Pressure and heat sensing means for submersible motors

Claim 1

DEVICE FOR ABOVE-GROUND INDICATION OF A PHYSICAL CONDITION PRESENT AT A THREE PHASE SUBMERSIBLE ELECTRIC MOTOR POSITIONED IN A WELL BORE, COMPRISING: A POWER CABLE HAVING THREE WIRES COUPLING THE MOTOR TO AN ABOVEGROUND POWER DISTRIBUTION SYSTEM, A SENSING ELEMENT ASSOCIATED WITH THE MOTOR FOR RESPONDING TO SUCH PHYSICAL CONDITION, A FIRST BUCKING TRANSFORMER ASSOCIATED WITH THE MOTOR AND HAVING PRIMARY AND SECONDARY WINDINGS, SAID PRIMARY WINDING BEING CONNECTED FROM A FIRST OF SAID WIRES TO A SECOND OF SAID WIRES, ONE END OF SAID SECONDARY WINDING BE COUPLED TO SAID FIRST WIRE AND THE OTHER END OF SAID SECONDARY WINDING BEING COUPLED THROUGH SAID SENSING ELEMENT TO SAID SECOND WIRE, SAID SENSING ELEMENT BEING OPERABLE TO VARY THE ELECTRICAL CURRENT IN SAID SECONDARY WINDING IN A PREDETERMINED MANNER UPON VARIATION OF THE PHYSICAL CONDITION SENSED BY SAID SENSING ELEMENT, SAID VARYING ELECTRICAL CURRENT IN SAID SECONDARY WINDING SUPERIMPOSING AN ELECTRICAL SIGNAL CURRENT ON THE ELECTRICAL POWER CURRENT IN SAID FIRST AND SECOND WIRES, A SECOND BUCKING TRANSFORMER LOCATED ABOVE-GROUND AND HAVING PRIMARY AND SECOND WINDINGS EACH COUPLED BETWEEN SAID FIRST AND SECOND WIRES, AND MEANS COUPLED IN SERIES WITH SAID SECONDARY WINDING OF SAID SECOND TRANSFORMER FOR RESPONDING TO SAID SUPERIMPOSED ELECTRICAL SIGNAL CURRENT FOR OPERATION OF A CIRCUIT BREAKING MEANS.