WO2014000821A1 - Système d'isolation pour isolation électrique ccht et dispositif ccht pourvu d'un système d'isolation pour isolation électrique ccht - Google Patents

Système d'isolation pour isolation électrique ccht et dispositif ccht pourvu d'un système d'isolation pour isolation électrique ccht Download PDF

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Publication number
WO2014000821A1
WO2014000821A1 PCT/EP2012/062765 EP2012062765W WO2014000821A1 WO 2014000821 A1 WO2014000821 A1 WO 2014000821A1 EP 2012062765 W EP2012062765 W EP 2012062765W WO 2014000821 A1 WO2014000821 A1 WO 2014000821A1
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WIPO (PCT)
Prior art keywords
insulation
conductivity
insulation system
layer
xlpe
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PCT/EP2012/062765
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English (en)
Inventor
Gustavo Dominguez
Andreas FRIBERG
Anneli JEDENMALM
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Abb Research Ltd
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Priority to PCT/EP2012/062765 priority Critical patent/WO2014000821A1/fr
Publication of WO2014000821A1 publication Critical patent/WO2014000821A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0291—Disposition of insulation comprising two or more layers of insulation having different electrical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes

Definitions

  • the present invention relates to the field of electrical insulation, and in particular to the electrical insulation in high voltage DC systems.
  • High Voltage Direct Current (HVDC) power cables are used to transfer electrical power from one location to another, and are often buried underground or placed at the bottom of the sea. Unless the cables are appropriately insulated, significant leakage currents will flow in the radial direction of the cables, from the conductor to the surrounding ground/water. Such leakage currents give rise to significant power loss and should therefore be avoided.
  • HVDC High Voltage Direct Current
  • Insulation systems where an insulating material of low electrical conductivity is arranged to surround the conductor of an HVDC power cable are widely used. Since the thermal energy released in the cable needs to be allowed to leave the cable, there is a desire to limit the thickness of the insulation system surrounding the conductor. Moreover, an insulation system of lower thickness would make the power cables easier to handle and transport. Thus, there is a desire to find HVDC insulation systems of improved insulation properties. Summary
  • a problem to which the present invention relates is how to improve the electrical properties of electrical insulation systems for HVDC applications.
  • an HVDC insulation system including at least two insulation layers: at least one insulation layer formed from a first material, and at least one insulation layer formed from a second material, where the conductivity of the second material is higher than the conductivity of the first material.
  • the fraction of the total thickness of the insulation system that is formed by the at least one insulation layer of the first material falls within the range of 0.40 - 0.75.
  • a further reduction in the equivalent conductivity of the insulation system will often occur if the thickness fraction, which is formed by the material having the lowest conductivity, falls around 60 %. Furthermore, the breakdown probability goes down as the fraction of the first material increases. Hence, even more favourable electrical properties can be achieved if the fraction of the total thickness which is formed by the first material falls within the range of 0.55 - 0.75.
  • the first material can for example be a polyolefin containing an inorganic filler for reducing the conductivity, wherein the inorganic filler is chosen from the following groups: metal oxides, clays, carbonates, nitrides, borates, silicon oxide.
  • the inorganic filler is chosen from the following groups: metal oxides, clays, carbonates, nitrides, borates, silicon oxide.
  • examples of such inorganic fillers are zinc oxide, magnesium oxide, silicon dioxide, aluminum oxide, iron oxide, kaolin, carbon black, silicon carbide, barium titanium oxide etc.
  • the percentage of MgO in the first material can for example lie within the range of 0.1 wt% - 6 wt%. Within this range, MgO exhibits a negative electric field derivative of the conductivity for some electric fields.
  • the first material such that the derivative of the conductivity with respect to electric field takes a negative value for at least part of the electric field range to be expected in the insulating layer(s) of said first material when an apparatus, in which the insulation system is arranged, is in use, the equivalent conductivity of the insulation system can be further reduced.
