Influence of Electric Field Non-uniformity on Breakdown Characteristics in C4F7N/CO2 Gas Mixtures Under Lightning Impulse

被引：0

作者：

Song J. ^{[1
]}

Li X. ^{[1
]}

Lü Y. ^{[1
]}

Yuan X. ^{[1
]}

Zhang Q. ^{[1
]}

Su Z. ^{[2
]}

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

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 04期

关键词：

Breakdown characteristics; C[!sub]4[!/sub]F[!sub]7[!/sub]N/CO[!sub]2[!/sub] gas mixtures; Electric field non-uniformity; Lightning impulse; SF[!sub]6[!/sub] substitute;

D O I：

10.13336/j.1003-6520.hve.20200430029

中图分类号：

学科分类号：

摘要：

The lightning impulse breakdown characteristics in gas mixtures under different electric field distributions are the design basis of gas-insulated equipment. Consequently, we investigated the lightning impulse breakdown characteristics of C4F7N/CO2 gas mixtures under lightning impulse in a quasi-uniform electric field(the factor of inhomogeneous field f=1.6) and an extremely non-uniform electric field (the factor of inhomogeneous field f=5.3 and 10.3). The research indicates that the breakdown voltage of C4F7N/CO2 gas mixtures increases linearly with increase of gas pressure in quasi-uniform electric field, and the saturated trend of breakdown voltage effect appears at high pressure. Its insulation strength relative to SF6 reaches its maximum at 0.4 MPa, that is, with the increase of air pressure, the relative insulation performance of mixed gases does not improve significantly. With the increase of the electric field non-uniformity, the breakdown voltage decreases significantly. The positive breakdown voltage is much lower than the negative. The sensitivity coefficient S is defined to characterize the decrease of discharge voltage of insulating medium when electric field is concentrated. The comparative analysis shows that the sensitivity of impulse breakdown characteristics of gas to electric field non-uniformity is C4F7N/CO2(5~20%)>SF6>CO2. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：1372 / 1378

页数：6

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