EP0022745B1 - Electric cable with multi-wire conductor and moisture barrier - Google Patents
Electric cable with multi-wire conductor and moisture barrier Download PDFInfo
- Publication number
- EP0022745B1 EP0022745B1 EP80730045A EP80730045A EP0022745B1 EP 0022745 B1 EP0022745 B1 EP 0022745B1 EP 80730045 A EP80730045 A EP 80730045A EP 80730045 A EP80730045 A EP 80730045A EP 0022745 B1 EP0022745 B1 EP 0022745B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- spun
- conductive
- plastics
- electric 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.)
- Expired
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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
Definitions
- a swellable tape which consists of a water-soluble plastic mixed with swellable filler and which is primarily used to seal the gap between the cable core and the cable sheath (DE-A-2 158 996).
- the invention provides a new design of a single or multi-core electrical cable which has an extruded plastic insulation and a metal or plastic sheath and in which at least one conductor is constructed from stranded or spun metal wires or from spun metal strips and this conductor has a layer of electrically conductive Plastic is assigned.
- 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 plastic fleece is arranged between the conductor and the conductive plastic layer, which is enriched with an agent swelling under the influence of moisture.
- the new design provides a sufficient amount of swelling agent, so that the waterproofness of the cable is ensured in the area of the multi-wire conductor.
- the use of an electrically conductive fleece ensures the electrical contact between the conductive layer of the cable and the conductor. Even when the electrically conductive fleece is enriched with an insulating swelling agent, contact between the electrically conductive fleece and the conductor is ensured due to the radial pressure conditions.
- the agent swelling under the action of moisture is a known cellulose-based substance, such as methyl cellulose or ethyl cellulose.
- 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 tape form.
- Above the moisture keitss erre p 2 is the extruded Polyäthyienisoltechnik 3 including an inner unspecified and a likewise unspecified outer conducting layer, as is usual 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 is spun from copper wires onto the moisture barrier 4.
- the outer jacket 6 made of polyvinyl chloride is located above this.
Abstract
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 watertight design of electrical cables, which has previously gained importance mainly in the case of 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-A1-2514891). 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-A1-2811 526). Zur Abdichtung kunststoffisolierter Fernmeldekabel ist auch die Verwendung eines quellfähigen Bandes bekannt, das aus einem mit quellfähigem Füllstoff gemischten wasserlöslichen Kunststoff besteht und mit dem vordringlich der Spalt zwischen Kabelseele und Kabelmantel abgedichtet wird (DE-A-2 158 996). Für kunststoffisolierte, mit einem geschlossenen Schirm versehene Starkstromkabel ist es weiterhin bekannt, zwischen der äußeren Leitschicht und dem Schirm ein Polster aus elektrisch leitender Wellpappe anzuordnen, deren Wellentäler und Wellenberge mit Quellmittel gefüllt sind (DE-AL -2 719 094). Die damit zusätzlich erzielte Längsabdichtung zwischen Leitschicht und Schirm wird bei einem anderen bekannten Kabel mit einem Quellmittel erreicht, das sich auf einem bandförmigen Träger wie Kabelpapier, Papiervlies oder Kunststoffvlies befindet (DE-B2-2007 163). Auch ist es bekannt, den geschlossenen Schirm auf der Innenseite mit einem elektrisch leitenden Polymer-Compound zu beschichten (US-A4 020 276).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 composed of wires or strips Screen, which is a concentric conductor, to arrange a moisture-absorbing layer or a moisture barrier and / or to fill the cavities in conductors constructed from wires with a compound 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-A1-2514891). 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-A1-2811 526). For sealing plastic-insulated telecommunications cables, the use of a swellable tape is also known, which consists of a water-soluble plastic mixed with swellable filler and which is primarily used to seal the gap between the cable core and the cable sheath (DE-A-2 158 996). For plastic-insulated power cables with a closed screen, it is also known to arrange a pad made of electrically conductive corrugated cardboard between the outer conductive layer and the screen, the troughs and peaks of which are filled with swelling agent (DE-AL -2 719 094). The additional longitudinal seal thus achieved between the conductive layer and the screen is achieved with another known cable with a swelling agent which is located on a tape-like carrier such as cable paper, paper fleece or plastic fleece (DE-B2-2007 163). It is also known to coat the closed screen on the inside with an electrically conductive polymer compound (US-A4 020 276).
Die Erfindung sieht eine neue Gestaltung eines ein- oder mehradrigen elektrischen Kabels vor, das eine extrudierte Kunststoffisolierung und einen Metall- oder Kunststoffmantel aufweist und bei dem wenigstens ein Leiter aus verseilten oder aufgesponnenen Metalldrähten oder aus aufgesponnenen Metallbändern 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 Erfindung ist daher vorgesehen, daß zwischen dem Leiter und der leitenden Kunststoffschicht ein elektrisch leitfähiges Kunststoffvlies angeordnet ist, das mit einem unter Feuchtigkeitseinwirkung aufquellenden Mittel angereichert ist.The invention provides a new design of a single or multi-core electrical cable which has an extruded plastic insulation and a metal or plastic sheath and in which at least one conductor is constructed from stranded or spun metal wires or from spun metal strips and this conductor has a layer of electrically conductive Plastic is assigned. 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 plastic fleece is arranged between the conductor and the conductive plastic layer, which is enriched with an agent swelling under the influence of moisture.
