A gas turbine engine control system comprising a variable stator vane schedule for normal operation of the gas turbine engine. The system is configured to generate an arm signal indicating potential shaft break. Then the system is configured to alter the v...

The method involves operating a rotor (8) of a gas turbine (1) at a cooling speed to cool the gas turbine. The cooling speed is controlled as a function of critical temperature and/or time, where the critical temperature is a cooling-air temperature of the...

A single-shaft combined plant having an emergency shut-off oil system is provided. The emergency shut-off oil system is constituted such that when a steam governing valve tripping electromagnetic valve is opened, only a steam turbine is stopped; a master t...