不同介质灭弧室串联的混合断路器仿真研究

提出采用真空与SF6灭弧室串联构成的混合式断路器应用于高压直流领域,充分利用真空介质恢复强度快和SF6介质恢复强度高的优点,在弧后初始阶段,真空灭弧室承受主要的暂态恢复电压(TRV),后期TRV主要由SF6灭弧室承担。搭建了混合式高压直流断路器的仿真分析模型,分析了弧后动态电压分布与动态绝缘特性配合,并研究了混合式高压直流断路器的电流转移过程。在电流转移过程中不同介质灭弧室在不同阶段承受TRV可以提高混合直流断路器的开断能力,得到了最佳配合工作方式。为混合式高压直流断路器的研究奠定了理论基础。

Simulation Study on Hybrid Circuit Breaker Composed of Two Arc Extinguishing Chambers in Series with Different Mediumi

A hybrid circuit breaker composed of vacuum and SF6 arc extinguishing chambers in series is proposed for high-voltage DC application.It takes full advantages of the fast medium recovery of vacuum and the high medium recovery strength of SF6.In the initial phase after arcing,the vacuum arc extinguishing chamber is subjected to the main transient recovery voltage(TRV),and in the later period,TRV is mainly borne by SF6 arc extinguishing chamber.A simulation model of the hybrid high-voltage circuit breaker is established to analyze the dynamic voltage distribution and dynamic insulation characteristics after arcing.Besides,the current transfer process of the hybrid HVDC circuit breaker is analyzed.It is shown that in the process of current transfer,the arc extinguishing chambers with different mediums can withstand TRV at different stages to improve breaking ability of hybrid DC circuit breakers and achieve the best working mode.This research may lay the theoretical foundation for the study of hybrid high-voltage DC circuit breakers.