FR2465301A1 - High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage - Google Patents

High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage Download PDF

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Publication number
FR2465301A1
FR2465301A1 FR7922385A FR7922385A FR2465301A1 FR 2465301 A1 FR2465301 A1 FR 2465301A1 FR 7922385 A FR7922385 A FR 7922385A FR 7922385 A FR7922385 A FR 7922385A FR 2465301 A1 FR2465301 A1 FR 2465301A1
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FR
France
Prior art keywords
sealing material
high voltage
voltage cable
cable according
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7922385A
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French (fr)
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FR2465301B1 (en
Inventor
Gerard Gagneux
Valentin Bardoux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jeumont Schneider SA filed Critical Jeumont Schneider SA
Priority to FR7922385A priority Critical patent/FR2465301A1/en
Publication of FR2465301A1 publication Critical patent/FR2465301A1/en
Application granted granted Critical
Publication of FR2465301B1 publication Critical patent/FR2465301B1/fr
Granted legal-status Critical Current

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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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
    • H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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  • Insulated Conductors (AREA)

Abstract

The cable comprises an axial conductor covered by a semiconducting layer, which in turn is covered by an insulating layer. A second semiconducting layer lies between the insulator and a screen. An outer insulating layer forms a protective sleeve around the cable. The screen consists of a metallic plate adjacent to the outer sleeve, inside which there is a set of conductive wires. The wires lie parallel to the axis of the cable, and touch each other. The spaces between the conducting wires are filled with a sealing material - for for example powdered cellulose. The sealing compound ensures that damage to the metallic plate in one region does not result in water penetrating the whole length of the cable.

Description

CABLE HT A ECRAN MIXTE
La pressente invention concerne les câbles électriques du type haute tension et, plus particulièrement, les câbles HT à écran mixte constitués par une feuille métallique en contact électrique avec des fils conducteurs disposés de façon sensiblement longitudinale.HT CABLE WITH MIXED SCREEN
The present invention relates to electrical cables of the high-voltage type and, more particularly, HV cables with mixed screen constituted by a metal foil in electrical contact with conductive wires arranged in a substantially longitudinal manner.

On sait que l'écran, dans un câble HT, a pour fonctions principales, d'une part, découler le courant de court-circuit éventuel, et, d'autre part, d'assurerl'e'- tanchéité du câble de façon à protéger notamment de l'eau les isolants dont les caractéristiques diélectriques pourraient être modifiées en présence d'eau. We know that the screen, in an HV cable, has the main functions, on the one hand, to generate any short-circuit current, and, on the other hand, to ensure the cable's sealing so to protect in particular from water insulators whose dielectric characteristics could be modified in the presence of water.

L'utilisation d'un écran mixte constitué par une feuille métallique par exemple d'aluminium ou de cuivre, en forme de cylindre et collée a recouvrement, et par une nappe de fils conducteurs dont le nombre et la section sont adaptés aux courants de court-circuit à écouler , permet d'assurer favorablement les deux fonctions. The use of a mixed screen made up of a metal sheet, for example of aluminum or copper, in the shape of a cylinder and glued with overlap, and by a sheet of conductive wires, the number and section of which are adapted to short currents -circuit to flow, allows to ensure favorably the two functions.

Toutefois, en cas de détérioration locale de la feuille métallique de l'écran, l'étanchéité n'est plus assurée et l'humidité peut s'infiltrer dans l'isolant et se propager dans le câble , en particulier, dans le sens longitudinal. However, in the event of local deterioration of the metal sheet of the screen, the sealing is no longer ensured and the humidity can seep into the insulation and propagate in the cable, in particular, in the longitudinal direction. .

Pour obvier à cet inconvénient, il a été proposé de disposer la feuille métallique de l'écran,pour la protéger, en dessous des fils conducteurs qui sont alors entoures par une hélice de contact constituée par une bande de cuivre. To overcome this drawback, it has been proposed to arrange the metal sheet of the screen, to protect it, below the conductive wires which are then surrounded by a contact helix constituted by a copper strip.

