F7CN/CO2混合气体对比。试验结果及分析表明:C_3F_7CN/N_2混合气体的正、负极性直流击穿电场强度均随着气压下降而降低,随着混合气体中C3F7CN含量增加提高了20%,0.7MPa下14%C3F7CN/86%N2的负极性击穿电场强度达到0.4MPa下SF6的87.3%,相同气压下,直流击穿电场强度以8%C3F7CN/92%N2混合气体最低,8%C3F7CN/92%CO2混合气体其次,20%SF6/80%N2混合气体最高。采用X射线光电子能谱(XPS)对金属电极表面的固体放电副产物进行分析,获得了C_3F_7CN/N_2混合气体放电过程中气体与电极可能发生的反应。
In recent years,finding environment-friendly gases substituted to SF6 in DC GIL has become a hot issue in the electricity field,and C3F7CN is one of the potential substitutes.In this paper,the DC breakdown characteristics of C3F7CN/N2 gas mixtures under uniform electric field were studied and the results were compared with SF6,SF6/N2 gas mixtures and C3F7CN/CO2 gas mixtures.The content of C3F7CN was 8%~16%with the gas pressure range from 0.3MPa to 0.7MPa.The results and analysis showed that the positive and negative DC breakdown field strengths of C3F7CN/N2 gas mixture decrease with the decrease of gas pressure.With the increase of C3F7CN content in the mixed gas by 20%,the negative breakdown field strength of 14%C3F7CN/86%N2 at 0.7MPa reaches 87.3%of SF6 at 0.4MPa.At the same gas pressure,the DC breakdown field strength of 8%C3F7CN/92%N2 gas mixture is the lowest,8%C3F7CN/92%CO2 is higher,and 20%SF6/80%N2 is the highest.Through X-ray photoelectron spectroscopy(XPS)detection,the discharge by-products on the electrodes surface were analyzed and the possible reactions process between C3F7CN/N2 gas mixture and electrodes were obtained.
作者
屠幼萍
艾昕
成毅
金花
王璁
Tu Youping;Ai Xin;Cheng Yi;Jin Hua;Wang Cong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;Beijing Key Laboratory of High Voltage&Electromagnetic Compatibility North China Electric Power University Beijing 102206 China;School of Control and Computer Engineering North China Electric Power University Beijing 102206 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第22期5189-5195,共7页
Transactions of China Electrotechnical Society
基金
国家重点基础研究发展计划(973计划)(2014CB239502)
中央高校基本科研业务费专项资金(2018MS005)资助项目
