Polyphase electrical converter equipment

Claim 1

POLYPHASE ELECTRICAL CONVERTER EQUIPMENT COMPRISING A PLURALITY OF GRID-CONTROLLED DEVICES FOR COUPLING HIGHVOLTAGE DIRECT CURRENT TRANSMISSION LINES TO AN ALTERNATING CURRENT POWER SYSTEM, A TRIGGERED BISTABLE CIRCUIT INDIVIDUAL TO EACH DEVICE WHICH IS MOUNTED CLOSELY ADJACENT THE RESPECTIVE DEVICE AND WHICH IS ARRANGED TO RESPOND TO START AND STOP PULSES AND IN RESPONSE THERETO TO TRANSMIT CONTROL PULSES TO THE RESPECTIVE DEVICE HAVING A TIME WIDTH DETERMINED BY THE START AND STOP PULSES AND EQUAL TO THE NOMINAL CONDUCTING TIME OF THE DEVICE IGNORING COMMUTATION TIME, A SOURCE OF LOW-POWER ELECTRICAL CONTROL PULSES ARRANGED TO TRANSMIT START AND STOP TRIGGER PULSES TO SAID TRIGGERED BISTABLE CIRCUITS FOR CONTROLLING THE OPERATION OF SAID TRIGGERED BISTABLE CIRCUITS IN THE REQUIRED TIME CYCLE TO CONTROL THE POWER FLOW BETWEEN ALTERNATING CURRENT AND DIRECT CURRENT SYSTEM, WHICH PULSE SOURCE IS MOUNTED SEPARATELY FROM SAID CONVERTER EQUIPMENT PROPER, AND PROTECTIVE COUPLING MEANS INTERCONNECTING SAID PULSE SOURCE AND SAID INDIVIDUAL TRIGGERED BISTABLE CIRCUITS, EACH SAID INDIVIDUAL TRIGGER CIRCUIT BEING MOUNTED CLOSELY ADJACENT TO ITS RESPECTIVE DEVICE, AT APPROXIMATELY ITS CATHODE POTENTIAL, BOTH BEING INSULATED FOR HIGH VOLTAGE, AND DRAWING ITS NECESSARY AUXILIARY POWER FROM A LOW-VOLTAGE SUPPLY AVAILABLE AT APPROXIMATELY VALVE CATHODE POTENTIAL, WHEREIN THE SOURCE OF LOW POWER PULSES IS SEPARATELY MOUNTED, AND WHEREIN SAID INSULATED COUPLING MEANS COMPRISE TWO CONTROL PULSE CHANNELS ASSOCIATED WITH EACH TRIGGER CIRCUIT, RESPECTIVELY TO DELIVER START AND STOP CONTROL PULSES.