Cette solution est coûteuse et n'assure de toute façon pas lsétanchéité requise en cas de percement de la feuille métallique. This solution is costly and does not in any case provide the required tightness if the metal sheet is pierced.

La présente invention a pour but d'assurer cette étanchéité même en cas de détérioration locale de la fe-uille métallique. The present invention aims to provide this seal even in the event of local deterioration of the metal sheet.

Selon l'invention, le câble HT dont l'écran mixte est dispo-sé entre une couche externe formant gaine de protection et une couche semi-conductrice recouvrant l'isolant de l'âme conductrice, est caractérisé en ce que des matières d'étanchéité sont introduites dans les intervalies laissés libres entre les fils conducteurs et la feuille métallique d'une part, et la couche im médiatement adjacente aux fils conducteurs d'autre part. According to the invention, the HV cable, the mixed screen of which is provided between an outer layer forming a protective sheath and a semiconductor layer covering the insulator of the conductive core, is characterized in that materials of sealing are introduced into the gaps left free between the conductive wires and the metal foil on the one hand, and the layer im immediately adjacent to the conductive wires on the other hand.

L'invention sera mieux comprise et d'autres buts, avantages et caractéristiques apparaîtront plus clairement à la lecture de la description qui suit à laquelle est annexé un dessin. The invention will be better understood and other objects, advantages and characteristics will appear more clearly on reading the description which follows to which a drawing is annexed.

La figure 1 représente schématiquement en demicoupe un câble HT selon un premier mode de réalisation de l'invention et,
La figure 2 représente schématiquement en demicoupe un câble HT selon un second mode de réalisation de l'invention.FIG. 1 schematically shows a half-section of an HV cable according to a first embodiment of the invention and,
FIG. 2 schematically shows a half-section of an HV cable according to a second embodiment of the invention.

Bien évidemment, sur les deux figures, les mêmes références désignent les mêmes éléments. Obviously, in the two figures, the same references designate the same elements.

L'âme conductrice 1 est recouverte d'une première couche semi-conductrice 2 elle-même recouverte d'un isolant 3. Une seconde couche semi-conductrice 4 est disposée entre l'écran et l'isolant 3. Recouvrant l'e- cran, une couche- 5 forme gaine de protection du câble. The conductive core 1 is covered with a first semiconductor layer 2 which is itself covered with an insulator 3. A second semiconductor layer 4 is placed between the screen and the insulator 3. Covering the e- notch, a layer-5 sheath protecting the cable.

En référence maintenant à la figure 1 où est représenté en demi-coupe un câble HT selon un premier mode de réalisation de l'invention, la feuille métal lique 6 est adjacente à la gaine de protection 5. Les fils conducteurs 7 sont disposés de façon sensiblement longitudinalc entre la feuille métallique 6 et la cou ciie scmi-corl < luctri.cc? 4. Les intervalles 8 et 9 laisses libres entre les fils conducteurs 7 et la feuille métallique 6 d'une part et la couche semi-conductrice 4 d'autre part, sont remplis avec une matière d'étanchéité constituée par exemple par de la poudre de cellulose. Referring now to FIG. 1 where a HV cable is shown in half-section according to a first embodiment of the invention, the metal sheet 6 is adjacent to the protective sheath 5. The conductive wires 7 are arranged so substantially longitudinal between the metallic sheet 6 and the scmi-corl neck <luctri.cc? 4. The intervals 8 and 9 free leashes between the conducting wires 7 and the metal foil 6 on the one hand and the semiconductor layer 4 on the other hand, are filled with a sealing material constituted for example by powder cellulose.

De ce fait, d'une perforation locale de la feuille métallique 6 ne résulte pas une propagation de l'humidi-r té le long du câble.Therefore, a local perforation of the metal sheet 6 does not result in a propagation of the humid-ty along the cable.

