C4F7N/CO2混合气体对局部不均匀电场的敏感特性

doi:10.19595/j.cnki.1000-6753.tces.190784

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摘要

电亲和性气体的放电电压对不均匀电场分布较敏感,高压电气设备电极表面存在的表面粗糙度效应会凸显,从而降低气体绝缘性能。C₄F₇N/CO₂混合气体是一种有潜力的SF₆替代气体,有必要研究C₄F₇N/CO₂对不均匀电场分布的敏感特性。该文从理论上分析电极表面粗糙引起的局部电场畸变,计算电场畸变程度对C₄F₇N/CO₂绝缘性能的影响,提出采用优异值来评估C₄F₇N/CO₂混合气体对不均匀电场的耐受能力。与SF₆气体对比,发现C₄F₇N/CO₂的优异值随C₄F₇N含量的降低而增大;当C₄F₇N体积分数低于20%时,C₄F₇N/CO₂混合气体的优异值比SF₆气体的优异值大。为验证计算结果,制作粗糙电极放电模型进行C₄F₇N/CO₂混合气体和SF₆气体的放电试验,获得了C₄F₇N/CO₂混合气体和SF₆气体的优异值,与计算结果接近。若采用C₄F₇N/CO₂混合气体的设备具有与采用SF₆气体相同的绝缘性能时,分析表明当C₄F₇N体积分数为4%~20%范围时,SF₆气体绝缘设备中电极表面粗糙度控制值6.3μm的标准适用于C₄F₇N/CO₂混合气体设备。

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关键词 ： C₄F₇N/CO₂混合气体, SF₆气体, 电极表面粗糙度, 气体放电, 优异值

Abstract：

The discharge characteristics of electron-attaching gases are sensitive to non-uniform electric field. However, it is difficult to make the electrode surface completely smooth in high-voltage electrical equipment. The effect of surface roughness of electrodes is prominent when the pressure is high, thus reducing the gas insulation performance. C₄F₇N/CO₂ gas mixture is a potential alternative gas to SF₆. It is necessary to investigate the sensitivity of C₄F₇N/CO₂ to inhomogeneous electric field distribution. In this paper, the local electric field distortion caused by rough electrode surface is analyzed theoretically, and the influence of electric field distortion on the insulation performance of C₄F₇N/CO₂ is calculated. The figure of merit is proposed to evaluate the tolerance of C₄F₇N/CO₂ gas mixture to inhomogeneous electric field. Compared with SF₆, when the content of C₄F₇N is less than 20%, the figure of merit of C₄F₇N/CO₂ mixture is higher than that of SF₆, which increases with the content of C₄F₇N decreasing. In order to verify the calculation results, a rough electrode discharge model was developed. The discharge tests of C₄F₇N/CO₂ and SF₆ gases were carried out. The figures of merit of C₄F₇N/CO₂ with 10% C₄F₇N content and SF₆ gases were obtained, which were close to the calculation results. Based on the figures of merit of C₄F₇N/CO₂ gas mixture, and considering the controlling requirement of electrode surface roughness in C₄F₇N/CO₂ gas mixture equipment with the same insulation performance as that of SF₆, it shows that as the content of C₄F₇N is in the range of 4%~20%, the controlling requirement of electrode surface roughness of 6.3μm in SF₆ equipment is suitable for the design of C₄F₇N/CO₂equipment.

Key words： C₄F₇N/CO₂gas mixture SF₆ gas electrode surface roughness gas discharge merit

收稿日期: 2019-06-30 出版日期: 2020-01-17

PACS:

TM56

基金资助:

国家重点研发计划（2017YFB0902500）和国家电网公司科技项目“环保型管道输电关键技术”资助

通讯作者: 颜湘莲女,1977年生,博士,教授级高级工程师,研究方向为高压开关设备技术研发和运维诊断。E-mail：yanxl@epri.sgcc.com.cn

作者简介: 郑宇男,1991年生,博士研究生,研究方向为电气设备中气体放电机理与试验。E-mail：zywhuee@whu.edu.cn

引用本文:

颜湘莲, 郑宇, 黄河, 杨圆, 周文俊, 柏长宇. C₄F₇N/CO₂混合气体对局部不均匀电场的敏感特性[J]. 电工技术学报, 2020, 35(1): 43-51. Yan Xianglian, Zheng Yu, Huang He, Yang Yuan, Zhou Wenjun, Bai changyu. Sensitivity of C₄F₇N/CO₂ Gas Mixture to Partial Inhomogeneous Electric Field. Transactions of China Electrotechnical Society, 2020, 35(1): 43-51.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190784 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I1/43

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