EP0022745A1 - Electric cable with multi-wire conductor and moisture barrier - Google Patents

Electric cable with multi-wire conductor and moisture barrier Download PDF

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Publication number
EP0022745A1
EP0022745A1 EP80730045A EP80730045A EP0022745A1 EP 0022745 A1 EP0022745 A1 EP 0022745A1 EP 80730045 A EP80730045 A EP 80730045A EP 80730045 A EP80730045 A EP 80730045A EP 0022745 A1 EP0022745 A1 EP 0022745A1
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European Patent Office
Prior art keywords
conductor
plastic
layer
metal
electrically conductive
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Granted
Application number
EP80730045A
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German (de)
French (fr)
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EP0022745B1 (en
Inventor
Manfred Reuter
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Siemens AG
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT80730045T priority Critical patent/ATE6105T1/en
Publication of EP0022745A1 publication Critical patent/EP0022745A1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
    • H01B7/288Preventing 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

Definitions

  • a swellable tape which consists of a water-soluble plastic made with swellable filler and which is primarily used to seal the gap between the cable core and the cable jacket (DE-OS 21 58 996).
  • the invention provides a new design of a single or multi-core electrical cable which has extruded plastic insulation and a metal or plastic sheath and in which at least one conductor is constructed from metal wires or strips and a layer of electrically conductive plastic is assigned to this conductor.
  • the new design is intended to ensure the longitudinal and transverse watertightness of the cable in the area of the multi-wire conductor. According to the invention it is therefore provided that an electrically conductive metal, paper or plastic film is arranged between the conductor and the conductive plastic layer, which is coated on one or both sides with a swelling agent under the influence of moisture.
  • the new design ensures that the cable is watertight in the area of the multi-wire conductor. This applies in particular to concentrically arranged conductors, for example shields of power cables or communication cables, which consist of a layer of round metal wires or a layer of profiled wires or also of two or more spun metal strips.
  • the use of an electrically conductive film ensures the electrical contact between the conductive layer of the cable and the conductor. Even when the electrically conductive film is coated with an insulating swelling agent, contact between the electrically conductive film and the conductor is ensured as a result of the radial pressure conditions.
  • the agent swelling under the influence of moisture which is in particular known cellulose-based substances such as methyl cellulose or ethyl cellulose, can be applied to the electrically conductive film, for example electrostatically or by means of an adhesion promoter such as polyvinyl acetate. Sintering may also be considered. Another possibility is to mix the swelling agent or swelling powder with a paste-like carrier material and to apply the mixture to the electrically conductive film. If necessary, an electrically conductive paste-like carrier can be used here.
  • the coating of the electrically conductive film with the agent swelling under the influence of moisture can be present on one or both sides.
  • the use of a plastic fleece which is enriched with the agent swelling under the action of moisture is particularly advantageous.
  • the figure shows a plastic-insulated medium-voltage cable, on the multi-wire conductor 1, the moisture barrier 2 is applied.
  • This is an electrically conductive plastic fleece, which is enriched with a swelling agent and which is spun onto the conductor in the form of a tape.
  • the extruded polyethylene insulation 3 is located above the barrier layer 2, including an inner conductive layer and an outer conductive layer, also unspecified, as is customary in medium-voltage cables.
  • a further moisture barrier 4 is arranged above it, which likewise consists of an electrically conductive plastic fleece which is enriched with a swelling agent, in particular a swelling powder.
  • the screen 5 made of copper wires is spun onto the barrier layer 4.
  • the outer jacket 6 made of polyvinyl chloride is located above this.

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  • Insulated Conductors (AREA)

Abstract

1. A single- or multi-core electric cable having an extruded plastics insulation (3) and a metal or plastics sheath (6), in which at least one conductor (5) consists of stranded or spun-on metal wires or spun-on metal strips, and in which the conductor (5) is allotted a layer made of electrically-conductive plastics material, characterised in that between the conductor (5) and the conductive plastics layer, there is arranged an electrically-conductive plastic fleece (4) that is saturated with an agent which swells under the influence of moisture.

