1. With widespread of dyadic handcart switchgear recently, it often happened that the switch contact temperature rising, even burning down to power failure owing to the touch head poor contact and the increasing contact resistance. This situation is more common in switchgear with large current.
近年来普遍使用的小车开关柜的开关触点经常因接触不良，接触电阻增大，而出现触点温升过高，甚至烧毁，造成停电的现象，这种情况在大电流开关柜中更为突出。