Fast response relay for firing ignitrons employing a phase shifter for controlling the relay

Claim 1

IN A POWER CIRCUIT INCLUDING A SOURCE OF POLYPHASE ALTERNATING CURRENT, AN INDUCTIVE DEVICE HAVING A SECONDARY WINDING AND HAVING PRIMARY WINDINGS CORRESPONDING IN NUMBER TO THE PHASES OF THE ALTERNATING CURRENT SOURCE, MEANS CONNECTING EACH PRIMARY WINDING TO ITS RESPECTIVE PHASE OF SAID SOURCE, A PAIR OF ELECTRIC DISCHARGE VALVES CONNECTED IN CIRCUIT WITH EACH WINDING AND IN BACK-TO-BACK RELATION, WHEREBY ONE GROUP OF VALVES PASSES UNINDIRECTIONAL CURRENT IMPULSES IN ONE DIRECTION AND THE OTHER GROUP PASSES UNIDIRECTIONAL CURRENT IMPULSES IN THE OPPOSITE DIRECTION, A CONTACTOR FOR EACH PAIR OF VALVES HAVING CONNECTION WITH THE CONTROL ELECTRODE OF SAID VALVES, A RELAY FOR EACH CONTACTOR FOR ACTUATING THE SAME TO CLOSE THE CIRCUIT TO THE ELECTRODES WHEN THE RELAY IS ENERGIZED, MEANS FOR ENERGIZING EACH RELAY INCLUDING A PERIODIC VOLTAGE WHICH IS PRODUCED BY THE PHASE CORRESPONDING TO THE RESPECTIVE RELAY, ADDITIONAL MEANS ACTING ON THE PHASES OF THE ALTERNATING CURRENT SOURCE FOR PHASE SHIFTING THE PERIODIC VOLTAGES, WHEREBY THE POINT OF FIRING OF