La figure 2 représente en demi-coupe un câble HT selon un second mode de réalisation de l'invention. Figure 2 shows in half-section an HV cable according to a second embodiment of the invention.

Sur cette figure, la feuille métallique 6 recouvre la couche semi-conductrice 4 tandis que les fils conducteurs 7 sont disposés de façon sensiblement longitudinale entre la gaine de protection 5 et la feuille métallique 6. Les intervalles 8 et 9 laissés libres entre les fils conducteurs 7 et la feuille métallique 6 d'une part et la couche formant gaine de protection 5 d'autre part sont remplis avec des matieres d'étanchéité. In this figure, the metal sheet 6 covers the semiconductor layer 4 while the conductive wires 7 are arranged in a substantially longitudinal manner between the protective sheath 5 and the metal sheet 6. The intervals 8 and 9 left free between the conductive wires 7 and the metal foil 6 on the one hand and the protective sheath layer 5 on the other hand are filled with sealing materials.

Les exigences de non-contamination imposées a la matière introduite dans les intervalles 8 et 9 de la figure 2 sont beaucoup plus faibles que celles imposées à la matière d'étanchéité introduite dans les intervalles 8 et 9 de la figure 1. De ce fait, la matière d'étanchéité introduite dans les intervalles 8 et 9 de la figure 2 peut être favorablement constituée par une matière d'étanchéité utilisée pour les câbles basse tension telle une matière incluant du silicate d'alumine et de la vaseline industrielle.The non-contamination requirements imposed on the material introduced in the intervals 8 and 9 of FIG. 2 are much lower than those imposed on the sealing material introduced in the intervals 8 and 9 of FIG. 1. Therefore, the sealing material introduced in the intervals 8 and 9 of FIG. 2 can be favorably constituted by a sealing material used for low voltage cables such as a material including alumina silicate and industrial petroleum jelly.

Bien que seuls deux modes de réalisation de l'invention aient e' été décrits, il est évident que toute modification apportée par l'Homme de l'Art dans l'esprit de l'invention ne sortirait pas du cadre de la présente invention. Par exemple, les fils conducteurs 7 peuvent avoir une section ronde ou rectangulaire ; ils peuvent également être joints ou disjoints. Enfin, ils peuvent être disposes parallèlement à l'axe du câble ou bien de manière ondulée le long du câble ou bien encore en forme d'hélices de très grand pas par rapport à la section du câble. Although only two embodiments of the invention have been described, it is obvious that any modification made by a person skilled in the art in the spirit of the invention would not depart from the scope of the present invention. For example, the conducting wires 7 can have a round or rectangular section; they can also be joined or disjoint. Finally, they can be arranged parallel to the axis of the cable or alternatively wavy along the cable or alternatively in the form of helices of very large pitch with respect to the section of the cable.

D'autre part, comme représenté figure 2, des cannelures peuvent être ménagées à la périphérie de la couche semi-conductrice 4. On the other hand, as shown in FIG. 2, grooves can be made at the periphery of the semiconductor layer 4.

Dans ce cas, une matière d'étanchéité telle une poudre de cellulose est introduite dans les creux 10 de ces cannelures de manière à garantir l'étanchéité du câble.In this case, a sealing material such as cellulose powder is introduced into the recesses 10 of these grooves so as to guarantee the tightness of the cable.

En effet, cette matière d'étanchéité est soumise à un champ électrique important qui est engendré entre l'âme conductrice 1 du câble et la feuille métallique 6.Indeed, this sealing material is subjected to a large electric field which is generated between the conductive core 1 of the cable and the metal sheet 6.

En outre, cette matière d'étanchéité peut être mélan gée à des éléments semi-conducteurs et à des éléments présentant une résistance à variabilité non-linéaire en fonction de l'intensité des courants capacitifs de fuite de manière à simplifier les opérations de jonction de câbles. In addition, this sealing material can be mixed with semiconductor elements and with elements having a resistance with non-linear variability as a function of the intensity of the capacitive leakage currents so as to simplify the junction operations of cables.

