Seal Systems for Oil-Filled Cable Terminations and Assemblies and Methods Including the Same

Patent metadata

Field	Value
Publication number	US-2018175603-A1
Application number	US-201715850473-A
Country	US
Kind code	A1
Filing date	Dec 21, 2017
Priority date	Dec 21, 2016
Publication date	Jun 21, 2018
Grant date	—

Abstract

Described herein is a seal system for an oil-filled cable termination including a cable extending through each of a cable gland and a stress cone that is spaced apart from the cable gland. The seal system includes: a first oil seal layer surrounding the cable between the cable gland and the stress cone; a second oil seal layer overlapping and contacting the first oil seal layer; a first oil barrier layer overlapping and contacting an upper portion of the second oil seal layer; a second oil barrier layer overlapping and contacting a lower portion of the second oil seal layer, the second oil barrier layer spaced apart from the first oil barrier layer; and a heat shrinkable tube secured around the first and second oil barrier layers.

First claim

What is claimed is:

1 . An assembly for use with an oil-filled cable termination, the assembly comprising:
a cable gland; a cable received in the cable gland; a stress cone received around the cable and spaced apart from the cable gland; and a seal system around the cable between the cable gland and the stress cone, the seal system comprising:
a first oil seal layer surrounding the cable;
a second oil seal layer overlapping and contacting the first oil seal layer;
a first oil barrier layer overlapping and contacting an upper portion of the second oil seal layer;
a second oil barrier layer overlapping and contacting a lower portion of the second oil seal layer, the second oil barrier layer spaced apart from the first oil barrier layer; and
a heat shrinkable tube secured around the first and second oil barrier layers.

2 . The assembly of claim 1 wherein the first oil seal layer comprises ethylene propylene rubber (EPR) self-amalgamating tape.

3 . The assembly of claim 1 wherein the first oil seal layer overlaps and contacts each of the cable gland and the stress cone.

4 . The assembly of claim 1 wherein the second oil seal layer comprises silicone tape.

5 . The assembly of claim 1 wherein the second oil seal layer is substantially coextensive with the first oil seal layer.

6 . The assembly of claim 1 wherein the first and second oil barrier layers each comprise mastic material.

7 . The assembly of claim 1 wherein:
the first oil barrier layer overlaps and contacts the cable gland; and
the second oil barrier layer overlaps and contacts the stress cone.

8 . The assembly of claim 1 wherein the heat shrinkable tube overlaps and contacts each of the cable gland and the stress cone.

9 . The assembly of claim 1 further comprising:
a semiconductor layer overlapping and contacting the cable between the cable gland and the stress cone; and
a copper mesh layer overlapping and contacting the semiconductor layer, wherein the first oil seal layer overlaps and contacts the copper mesh layer.

10 . The assembly of claim 1 wherein the seal system decreases in diameter from the cable gland to the stress cone.

11 . The assembly of claim 1 wherein:
the first oil seal layer comprises ethylene propylene rubber (EPR) self-amalgamating tape;
the second oil seal layer comprises silicone tape;
the first and second oil barrier layers each comprise mastic material; and
the second oil seal layer, the first and second oil barrier layers and/or the heat shrinkable tube form a barrier such that insulating oil surrounding the heat shrinkable tube does not contact or reach the first oil seal layer.

12 . The assembly of claim 1 further comprising a base plate comprising a seat defining an opening, wherein the cable gland comprises a tubular portion with the cable received therein and a plate portion held on the base plate seat such that the cable and the cable gland extend through the opening.

13 . The assembly of claim 12 further comprising an insulator housing coupled to the base plate and surrounding the cable above the base plate, the cable gland tubular portion above the base plate, and the stress cone.

14 . A method for forming a seal system for an oil-filled cable termination comprising a cable that is received through each of a cable gland and a stress cone that is spaced apart from the cable gland, the method comprising:
forming a first oil seal layer around the cable between the cable gland and the stress cone; forming a second oil seal layer on the first oil seal layer; forming a first oil barrier layer on a lower portion of the second oil seal layer; forming a second oil barrier layer that is spaced apart from the first oil barrier layer on an upper portion of the second oil seal layer; and securing a heat shrinkable tube around the first and second oil barrier layers.

15 . The method of claim 14 wherein:
forming the first oil seal layer comprises wrapping ethylene propylene rubber (EPR) self-amalgamating tape around the cable; and
the first oil seal layer overlaps and engages each of the cable gland and the stress cone.

16 . The method of claim 15 wherein:
forming the second oil seal layer comprises wrapping silicone tape around the first oil seal layer; and
the second oil seal layer is substantially coextensive with the first oil seal layer.

17 . The method of claim 16 wherein:
forming the first and second oil barrier layers comprises applying mastic material on the second oil seal layer;
the first oil barrier layer overlaps and engages the cable gland; and
the second oil barrier layer overlaps and engages the stress cone.

18 . The method of claim 14 wherein:
securing the heat shrinkable tube comprises heating the heat shrinkable tube; and
the heated heat shrinkable tube overlaps and engages each of the cable gland and the stress cone.

19 . The method of claim 14 further comprising:
forming a semiconductor layer by wrapping semiconductor tape around the cable before forming the first oil seal layer; and
forming a copper mesh layer by wrapping copper mesh around the semiconductor layer, wherein the first oil seal layer overlaps and engages the copper mesh layer.

20 . A seal system for an oil-filled cable termination comprising a cable extending through each of a cable gland and a stress cone that is spaced apart from the cable gland, the seal system comprising:
a first oil seal layer surrounding the cable between the cable gland and the stress cone; a second oil seal layer overlapping and contacting the first oil seal layer; a first oil barrier layer overlapping and contacting an upper portion of the second oil seal layer; a second oil barrier layer overlapping and contacting a lower portion of the second oil seal layer, the second oil barrier layer spaced apart from the first oil barrier layer; and a heat shrinkable tube secured around the first and second oil barrier layers.

Assignees

• Te Connectivity Corp

Inventors

• Czibur Alexander R
• Maher Kathryn Marie
• Yaworski Harry George
• Seraj Mahmoud
• Iyer Ganpathy

Classifications

• H02G15/003 Primary

  Filling materials, e.g. solid or fluid insulation · CPC title

• H02G15/23

  Cable-end sealings · CPC title

• H02G15/013 Primary

  Sealing means for cable inlets (inlets for cables filled with, or surrounded by, gas or oil H02G15/32) · CPC title

• H02G15/064

  with devices for relieving electrical stress · CPC title