Influence of Buffer Gases on Breakdown Characteristics and Tolerant Capability of Insulation Defects in C4F7N Gas Mixtures Under Lightning Impulse

被引：0

作者：

Song J. ^{[1
]}

Zhang Q. ^{[1
]}

Li X. ^{[1
]}

Yuan X. ^{[1
]}

Su Z. ^{[2
]}

Dong Q. ^{[3
]}

机构：

[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an

[2] Electric Power Research Institute, State Grid Anhui Electric Power Company, Hefei

[3] China Electric Power Research Institute, Haidian District, Beijing

来源：

Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 04期

关键词：

Breakdown characteristics; Buffergases; C[!sub]4[!/sub]F[!sub]7[!/sub]N gas mixtures; Lightning impulse; SF[!sub]6[!/sub] substitute;

D O I：

10.13335/j.1000-3673.pst.2019.2684

中图分类号：

学科分类号：

摘要：

Reasonable selection of buffer gas type is significant for the application of C4F7N gas mixtures in GIS/GIL. Thus, we study the effects of buffer gases (CO2, N2, and Air) on the breakdown characteristics of C4F7N binary gas mixtures under lightning impulse.Firstly the influence of electric distribution was investigated, and a defect tolerance coefficient DTis used to characterize the sensitivity of a gas medium to the insulation defects. Then the feasibility of C4F7N gas mixture with different buffer gases is discussed. The results show that C4F7N gas mixtures has an obvious polarity effect under lightning impulse. Since the breakdown voltage (U50%) in quasi-uniform electric field under negative lightning impulse (-LI) is lower than that under positive impulse, the basic insulation strength of C4F7N gas mixture is determined by U50% under -LI. The basic insulation strengths of different gas mediums are ranked as follows, C4F7N/Air≈C4F7N/CO2≈90%∙SF6> C4F7N/ N2. Under non-uniform electric field, U50% decreases dramatically. It is found that DT (C4F7N/CO2)>DT (C4F7N/Air)>DT(C4F7N/N2). In conclusion, the basic insulation strength of C4F7N/CO2is the highest, while the DT of C4F7N/CO2is the largest, indicating that this gas mixture has the strongest capability to tolerate insulation defects. Thus, among CO2, N2, and air, CO2is the most suitable as a buffer gas of C4F7N. © 2021, Power System Technology Press. All right reserved.

引用

页码：1626 / 1631

页数：5

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