高电压技术2019，Vol.45Issue(4)：1101-1107,7.DOI:10.13336/j.1003-6520.hve.20181121008
C4F7N/CO2混合气体在均匀和极不均匀电场下的工频绝缘性能
Power Frequency Insulation Performance of C4F7N/CO2 Mixture Under Uniform and Extremely Non-uniform Electric Field
摘要
Abstract
C4F7 N/CO2 mixture gas, which possesses a high dielectric strength and low coefficient of the greenhouse effect, has attracted attention as a potential alternative gas to SF6. We studied the effects of pressure and the ratio of mixture on the power frequency breakdown voltage of the C4F7 N/CO2 through power-frequency breakdown tests under uniform and extremely non-uniform electric field. Results show that the breakdown voltage of C4F7 N/CO2 mixtures increases linearly with the gas pressure under the uniform electric field in the pressure range of 0.1～0.4 MPa, and the N-curve characteristic of breakdown voltage appears under the extremely non-uniform electric field. The dielectric strength of7％C4F7 N/93％CO2 mixtures under a uniform electric field is about 0.8 times that of SF6. The C4F7 N/CO2 mixed gas which contains 9％～13％ C4F7 N has a power frequency insulation strength equivalent to that of SF6. Under an extreme non-uniform electric field, the breakdown voltage of the 7％～13％ C4F7 N/CO2 mixtures can still reach 0.79～0.86 times that of SF6. Comparison of the power frequency breakdown voltage with the breakdown voltage of SF6 reveals that the ratio of 7％ to 13％ of C4F7 N/CO2 gas mixture has the potential to replace SF6 gas.关键词
C4F7N/CO2混合气体/工频试验/工频绝缘强度/均匀电场/极不均匀电场/驼峰Key words
C4F7N/CO2 gas mixture/power frequency test/power frequency insulation strength/uniform electric field/extremely non-uniform electric field/N-curve引用本文复制引用
王凌志,周文俊,张天然,刘伟,胡世卓,喻剑辉..C4F7N/CO2混合气体在均匀和极不均匀电场下的工频绝缘性能[J].高电压技术,2019,45(4):1101-1107,7.基金项目
国家重点研发计划 (2017YFB0902500) （2017YFB0902500）
国家电网公司总部科技项目 (环保型管道输电关键技术) （环保型管道输电关键技术）
