Partial Discharge Initial Characteristics of SF6/N2 Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage

被引：0
|
作者：
Pang P. [1 ]
Sun Z. [1 ]
Zhang Q. [1 ]
Hou Z. [1 ]
Zhang X. [1 ]
Sun S. [1 ]
Li J. [1 ]
机构：
[1] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2019年 / 53卷 / 04期
关键词：
Gas insulated line; Partial discharge initial voltag; Pressure; Voltage polarity;
D O I：
10.7652/xjtuxb201904007
中图分类号：
学科分类号：
摘要：
To solve the problems of high greenhouse effect and high price of SF6 in DC gas insulated line (GIL), a solution scheme of mixing SF6 and N2 is proposed. Aiming at the extremely inhomogeneous electric field, a DC high voltage test platform is constructed to analyze the initial discharge characteristics of different SF6/N2 ratios under different voltage polarities and gas pressures. The results show that in the case of 0.3 MPa, the partial discharge initial voltage (U0) of SF6/N2 mixture is higher than that of SF6 when electric distortion is really serious, and the more serious the electric field distortion is, the less the SF6 is needed. For 20 μm and 50 μm electrode tip, the gas relative dielectric strength k trends towards φ(SF6), and its curve shape is doublet; for 100 μm, 120 μm and 160 μm tip, the shape is singlet, and k value under negative voltage is larger than that under positive voltage. For 20 μm tip in 20% SF6, when pressure is between 0.1 MPa and 0.3 MPa, the U0 of SF6/N2 is larger than that of SF6, and when pressure is 0.4 MPa, the U0 of SF6/N2 is 95% of that of SF6. © 2019, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：44 / 50
页数：6
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