Method and means for dissipating heat in a high voltage termination

Claim 1

In a graded capacitor type high voltage cable termination which includes, in combination, the prepared end of a high voltage cable having an axial conductor, an outer annular insulator disposed coaxially over said prepared end of said cable and defining a space therebetween, and a plurality of annular capacitor elements disposed over said prepared end of said cable in stacked relation within said space so that regions of substantially parallel equipotential planes are established between said stacked capacitors; the improvement comprising thermally conductive means interposed between at least two adjacent ones of said stacked capacitors and having thermal communication with the area inwardly of said capacitors, said thermally conductive means being substantially parallel to said parallel equipotential planes and having an inner opening defined by an inner peripheral edge surface of said conductive means, said conductive means having a configuration such that said inner peripheral edge surface lies wholly within the region between said adjacent capacitors in which the equipotential planes are substantially parallel.

Claim 14

A method of dissipating heat from an electrical high-voltage cable termination which includes, in combination, a prepared end of a high voltage electric cable having an axial conductor, an insulation layer immediately overlying said cable in coaxial relation thereon, and an outer conductive sheath layer coaxial along said insulation layer; said sheath and insulation layers being stripped back so as to expose predetermined lengths of said axial conductor and said insulation layer, a stack of annular capacitors disposed coaxially along said cable juxtaposed to said exposed axial conductor and said insulation layer so as to distribute electric stress along the length of said insulation layer and establish regions of substantially parallel equipotential planes between said stacked capacitors, and an annular insulator disposed coaxially over said stack of capacitors, said method comprising inserting an annular thermally conductive disc between each pair of said stacked capacitors within the region of substantially parallel equipotential planes between each pair of said stacked capacitors so that each of said discs has thermal communication with the area inwardly of said annular capacitors and is adapted to transfer heat generated by said axial conductor internally of said stacked capacitors to the area outwardly of said capacitors, said conductive discs being positioned to lie wholly within said regions of substantially parallel equipotential planes.

Claim 15

A method of dissipating heat from an electrical high-voltage cable termination which includes, in combination, a prepared end of a high voltage electric cable having an axial conductor, an insulation layer immediately overlying said cable in coaxial relation thereon, and an outer conductive sheath layer coaxial along said insulation layer; said sheath and insulation layers being stripped back so as to expose predetermined lengths of said axial conductor and said insulation layer, a stack of annular capacitors disposed coaxially along said cable juxtaposed to said exposed axial conductor and said insulation layer so as to distribute electric stress along the length of said insulation layer and establish regions of substantially parallel equipotential planes between said stacked capacitors, and an annular insulator disposed coaxially over said stack of capacitors, said method comprising inserting an annular thermally conductive disc between each pair of said stacked capacitors within the region of substantially parallel equipotential planes between each pair of said stacked capacitors so that each of said discs has thermal communication with the area inwardly of said annular capacitors and is adapted to transfer heat generated by said axial conductor internally of said stacked capacitors to the area outwardly of said capacitors, said conductive discs being positioned to lie wholly within said regions of substantially parallel equipotential planes.