高电压技术2018，Vol.44Issue(6)：2019-2026,8.DOI:10.13336/j.1003-6520.hve.20180529039
真空断路器开断小电感电流下多次复燃现象的介质恢复过程分析
Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum
摘要
Abstract
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.关键词
真空断路器/小电感电流/多次复燃过电压/介质恢复/鞘层Key words
vacuum circuit breakers/small inductive current/multiple re-ignition overvoltage/dielectric recovery/sheath引用本文复制引用
王枫,王仲奕,郝萌萌,刘志远..真空断路器开断小电感电流下多次复燃现象的介质恢复过程分析[J].高电压技术,2018,44(6):2019-2026,8.基金项目
陕西省工业科技攻关项目(2015GY049). Project supported by Shaanxi Industrial Science and Technology Key Project(2015GY049). （2015GY049）
