摘要
低压限流断路器是广泛应用于工业与民用的低压电器。它采用多个栅片的灭弧室 ,利用近极压降将进入到灭弧室中的电弧电压提升到一个较高的值 ,从而在开断电路的同时还起到对短路电流的限制。但目前发现在开断过程中电弧反复进出灭弧栅片的背后击穿现象引起电弧电压的突降 ,降低了开断性能。根据实际开断物理过程 ,建立了以热击穿为主的背后击穿物理模型 ,运用气流场 ,结合热场、磁场与电流分布 ,计算模拟了低压限流断路器在开断过程中电弧运动状况与背后击穿现象。
Low voltage current limiting circuit breaker is widely used in industrial and domestic installations. With a chutes arc quenching chamber, current limiting circuit breaker can lift the arc voltage to a high value through polar voltage drop and limit the short circuit current while interrupting circuit. Now the back commutation, during which arc moves in and out of chutes, leads to arc voltage drop and worsen the performance of circuit breaker. In the paper, a back commutation mathematical model based on heat restrike is built according to the interrupting process. Solving differential equations for the mass, momentum and heat balance, the back commutation of low voltage current limiting circuit breaker is simulated.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2000年第3期16-19,60,共5页
Proceedings of the CSEE
基金
国家自然科学基金!5 97770 0 9
西安交通大学博士学位论文基金
