System for dynamically cooling a high voltage cable termination

Claim 2

A dynamic cable termination cooling system comprising a pothead having an outer insulator, a hollow cable conductor extending along the pothead axis, and insulation disposed about said cable conductor and within said outer insulator, a tube disposed within said hollow conductor defining an annular space between the tube and said conductor, said annular space forming a first flow passage and the interior of said tube forming a second flow passage, a port in said tube communicating between said first and second flow passages at one end thereof, and means coupled to said annular space and to said tube at the other respective ends of said flow passages defining a loop for the circulation of a coolant liquid through said first and second passages, the portion of said loop within said pothead being confined substantially to the interior of said hollow cable conductor, and said means including a pump and heat transfer means for cooling saId liquid.

Claim 3

A dynamic cable termination cooling system comprising a pothead having an outer insulator, a hollow cable conductor extending along the pothead axis, and insulation disposed about said cable conductor and within said outer insulator, a tube disposed within said hollow conductor defining an annular space between the tube and said conductor, said annular space forming a first flow passage and the interior of said tube forming a second flow passage, a port in said tube communicating between said first and second flow passages at one end thereof, and means coupled to said annular space and to said tube at the other respective ends of said flow passages defining a loop for the circulation of a coolant liquid through said first and second passages, the portion of said loop within said pothead being confined substantially to the interior of said hollow cable conductor, and said means including a pump and heat transfer means for cooling saId liquid.

Claim 4

A dynamic cable termination cooling system comprising a pothead having an outer insulator, a hollow cable conductor extending along the pothead axis, and insulation disposed about said cable conductor and within said outer insulator, a tube disposed within said hollow conductor defining an annular space between the tube and said conductor, said annular space forming a first flow passage and the interior of said tube forming a second flow passage, a port in said tube communicating between said first and second flow passages at one end thereof, and means coupled to said annular space and to said tube at the other respective ends of said flow passages defining a loop for the circulation of a coolant liquid through said first and second passages, the portion of said loop within said pothead being confined substantially to the interior of said hollow cable conductor, and said means including a pump and heat transfer means for cooling saId liquid.

Claim 5

The system of claim 1 wherein said heat transfer means comprises a coiled tube coupled between said first and second flow passages, and said coiled tube is disposed at the normally high voltage end of said pothead.

Claim 6

The system of claim 2 wherein said coiled tube is in direct heat transfer relation to the ambient air.

Claim 7

The system of claim 1 wherein said pump coupled in said loop is disposed at the normally high voltage end of said pothead.

Claim 8

The system of claim 4 comprising an electric driving motor coupled to said pump, and means for deriving electrical energy from said conductor for energizing said motor.

Claim 9

The system of claim 5 wherein the pothead includes terminal means located at the normally high voltage end thereof and extending externally therefrom, said terminal means being electrically connected to said conductor, and said means for deriving electrical energy comprises a current transformer coupled to said terminal means.

Claim 10

The system of claim 6 wherein said terminal means comprises a cylindrical connector member axially disposed at the normally high voltage end of said pothead, and said current transformer includes an annular coil concentrically disposed about said connector member.

Claim 11

The system of claim 1 wherein said pothead includes a metal body portion at the normally grounded end thereof, and said first and second flow passages extend to a predetermined point along the hollow conductor within said body portion.

Claim 12

The system of claim 8 wherein further means are provided for cooling the portion of the hollow conductor within said pothead body portion located beyond said predetermined point, said further means being independent of said loop.

Claim 13

The system of claim 8 for use with an oil filled pipe cable system, said system comprising means for conducting the pipe oil through said pothead body portion.

Claim 14

The system of claim 10 wherein stress relief insulation is provided about said conductor within said body portion, and an oil baffle is disposed about said stress relief insulation and at least coextensive therewith along the axis of the pothead within said body portion

Claim 15

The system of claim 11 wherein said insulation is impregnated with an insulating liquid dielectric of the pothead, said system comprising a valve and filter coupled to a port in said baffle for communication between the pothead liquid dielectric and the pipe oil.

Claim 16

A dynamically cooled pothead for use with a hollow core cable, the cable conductor extending along the pothead axis, said pothead comprising an outer insulator, insulation disposed about said cable conductor and within said outer insulator, a tube disposed within the conductor core defining an annular space between the tube and said conductor, said annular space forming a first flow passage and the interior of said tube forming a second flow passage, a port in said tube communicating between said first and second flow passages at one end thereof, and means coupled to said annular space and to said tube at the other respective ends of said flow passages for circulating an insulating liquid dielectric through a loop including said first and second flow passages, said means including a pump and heat transfer means for cooling said liquid, said pump and heat transfer means being disposed at the normally high voltage end of the pothead and said heat transfer means being in direct heat transfer relation to the surrounding ambient.

Claim 17

A dynamically cooled pothead for use with a hollow core cable, the cable conductor extending along the pothead axis, said pothead comprising an outer insulator, insulation disposed about said cable conductor and within said outer insulator, a tube disposed within the conductor core defining an annular space between the tube and said conductor, said annular space forming a first flow passage and the interior of said tube forming a second flow passage, a port in said tube communicating between said first and second flow passages at one end thereof, and means coupled to said annular space and to said tube at the other respective ends of said flow passages for circulating an insulating liquid dielectric through a loop including said first and second flow passages, said means including a pump and heat transfer means for cooling said liquid, said pump and heat transfer means being disposed at the normally high voltage end of the pothead and said heat transfer means being in direct heat transfer relation to the surrounding ambient.

Claim 18

The pothead of claim 13 wherein said heat transfer means comprises a coiled tube coupled between said first and second flow passages.

Claim 19

The pothead of claim 14 comprising an electric driving motor coupled to said pump and means for deriving electrical energy from said conductor for energizing said motor.

Claim 20

The pothead of claim 15 wherein in the pothead includes terminal means located at the normally high voltage end thereof and extending externally therefrom, said terminal means being electrically connected to said hollow conductor, And said means for deriving electrical energy comprises a current transformer coupled to said terminal means.

Claim 21

The pothead of claim 16 wherein said means for deriving electrical energy further comprises a control circuit for controlling the application of power to said motor in accordance with a predetermined mode of operation.

Claim 22

The pothead of claim 13 wherein said circulating means includes a filter in said loop for maintaining the dielectric qualities of said insulating liquid.