Influence of Electric Field Non-uniformity on Breakdown Characteristics in C4F7N/CO2 Gas Mixtures Under Lightning Impulse

SONG Jiajie; LI Xiaoang; Lü Yufang; YUAN Xieyu; ZHANG Qiaogen; SU Zhenxi

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Influence of Electric Field Non-uniformity on Breakdown Characteristics in C₄F₇N/CO₂ Gas Mixtures Under Lightning Impulse

更新时间：2025-12-08

- Influence of Electric Field Non-uniformity on Breakdown Characteristics in C₄F₇N/CO₂ Gas Mixtures Under Lightning Impulse
- Vol. 46, Issue 4, Pages: 1372-1378(2020)
- 作者机构：
  
  1. 西安交通大学电力设备电气绝缘国家重点实验室
  2. 国网安徽省电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 April 2020，
  
  Published：2020
- 稿件说明：
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SONG Jiajie, LI Xiaoang, Lü Yufang, et al. Influence of Electric Field Non-uniformity on Breakdown Characteristics in C₄F₇N/CO₂ Gas Mixtures Under Lightning Impulse[J]. 2020, 46(4): 1372-1378.
DOI：

SONG Jiajie, LI Xiaoang, Lü Yufang, et al. Influence of Electric Field Non-uniformity on Breakdown Characteristics in C₄F₇N/CO₂ Gas Mixtures Under Lightning Impulse[J]. 2020, 46(4): 1372-1378. DOI：

摘要

不同电场分布下混合气体雷电冲击放电特性是气体绝缘金属封闭输电线路（GILs）的设计基础

文中分别研究了稍不均匀电场（电场不均匀度系数f=1.6）和极不均匀电场（f=5.3和f=10.3）下C

N/CO

混合气体雷电冲击放电特性的变化规律。结果表明:稍不均匀场中

N/CO

混合气体的放电电压在高气压下出现微弱的饱和趋势

当气压小于0.4MPa时

其相对于在0.4MPa下SF

的绝缘强度达到了最大值

即随气压的升高

混合气体的相对绝缘性能并无显著提升;随着电场不均匀度的增大

N/CO

混合气体放电电压显著下降

且正极性放电电压远低于负极性

表现出对电场不均匀的极高敏感性;由此定义了电场敏感系数S

以表征绝缘介质在存在电场集中时放电电压的下降程度

研究结果表明

雷电冲击下气体介质对电场不均匀度的敏感性表现为C

N/CO

（5%～20%）>SF

>CO

。

Abstract

The lightning impulse breakdown characteristics in gas mixtures under different electric field distributions are the design basis of gas-insulated equipment. Consequently

we investigated the lightning impulse breakdown characteristics of C

N/CO

gas mixtures under lightning impulse in a quasi-uniform electric field（the factor of inhomogeneous field f=1.6） and an extremely non-uniform electric field（the factor of inhomogeneous field f=5.3 and 10.3）. The research indicates that

the breakdown voltage of C

N/CO

gas mixtures increases linearly with increase of gas pressure in quasi-uniform electric field

and the saturated trend of breakdown voltage effect appears at high pressure. Its insulation strength relative to SF

reaches its maximum at 0.4 MPa

that is

with the increase of air pressure

the relative insulation performance of mixed gases does not improve significantly. With the increase of the electric field non-uniformity

the breakdown voltage decreases significantly. The positive breakdown voltage is much lower than the negative. The sensitivity coefficient S is defined to characterize the decrease of discharge voltage of insulating medium when electric field is concentrated. The comparative analysis shows that the sensitivity of impulse breakdown characteristics of gas to electric field non-uniformity is C

N/CO

（5～20%）>SF

>CO

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