  • an HVDC insulation system including at least two insulation layers: at least one insulation layer formed from a first material, and at least one second insulation layer formed from a second material, where the conductivity of the second material is higher than the conductivity of the first material.
  • the first material is a material for which the derivative of the conductivity with respect to electric field takes a negative value for at least part of the electric field range to be expected in the insulating layer(s) formed from said first material when an apparatus, in which the insulation system is arranged, is in use.
  • the equivalent conductivity of the insulation system will be low.
  • the first material could be a polyolefin containing an inorganic filler for reducing the conductivity, wherein the inorganic filler is chosen from the following groups: metal oxides, clays, carbonates, nitrides, borates, silicon oxide.
  • the inorganic filler is chosen from the following groups: metal oxides, clays, carbonates, nitrides, borates, silicon oxide.
  • examples of such inorganic fillers are zinc oxide, magnesium oxide, silicon dioxide, aluminum oxide, iron oxide, kaolin, carbon black, silicon carbide, barium titanium oxide etc.
  • the insulation systems described above could for example be used in the insulation of a device such as an HVDC power cable, an HVDC cable accessory or an HVDC bushing.
  • the insulation layers are concentrically arranged to surround the device.
  • the outermost insulation layer could be formed from a material, the conductivity of which is higher than the conductivity of the first material.
  • the innermost insulation layer could similarly be formed from a material, the conductivity of which is higher than the conductivity of the first material.
  • the insulation systems described above can, if desired, comprise at least one insulation system of at least one further insulating material, where the conductivity of the further material(s) is higher than the conductivity of the first material.
  • the second material could for example be a polyolefin, a resin or a rubber. Any further insulation materials could for example also be a polyolefin, a resin or a rubber.
  • Fig. 1 is a schematic illustration of an HVDC power cable including an embodiment of an insulation system which includes a first and second insulation layer.
  • Fig. 2 is a graph illustrating results of measurements of the conductivity as a
  • Fig. 3 is a graph illustrating the equivalent conductivity as a function of XLPE layer thickness for an insulating system comprising an XLPE and an XLPE-MgO layer, for an average electric field of 25 MV/m.
  • Fig. 4 is a graph illustrating the product of the conductivity and the electric field as a function of electric field for an XLPE material and an XLPE-MgO material.
  • Fig. 5 is a graph illustrating the equivalent conductivity and breakdown probability of a layered XLPE/XLPE-MgO insulation system as a function of
  • Fig. 6 is a graph illustrating the electric field distribution in a power cable
  • Fig. 7 is a schematic illustration of a power cable including an embodiment of an insulation system which includes three insulation layers.
  • FIG. 1 A schematic illustration of an example of an HVDC power cable 100 is shown in Fig. 1.
  • the power cable 100 of Fig. 1 comprises a conductor 105, concentrically surrounded by a first insulating layer 1 lOi and a second insulating layer 1 l Oii.
  • An HVDC power cable typically includes only a single conductor 105.
  • the first and second insulation layers together form an HVDC insulation system 120.
  • the thickness of the insulation system 120 is denoted D
  • the thickness of the first insulation 1 lOi layer is denoted dnoi
  • the thickness of the second insulation layer 1 lOii is denoted duou.
  • the diameter of the conductor 105 is denoted ⁇ 0 .
  • the reference numeral 1 10 will be used.
  • the current I r in the radial direction of the cable 100 will have the same value through each of the insulation layers in an insulation system 120. Ohm's law then gives:
  • V is the voltage across an insulating layer in the radial direction
  • R is the resistance in the radial direction
  • the subscripts 1 lOi and 1 lOii refer to different layers of the insulation system 120.
  • the area A denote the area of the insulation system 120 through which a leakage current may flow, so that for an insulation system 120 concentrically surrounding a circular conductor 105, the area A denotes the lateral area of the cylinder formed by the insulation system 120.
  • the area A 110 then denotes the corresponding area of an insulation layer 110.
  • the voltage V across the insulation system 120 can be expressed as:
  • the right hand side of expression (3) would have an additional term for each of such additional insulation layers.
  • materials that are often used in insulation systems for power cables are different polyolefins, for example polyethylene (PE, LLDPE, LDPE, HDPE),