Description

Die längs- und querwasserdichte Ausgestaltung elektrischer Kabel, die bisher überwiegend bei kunststoffisolierten Nachrichtenkabeln Bedeutung erlangt hat, beschäftigt in zunehmendem Maße auch die Konstrukteure und Werkstofftechniker für kunststoffisolierte Starkstrom- und Hochspannungskabel. Es wird nämlich befürchtet, daß in derartigen Kabeln eingedrungenes Wasser zu einer Verschlechterung der Isoliereigenschaften und unter Umständen sogar zu einem Durchschlag führt. Auch können Garnituren in Mitleidenschaft gezogen werden.The longitudinal and transverse water-tight design of electrical cables, which has so far mainly gained importance in plastic-insulated communication cables, is increasingly also of concern to the designers and material technicians for plastic-insulated high-voltage and high-voltage cables. It is feared that water that has penetrated into such cables will lead to a deterioration in the insulation properties and possibly even to a breakdown. Trimmings can also be affected.

Um das Eindringen von Feuchtigkeit in die Kunststoffisolierung von Mittel- und Hochspannungskabeln und das axiale Vordringen von Feuchtigkeit in solchen Kabeln zu verhindern, ist es bekannt, zwischen dem mehrdrähtigen Leiter und der Isolierung und/oder zwischen der äußeren Leitschicht und dem aus Drähten oder Bändern aufgebauten Schirm, der einen konzentrischen Leiter darstellt, eine feuchtigkeitsabsorbierende Schicht oder eine Feuchtigkeitssperre anzuordnen und/oder die Hohlräume in aus Drähten aufgebauten Leitern mit einer die Längswasserdichtigkeit und/oder Querwasserdichtigkeit gewährleistenden Masse zu füllen. Bei einem bekannten Mittel-oder Hochspannungskabel sind daher die Drähte des Schirmes in eine leitfähige elastische Masse eingebettet (DE-OS 25 14 891). Weiterhin ist es bekannt, die unter dem Schirm angeordnete Leitschicht mit in Längsrichtung des Kabels verlaufenden Rillen oder Nuten zu versehen und diese Rillen oder Nuten mit einem Dichtungsmaterial auszufüllen, das sich in Gegenwart von Wasser ausdehnt (DE-OS 28 11 526). Zur Abdichtung kunststoffisolierter Fernmeldekabel ist auch die Verwendung eines quellfähigen Bandes bekannt, das aus einem mit quellfähigem Füllstoff gemachten wasserlöslichen Kunststoff besteht und mit dem vordringlich der Spalt zwischen Kabelseele und Kabelmantel abgedichtet wird (DE-OS 21 58 996).In order to prevent the penetration of moisture into the plastic insulation of medium and high-voltage cables and the axial penetration of moisture in such cables, it is known to exist between the multi-wire conductor and the insulation and / or between the outer conductive layer and that made up of wires or strips Screen that represents a concentric conductor, a to arrange a moisture-absorbing layer or a moisture barrier and / or to fill the cavities in conductors constructed from wires with a mass which ensures longitudinal water resistance and / or cross water resistance. In a known medium or high-voltage cable, the wires of the screen are therefore embedded in a conductive elastic mass (DE-OS 25 14 891). Furthermore, it is known to provide the conductive layer arranged under the screen with grooves or grooves running in the longitudinal direction of the cable and to fill these grooves or grooves with a sealing material which expands in the presence of water (DE-OS 28 11 526). For sealing plastic-insulated telecommunications cables, the use of a swellable tape is also known, which consists of a water-soluble plastic made with swellable filler and which is primarily used to seal the gap between the cable core and the cable jacket (DE-OS 21 58 996).

