Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum

被引：0
|
作者：
Wang F. [1 ]
Wang Z. [2 ]
Hao M. [3 ]
Liu Z. [4 ]
机构：
[1] Department of Electrical and Control Engineering, Xi'an University of Science & Technology, Xi'an
[2] Department of Electrical Engineering, Xi'an Jiaotong University, Xi'an
[3] Siemens Electric Drive Equipment Co., Shanghai
[4] State Key Laboratory of Electric Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
来源：
Gaodianya Jishu/High Voltage Engineering | 2018年 / 44卷 / 06期
关键词：
Dielectric recovery; Multiple re-ignition overvoltage; Sheath; Small inductive current; Vacuum circuit breakers;
D O I：
10.13336/j.1003-6520.hve.20180529039
中图分类号：
学科分类号：
摘要：
Multiple re-ignition overvoltage is determined by dielectric recovery strength after interruption of small inductive currents in vacuum. We established a micro-physical model for small inductive current interruption in vacuum, with which the influence of load parameters on the re-ignitions can be determined, so as to reveal the sheath development process after interruption of small inductive current in vacuum. The following micro-parameters were determined, including the ion density, ion speed, development of electric field, and potential distribution under various TRVs. A critical electric field strength at the cathode was chosen as a criterion for the re-ignition. The simulation results show the following influence of load parameters on the re-ignitions of small current inductive current interruption in vacuum. A higher load capacitance or a higher load inductance will decrease the sheath development speed and the maximum field strength, which decreases the overvoltage and the risk of re-ignition. The sheath speed and the maximum field strength does not change with the increase of the equivalent resistance, but the load current decreases with the increase of the equivalent resistance. A lower load current reduces sheath velocity, which results in a lower maximum electric field strength. Therefore, it decreases the risk of re-ignition. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：2019 / 2026
页数：7
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