EP0022745A1 - Electric cable with multi-wire conductor and moisture barrier - Google Patents
Electric cable with multi-wire conductor and moisture barrier Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- plastic
- layer
- metal
- electrically conductive
- 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
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 20
- 230000004888 barrier function Effects 0.000 title description 6
- 239000004033 plastic Substances 0.000 claims abstract description 16
- 229920003023 plastic Polymers 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000003000 extruded plastic Substances 0.000 claims abstract description 3
- 230000008961 swelling Effects 0.000 claims description 12
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 239000000123 paper Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000035515 penetration Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000010944 ethyl methyl cellulose Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229920003087 methylethyl cellulose Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Images
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 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.
Landscapes
- Insulated Conductors (AREA)
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 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
Claims (2)
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 true EP0022745A1 (en) | 1981-01-21 |
| EP0022745B1 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) |
Cited By (7)
| 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)
| 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)
| 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 |
-
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
Patent Citations (5)
| 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)
| 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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