Die Erfindungsieht eine neue Gestaltung eines ein- oder mehradrigenelektrischen Kabels vor, das eine extrudierte Kunststoffisolierung und einen Metall- oder Kunststoffmantel aufweist und bei dem wenigstens ein Leiter aus Metalldrähten oder -bändern aufgebaut und diesem Leiter eine Schicht aus elektrisch leitendem Kunststoff zugeordnet ist. Durch die neue Gestaltung sollen die Längs-und die Querwasserdichtigkeit des Kabels im Bereich des mehrdrähtigen Leiters gewährleistet sein. Gemäß der Erfindungist daher vorgesehen, daß zwischen dem Leiter und der leitenden Kunststoffschicht eine elektrisch leitfähige Metall-, Papier- oder Kunststoffolie angeordnet ist, die ein- oder beidseitig mit einem unter Feuchtigkeitseinwirkung aufquellenden Mittel beschichtet ist.The invention provides a new design of a single or multi-core electrical cable which has extruded plastic insulation and a metal or plastic sheath and in which at least one conductor is constructed from metal wires or strips and a layer of electrically conductive plastic is assigned to this conductor. The new design is intended to ensure the longitudinal and transverse watertightness of the cable in the area of the multi-wire conductor. According to the invention it is therefore provided that an electrically conductive metal, paper or plastic film is arranged between the conductor and the conductive plastic layer, which is coated on one or both sides with a swelling agent under the influence of moisture.

Durch die neue Gestaltung wird die Wasserdichtigkeit des Kabels im Bereich des mehrdrähtigen Leiters gewährleistet. Dies gilt insbesondere für konzentrisch angeordnete Leiter, beispielsweise Schirme von Starkstrom-oder Nachrichtenkabeln, die aus einer Lage runder Metalldrähte oder aus einer Lage von Profildrähten oder auch aus zwei oder mehreren aufgesponnenen Metallbändern bestehen. Durch die Verwendung einer elektrisch leitenden Folie wird dabei der elektrische Kontakt zwischen der Leitschicht des Kabels und dem Leiter sichergestellt. Auch bei einer Beschichtung der elektrisch leitfähigen Folie mit einem isolierenden Quellmittel ist dabei infolge der radialen Druckverhältnisse ein Kontakt zwischen der elektrisch leitenden Folie und dem Leiter gewährleistet.The new design ensures that the cable is watertight in the area of the multi-wire conductor. This applies in particular to concentrically arranged conductors, for example shields of power cables or communication cables, which consist of a layer of round metal wires or a layer of profiled wires or also of two or more spun metal strips. The use of an electrically conductive film ensures the electrical contact between the conductive layer of the cable and the conductor. Even when the electrically conductive film is coated with an insulating swelling agent, contact between the electrically conductive film and the conductor is ensured as a result of the radial pressure conditions.

Das unter Feuchtigkeitseinwirkung aufquellende Mittel, bei dem es sich insbesondere um bekannte Stoffe auf Zellulosebasis wie beispielsweise Methylzellulose oder Äthylzellulose handelt, kann auf die elektrisch leitende Folie beispielsweise elektrostatisch oder mittels eines Haftvermittlers wie beispielsweise Polyvinylacetat aufgebracht sein. Gegebenenfalls kommt auch ein Aufsintern in Betracht. Eine weitere Möglichkeit besteht darin, das Quellmittel bzw. Quellpulver mit einem pastenartigen Trägermaterial zu vermischen und das Gemisch auf die elektrisch leitende Folie aufzubringen. Hierbei kann gegebenenfalls ein elektrisch leitender pastenartiger Träger verwendet werden.The agent swelling under the influence of moisture, which is in particular known cellulose-based substances such as methyl cellulose or ethyl cellulose, can be applied to the electrically conductive film, for example electrostatically or by means of an adhesion promoter such as polyvinyl acetate. Sintering may also be considered. Another possibility is to mix the swelling agent or swelling powder with a paste-like carrier material and to apply the mixture to the electrically conductive film. If necessary, an electrically conductive paste-like carrier can be used here.

Die Beschichtung der elektrisch leitfähigen Folie mit dem unter Feuchtigkeitseinwirkung aufquellenden Mittel kann ein- oder beidseitig vorliegen. Besonders vorteilhaft ist die Verwendung eines Kunststoffvlieses, das mit dem unter Feuchtigkeitseinwirkung aufquellenden Mittel angereichert ist.The coating of the electrically conductive film with the agent swelling under the influence of moisture can be present on one or both sides. The use of a plastic fleece which is enriched with the agent swelling under the action of moisture is particularly advantageous.

