The emergency shutdown device of the hydro-generator governor should not only meet the requirements of "power loss action" in the 25 anti-accident measures, but also avoid the hidden danger of unplanned outage of the unit caused by the electromagnetic valve coil of the device being charged for a long time and easy to burn. This paper introduces three generations of technical improvement of the emergency shutdown device of hydro-generator governor of a large hydropower station, from double electromagnet two-position solenoid valve, single electromagnet spring return two-position solenoid valve to double solenoid valve and linkage valve, expounds their working principle and compares their respective advantages and disadvantages. It is proved that the emergency stop device of hydro-generator governor based on double solenoid valve and linkage valve is a practical and reliable emergency stop control optimization scheme of speed regulating system, which has great popularization value in hydropower plants.

water wheel generator  /  governor of speed  /  emergency stop device  /  double solenoid valve  /  linkage valve