Apparatus for molding stress control cones insitu on the terminations of insulated high voltage power cables

Apparatus for molding, at its place of use on the termination of an insulated high voltage power cable, a tapered-surface stress control cone having a semi-conducting shield on one of its tapered surfaces, wherein the molding is made from a stress-control blank or preform provided on said cable, said preform approximating the shape of said resulting stress control cone, said apparatus comprising:

• a split cylindrical enclosure having end flanges, and being of such length that it is adapted to surround said preform and at least portions of said cable that extend beyond opposite ends of the tapered surfaces of said perform,
• means to heat said enclosure,
• a pair of slidable split complementary molding members within said enclosure and being adapted to surround said portions of said insulated cable within said enclosure, said molding members having inner confronting tapered faces extending from the surface of said cable to the inner surface of said enclosure for molding said preform to its final shape upon the application of heat and pressure,
• a pair of pressurizer end plates fitting within said cylindrical enclosure and spaced from one another along the length of the enclosure and beyond the outer faces of said mold members, said end plates having central openings through which said insulated cable passes and being adapted to transmit forces by sliding movement to said molding members during the molding of said stress control cone,
• means to apply forces on said end plates for transmittal to said molding members, and
• means to provide a fluid under pressure within said enclosure during the cooling of said molded stress control cone to prevent the formation of voids therein.