POWER CABLE TERMINAL CONNECTION DEVICE

• US 20160134094A1
• Filed: 06/19/2014
• Published: 05/12/2016
• Est. Priority Date: 06/26/2013
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Sebesta, Christopher D., Benson, Michael D., Wentzel, Carl J., Loyd, Jaylon D., Mahoney, David V., Biyikli, Levent, Weichold, Jens, Gravermann, Mark, Bolcato, Giuliano
• Granted Patent: US 9,742,180 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01B 9/006 Constructional features relating to the conductors
• CPC Class Codes: H02G 1/14 for joining or terminating cables
• CPC Class Codes: H02G 15/02 Cable terminations for gas- or oil-filled cables H02G15/22
• CPC Class Codes: H02G 15/068 connected to the cable shield only H02G15/072 takes precedence

Abstract

A terminal connection device comprises a contiguous body disposed onto an inner conductor. The inner conductor includes a first end mateable with a power cable connector and a second end. The body comprises a multilayer structure having an inner conductive or semiconductive layer disposed over at least a portion of the power cable connector, an insulating layer and an outer conductive or semiconductive layer. The body surrounds the first end of the inner conductor and extending towards the second end of the inner conductor. The body can also include an electrically isolated section of conductive or semiconductive material. The terminal connection device can be a fully integrated structure, having a pre-installed connection interface, or the terminal connection device can be configured as an adapter which can be mounted in the field to a connection interface.

Claims

1. A terminal connection device for a power cable comprising:

an inner conductor;

a contiguous body disposed onto the inner conductor and comprising;

an insulating layer surrounding the inner conductor and extending beyond a first end of the inner conductor to form a hollow interior section adjacent to the end of the inner conductor;

an outer conductive or semiconductive layer adjacent to and surrounding the insulating layer; and

an electrically isolated section of conductive or semiconductive material in contact with an outer surface of the insulating layer,

wherein the terminal connection device is configured to receive an end of a cable conductor of the power cable such that the end of cable conductor of the power cable fits within the hollow interior section and electrically connects to the first end of the inner conductor;

wherein the electrically isolated section of conductive or semiconductive material forms an electrode of a sensing capacitor of a capacitive voltage sensor;

and wherein the insulating layer is operable to form a dielectric of the sensing capacitor of the capacitive voltage sensor.

2. The terminal connection device of claim 1, further comprising an inner conductive or semiconductive layer between the inner conductor and the insulating layer, the inner conductive or semiconductive layer being adjacent to the insulating layer and the inner conductor;

wherein the inner conductive or semiconductive layer is an overmolded inner conductive or semiconductive layer overmolded on the inner conductor, and

wherein the insulating layer is an overmolded insulating layer overmolded on the inner conductive or semiconductive layer.

4. The terminal connection device of claim 2, wherein the outer conductive or semiconductive layer is an overmolded outer conductive or semiconductive layer overmolded on the insulating layer.

5. The terminal connection device of claim 1, wherein the insulating layer has a substantially consistent thickness.

7. The terminal connection device of claim 1, wherein the inner conductor comprises one of a solid inner conductor and a stranded wire inner conductor.

10. The terminal connection device of claim 1, wherein the outer conductive or semiconductive layer is discontinuous at two longitudinal positions to form the electrically isolated section of conductive or semiconductive material in an annular ring configuration.

11. The terminal connection device of claim 1, further comprising a non-conductive material located between the electrically isolated section of conductive or semiconductive material and the remainder of the outer conductive or semiconductive layer.

15. The terminal connection device of claim 1, wherein the capacitive voltage sensor comprises a conductive element in electrical contact with the electrically isolated section of conductive or semiconductive material to facilitate measuring a voltage potential of the electrically isolated section of conductive or semiconductive material.

17. The terminal connection device of claim 1, further comprising a current sensor configured to measure an electrical current within the cable conductor or the inner conductor.

19. The terminal connection device of claim 1,

wherein the terminal connection device further comprises one of a lug and a connection interface integral with a second end of the inner conductor.

