DK169932B1 - Thin communication cable which is insensitive to moisture in the electrical sense - Google Patents

Thin communication cable which is insensitive to moisture in the electrical sense Download PDF

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Publication number
DK169932B1
DK169932B1 DK437789A DK437789A DK169932B1 DK 169932 B1 DK169932 B1 DK 169932B1 DK 437789 A DK437789 A DK 437789A DK 437789 A DK437789 A DK 437789A DK 169932 B1 DK169932 B1 DK 169932B1
Authority
DK
Denmark
Prior art keywords
moisture
layers
layer
communication cable
cable
Prior art date
Application number
DK437789A
Other languages
Danish (da)
Other versions
DK437789A (en
DK437789D0 (en
Inventor
Kjell Eldensjoe
Joergen Persson
Original Assignee
Alcatel Iko Kabel Ab
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 Alcatel Iko Kabel Ab filed Critical Alcatel Iko Kabel Ab
Publication of DK437789D0 publication Critical patent/DK437789D0/en
Publication of DK437789A publication Critical patent/DK437789A/en
Application granted granted Critical
Publication of DK169932B1 publication Critical patent/DK169932B1/en

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1058—Screens specially adapted for reducing interference from external sources using a coating, e.g. a loaded polymer, ink or print
    • H01B11/1066—Screens specially adapted for reducing interference from external sources using a coating, e.g. a loaded polymer, ink or print the coating containing conductive or semiconductive material
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/187—Sheaths comprising extruded non-metallic layers

Description

i DK 169932 B1in DK 169932 B1

Opfindelsen angår et tyndt kommunikationskabel, som er ikke-følsomt over for fugt i elektrisk henseende. Et kommunikationskabel er specielt beregnet til anvendelse ved frekvenser op til og med MHz-området. Kablet er for-5 synet med mindst to elektriske ledere og en omsluttende kappe.The invention relates to a thin communication cable which is non-sensitive to moisture in the electrical sense. A communication cable is specially designed for use at frequencies up to and including the MHz range. The cable is provided with at least two electrical conductors and an enclosing sheath.

Det har vist sig, at et konventionelt feltkabel kan få en elektrisk liniedæmpningsforøgelse på mere end 100 % ved 10 eksempelvis dugregn ved frekvensen 1,024 MHz, som ligger betydelig over de tidligere anvendte frekvenser. Formålet med opfindelsen er derfor i første række at opnå et kommunikationskabel, hvis elektriske liniedæmpning holder et lavt og jævnt niveau, selv når kablet udsættes for væde 15 eller et varierende ydre miljø med hensyn til vejrligsforholdene ved en anvendelse ved en og samme frekvens. Dette opnås i forbindelse med et tyndt kommunikationskabel af den indledningsvis angivne art i første række ved, at kappen er sammensat af tre, indbyrdes sammenføjede lag 20 - et inderlag, et yderlag og et mellemlag - og ved at mellemlaget består af et halvledende materiale. Nævnte elektriske liniedæmpning kan være af størrelsesordenen ^ 14 dB/km ved 1,024 MHz. Det angivne formål opnås således med et kommunikationskabel som angivet i den indledende 25 del af krav 1 og som ifølge opfindelsen er karakteristisk ved den i samme kravs kendetegnende del angivne udformning.It has been found that a conventional field cable can have an electric line attenuation increase of more than 100% at, for example, dew rows at the frequency of 1.024 MHz, which is considerably above the frequencies previously used. The object of the invention is therefore primarily to obtain a communication cable whose electric line attenuation maintains a low and even level, even when the cable is exposed to moisture 15 or a varying external environment with respect to the weather conditions when used at the same frequency. This is achieved in connection with a thin communication cable of the type indicated initially, in that the casing is composed of three, interconnected layers 20 - an inner layer, an outer layer and an intermediate layer - and by the intermediate layer consisting of a semiconducting material. Said electric line attenuation may be of the order of ^ 14 dB / km at 1,024 MHz. The stated object is thus achieved with a communication cable as defined in the preamble part of claim 1 and which according to the invention is characteristic of the design according to the characterizing part of the same claim.

Opfindelsen skal i det følgende nærmere beskrives med 30 henvisning til tegningen, som viser et snit gennem et kommunikationskabel ifølge opfindelsen.The invention will now be described in more detail with reference to the drawing, which shows a section through a communication cable according to the invention.

