Polyphase current measuring device using several signal detectors each positioned to respond to only one phase current magnetic field

Claim 1

CURRENT MEASURING APPARATUS FOR A HIGH VOLTAGE THREE PHASE TRANSMISSION LINE HAVING FIRST, SECOND AND THIRD SUBSTANTIALLY PARALLEL CONDUCTORS DISPOSED IN A TRIANGULAR PATTERN COMPRISING, IN COMBINATION, A FIRST PICKUP COIL MOUNTED BETWEEN THE FIRST AND SECOND CONDUCTORS AND HAVING THE AXIS OF THE COIL DISPOSED IN THE PLANE OF THE FIRST AND SECOND CONDUCTORS AND SUBSTANTIALLY PERPENDICULAR TO SAID FIRST AND SECOND CONDUCTORS, A SECOND PICKUP COIL MOUNTED BETWEEN THE SECOND AND THIRD CONDUCTORS AND HAVING THE AXIS THEREOF DISPOSED IN THE PLANE OF THE SECOND AND THIRD CONDUCTORS AND SUBSTANTIALLY PERPENDICULAR TO SAID SECOND AND THIRD CONDUCTORS, A THIRD PICKUP COIL DISPOSED BETWEEN THE FIRST AND THIRD CONDUCTORS, THE THIRD PICKUP COIL HAVING THE AXIS THEREOF LYING IN THE PLANE OF THE FIRST AND THIRD CONDUCTORS AND THE SUBSTANTIALLY PERPENDICULAR TO THE FIRST AND THIRD CONDUCTORS, AND FIRST, SECOND AND THIRD CURRENT MEASURING UTILIZATION MEANS ELECTRICALLY CONNECTED TO THE FIRST, SECOND AND THIRD PICKUP COILS AND HAVING THE SIGNALS INDUCED IN THE FIRST, SECOND AND THIRD PICKUP COILS APPLIED THERETO RESPECTIVELY, THE SIGNALS IN THE FIRST, SECOND AND THIRD PICKUP COILS VARYING IN AMPLITUDE WITH VARIATIONS IN THE CURRENTS IN THE THIRD, FIRST AND SECOND CONDUCTORS RESPECTIVELY.