Ein Ausführungsbeispiel für das neue Kabel ist in der Figur dargestellt.An embodiment of the new cable is shown in the figure.

Die Figur zeigt ein kunststoffisoliertes Mittelspannungskabel, auf dessen mehrdrähtigen Leiter 1 die Feuchtigkeitssperre 2 aufgebracht ist. Hierbei handelt es sich um ein elektrisch leitendes Kunststoffvlies, das mit einem Quelmittel angereichert ist und das in Bandform auf den Leiter aufgesponnen ist. Über der Sperrschicht 2 befindet sich die extrudierte Polyäthylenisolierung 3 einschließlich einer nicht näher bezeichneten inneren und einer ebenfalls nicht näher bezeichneten äußeren Leitschicht, wie sie bei Mittelspannungskabeln üblich ist. Darüber ist eine weitere Feuchtigkeitssperre 4 angeordnet, die ebenfalls aus einem elektrisch leitenden Kunststoffvlies besteht, das mit einem Quellmittel, insbesondere einem Quellpulver, angereichert ist. Auf die Sperrschicht 4 ist der Schirm 5 aus Kupferdrähten aufgesponnen. Darüber wiederum befindet sich der Außenmantel 6 aus Polyvinylchlorid.The figure shows a plastic-insulated medium-voltage cable, on the multi-wire conductor 1, the moisture barrier 2 is applied. This is an electrically conductive plastic fleece, which is enriched with a swelling agent and which is spun onto the conductor in the form of a tape. The extruded polyethylene insulation 3 is located above the barrier layer 2, including an inner conductive layer and an outer conductive layer, also unspecified, as is customary in medium-voltage cables. A further moisture barrier 4 is arranged above it, which likewise consists of an electrically conductive plastic fleece which is enriched with a swelling agent, in particular a swelling powder. The screen 5 made of copper wires is spun onto the barrier layer 4. The outer jacket 6 made of polyvinyl chloride is located above this.

Claims (2)

1. Ein- oder mehradriges elektrisches Kabel mit extrudierter Kunststoffisolierung und Metall- oder Kunststoffmantel, bei dem wenigstens ein Leiter aus Metalldrähten oder -bändern aufgebaut und diesem Leiter eine Schicht aus elektrisch leitendem Kunststoff zugeordnet ist, dadurch gekennzeichnet , daß zwischen dem Leiter (5) und der leitenden Kunststoffschicht (3) eine elektrisch leitfähige Metall-, Papier-oder Kunststoffolie (4) angeordnet ist, die ein- oder beidseitig mit einem unter Feuchtigkeitseinwirkung aufquellenden Mittel beschichtet ist.1. Single or multi-core electrical cable with extruded plastic insulation and metal or plastic sheath, in which at least one conductor is made up of metal wires or strips and this conductor is assigned a layer of electrically conductive plastic, characterized in that between the conductor (5) and an electrically conductive metal, paper or plastic film (4) is arranged on the conductive plastic layer (3) and is coated on one or both sides with an agent swelling under the influence of moisture. 2. Elektrisches Kabel nach Anspruch 1, dadurch gekennzeichnet , daß die beschichtete Kunststoffolie (4) aus einem mit einem Quellmittel angereicherten Kunststoffvlies besteht.2. Electrical cable according to claim 1, characterized in that the coated plastic film (4) consists of a plastic fleece enriched with a swelling agent.
EP80730045A 1979-07-17 1980-07-03 Electric cable with multi-wire conductor and moisture barrier Expired EP0022745B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80730045T ATE6105T1 (en) 1979-07-17 1980-07-03 ELECTRICAL CABLE WITH STRANDED CONDUCTOR AND MOISTURE BARRIER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7920687U DE7920687U1 (en) 1979-07-17 1979-07-17 Electric cable with stranded conductor and moisture barrier
DE7920687U 1979-07-17

Publications (2)

Publication Number Publication Date
EP0022745A1 true EP0022745A1 (en) 1981-01-21
EP0022745B1 EP0022745B1 (en) 1984-02-01

