Automatic voltage compensator for three phase

Claim 1

IN A VOLTAGE COMPENSATING CIRCUIT, THE COMBINATION WITH A POLY-PHASE ALTERNATING CURRENT SUPPLY, OF A DUALTRIODE ELECTRIC VALVE FOR EACH PHASE HAVING A PRIMARY WINDING CONNECTED TO THE CATHODES THEREOF AND HAVING A RESISTANCE-CAPACITY NETWORK CONNECTED TO EACH GRID, MEANS COUPLING THE GRID-CATHODE CIRCUITS OF EACH VALVE WITH ITS RESPECTIVE PHASE OF THE ALTERNATING CURRENT SUPPLY AND IN A MANNER WHEREBY EACH VALVE WILL HAVE PUSH-PULL OPERATION SO THAT THE PRIMARY WINDING HAVING CONNECTION WITH EACH VALVE WILL BE CENTER TAPPED PROVIDING TWO SECTIONS, MEANS RECTIFYING THE POLY-PHASE ALTERNATING CURRENT TO PRODUCE A DIRECT CURRENT VOLTAGE WHICH WILL VARY IN MAGNITUDE AS THE VOLTAGES OF THE ALTERNATING CURRENT SUPPLY MAY VARY, A SECOND GROUP OF DUAL-TRIODE ELECTRIC VALVES INCLUDING ONE FOR EACH PHASE, A SECONDARY WINDING INDUCTIVELY ASSOCIATED WITH EACH SAID PRIMARY WINDING AND HAVING CONNECTION WITH THE GRIDS OF A VALVE OF THE SECOND GROUP, MEANS CONNECTING THE RECTIFIER TO THE GRID-CATHODE CIRCUITS OF THE SECOND GROUP OF VALVES INCLUDING A CONDUCTOR HAVING A CENTER-TAPPED RELATION WITH EACH SECONDARY WINDING TO PROVIDE TWO SECTIONS RESPECTIVELY, A PRIMARY WINDING IN EACH PLATE-CATHODE CIRCUIT OF SAID SECOND GROUP OF VALVES AND WHEREIN PHASE-SHIFTED ELECTRIC PULSES AND PRODUCED AS A RESULT OF OPERATION OF THE VALVES, AND A REGULATOR VALVE CAPABLE OF PRODUCING A DIRECT CURRENT VOLTAGE AND WHICH IS ALSO SUPPLIED TO THE GRID-CATHODE CIRCUITS OF THE SECOND GROUP OF VALVES FOR SETTING A VOLTAGE LEVEL IN EXCESS OF WHICH THE VALVES WILL CONDUCT.