Design of Opening Velocity for a Vacuum Interrupter With a Cup-type Axial Magnetic Field Contact Based on Vacuum Arc Anode Discharge Mode

被引：0
|
作者：
Han G. [1 ]
Yao X. [2 ]
Zhang C. [1 ]
Li H. [2 ]
Bi Y. [1 ]
Liu Z. [2 ]
机构：
[1] Pinggao Group Co., Ltd., Pingdingshan, 467001, Henan Province
[2] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province
来源：
| 2018年 / Chinese Society for Electrical Engineering卷 / 38期
关键词：
Cup-type AMF contact; Initial opening velocity; Intense arc mode; Vacuum arc;
D O I：
10.13334/j.0258-8013.pcsee.161428
中图分类号：
学科分类号：
摘要：
The nominal short-circuit current breaking capability of a vacuum circuit breaker (VCB) is closely correlated with the vacuum arc controlling technology and the opening velocity controlling technology. The goal of this paper is to determine an opening velocity for vacuum interrupters (VIs), with an application of axial magnetic field (AMF) contacts, based on the evolving of vacuum arc intense arc mode into diffuse arc mode. The influences of the opening velocity on the duration of the intense arc mode, the critical axial magnetic flux density, and the corresponding critical contact gap for the evolving from intense arc mode into diffuse arc mode were experimentally determined by applying different opening velocities and arcing time during the arcing process. Experimental results show that both the opening velocity and the arcing time have a significant influence on the evolvement of vacuum arc anode discharge mode. The higher the opening velocity, the easier for the intense arc mode evolving into the diffuse arc mode. The critical contact gap, the critical magnetic flux density, and the duration for the intense arc mode are all increasing with the increasing of the arcing current, during the evolvement of vacuum arc anode mode from intense arc mode into diffuse arc mode. The dependence of the critical contact gap on the opening velocity shows that there exists a peak critical contact gap, which corresponds to a threshold opening velocity. For the design of the opening velocity of the VCB, the preferred velocity should be the higher beyond the threshold opening velocity the better for the intense arc mode evolving into diffuse arc mode. The results of this paper theoretically contribute to the design of opening velocity of the VCB. © 2018 Chin. Soc. for Elec. Eng.
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页码：1264 / 1272
页数：8
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