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ID=6705893

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EP80730045A Expired EP0022745B1 (en) 1979-07-17 1980-07-03 Electric cable with multi-wire conductor and moisture barrier

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EP (1) EP0022745B1 (en)
AT (1) ATE6105T1 (en)
DE (1) DE7920687U1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164198A (en) * 1984-09-05 1986-03-12 Telephone Cables Ltd Cables
EP0269778A1 (en) * 1986-11-21 1988-06-08 Firma Carl Freudenberg Process for manufacturing a swellable cable wrapping
EP0342149A1 (en) * 1988-05-10 1989-11-15 Siemens Aktiengesellschaft Plastic-insulated electric conductor and method of manufacture
EP0391012A1 (en) * 1989-04-07 1990-10-10 Siemens Aktiengesellschaft Extrudable polymer blend for electric cables, and electric cable inner layer containing same
NL9001960A (en) * 1989-09-07 1991-04-02 Felten & Guilleaume Energie Removing traces of moisture from cable - by applying electrochemical mixt. of metal powders in or on material which swells up in water, seals cable, and decomposes water
US5463361A (en) * 1991-11-18 1995-10-31 Motorola, Inc. Surface acoustic wave filter and method
CN104240823A (en) * 2014-09-30 2014-12-24 广东中德电缆有限公司 Compression-resisting and moistureproofing cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344546C1 (en) * 1993-12-24 1995-05-04 Felten & Guilleaume Energie Longitudinally watertight cable with plastic insulation and an outer spiral or annular corrugated metal sheath

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020276A (en) * 1975-04-11 1977-04-26 Scal - Societe De Conditionnements En Aluminum Sealant barrier for electrical cables
DE2605366A1 (en) * 1974-05-06 1977-08-18 Gen Cable Corp High voltage power cable - constructed to avoid the formation of electrochemical trees in the insulation
DE2007163B2 (en) * 1970-02-17 1978-07-27 3000 Hannover Longitudinally watertight electrical cable
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
DE2719094A1 (en) * 1977-04-29 1978-11-09 Kabel Metallwerke Ghh Medium or HV cable with moisture protection - has annular space between insulation and metallic sheathing filled with conductive layer and hard paper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2007163B2 (en) * 1970-02-17 1978-07-27 3000 Hannover Longitudinally watertight electrical cable
DE2605366A1 (en) * 1974-05-06 1977-08-18 Gen Cable Corp High voltage power cable - constructed to avoid the formation of electrochemical trees in the insulation
US4020276A (en) * 1975-04-11 1977-04-26 Scal - Societe De Conditionnements En Aluminum Sealant barrier for electrical cables
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
DE2719094A1 (en) * 1977-04-29 1978-11-09 Kabel Metallwerke Ghh Medium or HV cable with moisture protection - has annular space between insulation and metallic sheathing filled with conductive layer and hard paper

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164198A (en) * 1984-09-05 1986-03-12 Telephone Cables Ltd Cables
EP0269778A1 (en) * 1986-11-21 1988-06-08 Firma Carl Freudenberg Process for manufacturing a swellable cable wrapping
EP0342149A1 (en) * 1988-05-10 1989-11-15 Siemens Aktiengesellschaft Plastic-insulated electric conductor and method of manufacture
EP0391012A1 (en) * 1989-04-07 1990-10-10 Siemens Aktiengesellschaft Extrudable polymer blend for electric cables, and electric cable inner layer containing same
NL9001960A (en) * 1989-09-07 1991-04-02 Felten & Guilleaume Energie Removing traces of moisture from cable - by applying electrochemical mixt. of metal powders in or on material which swells up in water, seals cable, and decomposes water
US5463361A (en) * 1991-11-18 1995-10-31 Motorola, Inc. Surface acoustic wave filter and method
CN104240823A (en) * 2014-09-30 2014-12-24 广东中德电缆有限公司 Compression-resisting and moistureproofing cable

Also Published As

Publication number Publication date
ATE6105T1 (en) 1984-02-15
EP0022745B1 (en) 1984-02-01
DE7920687U1 (en) 1979-10-18

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