Regulating system for turbines

Claim 1

IN A POWER PLANT HAVING A TURBINE, AN ELECTRIC GENERATOR COUPLED TO AND SYNCHRONOUSLY DRIVEN BY SAID TURBINE, POWER MEDIUM SUPPLY MEANS CONNECTED TO SAID TURBINE, AND CONTROL MEANS FOR CONTROLLING THE ADMITTANCE OF SAID POWER MEDIUM TO SAID TURBINE, THE COMBINATION OF A TURBINE REGULATING SYSTEM COMPRISING A PLURALITY OF SENSOR MEANS RESPONSIVE TO GIVEN RESPECTIVE OPERATING CRITERIA OF THE PLANT, ONE OF SAID SENSOR MEANS BEING RESPONSIVE TO THE SPEED OF SAID GENERATOR AND ANOTHER ONE OF SAID SENSOR MEANS BEING RESPONSIVE TO THE POWER OUTPUT OF SAID GENERATOR, AN ELECTROHYDRAULIC ACTUATOR COUPLED WITH SAID CONTROL MEANS AND HAVING ELECTRIC MEANS FOR CONTROLLING THE OPERATION OF SAID CONTROL MEANS, AT LEAST TWO COMPONENT FEEDBACK REGULATOR CIRCUITS CONNECTED TO SAID ELECTRIC MEANS OF SAID ACTUATOR, ONE OF SAID REGULATOR CIRCUITS HAVING AN OUTPUT AND AN INPUT CONNECTED TO SAID SPEED-RESPONSIVE SENSOR MEANS FOR SPEED REGULATION OF SAID TURBINE, THE OTHER OF SAID REGULATOR CIRCUITS HAVING AN OUTPUT AND AN INPUT CONNECTED TO SAID POWERRESPONSIVE SENSOR MEANS FOR REGULATING THE DELIVERED POWER OF SAID TURBINE, AND DISCRIMINATOR MEANS CONNECTED BETWEEN THE OUTPUTS OF SAID COMPONENT FEEDBACK REGULATOR CIRCUITS AND THE ELECTRIC MEANS OF SAID ACTUATOR FOR SELECTIVELY CONNECTING ONE OF SAID REGULATOR CIRCUITS TO AND SIMULTANEOUSLY DISCONNECTING THE OTHER OF SAID REGULATOR CIRCUITS FROM THE ELECTRIC MEANS OF SAID ACTUATOR IN DEPENDENCE UPON GIVEN PLANT-OPERATION CONDITIONS.