Electrical cable that limits partial discharges

Patent metadata

Field	Value
Publication number	US-12580099-B2
Application number	US-202217749003-A
Country	US
Kind code	B2
Filing date	May 19, 2022
Priority date	May 21, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

An aerospace cable that limits the occurrence of partial discharges includes an elongate electrically conductive element surrounded by a semiconductor layer and an insulation system around the semiconductor layer. This insulation system has an electrically insulating layer surrounding the semiconductor layer. Each layer of the insulation system has a radial thickness (ei . . . ), and in that an equivalent insulation thickness (teq) of this insulation system is greater than or equal to the result of a third-degree polynomial function equation of a minimum pressure and of a maximum temperature at which the cable is intended to be used.

First claim

The invention claimed is:

1 . An aerospace cable that limits the occurrence of partial discharges comprising:
an elongate electrically conductive element; and an insulation system having a plurality of electrically insulating layers surrounding said elongate electrically conductive element, wherein each of the plurality of electrically insulating layers of the insulation system has a radial thickness, and wherein an equivalent insulation thickness (teq) of this insulation system is greater than the result of a polynomial function equation of a minimum pressure and of a maximum temperature at which the cable is intended to be used, and wherein the equivalent insulation thickness t eq and
the respective radial thicknesses satisfy the following relationship:

t
eq

=

∑

Numbers
⁢

of
⁢

layers
⁢

of
⁢

the
⁢

insulation
⁢

system

x
=
1

e
x

ε
rx

[

Math
.

4

]

where e x is the radial thickness of a layer x
and ε rx is the relative dielectric permittivity of the layer x, and
wherein the equivalent insulation thickness t eq , in mm, is such that:

t
eq

≥

∑

n
=
1

4

a
n

·

PDIV

n
-
1

[

Math
.

1

]

with

a
n

=

∑

m
=
1

4

b

n
,
m

·

p
T

n
-
1

[

Math
.

2

]

and

p
T

=

273

,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]

15

273

,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]

15

+
T

[

Math
.

3

]

where p T is the minimum pressure in mbar or hPa
T is the maximum temperature in degrees Celsius and PDIV represents an amplitude of the partial discharge inception voltage, in kV (kVpeak),
under the minimum pressure and maximum temperature conditions, and
wherein coefficients from the equations math 1, math 2, and math 3 are the following:

b n, m
n = 1
n = 2
n = 3
n = 4

Assignees

• Nexans

Inventors

• Hahner Thomas
• Rybski Patrick

Classifications

• H05K9/0098

  for shielding electrical cables · CPC title

• H05K9/009

  comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked · CPC title

• B64D47/00

  Equipment not otherwise provided for · CPC title

• H01B3/445

  from vinylfluorides or other fluoroethylenic compounds · CPC title

• H01B7/29

  Protection against damage caused by extremes of temperature or by flame {(heat dissipation or conduction H01B7/42)} · CPC title