Claims (7)

REVENDICATIONS 1.- Câble Haute Tension à écran mixte constitué par une feuille métallique conductrice de forme cylindrique en contact avec des fils conducteurs disposés de façon sensiblement longitudinale, le dit écran mixte étant disposé entre une couche externe formant gaine de protection et une couche semi-conductrice recouvrant l'isolant de l'âme conductrice, caractérisé en ce que des matières d'étanchéité sont introduites dans les intervalles (8 et 9) laissés libres entre les fils conducteurs (7) et la dite feuille métallique (6) d'une part, et la couche immédiatement adjacente aux dits fils conducteurs d'autre part.1.- High Voltage cable with mixed screen constituted by a conductive metallic sheet of cylindrical shape in contact with conductive wires arranged in a substantially longitudinal manner, the said mixed screen being disposed between an external layer forming a protective sheath and a semi-conductive layer covering the insulator of the conductive core, characterized in that sealing materials are introduced into the gaps (8 and 9) left free between the conductive wires (7) and said metallic sheet (6) on the one hand , and the layer immediately adjacent to said conductive wires on the other hand. 2.- Câble Haute Tension selon la revendication 1, caractérisé en ce que, la dite feuille métallique (6) étant adjacente à la dite gaine de protection (5), la matière d'étanchéité introduite dans les dits intervalles (8 et 9) est constituée par une poudre de cellulose.2.- High Voltage Cable according to claim 1, characterized in that, said metal sheet (6) being adjacent to said protective sheath (5), the sealing material introduced into said intervals (8 and 9) consists of cellulose powder. 3.- Câble Haute Tension selon la revendication 1 caractérisé en ce que,la dite feuille métallique (6) étant adjacente à la dite couche semi-conductrice (4), la matière d'étanchéité introduite dans les dits intervalles (8 et 9) est constituée par une matière incluant du silicate d'alumine et de la vaseline industrielle.3.- High Voltage Cable according to claim 1 characterized in that, said metallic sheet (6) being adjacent to said semiconductor layer (4), the sealing material introduced into said intervals (8 and 9) consists of a material including alumina silicate and industrial petroleum jelly. 4.- Câble Haute Tension selon la revendication 1 ca ractérisé en ce que, des cannelures étant ménagées à la périphérie de la dite couche semi-conductrice (4), une matière d'étanchéité est introduite dans les creux (10) de ces cannelures entre la dite-couche semiconductrice (4) et le dit ôcran mixte.4.- High Voltage Cable according to claim 1 ca characterized in that, grooves being formed at the periphery of said semiconductor layer (4), a sealing material is introduced into the recesses (10) of these grooves between the said semiconductor layer (4) and the said mixed screen. 5.- Câble Haute Tension selon la revendication 4 caractcMris( cn ce que la dite matière d'nncitE est constitue par ul-le poudre dc cellulose. 5.- High Voltage Cable according to claim 4 caractcMris (cn that said matter of nncitE is constituted by ul-dc cellulose powder. 6.- Câble Haute Tension selon la revendication 4 caractérisé en ce que la dite matière d'étanchéité est mélangée à des éléments semi-conducteurs.6.- High Voltage Cable according to claim 4 characterized in that said sealing material is mixed with semiconductor elements. 7.- Câble Haute Tension selon la revendication 4 caractérisé en ce que la dite matière d'étanchéité est mélangée à des éléments présentant une résistance à variabilité non linéaire en fonction de l'in tensité des courants capacitifs de fuite. 7.- High Voltage Cable according to claim 4 characterized in that said sealing material is mixed with elements having a resistance with non-linear variability as a function of the intensity of the capacitive leakage currents.
FR7922385A 1979-09-07 1979-09-07 High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage Granted FR2465301A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7922385A FR2465301A1 (en) 1979-09-07 1979-09-07 High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7922385A FR2465301A1 (en) 1979-09-07 1979-09-07 High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage

