Analysis on Discharge Characteristics and Synergistic Effect of SF6/N2 Mixed Gas Under Lightning Impulse

被引：0
|
作者：
Mao G. [1 ]
Gao L. [1 ]
Zhang M. [1 ]
Li Z. [2 ]
Zhang R. [2 ]
Guo C. [3 ]
机构：
[1] State Grid Corporation of China, Beijing
[2] China Electric Power Research Institute, Beijing
[3] Electric Power Research Institute of State Grid Shaanxi Electric Power Company, Xi'an
来源：
Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 02期
关键词：
Mixed gas; Negative synergistic effect; Normalization coefficient; SF[!sub]6[!/sub]/N[!sub]2[!/sub; Synergistic effect;
D O I：
10.13336/j.1003-6520.hve.20200179
中图分类号：
学科分类号：
摘要：
SF6/N2 mixed gas, which is used as a simple and effective environmental protection measure for SF6, has been gradually applied to gas insulated power equipment such as gas insulated switchgear (GIS). A comprehensive study on discharge characteristics and synergetic effect under lightning impulse can provide a basis for insulation design and gas parameter selection, which has important academic research and engineering application values. In this paper, the discharge characteristics and synergistic effect of positive and negative polarity lightning impulse in quasi-uniform and highly inhomogenous electric field of SF6/N2 mixed gas were studied. It is found that, in a quasi-uniform electric field, there is a synergistic effect which is more significant under negative polarity. As the electric field non-uniformity increases, the type of synergistic effect changes from the synergistic to the negative synergistic. The method of synergistic effect coefficient C cannot fully describe the synergistic effect and negative synergistic effect of SF6/N2, therefore, an appropriate method of normalization coefficient h is proposed to quantitatively characterize the influence of electric field non-uniformity, voltage polarity, gas pressure and SF6 volume fraction. Some suggestions such as the optimal SF6 volume fraction of 20%~25% in GIS insulation design are proposed. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：674 / 680
页数：6
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