Insulation Performance of C3F7CN / CO2 Gas Mixtures in Quasi-uniform Electric Field

被引：0
|
作者：
Zhang Y. [1 ,2 ]
Chen Q. [2 ]
Zhang X. [2 ]
Li Y. [2 ]
Zhang J. [2 ]
Xiao S. [2 ]
机构：
[1] Scientific Research Institute of Electric Power, Guizhou Power Grid Co., Ltd., Guiyang
[2] School of Electrical Engineering, Wuhan University, Wuhan
来源：
Zhang, Xiaoxing (xiaoxing.zhang@outlook.com) | 2018年 / Science Press卷 / 44期
关键词：
Breakdown characteristics; C[!sub]3[!/sub]F[!sub]7[!/sub]CN/CO[!sub]2[!/sub] gas mixtures; Newly environmental-friendly insulation gas; Quasi-uniform electric field; Synergistic effect;
D O I：
10.13336/j.1003-6520.hve.20180925006
中图分类号：
学科分类号：
摘要：
In recent years, C3F7CN has been widely concerned by researchers in the field of SF6 alternative gas as an environmental-friendly insulation medium. However, there are few systematic studies on the power frequency breakdown performance of C3F7CN/CO2 gas mixtures at present. In this paper, the power frequency breakdown and self-restoring characteristics of C3F7CN/CO2 gas mixtures were tested under the ball electrodes which were used to simulate quasi-uniform electric field. The influences of mixing ratios and gas pressures on the breakdown voltage and the synergistic effect between C3F7CN and CO2 were systematically analyzed and compared with that of SF6 under the same conditions. The study shows that the power frequency breakdown voltage of the gas mixtures with C3F7CN content of 2% to 8% increases linearly with the increase of gas pressure, and presents a saturation growth trend with the increase of the mixing ratio. When the content of C3F7CN is 2% or 8%, the power frequency breakdown voltage of C3F7CN/CO2 gas mixure can reach 50% and 75% of that of pure SF6 under the same conditions, respectively. C3F7CN has a good restoring insulation performance and has a certain synergistic effect when mixed with CO2. The research results confirm that C3F7CN/CO2 gas mixtures have a potential to replace SF6. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3158 / 3164
页数：6
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