22. The terminal connection device of claim 1, wherein the insulating layer is formed as at least part of a shrinkable sleeve that forms the hollow interior section, wherein the shrinkable sleeve is radially contractible to positively engage the end of the cable conductor of the power cable within the hollow interior section.

44. An assembly comprising:

a power cable including;

a cable conductor extending along a length of the power cable,

a cable insulating layer surrounding the cable conductor except a portion of the cable conductor that protrudes from the cable insulating layer at an end portion of the power cable,

an inner cable semiconductor or conductor layer between the cable conductor and the cable insulating layer, the inner cable semiconductor or conductor layer being adjacent to the cable insulating layer, and

an outer cable semiconductor or conductor layer adjacent to and surrounding the cable insulating layer; and

the terminal connection device of claim 1, wherein the terminal connection device is secured to the end portion of the power cable.

45. The assembly of claim 44, wherein the second end of the inner conductor is integral with a connection interface selected from one of the set consisting of:

a loadbreak elbow connector;

a T connector;

a straight plug;

a straight plug receptacle;

a multi-way junction;

a loadbreak reducing tap plug elbow;

an injection port elbow;

a feed-thru parking bushing;

a feed-thru bushing insert;

a deadbreak reducing plug elbow;

a connecting plug elbow;

a connecting plug;

a cable adapter; and

a bushing insert.

50. A method for installing a terminal connection device with a capacitor on a power cable to facilitate voltage sensing, the method comprising:

attaching a power cable connector onto an end of the power cable, and

mating a terminal connection device including the capacitor to the power cable connector on the end of the power cable, wherein the terminal connection device comprises the terminal connection device of claim 1.

51. A method for retrofitting a power cable, the method comprising:

disconnecting a cable accessory from the power cable; and

mating a terminal connection device including the capacitor to an end of the cable, wherein the terminal connection device comprises the terminal connection device of claim 1.

3. (canceled)

6. (canceled)

8-9. -9. (canceled)

12-14. -14. (canceled)

16. (canceled)

18. (canceled)

20-21. -21. (canceled)

23. An adapter for a medium or high voltage power cable connection, comprising:

an inner conductor having a first end and a second end;

a contiguous body disposed onto the inner conductor and comprising;

an insulating layer surrounding the inner conductor and extending beyond the first end of the inner conductor to form a hollow interior section adjacent to the first end of the inner conductor;

an outer conductive or semiconductive layer adjacent to and surrounding the insulating layer; and

an electrically isolated section of conductive or semiconductive material in contact with an outer surface of the insulating layer,

wherein the adapter is configured to receive an end of a cable conductor of a power cable such that the end of the cable conductor of the power cable fits within the hollow interior section and electrically connects to the first end of the inner conductor, and

wherein the second end of the inner conductor extends beyond the insulating layer and the outer conductive or semiconductive layer, wherein the second end of the inner conductor opposes the first end of the inner conductor, and wherein the second end of the inner conductor is mateable with a connection interface.

24. The adapter of claim 23, further comprising an inner conductive or semiconductive layer between the inner conductor and the insulating layer, the inner conductive or semiconductive layer being adjacent to the insulating layer and the inner conductor;

wherein the inner conductive or semiconductive layer comprises an overmolded inner conductive or semiconductive layer overmolded on the inner conductor, and

wherein the insulating layer comprises an overmolded insulating layer overmolded on the inner conductive or semiconductive layer.

31. The adapter of claim 23, wherein the adapter is configured to receive the end of the cable conductor of the power cable when the end of the cable conductor of the power cable is engaged with an power cable connector, wherein the power cable connector is configured to received in the hollow interior section formed by the insulating layer.

48. A method for retrofitting a power cable, the method comprising:

disconnecting a cable accessory from the power cable;

mating a first end of an adapter of claim 23 to an end of the power cable; and

mating a second end of the adapter to a connection interface.

25-30. -30. (canceled)

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52. (canceled)