Transformers with leak- and coronafree direct electrical connections

Claim 1

A DISTRIBUTION TRANSFORMER FOR INTERCONNECTION TO A PRIMARY LINE CONDUCTOR COMPRISING A TANK CONTAINING A DIELECTRIC FLUID, A CORE AND COIL UNIT LOCATED WITHIN SAID TANK BELOW THE LEVEL OF SAID FLUID, SAID UNIT INCLUDING A PRIMARY WINDING AND A SECONDARY WINDING, MEANS FOR SECURING SAID UNIT WITHIN SAID TANK, SAID TANK HAVING AT LEAST ONE PRIMARY SQUEEZE FITTING PROVIDING AN ENTRY INTO THE TANK INTERIOR, AT LEAST ONE INSULATED PRIMARY CABLE CONNECTED TO SAID PRIMARY WINDING AND CARRIED DIRECTLY THROUGH SAID SQUEEZE FITTING AND ADAPTED TO BE DIRECTLY CONNECTED TO THE PRIMARY LINE CONDUCTOR EXTERIOR SAID TANK, SAID SQUEEZE FITTING COMPRISING A TUBULAR CONDUCTIVE MEMBER EXTENDING THROUGH THE TANK WALL AND HAVING A CYLINDRIC PASSAGE THERETHROUGH, A RESILIENT GENERALLY CYLINDRICAL INSULATING GROMMET POSITIONED WITHIN SAID FITTING AND HAVING AN OUTER DIAMETER SUBSTANTIALLY EQUAL TO THE INNER DIMENSION OF SAID PASSAGE, AN INSULATING SUBSTANTIALLY NONRESILIENT RETAINER COAXIALLY POSITIONED WITHIN SAID PASSAGE ON THE INNER END OF SAID GROMMET, SAID CABLE INSULATION BEING FORMED OF A THERMOPLASTIC SYNTHETIC RESIN AND THE GROMMET BEING FORMED OF SUBSTANTIALLY INCOMPRESSIBLE THERMOSETTING SYNTHETIC RESIN, SAID GROMMET AND RETAINER HAVING AXIAL PASSAGES THROUGH WHICH SAID PRIMARY CABLE IS CARRIED, SHOULDER MEANS ON THE INNER END OF SAID CYLINDRIC PASSAGE AGAINST WHICH SAID RETAINER BEARS, AND MEANS INCLUDING A CAP THREADABLE ON THE OUTER END OF SAID FITTING FOR MAINTAINING ENDWISE COMPRESSION ON SAID GROMMET, SAID GROMMET BEING PROVIDED WITH RECESSES WHICH ARE SUBSTANTIALLY CLOSED UNDER COMPRESSION BY SAID CAP WHEREBY UPON ANY DEFORMATION OF THE PRIMARY CABLE INSULATION THE GROMMET EXPANDS CORRESPONDINGLY AND DEFORMS RADIALLY INWARDLY TO MAINTAIN A SEAL AROUND SAID CABLE THEREBY EFFECTIVELY SEALING THE INTERIOR OF SAID TANK WHEREBY LEAK- AND CORONA-FREE DIRECT ELECTRICAL CONNECTIONS MAY BE MADE AND MAINTAINED BETWEEN THE PRIMARY WINDING AND THE PRIMARY LINE CONDUCTOR.