Durch die neue Gestaltung wird eine ausreichende Menge an Quellmittel bereitgestellt, so daß die Wasserdichtigkeit des Kabels im Bereich des mehrdrähtigen Leiters gewährleistet ist. 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 eines elektrisch leitenden Vlieses wird dabei der elektrische Kontakt zwischen der Leitschicht des Kabels und dem Leiter sichergestellt. Auch bei einer Anreicherung des elektrisch leitfähigen Vlieses mit einem isolierenden Quellmittel ist dabei infolge der radialen Druckverhältnisse ein Kontakt zwischen dem elektrisch leitenden Vlies und dem Leiter gewährleistet.The new design provides a sufficient amount of swelling agent, so that the waterproofness of the cable is ensured 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 profile wires or also of two or more spun metal strips. The use of an electrically conductive fleece ensures the electrical contact between the conductive layer of the cable and the conductor. Even when the electrically conductive fleece is enriched with an insulating swelling agent, contact between the electrically conductive fleece and the conductor is ensured due to the radial pressure conditions.
. Bei dem unter Feuchtigkeitseinwirkung aufquellenden Mittel handelt es sich um bekannte Stoffe auf Zellulosebasis, wie beispielsweise Methylzellulose oder Äthylzellulose.. The agent swelling under the action of moisture is a known cellulose-based substance, such as methyl cellulose or ethyl cellulose.
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 kunststoffisoiiertes Mittelspannungskabel, auf dessen mehrdrähtigen Leiter 1 die Feuchtigkeitssperre 2 aufgebracht ist. Hierbei handelt es sich um ein elektrisch leitendes Kunststoffvlies, das mit einem Quellmittel angereichert ist und das in Bandform auf den Leiter aufgesponnen ist. Über der Feuchtig- keitssperre 2 befindet sich die extrudierte Polyäthyienisolierung 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 Feuchtigkeitssperre 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
Claims (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.
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 | 1979-07-17 | ||
| DE7920687U DE7920687U1 (en) | 1979-07-17 | 1979-07-17 | Electric cable with stranded conductor and moisture barrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0022745A1 EP0022745A1 (en) | 1981-01-21 |
| EP0022745B1 true EP0022745B1 (en) | 1984-02-01 |
Family
ID=6705893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80730045A Expired EP0022745B1 (en) | 1979-07-17 | 1980-07-03 | Electric cable with multi-wire conductor and moisture barrier |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0022745B1 (en) |
| AT (1) | ATE6105T1 (en) |
| DE (1) | DE7920687U1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8422458D0 (en) * | 1984-09-05 | 1984-10-10 | Telephone Cables Ltd | Cables |
| DE3639895C1 (en) * | 1986-11-21 | 1988-03-24 | Freudenberg Carl Fa | Swellable cable bandage and process for its manufacture |
| DE3816496A1 (en) * | 1988-05-10 | 1989-11-23 | Bergmann Kabelwerke Ag | PLASTIC-INSULATED ELECTRIC LADDER |
| DE58907954D1 (en) * | 1989-04-07 | 1994-07-28 | Siemens Ag | Extrudable polymer-based mixture for electrical cables and electrical cables with an inner jacket made of this mixture. |
| 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 |
| US5309126A (en) * | 1991-11-18 | 1994-05-03 | Motorola, Inc. | Spatially varying multiple electrode acoustic wave filter and method therefor |
| 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 |
| CN104240823A (en) * | 2014-09-30 | 2014-12-24 | 广东中德电缆有限公司 | Compression-resisting and moistureproofing cable |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2007163B2 (en) * | 1970-02-17 | 1978-07-27 | 3000 Hannover | Longitudinally watertight electrical cable |
| US3943271A (en) * | 1974-05-06 | 1976-03-09 | General Cable Corporation | Extruded solid dielectric high voltage cable resistant to electro-chemical trees |
| SE7602697L (en) * | 1975-04-11 | 1976-10-12 | Scal Gp Condit Aluminium | LONG-TERM SEAL LOCK FOR CABLES FOR TRANSMISSION OF ELECTRIC ENERGY |
| 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 |
-
1979
- 1979-07-17 DE DE7920687U patent/DE7920687U1/en not_active Expired
-
1980
- 1980-07-03 EP EP80730045A patent/EP0022745B1/en not_active Expired
- 1980-07-03 AT AT80730045T patent/ATE6105T1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| ATE6105T1 (en) | 1984-02-15 |
| EP0022745A1 (en) | 1981-01-21 |
| DE7920687U1 (en) | 1979-10-18 |
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