  • PP polypropylene
  • EPR ethylene propylene rubber
  • Other resin, polymer or rubber materials may alternatively be used.
  • the insulating material may or may not be cross- linked.
  • inorganic filler particles to a matrix of an insulation material
  • the insulating properties of the material can be improved.
  • additives include metal oxides, clays, carbonates, nitrides, borates and silicon oxides, for example zinc oxide, magnesium oxide, silicon dioxide, aluminum oxide, iron oxide, kaolin, carbon black, silicon carbide, barium titanium oxide etc.
  • the effect of reducing the conductivity by means of adding inorganic particle fillers to a matrix of insulating material is generally stronger if the particles are nano-sized.
  • an insulating material comprising inorganic fillers is cross-linked polyethylene (XLPE) to which particles of magnesium oxide (MgO) have been added, such material here being referred to as XLPE-MgO.
  • the total thickness of the insulation system 120 should preferably be small.
  • the insulating properties of the insulation system 120 depend on the insulation thickness, and a thinner insulation system 120 generally provides poorer insulation properties. Thus, a suitable balance between good insulation properties and good cooling properties of the power cable 100 has to be found.
  • our experimental studies on XLPE-MgO have shown that for certain electric fields, the derivate of the conductivity with respect to the electric field takes negative values. Hence, for certain electric fields, the conductivity of XLPE- MgO decreases with increasing electric field.
  • Fig. 2 experimental results for the conductivity ⁇ as a function of applied electric field E is shown for one XLPE and one XLPE-MgO material, the two materials being specified below:
  • the XLPE material is a cross-linked low density polyethylene (XLPE) with a cross- linking agent of diculym peroxide (DCP) at a concentration of 0.6 wt%
  • the XLPE-MgO material comprises XLPE with 0.6% DCP as a matrix, to which 1,5 wt% of MgO has been added, where the average size of the MgO particles were 20 nm.
  • results of measurements performed on the XLPE material are indicated by crosses, while results of measurements performed on the XLPE-MgO material are indicated by dots. (Further measurements were made and were used in the fits discussed below, but are not included in the graph).
  • the conductivity of the XLPE material, GXLPE is higher than the conductivity of the XLPE-MgO material, axLPE Mgo-
  • the conductivity of the XLPE material GXLPE is higher than the conductivity of the XLPE-MgO material a uE-Mgo, although cxxLPE-Mgo niay be higher for one field than OXLPE is for another field.
  • negative-E-derivative material materials exhibiting a negative field derivative of the conductivity will be referred to as negative-E-derivative material.
  • negative-E-derivative material materials exhibiting a negative field derivative of the conductivity.
  • GXLPE (E) ⁇ o ⁇ aE
  • values of axLPE-M g o(E) have been obtained by performing a spline fit of experimental values.
  • the insulating system 120 for which properties are plotted in Figs. 4 and 6 is formed from layers of materials of different conductivities, no value of a homogenous conductivity can be defined for the insulation system 120.
  • the equivalent conductivity ⁇ will be used when discussing the conductive properties of the insulation system 120.
  • the equivalent conductivity ⁇ for a planar geometry is defined as where R is the resistance of an area A of the insulation system, and D is the total thickness of the insulation system 120 used in the calculations.
  • Fig. 3 the equivalent conductivity of an insulation system 120 formed from the materials XLPE and XLPE-MgO as defined under A) and B) above is plotted as a function of the thickness of the XPLE layer, dxpLE, at a total thickness D of 20 mm and a nominal voltage of 500 kV. Indicated in the graph is also the conductivity of the XLPE material, CT LPE, as well as the conductivity of the XPLE-MgO material, axLPE-Mgo, at the electric field of 25 MV/m, corresponding to the situation if only one insulation material had been present.
  • dxLPE there is a range of dxLPE within which the equivalent conductivity ⁇ of the insulation system XLPE/XLPE-MgO will be lower than if the entire insulation system 120 were made up of XLPE-MgO.
  • the electric field in the XLPE-MgO layer in a layered structure will here be referred to as E x a L y p e E Mg0
  • the electric field in the XLPE layer in a layered structure will be referred to as E X l L v PE ed
  • the electric field in the single layers will be referred to as ⁇ ⁇ 8 an d ExLPE-MgO ' respectively.
  • E ⁇ (E) for a particular insulation system 120 having insulating layers 1 10 of the two materials XLPE and XLPE-MgO, to which a particular voltage V has been applied.
