电场不均匀系数对SF<sub>6</sub>/N<sub>2</sub>混合气体负直流电晕电流脉冲特性的影响

doi:10.19595/j.cnki.1000-6753.tces.201633

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摘要

为了研究SF₆/N₂混合气体负直流电晕电流脉冲特性,建立SF₆/N₂混合气体二维轴对称针-板几何模型,对不同电场不均匀系数下的负直流电晕放电进行了仿真计算。通过将放电过程中正离子、负离子和电子的连续性方程与泊松方程耦合,研究负电晕电流脉冲的形成机制,分析了电场不均匀系数对带电粒子变化过程和电流脉冲特征参数的影响,并通过针-板模型电晕放电实验平台验证了仿真模型的有效性。仿真结果表明,电流脉冲形成过程中,电子数密度远小于离子数密度,且正离子数密度大于负离子数密度;每个电流脉冲对应一个负离子云的形成和迁移,随着电场不均匀系数减小,由于针电极和负离子云之间的静电排斥,负电晕会呈现先偏离针尖发展、而后又向针尖回移的趋势;电流脉冲幅值整体呈增大趋势,初始电流脉冲宽度增大,脉冲上升时间和下降时间增长,同时脉冲重复率减小。

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	何彦良
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关键词 ：负直流电晕, 电流脉冲, 电场不均匀系数, SF₆/N₂混合气体, 针-板模型

Abstract：

In order to investigate the current pulse characteristics of negative DC corona in SF₆/N₂gas mixtures, a two-dimensional axisymmetric needle-to-plane geometry model in SF₆/N₂ gas mixtures was established, and the negative DC corona discharge under different electric field non-uniformity coefficients was simulated.By coupling the continuity equations of positive ion, negative ion and electron in the discharge with Poisson equation, the formation mechanism of negative corona current pulse was studied. The effect of electric field non-uniformity coefficient on the change process of charged particles and current pulse characteristic parameters was analyzed. The validity of simulation model was verified by the needle-to-plane model corona discharge experimental platform.The simulation results show that during the formation of the current pulse, the electron number density is much smaller than the ion number density, and the positive ion number density is greater than the negative ion number density.Each current pulse corresponds to the formation and drift of a negative-ion cloud.With decreasing the electric field non-uniformity coefficient, the negative corona will deviate from the needle tip first and then move back to the needle tip due to the electrostatic repulsion between the needle electrode and the negative-ion cloud.The pulse amplitude shows an overall increasing trend, the initial pulse duration increases, the rise time and fall time of pulse increase,and the pulse-repetition rate decreases.

Key words： Negative DC corona current pulse electric field non-uniformity coefficient SF₆/N₂ gas mixtures needle-to-plane model

收稿日期: 2020-12-11

PACS:

TM851

基金资助:

国家自然科学基金（51777164）和中央高校基本科研专项资金（xtr042019009, PY3A083）资助项目

通讯作者: 孙安邦,男,1984年生,博士,教授,博士生导师,研究方向为放电等离子体技术及其应用、低温等离子体数值仿真和电推进技术。E-mail：anbang.sun@xjtu.edu.cn

作者简介: 何彦良,男,1992年生,博士研究生,研究方向为绝缘气体放电机理和高电压试验技术。E-mail：ylhe2666@163.com

引用本文:

何彦良, 丁未, 孙安邦, 张冠军. 电场不均匀系数对SF₆/N₂混合气体负直流电晕电流脉冲特性的影响[J]. 电工技术学报, 2021, 36(15): 3124-3134. He Yanliang, Ding Wei, Sun Anbang, Zhang Guanjun. Effect of Electric Field Non-Uniformity Coefficient on Current Pulse Characteristics of Negative DC Corona in SF₆/N₂Gas Mixtures. Transactions of China Electrotechnical Society, 2021, 36(15): 3124-3134.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201633 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I15/3124

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