Gating control apparatus wherein static switches in the respective phase lines of a polyphase system are phase-sequence gated by a controlled gating signal

Claim 1

IN A POLYPHASE POWER TRANSMISSION APPARATUS WHICH INCLUDES A PLURALITY OF PHASE LINES FOR COUPLING AN ALTERNATING CURRENT SOURCE TO A LOAD AND WHEREIN THERE IS A STATIC SWITCH IN EACH OF SAID PHASE LINES, EACH SWITCH HAVING A CONTROL ELECTRODE AND BEING ADAPTED TO ASSUME A CONDUCTIVE STATE IN RESPONSE TO A GATING SIGNAL APPLIED TO ITS CONTROL ELECTRODE, AN ALTERNATING CURRENT ENERGIZABLE GATING SYSTEM FOR SUPPLYING DIRECT CURRENT GATING SIGNALS TO SAID CONTROL ELECTRODES, SAID GATING SYSTEM COMPRISING, INDIVIDUAL GATE SUPPLY MEANS FOR SUPPLYING THE CONTROL ELECTRODE OF EACH SAID STATIC SWITCH WITH A DIRECT CURRENT CONTINUOUS GATING SIGNAL, EACH SAID GATE SUPPLY MEANS COMPRISING AN ALTERNATING CURRENT TO DIRECT CURRENT RECTIFIER, A TRANSFORMER SECONDARY CIRCUIT COUPLED THROUGH SAID RECTIFIER TO THE CONTROL ELECTRODE OF ITS ASSOCIATED STATIC SWITCH, AND REACTIVE ENERGY STORAGE MEANS IN CIRCUIT WITH THE DIRECT CURRENT SIDE OF SAID RECTIFIER FOR MAINTAINING A PREDETERMINED MINIMUM DIRECT CURRENT ON THE CONTROL ELECTRODE OF THE ASSOCIATED STATIC SWITCH, A COMMON PRIMARY CIRCUIT COUPLED TO SAID TRANSFORMER SECONDARY CIRCUITS, AND CONTROL MEANS FOR SELECTIVELY ENERGIZING AND DEENERGIZING SAID PRIMARY CIRCUIT, SAID CONTROL MEANS COMPRISING A SUPPLY LINE FOR CONNECTING SAID PRIMARY CIRCUIT TO AN ALTERNATING CURRENT SOURCE, A UNIDIRECTIONAL CONTROLLABLE STATIC SWITCH ADAPTED TO CONDUCT IN RESPONSE TO A CONTROL SIGNAL APPLIED THERETO, AND A RECTIFIER HAVING ALTERNATING CURRENT INPUT TERMINALS AND DIRECT CURRENT OUTPUT TERMINALS, SAID ALTERNATING CURRENT INPUT TERMINALS BEING CONNECTED INTO SAID SUPPLY LINE, SAID UNIDIRECTIONAL SWITCH BEING CONNECTED ACROSS SAID DIRECT CURRENT OUTPUT TERMINALS.