  • Which value of E ⁇ (E) is obtained for a particular insulation system 120 depends on the applied voltage, V.
  • the resulting electric field in the XLPE material is indicated in the figure as E XL PE, while the resulting electric field in the XLPE-MgO material is indicated as E XL pE-M g o.
  • the range can be expressed as if dxLPE-Mgo corresponds to 35% - 75% of the total thickness D, i.e. dxLPE ⁇ M9 ° ⁇ Q& wl thin the range of 0.35 - 0.75.
  • the graph was obtained from measurements on a two layer insulation system 120 of XLPE and XLPE-MgO as defined under A) and B) above, respectively, wherein the total thickness of the insulation system 120 was 20 mm and the nominal voltage was 500 kV.
  • the results shown in Fig. 5 can generally be extrapolated to other combinations of nominal voltage and total insulation thickness D, since the range of suitable total insulation thickness typically scales well with the nominal voltage of the power cable 100.
  • Fig. 5 also shows how the breakdown probability P of the XLPE/XLPE-MgO insulation system 120 varies with the
  • the breakdown probability P exhibits a peak when dxLPE-Mgo is approximately 3/10 D.
  • the electric field across the XLPE-MgO layer will be at a level where the probability of breakdown is
  • the fraction of XLPE-MgO could advantageously be chosen such that dxLPE ⁇ M3 ° > 2/5.
  • d LFg M9 ° falls within the range of 0.40 - 0.75.
  • ao is the breakdown strength at the reference thickness and m is a constant, which was determined to 0.222.
  • the breakdown probability of the insulation system 120 shown in Fig. 5 was then obtained as a sum of the breakdown probabilities of the different insulation layers 110, using expression (6):
  • z-1 to n are indices referring to different insulation layers 110, where E; is the calculated electric field in insulation layer i when insulation layer i takes up a thickness di of the total thickness D.
  • the breakdown strength data of Fig. 5 were also obtained for a total thickness D of 20 mm and a nominal voltage of 500 kV.
  • the difference in conductivity between such insulating material and the semiconductor material is typically large, thus giving rise to a large discontinuity in the radial electric field component at the interface between the insulating material and the semiconductor layer. It is hence often desirable to keep the electric field low at the side of the insulation system 120 which faces away from the conductor 105, towards the surrounding, this side being referred to as the outside of the insulation system 120.
  • the electrical conductivity of the outermost insulating layer of insulation system 120 could be any electrical conductivity of the outermost insulating layer of insulation system 120 .
  • an insulation system 120 may comprise further insulating layers 110).
  • the material forming the insulating layer(s) 110 of the lowest conductivity will be referred to as the main insulating material.
  • the outermost insulating layer of insulation system 120 will be referred to as the outermost insulating layer 110.
  • any further insulating layers could be located either between the conductor 105 and an insulation layer 110 of the main insulating material, and/or between the outermost insulating layer and an insulation layer 110 of the main insulating material.
  • an HVDC power cable 100 may include, in addition to the insulating system 120, semiconducting layers and/or screening layers, etc, which have not been shown in Fig. 1 or Fig. 7.
  • Fig. 6 is a schematic illustration of how the radial component of the electric field, Er, will vary with the distance dr from the centre of the conductor 105 in an HVDC power cable 100 having two insulation layers, where the outermost insulating layer 1 lOii is of higher conductivity than the inner insulation layer 11 Oi, the inner insulating layer being formed from the main insulating material.
  • the conductor 105 is at the electrical potential corresponding to the voltage of the power transmission.
  • the conductivity of the conductor 105 is high, resulting in an electric field in the conductor 105 being close to zero.
  • the voltage V at different points of the cable cross-section is illustrated in Fig. 6 by a dashed line.
  • the outermost layer 1 lOii is grounded, whereas in many implementations, further layers, such as semi-conducting layers or screening layers, will be located outside of the outermost layer 110.
  • the HVDC insulation system 120 illustrated in Fig. 6 is arranged such that the conductivity of the inner insulation 1 lOi is lower than the conductivity of the outermost insulation layer 11 Oii, the electric field in the inner insulation layer 11 Oi is higher than the electric field in the outermost layer 1 lOii (cf. expression (1)).
  • an insulation system 120 comprising two insulation layers 110 formed from different materials.
