基于数值分析的铁路真空断路器灭弧室的优化设计

Optimal Design on Chamber for Vacuum Circuit Breaker

"电气化铁道智能选相控制永磁操动真空断路器"是根据断路器的发展趋势结合电气化铁道的需求而研制的.根据牵引变电站的运行特点,通过对真空断路器基本组成元件真空灭弧室的讨论,分析真空灭弧室内部的电场分布,对其结构进行了优化,将瓷壳台放在静端并金属化,使瓷壳的凸台与屏蔽筒等电位,减小了卡圈狭缝处以及触头之间的电场的冲击,避免了灭弧室在长期的运行中被电场击穿的情况,大大提高了灭弧室的绝缘特性及其开断能力.

According to the requirement of the electric railway substation, a phase-control vacuum circuit breaker with permanent magnet mechanism of electric railway substation is developed. Based on the operational features of traction substation, internal electric field distribution is analyzed, and the structure of the chamber is optimized. Putting the ceramic shell on the quiet side and metalizing it obtain equal potentials of the ceramic shell and shielding tube to reduce electric field impact and avoid chamber breaking in the long-term operation, which greatly improves the insulating properties and the breaking capacity of chamber.