D. c. watt-hour metering device including a saturable reactor means and a multivibrator

Claim 1

AD.C. WATT-HOUR METERING DEVICE FOR D.C. NETWORKS FED BY A D.C. LINE CONSISTING OF A NEGATIVE WIRE AND A POSITIVE WIRE, COMPRISING A SATURABLE REACTOR HAVING TWO CORES EACH WITH ONE OUTPUT WINDING, SAID SATURABLE CORES SURROUNDING ONE OF THE D.C. WIRE ACTING AS CONTROL WINDINGS, SAID TWO OUTPUT WINDINGS BEING CONNECTED IN SERIES TO ONE ANOTHER AND OPPOSITELY WOUND TO CAUSE SAID REACTOR TO WORK AS A D.C. TRANSFORMER, A SINGLE PHASE INDUCTION WATT-HOUR METER HAVING A CURRENT COIL, A VOLTAGE COIL AND A ROTARY DISC, A COMPENSATING RESISTOR CONNECTED IN SERIES WITH THE CURRENT COIL OF SAID WATT-HOUR METER, AN AUXILIARY INDUCTION MEANS HAVING A MAIN COIL AND A SHADING COIL AND ACTING ON SAID DISC OF SAID WATT-HOUR METER, SAID MAIN COIL BEING CONNECTED IN SERIES WITH THE OUTPUT WINDINGS OF SAID SATURABLE REACTOR AND SAID VOLTAGE COIL OF SAID SINGLE PHASE INDUCTION WATT-HOUR METER, A MAGNETICALLYCOUPLED MULTIVIBRATOR GENERATING SQUARE WAVE VOLTAGE WITH AMPLITUDE PROPORTIONAL TO THE VOLTAGE OF THE D.C. LINE, SAID MAGNETICALLY COUPLED MULTIVIBRATOR INCLUDING TWO TRANSISTORS, A RESISTIVE VOLTAGE DIVIDER CONNECTED ACROSS THE D.C. LINE AND BIASING BASES OF SAID TRANSISTORS AND A TRANSFORMER HAVING A PRIMARY WINDING, A FIRST, A SECOND AND A THIRD SECONDARY WINDING, SAID TWO TRANSISTORS HAVING EMITTERS CONNECTED TO ONE ANOTHER AND TO THE POSITIVE WIRE OF THE D.C. LINE, SAID PRIMARY WINDING HAVING TERMINALS CONNECTED WITH BASES OF SAID TRANSISTORS AND A CENTRAL TAP CONNECTED WITH AN INTERMEDIATE POINT OF SAID RESISTIVE VOLTAGE DIVIDER, SAID FIRST SECONDARY WINDING HAVING TERMINALS CONNECTED WITH COLLECTORS OF SAID TRANSISTORS AND A CENTRAL TAP CONNECTED TO THE NEGATIVE WIRE OF THE D.C. LINE, SAID SECOND SECONDARY WINDING SUPPLYING IN SERIES THE OUTPUT WINDING OF SAID SATURABLE REACTOR AND THE VOLTAGE COIL OF SAID WATT-HOUR METER AND AUXILIARY INDUCTION MEANS, SAID THIRD SECONDARY WINDING SUPPLYING IN SERIES THE CURRENT COIL OF SAID WATT-HOUR METER AND SAID COMPENSATING RESISTOR.