Kommunikationskablet 10 i fig. 1 er et såkaldt totrådskabel, men opfindelsen kan naturligvis også anvendes på 35 kabler med to eller flere par tråde. Kommunikationskablet omfatter to ens separate elektriske ledninger 12, som hver består af en polyethenisoleret 14, fortinnet kobber- i 2 DK 169932 B1 tråd. Endvidere omfatter kablet også to trækaflastningselementer 16, som i det foreliggende tilfælde hvert består af en polyethenisoleret 18 rustfri stålwire. De to isolerede ledere 12 og de to isolerede stålwirer 16 er på 5 i og for sig kendt måde snoet til en kompakt firskruning.The communication cable 10 in FIG. 1 is a so-called two-wire cable, but the invention can of course also be applied to 35 cables with two or more pairs of wires. The communication cable comprises two identical separate electrical wires 12, each consisting of a polyethylene insulated 14, tinned copper wire. Furthermore, the cable also comprises two tensile relief members 16, each of which in the present case consists of a polyethylene insulated 18 stainless steel wire. The two insulated conductors 12 and the two insulated steel wires 16 are twisted in a manner known per se to a compact four-screw.

Trådene 16 og lederne 12 er omsluttet af en kappe 20, 22, 24, som er blevet ekstruderet udfyldende omkring hele firskruningen.The wires 16 and the conductors 12 are enclosed by a sheath 20, 22, 24 which has been extruded extensively around the entire four screws.

10 Som det fremgår af tegningen er kappen sammensat af tre forskellige, indbyrdes sammenføjede lag. Lagene består af plast, fortrinsvis polyethen. Det indre lag 20 og det ydre lag 22 er uledende, mens mellemlaget 24 er halvledende .10 As can be seen from the drawing, the sheath is composed of three different, interconnected layers. The layers are made of plastic, preferably polyethylene. The inner layer 20 and outer layer 22 are non-conductive, while the intermediate layer 24 is semiconducting.

1515

Sammeføjningen er opnået ved sammensmeltning af de tre lag i et enkelt moment, men man kan naturligvis også tænke sig anvendelse af lim eller en anden sammenføjnings-metode.The jointing is achieved by the fusion of the three layers in a single torque, but it is of course also possible to use glue or another joining method.

2020

Inderlaget 20 af polyethen kan have en lav densitet, mens det ydre lag 22 skal bestå af slidstærkt polyethen med høj densitet eller anden slidstærk plast f.eks. polyamid.The inner layer 20 of polyethylene may have a low density, while the outer layer 22 must consist of durable high density polyethylene or other durable plastic e.g. polyamide.

Mellemlaget 24 bør have en for liniedæmpningsniveau pas- 25 sende volumenresistivitet, fortrinsvis af størrelsesorde-2 nen 10 Q cm, ved en temperatur på 20 °C. For det tilsigtede formål er det passende, at inderlaget 20 er mellem fire og seks gange tykkere end mellemlaget 24.The intermediate layer 24 should have a volume resistance suitable for line damping level, preferably of the order of 10 Q cm, at a temperature of 20 ° C. For this purpose, it is convenient that the inner layer 20 is between four and six times thicker than the intermediate layer 24.

30 Det bør bemærkes, at kappen totalt set skal være forholdsvis tynd, for det som eksempel viste totrådskabel ca. 0,6 mm, hvorved mellemlaget 24 bør have en tykkelse £ 0,10 mm.30 It should be noted that overall the sheath must be relatively thin, for the example two-wire cable shown approx. 0.6 mm, whereby the intermediate layer 24 should have a thickness of £ 0.10 mm.

35 Et kommunikationskabel af den ovenfor angivne art, som har en yderdiameter, som nominelt går op til 4,7 mm, ^ giver ved frekvensen 1,024 MHz en liniedæmpning på 9 3 DK 169932 B1 12,8 τ 0,5 dB/km ved temperaturen 20 °C uanset de øvrige ydre vejrligsforhold.35 A communication cable of the above type having an outer diameter nominally up to 4.7 mm ^ at the frequency of 1.024 MHz gives a line attenuation of 9 3 DK 169932 B1 12.8 τ 0.5 dB / km at the temperature 20 ° C regardless of the other external weather conditions.

5 10 15 20 25 30 355 10 15 20 25 30 35

Claims (4)

