Patent ID: 7322788

Claim:
A protection system for a turbo machine which detects an abnormality by an abnormality detecting unit having an emergency governor provided on a rotation shaft of the turbo machine and a latch mechanism constituted of a trip finger and a trip rod in such a manner that when the rotation shaft of the turbo machine rotates to exceed a predetermined speed and a centrifugal force of a predetermined value or larger is applied to the emergency governor, the emergency governor and the trip finger come in contact and the latch mechanism is disengaged to move the trip rod, and closes a steam valve placed on a steam inlet of the turbo machine to shut off flow-in of steam into the turbo machine, comprising: a detecting device configured to mechanically detect movement of the trip rod to generate an electrical abnormality signal; and a solenoid valve which is placed integrally on a drive unit constituted of a piston and cylinder which open and close the steam valve and a hydraulic system which introduces/discharges operating oil to/from inside of the cylinder, and discharges the operating oil from inside of the cylinder, wherein, based on the electrical abnormality signal from said detecting device, said solenoid valve is electrically actuated to discharge the operating oil inside the cylinder to close the steam valve.