  • the effect of a reduction in the equivalent conductivity ⁇ can also be achieved for insulation systems 120 of three or more insulation layers 110, where two or more different materials can be used to form the different insulation layers 110.
  • a multilayer insulation system 120 only two different insulation materials are used, so that the two different materials are alternatingly arranged.
  • the results obtained for the two layer system and illustrated in Figs. 4 and 6 also apply to a multi-layer system of two or more different materials, as long as the fraction of the total thickness D which is formed by the material showing the lowest conductivity falls within the range of 0.40 - 0.75.
  • the reduction in equivalent conductivity achieved by using a layered insulation system 120 wherein at least one layer comprises a negative-E-derivative material can be achieved regardless of at which position in the insulation system the negative-E-derivative material is located. In some embodiments, however, the negative-E-derivative material will be used as an inner insulation layer 1 10, and the outermost insulation layer will be formed from another material. If the outermost insulation layer is made from a material having a higher conductivity than the negative-E-derivative material, the electric field at the outside of the insulation system 120 will be lower.
  • FIG. 7 An illustration of a three-layered insulation system 120, comprising an innermost layer 1 lOi, an inner (middle) layer 1 lOii and an outermost layer 1 lOiii is shown in Fig. 7.
  • the middle layer 11 Oii could be of a material having lower conductivity than the materials used in the outer and inner layers.
  • the innermost and outermost layer could for example be formed from the same material.
  • the insulation layer(s) of lowest conductivity could for example be formed from a matrix material to which particles of an inorganic filler has been added.
  • the other insulation layer(s) 110 could then for example be formed from the matrix material of the main insulation material, with or without additives, or from any other suitable insulation material.
  • the main insulation material is XLPE-MgO and the inner and outer insulation layers are formed from XLPE.
  • the results presented in Figs. 2-5 above have been obtained from measurements on materials as defined above under A) and B). However, similar results would be obtained on other compositions of the XLPE material and of the XLPE-MgO material.
  • the XLPE could comprise a different crosslinking agent, such as silanes or peroxides; the XLPE could comprise the crosslinking agent DCP in a different concentration, such as within the range of 0.1-2.2 wt%; or it could contain no crosslinking agent at all (the polyethylene then not being cross-linked).
  • the XLPE-MgO could contain MgO of a different concentration, for example in the range of 0.1-6 wt%; the MgO particles could be of a different size, for example within the range of 1-200 nm; and the XLPE matrix of the XLPE-MgO could be varied as described above in relation to the XLPE material.
  • the XLPE material and/or the matrix of the XLPE-MgO material could be replaced by another insulating polyolefin, an insulating resins or an insulating rubber, examples of which are given above.
  • the insulation layer 110 having the lowest conductivity is formed by a matrix material to which inorganic filler particles have been added.
  • inorganic filler particles include metal oxides, clays, carbonates, nitrides, borates and silicon oxides, for example zinc oxide, silicon dioxide, aluminum oxide, iron oxide, kaolin, carbon black, silicon carbide, barium titanium oxide etc.
  • the inorganic filler could for example be of a concentration within the range of 0.1-6 wt%.
  • the matrix material, as well as a second and possibly further materials from which at least one insulation layer 110 is formed, could for example be different polyolefins, for example polyethylene (PE, LLDPE, LDPE, HDPE), polypropylene (PP), ethylene propylene rubber (EPR). Other resin, polymer or rubber materials may alternatively be used.
  • the insulating materials may or may not be cross-linked.
  • the layered insulation system 120 has been presented above in relation to insulation of
  • HVDC power cables HVDC power cables.
  • an insulation system 120 according to the invention could be applied in any HVDC device wherein a varying electric field across an insulation system 120 can be beneficial, such as in HVDC cable accessories (including e.g. cable joints, cable terminations and cable connectors); in HVDC bushings etc.
  • HVDC devices typically include a single conductor, around which the insulation layers of the insulation system 120 are concentrically arranged.
  • the invention is applicable to HVDC devices of all nominal voltages, although the benefits of low conductivity will be more pronounced for devices of nominal voltage of around 300 kV and higher.

