Electrical cable for the aerospace field

Patent metadata

Field	Value
Publication number	US-12412679-B2
Application number	US-202117466587-A
Country	US
Kind code	B2
Filing date	Sep 3, 2021
Priority date	Sep 4, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

An insulated electrically conductive element ( 1 ) for the aerospace field has an elongate electrically conductive element surrounded by at least two layers, said two layers being an electrically insulating layer ( 4 ) surrounding the elongate electrically conductive element ( 2 ) and a first semiconductor layer ( 5 ) surrounding said electrically insulating layer ( 4 ), at least one of the layers having at least one fluoropolymer.

First claim

The invention claimed is:

1. An insulated electrically conductive element for the aerospace field, comprising:
an elongate electrically conductive element surrounded by at least three layers, said three layers being an electrically insulating layer surrounding the elongate electrically conductive element;
a first semiconductor layer of a thickness e 1 surrounding said electrically insulating layer; and
a second semiconductor layer of a thickness e 2 surrounding said electrically conductive element, at least one of said three layers comprising at least one fluoropolymer,
wherein said electrically insulating layer has a thickness e i , the value of said thickness e i being determined according to the operating voltage U of the insulated electrically conductive element, the value of the electric field e max , and an inner diameter d1 of the electrically insulating layer,
wherein the thickness e i of the insulating layer is determined according to a ratio of the operating voltage U to the diameter d1, such that the thickness e i simultaneously satisfies the following relationship:

ei
≥

d
1

2

[

exp
⁡
(

U

E
max

×

d
1

2

)

-
1

]

and
the thickness ei≥e1+e2.

2. The element according to claim 1 , wherein at least two of the three layers surrounding the electrically conductive element comprise at least one fluoropolymer.

3. The element according to claim 1 , wherein each of the three layers comprises at least one fluoropolymer, preferably the same fluoropolymer.

4. The element according to claim 1 , wherein the fluoropolymer is chosen from polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP) copolymers, perfluoroalkoxy alkane (PFA) copolymers, perfluoromethoxy alkane (MFA) copolymers, ethylene tetrafluoroethylene (ETFE), and one of the mixtures thereof.

5. The element according to claim 1 , wherein the fluoropolymer is chosen from perfluoroalkoxy alkane (PFA) copolymers.

6. The element according to claim 1 , wherein each of the three layers comprises at least one perfluoroalkoxy alkane (PFA) copolymer.

7. The element according to claim 1 , wherein said electrically conductive element withstands temperatures ranging from −70° C. to 250° C.

8. The element according to claim 1 , wherein said electrically conductive element withstands an electric field E ranging from 1 kV/mm to 30 kV/mm.

9. The element according to claim 1 , wherein the electrically insulating layer has a thickness e i , the value of said thickness e i being determined according to the operating voltage U of the insulated electrically conductive element and an inner diameter d 1 of the electrically insulating layer.

10. The element according to claim 1 , wherein the minimum value of the thickness e i expressed in millimetres (mm) is determined according to a following relationship R1:

R
⁢
1

=

U

E
max

×

d
1

2

.

11. The element according to claim 1 , wherein the maximum value of the thickness e i is determined according to a following relationship R2:

R
⁢
2

=

3
×
U

E
max

×

d
1

2

.

12. An electrically conductive cable, said electrically conductive cable comprising: at least one insulated electrically conductive element according to claim 1 .

Assignees

• Nexans

Inventors

• Haehner Thomas
• Rybski Patrick
• Charrier Dimitri
• Charmetant Adrien
• Lagomarsini Clara
• Mellouky Nabil
• Paixao Dantas Marcelo

Classifications

• H01B7/2806

  Protection against damage caused by corrosion · CPC title

• H01B7/0258

  comprising one or more longitudinal lapped layers of insulation · CPC title

• H01B3/445

  from vinylfluorides or other fluoroethylenic compounds · CPC title

• H01B7/2813

  Protection against damage caused by electrical, chemical or water tree deterioration · CPC title

• H01B7/0291

  comprising two or more layers of insulation having different electrical properties · CPC title