1. Tyndt kommunikationskabel (10) til anvendelse ved fre-5 kvenser op til og med MHz-området, hvilket kommunikationskabel i elektrisk henseende er ufølsomt over for fugt og har en lille diameter, samt er forsynet med mindst to elektriske ledere (12), samt en kappe, der omslutter disse, og består af tre lag - et inderlag (20) et 10 yderlag (22) og et mellemlag (24), hvilken kappe bibringer den nævnte fugt-uf ølsomhed, kendetegnet ved, at de tre lag (20, 22, 24) er indbyrdes fast sammenføjede, at inderlaget (20) består af plast, fortrinsvis polyethen, med lav densitet, at yderlaget (22) består af 15 plast, fortrinsvis polyethen, med høj densitet, eller polyamid, at mellemlaget (24) består af et halvledende plastmateriale, fortrinsvis polyethen, med en volumenre- 2 sistivitet af størrelsesordenen 10 Ω cm, samt at inderlaget (20) er mellem 4 og 6 gange tykkere end mellemlaget 20 (24).A thin communication cable (10) for use at frequencies up to and including the MHz range, said electrical cable being insensitive to moisture and having a small diameter, and having at least two electrical conductors (12), and a sheath enclosing these, consisting of three layers - an inner layer (20), an outer layer (22) and an intermediate layer (24), the sheath imparting said moisture-insensitivity, characterized in that the three layers ( 20, 22, 24) are mutually joined together that the inner layer (20) consists of plastic, preferably low density polyethylene, that the outer layer (22) consists of 15 plastic, preferably high density polyethylene, or polyamide, that the intermediate layer ( 24) consists of a semiconducting plastic material, preferably polyethylene, with a volume resistivity of the order of 10 Ω cm, and that the inner layer (20) is between 4 and 6 times thicker than the intermediate layer 20 (24). 2. Kabel ifølge krav 1, kendetegnet ved, at de tre lag (20, 22, 24) gennem ekstrudering er sammensmeltet i et enkelt trin. 25Cable according to claim 1, characterized in that the three layers (20, 22, 24) are fused in a single step through extrusion. 25 3. Kabel ifølge krav 1 eller 2, kendetegnet ved, at såvel inder- som yderlaget (20 respektiv 22) består af isolerende materiale. 30Cable according to claim 1 or 2, characterized in that both the inner and outer layers (20 and 22, respectively) consist of insulating material. 30 4. Kabel ifølge ethvert af kravene 1-3, kendeteg net ved, at yderlaget (22) består af en slidbestandig plast. 35 i 4Cable according to any one of claims 1-3, characterized in that the outer layer (22) consists of a wear-resistant plastic. 35 in 4
DK437789A 1988-09-06 1989-09-05 Thin communication cable which is insensitive to moisture in the electrical sense DK169932B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8803126A SE468871B (en) 1988-09-06 1988-09-06 SMALL COMMUNICATION CABLE INTENDED FOR FREQUENCY UP TO AND WITH THE MHZ AREA
SE8803126 1988-09-06

Publications (3)

Publication Number Publication Date
DK437789D0 DK437789D0 (en) 1989-09-05
DK437789A DK437789A (en) 1990-03-07
DK169932B1 true DK169932B1 (en) 1995-04-03

Family

ID=20373236

Family Applications (1)

Application Number Title Priority Date Filing Date
DK437789A DK169932B1 (en) 1988-09-06 1989-09-05 Thin communication cable which is insensitive to moisture in the electrical sense

Country Status (6)

Country Link
EP (1) EP0422306B1 (en)
AU (1) AU620131B2 (en)
DK (1) DK169932B1 (en)
FI (1) FI95419C (en)
NO (1) NO176458C (en)
SE (1) SE468871B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2712115A1 (en) * 1993-11-05 1995-05-12 Filotex Sa Screened cable, having a low level of noise and a high service temperature
AU5191801A (en) 2001-06-14 2002-12-19 Pirelli Cables Australia Limited Communications cable provided with a crosstalk barrier for use at high transmission frequencies

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668298A (en) * 1969-12-10 1972-06-06 Bell Telephone Labor Inc Multiconductor communications cable
NO140249C (en) * 1977-04-28 1979-07-25 Elektrisitetsforsyning STRONG CURRENT CABLE WHICH IS RESISTANT TO THE FORMATION OF WATER TREES IN THE INSULATION AND PROCEDURE FOR THE MANUFACTURE OF SUCH CABLE
US4486252A (en) * 1980-10-08 1984-12-04 Raychem Corporation Method for making a low noise cable
GB8704938D0 (en) * 1987-03-03 1987-04-08 Bp Chem Int Ltd Cables

Also Published As

Publication number Publication date
FI95419B (en) 1995-10-13
NO176458B (en) 1994-12-27
EP0422306A1 (en) 1991-04-17
FI95419C (en) 1996-01-25
SE8803126L (en) 1990-03-07
DK437789A (en) 1990-03-07
FI894129A0 (en) 1989-09-01
NO893402L (en) 1990-03-07
SE468871B (en) 1993-03-29
SE8803126D0 (en) 1988-09-06
AU620131B2 (en) 1992-02-13
FI894129A (en) 1990-03-07
EP0422306B1 (en) 1995-11-22
DK437789D0 (en) 1989-09-05
NO893402D0 (en) 1989-08-24
NO176458C (en) 1995-04-05
AU4015289A (en) 1990-03-15

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Legal Events

Date Code Title Description
B1 Patent granted (law 1993)
PBP Patent lapsed