直流电场下C4F7N/CO2与SF6/N2混合气体中铝质球形自由微粒放电敏感度对比分析

doi:10.19595/j.cnki.1000-6753.tces.L80833

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摘要

直流气体绝缘金属封闭输电线路（GIL）充SF₆混合气体或SF₆替代气体时,其绝缘性能将受到自由金属微粒的影响。本文重点针对C₄F₇N/CO₂以及SF₆/N₂混合气体,开展绝缘强度的影响分析。选用的实验气体组份为：C₄F₇N/CO₂（4%/96%）、SF₆/N₂（其中SF₆比例分别为20%、30%、50%和70%）以及纯SF₆气体,在球-碗电极直流电场下,开展微粒影响下的气隙击穿实验。提出微粒放电敏感度（DSP）的概念及定义,用以评估不同组分气体绝缘强度对金属微粒导致的局部电场强度剧变的敏感程度。实验结果表明,在0.1~0.5MPa气压范围内,不存在微粒时,4%C₄F₇N/96%CO₂绝缘强度与30%SF₆/70%N₂混合气体相当;存在微粒影响时,4%C₄F₇N/96%CO₂混合气体的DSP值低于30%SF₆/70%N₂混合气体的,而高于20%SF₆/80%N₂混合气体的,且放电电流呈现双峰值特征。C₄F₇N/CO₂混合气体具有绝缘强度高、对微粒放电敏感度低的特性,这与C₄F₇N具有强电负性和高吸附系数有关。本文还结合微粒运动触发放电的物理模型,阐明了气隙击穿电流出现双峰特征的原因。

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	王靖瑞
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	李庆民

关键词 ：击穿电压, 球形自由金属微粒, 混合气体, 微粒放电敏感度, 击穿电流

Abstract：

The electrical performance of DC gas insulation transmission line (GIL) using SF₆ gas mixture or alternative gas as insulation medium will be deteriorated by free metal particles. The analysis of the factor affecting the insulation strength of SF₆/N₂ and C₄F₇N/CO₂ gas mixtures is mainly performed in this paper. The breakdown experiments with particle were conducted with the ball-bowl electrode under the DC electric field, which included different gas compositions such as C₄F₇N/CO₂ (4%/96%) gas mixture, SF₆/N₂ (volume ratio of SF₆ includes: 20%, 30%, 50%, and 70%, respectively) gas mixtures and pure SF₆ gas. The concept of Discharge Sensitivity by Particles (DSP) was proposed to evaluate the sensitivity of the insulation strength of different compositions gas to the electric field distortion caused by metal particles. The experiment results show that in the pressure range of 0.1 to 0.5MPa, the dielectric strength of 4%C₄F₇N/96%CO₂ is equivalent to that of 30%SF₆/70%N₂ in the absence of particle, while due to the presence of particles, the DSP of 4%C₄F₇N/96%CO₂ gas mixture is higher than that of 20%SF₆/80%N₂ gas mixture and lower than that of 30%SF₆/70%N₂ gas mixture, accompanied by the appearance of discharge current of double peak. The high dielectric strength and low sensitivity to particle discharge of C₄F₇N/CO₂ gas mixture is closely related to the strong electronegativity and high attachment coefficient of C₄F₇N. Combined with the physical model of moving particle-triggered discharge, the emergence of the double peak characteristics of gap breakdown current is also elaborated in this paper.

Key words： Breakdown voltage free spherical conducting particle gas mixture discharge sensitivity by particles (DSP) breakdown current

收稿日期: 2018-05-30 出版日期: 2018-10-30

PACS:

TM85

基金资助:

国家自然科学基金（51737005）、北京市自然科学基金(3172035)和中央高校基本科研业务费专项资金（2018MS165）资助项目

作者简介: 王靖瑞男,1996年生,硕士研究生,研究方向为GIL设备气体放电理论及其应用技术研究工作。E-mail: wang_jingrui@ncepu.edu.cn; 王健男,1985年生,博士,讲师,研究方向为GIL绝缘优化与机械承载能力方面的研究工作。E-mail: wangjian31791@ncepu.edu.cn（通信作者）

引用本文:

王靖瑞, 王健, 倪潇茹, 王璁, 李庆民. 直流电场下C₄F₇N/CO₂与SF₆/N₂混合气体中铝质球形自由微粒放电敏感度对比分析[J]. 电工技术学报, 2018, 33(20): 4682-4691. Wang Jingrui, Wang Jian, Ni Xiaoru, Wang Cong, Li Qingmin. Comparative Analysis of Discharge Sensitivity by the Free Spherical Aluminum Particle in C₄F₇N/CO₂ and SF₆/N₂ Gas Mixtures under DC Electric Field. Transactions of China Electrotechnical Society, 2018, 33(20): 4682-4691.

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