35kV真空灭弧室最佳开距的研究

Research on the Most Efficient Separation for 35kV Vacuum Interrupters

利用合成回路对外屏蔽罩式杯状纵磁触头结构的35kV真空灭弧室进行了研究.不同开距下的试验结果表明,35kV真空灭弧室存在着一个最佳的开距范围,在此范围内,弧后重燃次数较少,且弧后耐压水平较高.对试验结果进行了分析后指出了缩小目前国内35kV电压等级真空断路器的灭弧室开距的必要性.

A synthetic circuit is used in tests to measure and research 35kV exposed shield vacu-um interrupters with cupped axial magnetic field type electrodes. The experimental results under vari-ous separation showed that there is a limitation of the best separation for 35kV vacuum interrupters. In this range, the probability of reignition is lower and the post zero withstand-voltage is higher. This pa-per analyzes the experimental results and points out that it is necessary to reduce the electrode separa-tion of domestic vacuum interrupters.