Partial Discharge Characteristics of the Surface Discharge in SF6/N2 of the Mixed Gas Under DC Voltage

被引：0
|
作者：
Hou Z. [1 ]
Guo R. [1 ]
Li J. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
来源：
Li, Junhao (junhaoli@mail.xjtu.edu.cn) | 1600年 / Chinese Machine Press卷 / 35期
关键词：
DC voltage; Gas insulated line; Mixed composition; N[!sub]2[!/sub; Partial discharge; SF[!sub]6[!/sub;
D O I：
10.19595/j.cnki.1000-6753.tces.190762
中图分类号：
学科分类号：
摘要：
Due to the greenhouse effect of SF6, more and more scholars are paying attention to the application of SF6/N2 mixed gas as the insulating medium in DC GIL. The surface defect is one of the common defects of GIL, so it is of great significance to study the partial discharge characteristics of SF6/N2 mixed gas under DC voltage. In this paper, the discharge signal is statistically counted by the pulse current method, and the initial partial discharge characteristics and the statistical characteristics of the discharge development stage of the mixed gas are studied. The results show that, when the pressure is in the range of 0.1~0.8MPa, as the pressure increases, the partial discharge inception voltage (PDIV) and the synergistic effect of the mixed gas increase, while the maximum discharge decreases. As SF6 content decreases, the PDIV increases, the sensitivity of PDIV growth rate to SF6 gas content decreases, and the synergistic effect of the mixed gas decreases. When the applied electric field is in the range of PDIV to 40kV, the average discharge amount increases in the low-pressure region with the increase of the applied electric field, and the increase in the high-voltage region with the applied electric field remains unchanged. The discharge repetition rate of the 50% SF6 mixed gas in the high-pressure region is higher than that in the low-voltage region, and the formation of discharge is suppressed as the discharge develops. The surface discharge has a polar effect, and the negative PDIV is smaller than the positive PDIV. © 2020, Electrical Technology Press Co. Ltd. All right reserved.
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页码：3087 / 3096
页数：9
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