电工技术学报2020，Vol.35Issue(1)：43-51,9.DOI:10.19595/j.cnki.1000-6753.tces.190784
C4F7N/CO2混合气体对 局部不均匀电场的敏感特性
Sensitivity of C4F7N/CO2 Gas Mixture to Partial Inhomogeneous Electric Field
摘要
Abstract
The discharge characteristics of electron-attaching gases are sensitive to non-uniform electric field. However, it is difficult to make the electrode surface completely smooth in high-voltage electrical equipment. The effect of surface roughness of electrodes is prominent when the pressure is high, thus reducing the gas insulation performance. C4F7N/C02 gas mixture is a potential alternative gas to SF6. It is necessary to investigate the sensitivity of C4F7N/C02 to inhomogeneous electric field distribution. In this paper, the local electric field distortion caused by rough electrode surface is analyzed theoretically, and the influence of electric field distortion on the insulation performance of C4F7N/C02 is calculated. The figure of merit is proposed to evaluate the tolerance of C4F7N/C02 gas mixture to inhomogeneous electric field. Compared with SF6. when the content of C4F7N is less than 20%, the figure of merit of C4F7N/C07 mixture is higher than that of SF6, which increases with the content of C4F7N decreasing. In order to verify the calculation results, a rough electrode discharge model was developed. The discharge tests of C4F7N/C02 and SF6 gases were carried out. The figures of merit of C4F7N/C02 with 10% C4F7N content and SF6 gases were obtained, which were close to the calculation results. Based on the figures of merit of C4F7N/C02 gas mixture, and considering the controlling requirement of electrode surface roughness in C4F7N/C02 gas mixture equipment with the same insulation performance as that of SF6, it shows that as the content of C4F7N is in the range of 4%-20%, the controlling requirement of electrode surface roughness of 6.3 μm in SF6 equipment is suitable for the design of C4F7N/C02 equipment.关键词
C4F7N/CO2混合气体/SF6气体/电极表面粗糙度/气体放电/优异值Key words
C4F7N/C02 gas mixture/SF6 gas/electrode surface roughness/gas discharge/ merit分类
信息技术与安全科学引用本文复制引用
颜湘莲1,郑宇2,黄河1,杨圆1,周文俊2,柏长宇3..C4F7N/CO2混合气体对 局部不均匀电场的敏感特性[J].电工技术学报,2020,35(1):43-51,9.基金项目
国家重点研发计划(2017YFB0902500)和国家电网公司科技项目"环保型管道输电关键技术"资助. （2017YFB0902500）
