Terminations for electrical cables and methods for manufacturing such terminations

Patent metadata

Field	Value
Publication number	US-9748722-B2
Application number	US-201114115756-A
Country	US
Kind code	B2
Filing date	May 19, 2011
Priority date	May 19, 2011
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A termination for electrical cables may include: an outer insulation tubular body having a longitudinal axis; a conductive rod within the body; an elastomeric sleeve within the body and extending about an end portion of the rod; a connecting device within the sleeve, wherein the device is mechanically and electrically connected to the rod and is configured to mechanically and electrically connect to an electrical cable; a conductive tubular element within the body, configured to electrically connect to ground; a semi-conductive element within the tubular element and partially extending inside the sleeve on an opposite side to the rod with respect to the device; and at least one elastic conductive element radially interposed between, and in contact with, the tubular element and semi-conductive element, the at least one elastic conductive element configured to exert elastic force onto the semi-conductive element along at least one radial direction toward the axis.

First claim

The invention claimed is:

1. A termination for electrical cables, the termination comprising:
an outer insulation tubular body having a longitudinal axis;
a conductive rod coaxially arranged within the insulation tubular body;
an elastorneric sleeve coaxially arranged within the insulation tubular body and extending about an end portion of the conductive rod;
a connecting device coaxially arranged within the elastomeric sleeve, wherein the connecting device is mechanically and electrically connected to the conductive rod and is configured to mechanically and electrically connect to an electrical cable;
a conductive tubular element coaxially arranged within the insulation tubular body and configured to electrically connect to ground;
a semi-conductive element coaxially arranged within the conductive tubular element and partially extending inside the elastomeric sleeve on an opposite side to the conductive rod with respect to the connecting device; and
at least one elastic conductive element radially interposed between, and in contact with, the conductive tubular element and the semi-conductive element, the at least one elastic conductive element arranged out of the semi-conductive element and having a radially inner surface contacting the semi-conductive element and a radially outer surface contacting the conductive tubular element, the at least one elastic conductive element configured to exert an elastic force onto the semi-conductive element along at least one radial direction toward the longitudinal axis, the semi-conductive element being displaced with respect to the longitudinal axis, depending on an actual diameter of the electrical cable, under the elastic force exerted by the at least one elastic conductive element.

2. The termination of claim 1 , further comprising:
a leak-tight element axially interposed between the elastomeric sleeve and the conductive tubular element.

3. The termination of claim 1 , further comprising:
at least two elastic conductive elements arranged at different axial positions.

4. The termination of claim 1 , wherein the at least one elastic conductive element comprises at least one annular spring coaxially arranged within the conductive tubular element in a radially outer position with respect to the semi-conductive element.

5. The termination of claim 4 , wherein the at least one annular spring comprises a metallic wire spirally wound along an annular path extending about the longitudinal axis to define a plurality of coils.

6. The termination of claim 5 , wherein each of the plurality of coils lays on a plane that does not include the longitudinal axis.

7. The termination of claim 1 , wherein the insulation tubular body is at least partially filled at least with silicone gel.

8. The termination of claim 1 , wherein the connecting device comprises:
a first seat for a plug-in connection to the electrical cable; and
an axially opposite seat for a plug-in connection to the conductive rod.

9. The termination of claim 2 , further comprising:
at least two elastic conductive elements arranged at different axial positions.

10. The termination of claim 2 , wherein the at least one elastic conductive element comprises at least one annular spring coaxially arranged within the conductive tubular element in a radially outer position with respect to the semi-conductive element.

11. The termination of claim 3 , wherein each of the at least two elastic conductive elements comprises at least one annular spring coaxially arranged within the conductive tubular element in a radially outer position with respect to the semi-conductive element.

12. The termination of claim 2 , wherein the insulation tubular body is at least partially filled at least with silicone gel.

13. The termination of claim 3 , wherein the insulation tubular body is at least partially filled at least with silicone gel.

14. The termination of claim 4 , wherein the insulation tubular body is at least partially filled at least with silicone gel.

15. The termination of claim 2 , wherein the connecting device comprises:
a first seat for a plug-in connection to the electrical cable; and
an axially opposite seat for a plug-in connection to the conductive rod.

16. The termination of claim 3 , wherein the connecting device comprises:
a first seat for a plug-in connection to the electrical cable; and
an axially opposite seat for a plug-in connection to the conductive rod.

17. The termination of claim 1 , wherein the at least one elastic conductive element is configured to exert the elastic force radially inwardly directed onto the semi-conductive element along the at least one radial direction toward the longitudinal axis.

18. The termination of claim 1 , wherein the semi-conductive element is displaced radially inwardly with respect to the longitudinal axis, depending on the actual diameter of the electrical cable, under the elastic force exerted by the at least one elastic conductive element.

19. A termination for electrical cables, the termination comprising:
an outer insulation tubular body having a longitudinal axis;
a conductive rod coaxially arranged within the insulation tubular body;
an elastomeric sleeve coaxially arranged within the insulation tubular body and extending about an end portion of the conductive rod;
a connecting device coaxially arranged within the elastomeric sleeve, wherein the connecting device is mechanically and electrically connected to the conductive rod and is configured to mechanically and electrically connect to an electrical cable;
a conductive tubular element coaxially arranged within the insulation tubular body and configured to electrically connect to ground;
a semi-conductive element coaxially arranged within the conductive tubular element and partially extending inside the elastomeric sleeve on an opposite side to the conductive rod with respect to the connecting device; and
at least one elastic conductive element radially interposed between, and in contact with, the conductive tubular element and the semi-conductive element, the at least one elastic conductive element arranged out of the semi-conductive element and having a radially inner surface contacting the semi-conductive element and a radially outer surface contacting the conductive tubular element, the at least one elastic conductive element configured to exert an elastic force radially inwardly directed onto the semi-conductive element along at least one radial direction toward the longitudinal axis, the semi-conductive element being radially inwardly displaced with respect to the longitudinal axis, depending on an actual diameter of the electrical cable, under the elastic force exerted by the at least one elastic conductive element.

20. The termination of claim 19 , further comprising:
a leak-tight element axially interposed between the elastomeric sleeve and the conductive tubular element.

Assignees

• Quaggia Dario
• Prysmian Spa

Inventors

• Quaggia Dario

Classifications

• H02G15/064

  with devices for relieving electrical stress · CPC title

• H02G15/10

  protected by boxes, e.g. by distribution, connection or junction boxes · CPC title

• H02G15/068

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

• H02G15/103

  with devices for relieving electrical stress · CPC title

• H01R43/20 Primary

  for assembling or disassembling contact members with insulating base, case or sleeve · CPC title