【摘要】 对FK—口型辅助开关灭弧室进行二维数学建模,分析其内部电场强度分布,推导出电流过零后介质击穿的判断条件,对灭弧室结构进行优化,达到降低电场强度,使电场分布趋于均匀的目的,为辅助开关的优化设计提供了有效的解决方法。更多还原

【Abstract】 In order to reduce the electric field maximum and homogenize the electric field distribution,a two-dimensional numerical model for arc-quenching chamber of FK—square auxiliary switch was established to analyze the internal electric field distribution.Based on electric-field simulation,we know that the electric field distribution is uneven,and maximum is located at the interval between moving and static contacts.It was the weak spot for dielectric breakdown.To improve the breaking capacity,the dielectric strength is calculated using a bit uneven electric field theory,and a judgment condition of dielectric breakdown after current was zero was given.The dielectric strength is in inverse proportion to electric field.To avoid the breakdown failure,the shape of contacts and wall structure of arc-quenching chamber are optimized.By optimization,we know that the contact shape has more influence on electric field distribution.Finally,by the total optimization,the electric strength is decreased,arcing performance is improved,and that was tested by experiment.The research provides the direction for optimization design of auxiliary switch.更多还原