It is recognized that the gas density relay can reflex the gas density in gas insulated electric equipment correctly and the pressurerelay cant do the same.
一般认为气体密度继电器可以正确反映气体绝缘电气设备的气体密度，而压力继电器则不能。
2
The authors introduce the troubles inspection methods of the manual control switch, speed control switch, gas-pressure control switch and relay box of electromagnetic retarders used in Yutong coaches.
介绍宇通客车电涡流缓速器手控开关、速度控制开关、气压控制开关、继电器盒等故障的检测方法。
3
The way of installing QJ-40 gas-pressurerelay and the oil injection craftwork of transformer are key influencing factors.