The development of vacuum relay technique in the world

国内外 真空 开关技术的发展概况

There have some abnormal phenomenal that the vacuum switch often refused departing and combining burned out gap switching and looping equipment of relay protection the switch jumped after changing the task .

改换工作后， 真空断路器常发生拒分、拒合、烧坏合闸线圈和 继电保护回路设备等问题，以及断路器跳跃、分合震动大等反常现象。

Automobile brake system most is double pipeline vacuum booster which relay system hydraulic braking power brake fluid strong absorbent .

汽车制动系统绝大多数是双管路 真空助力液压制动，其中 传递制动力的制动液有极强的吸水性。