危急遮断器 meaning in Chinese

emergency governet／intercepter
emergency governor overspeed governor

As we know , overspeed protection system is one of main protection of steam turbine sets . base on the standing order , we must do oil filler test regularly , but the oil filler test of the emergency stop system , which made by shanghai turbine company ltd . , is often fails in stroke
超速保护系统是汽机主要保护之一，根据规程规定，要定期进行注油试验以验证超速保护的可靠性，但上海汽轮机厂所产的危急遮断器在注油试验中经常拒动，导致在运行中无法进行注油试验，无法验证超速保护系统的可靠性。