Electrical cable resistant to fire, water and mechanical stresses

Patent metadata

Field	Value
Publication number	US-9330818-B2
Application number	US-201313934682-A
Country	US
Kind code	B2
Filing date	Jul 3, 2013
Priority date	Jul 5, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

An electrical cable includes at least one conductor and a barrier arranged externally to the at least one conductor. The barrier includes two first layers including an inorganic material and a second layer including a polymer-metal composite material, the second layer being interposed between the two first layers. The electrical cable also includes, in an intermediate position between the at least one conductor and the barrier, solely discontinuous layers and/or layers of non-thermally-collapsible materials.

First claim

The invention claimed is:

1. An electrical cable comprising:
at least one conductor;
a barrier arranged externally to said at least one conductor, said barrier comprising two first layers comprising an inorganic material and a second layer comprising a tape of a polymer-metal composite material, said second layer being interposed between said two first layers,
wherein said electrical cable comprises, in an intermediate position between said at least one conductor and said barrier, solely discontinuous layers and/or layers of thermally not collapsible materials.

2. The electrical cable according to claim 1 , wherein the at least one conductor of the electrical cable has an insulating coating comprising at least one discontinuous layer of inorganic material and a layer of ceramifying polymer.

3. The electrical cable according to claim 2 , wherein the insulating coating comprises at least two discontinuous layers of inorganic material.

4. The electrical cable according to claim 3 , wherein said at least two discontinuous layers are provided in a radially internal position with respect to the layer of ceramifying polymer.

5. The electrical cable according to claim 2 , wherein the at least one discontinuous layer is in a form of a tape wound with an overlap equal to or higher than 20%.

6. The electrical cable according to claim 4 , wherein the at least two discontinuous layers are tapes which are wound with opposite winding directions.

7. The electrical cable according to claim 2 , wherein the inorganic material of the at least one discontinuous layer is glass fiber and/or mica.

8. The electrical cable according to claim 2 , wherein the layer of ceramifying polymer is made of a polymer filled with refractory additives.

9. The electrical cable according to claim 2 , wherein the layer of ceramifying polymer comprises silicone rubber.

10. The electrical cable according to claim 1 , wherein the inorganic material of each first layer of the barrier comprises glass fiber and mica.

11. The electrical cable according to claim 1 , wherein the first layers comprise, respectively, a tape which is wound around all conductors with an overlap equal to or higher than 20%.

12. The electrical cable according to claim 1 , wherein the second layer comprises a tape of polyester having a metallic face.

13. The electrical cable according to claim 12 , wherein the metallic face is copper or aluminium.

14. The electrical cable according to claim 12 , wherein the polyester of the second layer of the barrier is polyethylene terephthalate.

15. The electrical cable according to claim 1 , wherein the second layer is a tape which is wound on the radially internal first layer with an overlap equal to or higher than 20%.

Assignees

• Prysmian Spa

Inventors

• Scaglione Antonio
• Soccal Carlo
• Mazzucato Alessandro
• Bucci Riccardo

Classifications

• H01B7/28

  {Protection against damage caused} by moisture, corrosion, chemical attack or weather · CPC title

• H01B7/18 Primary

  Protection against damage caused} by wear, mechanical force or pressure; {Sheaths; Armouring · CPC title

• H01B7/2825

  using a water impermeable sheath · CPC title

• H01B7/295 Primary

  using material resistant to flame · CPC title

• Y02A30/14

  Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables · CPC title