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 PDFInfo
- 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
Links
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8803126 | 1988-09-06 | ||
SE8803126A SE468871B (en) | 1988-09-06 | 1988-09-06 | SMALL COMMUNICATION CABLE INTENDED FOR FREQUENCY UP TO AND WITH THE MHZ AREA |
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)
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)
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 |
-
1988
- 1988-09-06 SE SE8803126A patent/SE468871B/en not_active IP Right Cessation
-
1989
- 1989-08-24 NO NO893402A patent/NO176458C/en unknown
- 1989-08-24 AU AU40152/89A patent/AU620131B2/en not_active Ceased
- 1989-09-01 FI FI894129A patent/FI95419C/en not_active IP Right Cessation
- 1989-09-05 DK DK437789A patent/DK169932B1/en not_active IP Right Cessation
- 1989-10-09 EP EP89402777A patent/EP0422306B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU620131B2 (en) | 1992-02-13 |
FI95419B (en) | 1995-10-13 |
NO893402D0 (en) | 1989-08-24 |
EP0422306B1 (en) | 1995-11-22 |
DK437789D0 (en) | 1989-09-05 |
NO176458B (en) | 1994-12-27 |
FI95419C (en) | 1996-01-25 |
FI894129A0 (en) | 1989-09-01 |
SE8803126L (en) | 1990-03-07 |
SE8803126D0 (en) | 1988-09-06 |
AU4015289A (en) | 1990-03-15 |
FI894129A (en) | 1990-03-07 |
DK437789A (en) | 1990-03-07 |
NO176458C (en) | 1995-04-05 |
NO893402L (en) | 1990-03-07 |
EP0422306A1 (en) | 1991-04-17 |
SE468871B (en) | 1993-03-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
B1 | Patent granted (law 1993) | ||
PBP | Patent lapsed |