【填空题】
59.XPD型配电箱电气原理？*论述题*___
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答案
当开关ZDK合上时，电源经主熔断器ZRQ向车厢送电[母车]，合上连接开关则向子车送电。若本车系子车，经连接开关由其它母车向本车送电，各用电器[包括终夜灯、半夜灯、电风扇、水泵、插座等]只要将所属开关合上就可使用使用。当用电线路发生过载或短路时，自动空气开关在一定时间内会自动断开，或保险片熔断，起到保护电器及线路的作用，防止火灾发生。
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