Power Frequency Insulation Performance of C4F7N/CO2 Mixture Under Uniform and Extremely Non-uniform Electric Field

被引：0

作者：

Wang L. ^{[1
]}

Zhou W. ^{[1
]}

Zhang T. ^{[1
]}

Liu W. ^{[2
]}

Hu S. ^{[1
]}

Yu J. ^{[1
]}

机构：

[1] School of Electrical Engineering and Automation, Wuhan University, Wuhan

[2] Anhui Electric Power Research Institute of SGCC, Hefei

来源：

Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 04期

基金：

国家重点研发计划;

关键词：

C[!sub]4[!/sub]F[!sub]7[!/sub]N/CO[!sub]2[!/sub] gas mixture; Extremely non-uniform electric field; N-curve; Power frequency insulation strength; Power frequency test; Uniform electric field;

D O I：

10.13336/j.1003-6520.hve.20181121008

中图分类号：

学科分类号：

摘要：

C4F7N/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 C4F7N/CO2 through power-frequency breakdown tests under uniform and extremely non-uniform electric field. Results show that the breakdown voltage of C4F7N/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 of 7%C4F7N/93%CO2 mixtures under a uniform electric field is about 0.8 times that of SF6. The C4F7N/CO2 mixed gas which contains 9%~13% C4F7N 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% C4F7N/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 C4F7N/CO2 gas mixture has the potential to replace SF6 gas. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：1101 / 1107

页数：6

共 30 条

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