Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G15/00—Cable fittings
  • H02G15/02—Cable terminations
  • H02G15/06—Cable terminating boxes, frames or other structures
  • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
  • H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
  • H02G1/1204—Hand-held tools
  • H02G1/1236—Features relating to cutting elements
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
  • H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
  • H02G1/1248—Machines
  • H02G1/1265—Machines the cutting element rotating about the wire or cable
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
  • H02G1/1202—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by cutting and withdrawing insulation
  • H02G1/1248—Machines
  • H02G1/127—Features relating to cutting elements
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
  • H02G1/1297—Removing armouring from cables

Definitions

• the present invention relates to a termination of a high or very high voltage electrical transmission cable of a composite end of a high or very high voltage cable, in particular composite ends are arranged in these electrical terminations with a view to their connection with a connector.
• the invention also relates to a process for preparing an end of a high or very high voltage cable.
• the invention finds its application in association with an anti-deflagration terminal arranged outside around this termination of such a high-voltage cable.
• a termination of a cable comprises one end of a cable, this end is coupled to a connector at the interior of a sealed terminal, the sealed terminal forming an anti-deflagration terminal and comprising a cylindrical sleeve, a lower plate and an upper plate, the plates closing off the sleeve respectively at its two opposite ends in order to define a sealed volume able to contain a insulating material.
• the composite end of the cable and the connector define the cable termination.
• the invention applies to the fields of high voltage power cables (in particular above 60 kV, and possibly up to 800 kV), whether direct or alternating current.
• Power cables typically include a central electrical conductor and at least one electrically insulating layer of reticulated or thermoplastic material using techniques well known to those skilled in the art.
• the electrical terminations are generally arranged in explosion-proof terminals erected vertically on the ground, there is a need to improve the tensile strength of the ends of the cables retained in the connectors inside these terminals, including for temperatures of use of more than 100°C, for example of the order of 130°C.
• GIS terminations represent less bulky solutions than conventional air-insulated terminations.
• GIS terminations there is a need to improve the sealing of the termination and the maintenance of the contacts made at the level of the termination.
• GIS-type terminations are an advantageous component of a high-voltage direct current link thanks to the flexibility and volume reduction they provide for cable connections, particularly in confined spaces such as offshore platforms.
• the invention relates to a termination of a high or very high voltage electrical transmission cable of a composite end of a high or very high voltage electrical transmission cable comprising a free end of a cable, the cable comprising an elongated central conducting element, and a plurality of layers arranged successively from the innermost to the outermost, coaxially around this conducting element, this plurality of layers comprising an internal semiconducting layer , an electrically insulating layer, an outer semiconductor layer, such that a part of the layers is stripped from a distal end of the free end of the cable, the outer semiconductor layer being stripped over an axial length greater than the length wherein the electrically insulating layer is stripped, and one end of the outer semiconductor layer forming a bevel.
• the termination of a high or very high voltage electrical transmission cable comprises a deflector cone provided with an annular lip, the lip of the cone being arranged around a bevel so that a free edge of this lip is in support against the bevel.
• the bevel may have a slope of less than 2°.
• the outer semiconductor layer being annular it can be defined by a radial thickness comprised between 1 and 2 mm. More particularly, an edge of the bevel, that in contact with the electrically insulating layer, can be defined in an annular zone of less than 5 mm in axial length along a longitudinal axis of the cable, to improve a contact surface with a annular lip of a deflector cone.
• the outer semiconductor layer may be made of a thermoplastic material, and more particularly still have a hardness below a predetermined threshold, in particular for a shore A hardness of less than 95 and for a shore D hardness of less than 43.
• the invention also relates to a method for preparing one end of a termination of a high or very high voltage electrical transmission cable according to the invention, in which the preparation steps, in particular for the Stripping involves the following steps:
• the electrically insulating layer is stripped with a stripping device so that the outer semiconductor layer is removed over an axial length greater than the length along which the electrically insulating layer is stripped ,
• a glass slide is used to modify a slope of the end of the outer semi-conducting layer in order to form a bevel