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Abstract

La présente invention concerne un système d'isolation (120) comprenant au moins deux couches isolantes (110) : au moins une couche isolante (110) formée dans un premier matériau, et au moins une couche isolante formée dans un second matériau, la conductivité du second matériau étant supérieure à celle du premier matériau. La fraction de l'épaisseur totale du système d'isolation qui est formé par ladite au moins une couche isolante du premier matériau s'inscrit dans la plage comprise entre 0,40 et 0,75.
PCT/EP2012/062765 2012-06-29 2012-06-29 Système d'isolation pour isolation électrique ccht et dispositif ccht pourvu d'un système d'isolation pour isolation électrique ccht WO2014000821A1 (fr)

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PCT/EP2012/062765 WO2014000821A1 (fr) 2012-06-29 2012-06-29 Système d'isolation pour isolation électrique ccht et dispositif ccht pourvu d'un système d'isolation pour isolation électrique ccht

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PCT/EP2012/062765 WO2014000821A1 (fr) 2012-06-29 2012-06-29 Système d'isolation pour isolation électrique ccht et dispositif ccht pourvu d'un système d'isolation pour isolation électrique ccht

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017017354A1 (fr) * 2015-07-27 2017-02-02 Nexans Câble comprenant une couche isolante moussée et réticulée

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US3663742A (en) * 1969-10-06 1972-05-16 Furukawa Electric Co Ltd Method of mitigating sulfide trees in polyolefin insulated conductors
US20120000694A1 (en) * 2010-04-02 2012-01-05 Ls Cable & System Ltd. Insulation material composition for dc power cable and the dc power cable using the same
EP2450910A1 (fr) * 2010-11-03 2012-05-09 Borealis AG Composition polymère et câble électrique comprenant la composition polymère

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US3663742A (en) * 1969-10-06 1972-05-16 Furukawa Electric Co Ltd Method of mitigating sulfide trees in polyolefin insulated conductors
US20120000694A1 (en) * 2010-04-02 2012-01-05 Ls Cable & System Ltd. Insulation material composition for dc power cable and the dc power cable using the same
EP2450910A1 (fr) * 2010-11-03 2012-05-09 Borealis AG Composition polymère et câble électrique comprenant la composition polymère

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NGUYEN; SHKLOVSKII, SOLID STATE COMMUN., vol. 38, 1981, pages 99
R. LIU ET AL., CEIDP, 2011, pages 518 - 521

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017017354A1 (fr) * 2015-07-27 2017-02-02 Nexans Câble comprenant une couche isolante moussée et réticulée
FR3039697A1 (fr) * 2015-07-27 2017-02-03 Nexans Cable comprenant une couche isolante moussee et reticule

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