Effect of Small Amount of O2 on Breakdown and Decomposition Characteristics of c-C4F8/N2 Mixture Gas

ZHANG Xiaoxing; DENG Zaitao; FU Mingli; ZHUO Ran; XIAO Song; LI Yi

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Effect of Small Amount of O₂ on Breakdown and Decomposition Characteristics of c-C₄F₈/N₂ Mixture Gas

更新时间：2025-12-08

- Effect of Small Amount of O₂ on Breakdown and Decomposition Characteristics of c-C₄F₈/N₂ Mixture Gas
- Vol. 45, Issue 3, Pages: 708-715(2019)
- 作者机构：
  
  1. 武汉大学电气与自动化学院
  2. 南方电网科学研究院有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：14 March 2019，
  
  Published：2019
- 稿件说明：
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ZHANG Xiaoxing, DENG Zaitao, FU Mingli, et al. Effect of Small Amount of O₂ on Breakdown and Decomposition Characteristics of c-C₄F₈/N₂ Mixture Gas[J]. 2019, 45(3): 708-715.
DOI：

ZHANG Xiaoxing, DENG Zaitao, FU Mingli, et al. Effect of Small Amount of O₂ on Breakdown and Decomposition Characteristics of c-C₄F₈/N₂ Mixture Gas[J]. 2019, 45(3): 708-715. DOI：

摘要

c-C

由于具有良好的绝缘性能和较低的温室效应潜能（GWP）值而得到了替代气体领域的广泛关注

但目前O

对c-C

击穿与分解特性的影响还鲜有研究。为此

通过试验比较了不同比例O

下c-C

的工频击穿特性和自恢复特性

分析了电极析出物成分和气体分解产物成分并讨论了c-C

分解的途径和机理。结果表明:O

会显著降低c-C

的工频击穿电压

含有体积分数3%的O

混合气体自恢复特性大幅降低;含有O

的c-C

击穿后会析出黑色物质

其组成元素主要为COF

为C的单质和C的氧氟化物;O

对c-C

的分解有促进作用

除生成更多CF

、C

等气体外

还额外产生大量有毒性和腐蚀性的COF

。综合绝缘特性和分解特性

c-C

不宜与干燥空气混合使用

实际使用时应严格控制c-C

混合气体中的氧气含量。

Abstract

Because of its good insulating properties and low GWP（greenhouse effect potential）value

c-C

gas has attracted wide attention.However

the effects of O

on the breakdown and breakdown Characteristics of c-C

have not been studied yet.Consequently

we compared the frequency breakdown characteristics and

self-recovery characteristics of c-C

under different proportions of O

by experiments.Moreover

we analyzed the composition of the precipitates and the composition of the gas decomposition products

and discussed the decomposition mechanism of c-C

based on density functional theory.The results show that the frequency breakdown voltage of c-C

will be significantly reduced when O

is added.Compared with the c-C

in the absence of O

the self recovery characteristics of mixed gas containing 3%O

is greatly reduced.After the breakdown of c-C

mixed gas containing O

the surface of the electrode precipitates a black powdery substance whose main component is COF.The black powder consists of the elemental C and the oxygen fluoride of C.Meanwhile

can contribute to the decomposition of c-C

decomposing c-C

into more CF

and C

etc.

additionally producing a large number of toxic and corrosive COF

gas.Considering insulation characteristics and decomposition characteristics

c-C

should not be mixed with dry air and the oxygen content in c-C

mixture should be strictly controlled in the actual use.

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