• deflector cone (20) provided with an annular lip (22) is attached around this free end so that this lip of the cone (22) covers the bevel (14) over its entire length.
• the method can use a stripper device comprising a flat blade oriented perpendicular to a longitudinal axis of the cable.
• FIG. 1 shows a power cable according to the invention presented in an exploded view in order to identify the main layers that compose it;
• FIG. 2 shows a detail view of a termination according to the invention implementing a composite end of a cable according to the invention in cooperation with a deflection cone;
• FIG. 3 shows a view of detail A of Figure 2;
• FIG. 4 and [Fig. 5] represent a perspective view of a stripper device implemented in the method according to the invention
• FIG. 6 represents a schematic view of the principle representing the blade of the stripper device relative to the end of the cable in a method according to the invention
• FIG. 7 represents the beveling step of the method according to the invention in which the outer semiconductor layer is bevelled with a glass slide.
• a high-voltage power cable 1, illustrated in FIG. 1, comprises an elongated central conductor element 2, in particular made of copper or aluminum.
• the power cable 1 further comprises several layers disposed successively and coaxially around this conductive element 2, considered successively from the innermost to the outermost, namely: a first semiconducting layer 3 called “internal semiconducting layer”, an electrically insulating layer 4, a second semi-conductive layer 5 called the “external semi-conductive layer”, a metal screen 6 for grounding and/or protection, and an outer protective sheath 7.
• the presence of the metal screen 6 and the outer protective sheath 7 is preferred, but not essential, this cable structure being as such well known to those skilled in the art.
• the end 8 of this cable is intended to be connected to a connector (not shown) in order to form a termination in particular inside an anti-deflagration terminal 10, terminal whose cylindrical sleeve 18 is shown in Figure 2.
• This end 8 means a portion 9 of the cable 1 extending between its free end 11 and an unstripped edge 12 of the outer semi-conducting layer 5.
• the cable 1 is surrounded by a deflecting cone 20
• This cone 20 comprises a body 21 mounted around the insulating layer 4, this body comprising an annular lip 22 extending over part of the portion 9 of the cable. More particularly, this annular lip 22 extends partly around a free end 13 of the outer semiconductor layer 5. Preferably the annular lip 22 extends around the outer semiconductor layer 5, beyond the unstripped edge 12.
• the lip 22 is made of flexible material, capable of deforming radially around the cable 1 in order to produce an annular seal around the outer semi-conducting layer 5.
• cylindrical sleeve 18 is replaced by an insulating sleeve comprising epoxy.
• This insulating sleeve has a smooth outer circumference.
• the outer semiconductor layer 5 has a bevel 14 between its free end 13 and a non-stripped edge 12 of this layer 5.
• the annular lip can cover the bevel 14 over its entire length .
• the free end 13 forms an edge of the bevel 14.
• the bevel 14 defines a frustoconical surface.
• the slope a of this bevel is less than 10°, preferably less than 2°, for example of the order of 1.6°.
• This slope a extends over an axial length of the order of 10 cm along the longitudinal axis of the cable.
• the edge of bevel 13 defines a ring extending substantially in a plane orthogonal to the longitudinal axis. Thanks to the preparation process according to the invention, the edge of the bevel 13 extends in an annular zone of length I of less than 10 mm, preferably of less than 5 mm.
• FIG 4 shows a stripper device 30, wherein a blade 31 is driven in a helical motion around the cable.
• the stripping begins from the free end 11 of the cable to the free end 13 of the outer semi-conducting layer 5.
• the blade 31 defines a cutting edge 32 substantially in the plane orthogonal to the longitudinal axis X.
• the blade 31 is more in a plane forming a slight angle p with the tangency at the bare outer periphery of the insulating layer 4.
• One edge of this blade 31 remains in contact with the insulating layer 4 during its helical movement around the cable.
• the material of the outer semi-conducting layer 5 is removed by stripping as far as the free end 13.
• an operator in charge of the preparation has a circumferential marker 33 around the outer semiconductor layer 5, in order to delimit the area to be beveled.
• the operator uses a glass slide 34 and performs longitudinal back and forth movements which it repeats over all the angular sectors of the area to be bevelled.
• the beveling is done manually so that the slope only varies by + or - 0.2° between the bevel edge 13 and the non-stripped edge 12.

Landscapes

• Processing Of Terminals (AREA)
• Cable Accessories (AREA)
• Removal Of Insulation Or Armoring From Wires Or Cables (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=80735848

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (12)

• 2021
  • 2021-12-23 FR FR2114447A patent/FR3131470B1/fr active Active
• 2022
  • 2022-12-16 US US18/723,797 patent/US20240405537A1/en active Pending
  • 2022-12-16 EP EP22847568.7A patent/EP4454084A1/de active Pending
  • 2022-12-16 WO PCT/FR2022/052398 patent/WO2023118709A1/fr not_active Ceased

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