Power distribution connection apparatus

Claim 1

IN COMBINATION WITH A HIGH VOLTAGE LINE AND AN OIL-FILLED TRANSFORMER UNIT HAVING A TAP CABLE OPENING AND FILLED WITH OIL TO A SELECTED LEVEL, A TAP CABLE UNIT, WHICH COMPRISES, (A) A SHEATHED CABLE HAVING AN INNER CONDUCTOR ENCLOSED IN A SOLID INSULATION INSOLUBLE IN THE OIL OF SAID TRANSFORMER UNIT COVERED BY A SEMI-CONDUCTIVE TAPE AND AN OUTER CONDUCTING SHEATH ADAPTED AND DESIGNED TO BE CONNECTED TO GROUND, SAID CABLE HAVING THE ENDS PENCILLED TO BARE THE CONDUCTOR AND HAVING THE SHEATH AND TAPE STRIPPED FROM THE BARED ENDS FOR A SELECTED LENGTH, SAID SHEATH BEING STRIPPED SLIGHTLY FURTHER THAN SAID TAPE AT END OF THE CABLE TO ESTABLISH PARTIAL RESISTIVE POTENTIAL GRADING AT THE ENDS OF THE SHEATH, ONE END OF THE SHEATH BEING BELLED TO FORM A CONE AND EXTENDING DOWNWARDLY THROUGH THE CABLE OPENING IN THE TRANSFORMER UNIT, (B) A LINE TERMINATION UNIT SECURED TO THE END OF THE CABLE OPPOSITE THE BELLED END AND INCLUDING, (1) A SINGLE-PIECE TUBULAR PORCELAIN SHROUD COAXIALLY MOUNTED ABOUT A BARED END OF THE CABLE IN AXIALLY SPACED RELATION TO THE ADJACENT END OF THE SHEATH, (2) A TERMINAL IN THE END OF THE SHROUD CONNECTED TO THE BARED CONDUCTOR AND TO THE HIGH VOLTAGE LINE, (3) A GRADING CONE HAVING A NARROW TUBULAR NECK TELESCOPED OVER THE OUTER END OF THE SHEATH IN FIRM ELECTRICAL ENGAGEMENT THEREWITH AND PROJECTING AXIALLY AND RADIALLY THEREFROM INTO ENGAGEMENT WITH THE ADJACENT PORTION OF THE SHROUD, (4) A HIGH DIELECTRIC CONSTANT EPOXY RESIN COMPLETELY FILLING THE SPACE BETWEEN THE CABLE AND SAID SHROUD AND CONE, (C) MEANS CONNECTED TO SAID TRANSFORMER UNIT AND CABLE AND SUPPORTING THE BELLED END OF THE CABLE WITH THE GRADING CONE BELOW THE COLD OIL LEVEL OF THE OIL IN THE TRANSFORMER UNIT AND TO SEAL THE CABLE OPENING, (D) MEANS ELECTRICALLY CONNECTING THE INNER CONDUCTOR TO THE TRANSFORMER UNIT AND CONSTRUCTED AND ARRANGED TO HAVE A SELECTED FLASHOVER VOLTAGE, AND (E) SAID LINE TERMINATION UNIT BEING CONSTRUCTED AND ARRANGED TO HAVE A FLASHOVER VOLTAGE BELOW SAID SELECTED FLASHOVER VOLTAGE.