Method of mounting cold shrinkable termination on electric power cable and cold shrinkable termination assembly

Patent metadata

Field	Value
Publication number	US-9716373-B2
Application number	US-201414576799-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 19, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

An inventive method of mounting a cold shrinkable termination on an electric power cable has the steps of: providing a support tube having an outer surface coated with a soft material comprising a gel or a sealing compound on a predetermined segment; pre-expanding an insulation body of a cold shrinkable termination on the support tube coated with the soft material; inserting a cable joint of the electric power cable having a portion of a conductive shielding layer and a portion of an inner insulation layer removed, into the support tube; and removing the support tube from the cold shrinkable termination such that the cold shrinkable termination shrinks on the cable joint of the electric power cable, and the soft material is positioned between the cold shrinkable termination and the cable joint.

First claim

What is claimed is:

1. A method of mounting a cold shrinkable termination on an electric power cable, comprising steps of:
providing a support tube having an outer surface coated with a soft material comprising a viscous liquid gel on a predetermined segment, the gel being preformed as a gel sheet or a gel tape and wrapped on the predetermined segment;
pre-expanding an insulation body of the cold shrinkable termination on the support tube;
inserting a cable joint of the electric power cable having a portion of a conductive shielding layer and a portion of an inner insulation layer removed, into the support tube; and
removing the support tube from the cold shrinkable termination such that the cold shrinkable termination shrinks on the cable joint of the electric power cable, and the soft material is positioned between the cold shrinkable termination and the cable joint.

2. The method according to claim 1 , wherein the viscous liquid gel comprises a vinyl double-end terminated silicone oil, a side chain hydrogen-containing silicone oil, and a platinum-vinyl siloxane complex.

3. The method according to claim 1 , wherein the soft material has a hardness less than or equal to 500 g.

4. The method according to claim 1 , wherein the soft material has a hardness of 60 to 150 g.

5. The method according to claim 1 , wherein the soft material has a thickness of less than 3 mm.

6. The method according to claim 1 , wherein the soft material has a thickness of 0.5 to 1.5 mm.

7. The method according to claim 1 , wherein after removing the support tube from the cold shrinkable termination, the soft material is positioned between the cold shrinkable termination and the cable joint at a part of the exposed conductive shielding layer or at any part of the exposed inner insulation layer.

8. The method according to claim 7 , wherein a step formed by an end surface of exposed conductive shielding layer.

9. The method according to claim 1 , wherein after removing the support tube from the cold shrinkable termination, the soft material is positioned between the cold shrinkable termination and the cable joint at a part of the exposed inner insulation layer adjacent to the conductive shielding layer or at any part of the exposed inner insulation layer.

10. The method according to claim 1 , wherein the support tube comprises a straight tube or a variable diameter tube.

11. The method according to claim 1 , wherein the inner insulation layer is made of a rubber or a cross-linked polyethylene.

12. The method according to claim 1 , further comprising a step of providing a metal connection termination, an end of which is inserted into the support tube and electrically connected to an exposed conductor core of the cable joint prior to removal of the support tube.

13. The method according to claim 12 , wherein the metal connection termination is electrically connected to the conductor core of the cable joint by crimping or bolting.

14. The method according to claim 13 , wherein the connection of the metal connection termination to the insulation body of the cold shrinkable termination is sealed.

15. The method according to claim 13 , wherein after removal of the support tube from the cold shrinkable termination, the soft material is positioned on at least a portion of the metal connection termination.

16. A cold shrinkable termination assembly, comprising:
a support tube having an outer surface;
a soft material comprising a viscous liquid gel coated on a predetermined segment of the outer surface, the gel being preformed as a gel sheet or a gel tape and wrapped on the predetermined segment; and
a cold shrinkable termination having an insulation body pre-expanded on the support tube coated with the soft material.

17. The cold shrinkable termination assembly according to claim 16 , wherein the viscous liquid gel comprises a vinyl double-end terminated silicone oil, a side chain hydrogen-containing silicone oil, and a platinum-vinyl siloxane complex.

18. The cold shrinkable termination assembly according to claim 16 , wherein the gel has a hardness of less than or equal to 500 g, preferably in a range of 60 to 150 g.

19. The cold shrinkable termination assembly according to claim 16 , wherein the gel has a hardness of 60 to 150 g.

20. The cold shrinkable termination assembly according to claim 16 , wherein the cold shrinkable termination is mounted on a cable joint of an electric power cable.

21. The cold shrinkable termination assembly according to claim 20 , further comprising:
a metal connection termination, an end of which is inserted into the support tube and electrically connected to an exposed conductor core of the cable joint of the electric power cable.

22. The cold shrinkable termination assembly according to claim 21 , wherein after removal of the support tube from the cold shrinkable termination, the soft material is coated on at least a portion of the metal connection termination.

23. The cold shrinkable termination assembly according to claim 16 , wherein upon removal of the support tube from the cold shrinkable termination, the soft material is positioned between the cold shrinkable termination and the cable joint at at least one of following locations of:
(1) a part of the exposed conductive shielding layer and all of the exposed inner insulation layer;
(2) a part of the exposed conductive shielding layer, a part of the exposed inner insulation layer, and a step formed by an end surface of exposed conductive shielding layer; or
(3) a part of the exposed inner insulation layer adjacent to the conductive shielding layer or all the exposed inner insulation layer;
or a combination thereof.

24. The cold shrinkable termination assembly according to claim 16 , wherein the support tube comprises a straight tube or a variable diameter tube.

25. The cold shrinkable termination assembly according to claim 16 , wherein the cold shrinkable termination further comprises a stress control cone integrally formed with the insulation body and positioned therein.

Assignees

• Tyco Electronics Shanghai Co Ltd
• Tyco Electronics Shanghai Co Ltd

Inventors

• Li Yugang
• Yang Haowei
• Li Peng

Classifications

• Y10T29/49178

  by shrinking of cover · CPC title

• H02G15/1833

  formed of helically wound strip with adjacent windings, which are removable by applying a pulling force to a strip end · CPC title

• H02G1/14 Primary

  for joining or terminating cables · CPC title

• H02G15/068

  connected to the cable shield only (H02G15/072 takes precedence) · CPC title

• H01B3/20

  liquids, e.g. oils (silicone oils H01B3/46) · CPC title