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FR2465301A1 true FR2465301A1 (en) 1981-03-20
FR2465301B1 FR2465301B1 (en) 1982-09-03

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996036054A1 (en) * 1995-05-09 1996-11-14 Freeman Clarence S Non-water permeating power transmission cable
WO1998014960A1 (en) * 1996-09-30 1998-04-09 Bicc Public Limited Company Electric power cables
US6242692B1 (en) 1997-09-11 2001-06-05 Pirelli Cables (2000) Limited Electric power cables
EP2093775A1 (en) * 2008-02-20 2009-08-26 ABB Technology AG An electric power distribution cable and a power distribution arrangement provided therewith

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2104693A1 (en) * 1970-07-30 1972-04-21 Jeumont Schneider
FR2188260A1 (en) * 1972-06-14 1974-01-18 Cables De Lyon Geoffroy Delore
FR2384336A1 (en) * 1977-03-18 1978-10-13 Jeumont Schneider PROCEDURE FOR LONGITUDINALLY WATERPROOFING AN ELECTRIC CABLE WITH SYNTHETIC INSULATION AND CABLE OBTAINED ACCORDING TO THIS PROCEDURE
FR2385194A1 (en) * 1977-03-22 1978-10-20 Siemens Ag HIGH CURRENT SHIELDED CABLE, WITH SYNTHETIC INSULATION AND COVERED WITH A COMPOSITE SHEATH
DE2754336A1 (en) * 1977-12-02 1979-06-07 Aeg Telefunken Kabelwerke Polyolefin-coated power cable - with insulation having outwardly decreasing diffusion slope and enveloped in high lost factor plasticised EPDM rubber
FR2414245A1 (en) * 1978-01-09 1979-08-03 Ceat Ste Fse Medium voltage fire-resistant electrical cable - has corrugated metallic sheath surrounding insulation layer to allow expansion of latter under effects of temp.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2104693A1 (en) * 1970-07-30 1972-04-21 Jeumont Schneider
FR2188260A1 (en) * 1972-06-14 1974-01-18 Cables De Lyon Geoffroy Delore
FR2384336A1 (en) * 1977-03-18 1978-10-13 Jeumont Schneider PROCEDURE FOR LONGITUDINALLY WATERPROOFING AN ELECTRIC CABLE WITH SYNTHETIC INSULATION AND CABLE OBTAINED ACCORDING TO THIS PROCEDURE
FR2385194A1 (en) * 1977-03-22 1978-10-20 Siemens Ag HIGH CURRENT SHIELDED CABLE, WITH SYNTHETIC INSULATION AND COVERED WITH A COMPOSITE SHEATH
DE2754336A1 (en) * 1977-12-02 1979-06-07 Aeg Telefunken Kabelwerke Polyolefin-coated power cable - with insulation having outwardly decreasing diffusion slope and enveloped in high lost factor plasticised EPDM rubber
FR2414245A1 (en) * 1978-01-09 1979-08-03 Ceat Ste Fse Medium voltage fire-resistant electrical cable - has corrugated metallic sheath surrounding insulation layer to allow expansion of latter under effects of temp.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996036054A1 (en) * 1995-05-09 1996-11-14 Freeman Clarence S Non-water permeating power transmission cable
WO1998014960A1 (en) * 1996-09-30 1998-04-09 Bicc Public Limited Company Electric power cables
US6215070B1 (en) 1996-09-30 2001-04-10 Pirelli Cables (2000) Limited Electric power cables
AU739332B2 (en) * 1996-09-30 2001-10-11 Prysmian Cables & Systems Limited Electric power cables
US6242692B1 (en) 1997-09-11 2001-06-05 Pirelli Cables (2000) Limited Electric power cables
EP2093775A1 (en) * 2008-02-20 2009-08-26 ABB Technology AG An electric power distribution cable and a power distribution arrangement provided therewith

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