Control system

Claim 1

IN AN ARRANGEMENT COMPRISING A PLURALITY OF AUTOMATIC EXTRACTION TYPE ELASTIC FLUID MULTI-STAGE TURBINES, AT LEAST ONE OF SAID TURBINES BEING ADAPTED TO BE A MASTER TURBINE WHICH IS ELECTRICALLY CONTROLLED, THE OTHER OF SAID TURBINES BEING OF THE MECHANICALLY CONTROLLED TYPE, EACH OF SAID TURBINES COMPRISING INLET VALVE MEANS GOVERNING THE FLOW OF FLUID TO THE TURBINE, EXTRACTION CONDUITS CONNECTED TO INTERMEDIATE STAGES OF THE TURBINE, EXTRACTION VALVE MEANS WHICH GOVERNS THE PROPORTION OF FLUID WHICH FLOWS FROM PROXIMAL INTERMEDIATE STAGES TO DISTAL INTERMEDIATE STAGES, AND EXTRACTION FLUID HEADERS COMMON TO ALL OF THE TURBINES OF SAID ARRANGEMENT; THE COMBINATION COMPRISING FIRST MEANS RESPONSIVE TO SPEED OF SAID MASTER TURBINE FOR GENERATING A FIRST SIGNAL WHICH IS A FUNCTION OF SAID SPEED, SECOND MEANS RESPONSIVE TO THE PRESSURES IN SAID EXTRACTION HEADERS FOR GENERATING RESPECTIVE SECOND SIGNALS WHICH ARE FUNCTIONS OF THE PRESSURES IN SAID EXTRACTION HEADERS, MEANS IN CIRCUIT WITH SAID GENERATING MEANS FOR MODIFYING SAID FIRST SIGNAL WITH SAID SECOND SIGNALS AND FOR MODIFYING EACH OF SAID SECOND SIGNALS WITH SAID FIRST SIGNAL AND THE OTHERS OF SAID SECOND SIGNALS, A FIRST NETWORK CONTROLLED BY SAID MODIFIED FIRST SIGNAL FOR GOVERNING THE POSITION OF THE INLET VALVE MEANS OF SAID MASTER TURBINE, SECOND NETWORKS RESPECTIVELY CONTROLLED BY SAID MODIFIED SECOND SIGNALS FOR GOVERNING THE POSITIONS OF THE EXTRACTION VALVE MEANS OF SAID MASTER TURBINE, MEANS FOR SLAVING SAID OTHER TURBINES TO SAID MASTER TURBINE COMPRISING MEANS FOR PRODUCING FIRST REFERENCE VOLTAGES REPRESENTING GIVEN FRACTIONS RESPECTIVELY OF THE ELECTRICAL LOAD OF SAID ARRANGEMENT FOR EACH OF SAID OTHER TURBINES, MEANS FOR PRODUCING SECOND REFERENCE VOLTAGES REPRESENTING SELECTED FRACTIONS RESPECTIVELY OF EXTRACTION HEADER FLUID PROVIDED BY EACH OF SAID OTHER TURBINES, MEANS RESPECTIVELY RESPONSIVE TO THE APPLICATION THERETO OF SAID FIRST REFERENCE VOLTAGES AND SAID FIRST SIGNAL FOR PRODUCING MODIFIED FIRST VOLTAGES, MEANS RESPONSIVE TO THE APPLICATION THERETO OF SAID MODIFIED FIRST VOLTAGES, FOR ACTUATING THE MECHANICAL CONTROLS OF THE INLET VALVE MEANS OF SAID OTHER TURBINES TO CONTINUALLY MAINTAIN SAID SHARING OF SAID ELECTRICAL LOAD IN ACCORDANCE WITH SAID GIVEN FRACTIONS, MEANS RESPONSIVE TO THE APPLICATION THERETO OF SAID SECOND REFERENCE VOLTAGES AND SAID SECOND SIGNALS FOR PRODUCING MODIFIED SECOND VOLTAGES, AND MEANS RESPONSIVE TO THE APPLICATION THERETO OF SAID MODIFIED SECOND VOLTAGES FOR ACTUATING THE MECHANICAL CONTROLS OF THE EXTRACTION VALVE MEANS OF SAID OTHER TURBINES TO CONTROL THE PRESSURES IN SAID EXTRACTION HEADERS AND TO CONTINUALLY MAINTAIN SAID EXTRACTION FLUID FLOW FOR SAID TURBINES IN ACCORDANCE WITH SAID SELECTED FRACTIONS.