Influence of Three Buffer Gases on Dielectric Strength of C<sub>4</sub>F<sub>7</sub>N Mixtures

HU Shizhuo; ZHOU Wenjun; ZHENG Yu; ZHANG Tianran; WANG Lingzhi; LI Zhibing

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Influence of Three Buffer Gases on Dielectric Strength of C₄F₇N Mixtures

更新时间：2025-12-08

- Influence of Three Buffer Gases on Dielectric Strength of C₄F₇N Mixtures
- Vol. 46, Issue 1, Pages: 224-232(2020)
- 作者机构：
  
  1. 武汉大学电气与自动化学院
  2. 中国电力科学研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 January 2020，
  
  Published：2020
- 稿件说明：
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HU Shizhuo, ZHOU Wenjun, ZHENG Yu, et al. Influence of Three Buffer Gases on Dielectric Strength of C₄F₇N Mixtures[J]. 2020, 46(1): 224-232.
DOI：

HU Shizhuo, ZHOU Wenjun, ZHENG Yu, et al. Influence of Three Buffer Gases on Dielectric Strength of C₄F₇N Mixtures[J]. 2020, 46(1): 224-232. DOI：

摘要

为研究C

N（全氟异丁腈）与CO

、N

和空气3种缓冲气体混合后作为绝缘介质替代SF

的潜力

在均匀电场下对C

N/CO

、C

N/N

和C

N/空气混合气体的工频绝缘性能进行了研究

其中混合气体气压为0.1～0.7MPa、C

N占比为5%～20%。对比了含不同缓冲气体的C

N混合气体绝缘特性

分析了气压和混合比例等因素对混合气体工频击穿电压的影响。试验结果表明

N/CO

和C

N/空气混合气体击穿电压随气压升高呈线性增长

而C

N/N

混合气体在较高气压下呈微弱的饱和趋势;3种C

N混合气体的工频击穿电压随混合比例的增加大致呈线性增长。C

N/CO

、C

N/N

和C

N/空气混合气体相对于SF

的绝缘强度随气压的变化并非定值

在0.4 MPa附近相对SF

绝缘强度存在极小值。C

N/N

混合气体在放电条件下的碳析出现象较为明显

严重时会导致C

N/N

混合气体击穿电压大幅下降。综合考虑C

N混合气体的绝缘性能、液化温度和放电条件下的碳析出程度

和空气是C

N适合的缓冲气体。

Abstract

In order to study the potential of C

N（perfluoroisobutyronitrile） mixed with three buffer gases CO

and air respectively as insulation mediums to substitute SF

the power frequency insulation performances of C

N/CO

N/N

and C

N/air mixtures were tested under uniform electric field. The gas pressures of mixtures range from 0.1 to 0.7 MPa

and the mixing percentages of C

N in mixtures are 5% to 20%. The insulation properties of C

N mixtures containing different buffer gases were compared

and the effects of gas pressure and mixing ratio on the breakdown voltage of different C

N mixtures were analyzed. The experimental results demonstrate that the breakdown voltage of C

N/CO

and C

N/air mixtures increases linearly with gas pressure

whereas the breakdown voltage of C

N/N

mixtures show weak saturation trends at higher gas pressures. The breakdown voltages of three kinds of C

N mixtures increase linearly with mixing ratios of C

N. The dielectric strength relative to SF

of C

N/CO

N/N

and C

N/air mixtures varying with pressure

is not constant

and reaches the minimum value near 0.4 MPa. The carbon precipitation of C

N/N

mixture under discharge is more obvious. When carbon heavily deposits on the electrode surface

the breakdown voltage of C

N/N

mixture will decrease significantly. When the insulation performance

liquefaction temperature and carbon precipitation under discharge conditions are taken into consideration

and air are suitable buffer gases of C

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AI问答

⁰

Influence of Three Buffer Gases on Dielectric Strength of C4F7N Mixtures

DOI：

摘要

Abstract

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Influence of Three Buffer Gases on Dielectric Strength of C₄F₇N Mixtures