US2536904A - Cable with air insulation - Google Patents

Cable with air insulation Download PDF

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Publication number
US2536904A
US2536904A US678780A US67878046A US2536904A US 2536904 A US2536904 A US 2536904A US 678780 A US678780 A US 678780A US 67878046 A US67878046 A US 67878046A US 2536904 A US2536904 A US 2536904A
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US
United States
Prior art keywords
sheath
cable
cables
insulation
air
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 - Lifetime
Application number
US678780A
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English (en)
Inventor
Beuckens Jacobus
Mol Evert Arij Jan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2536904A publication Critical patent/US2536904A/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
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H01B11/1847—Construction of the insulation between the conductors of helical wrapped structure

Definitions

  • the invention relates to cables wherein in connection with their use low dielectric losses and, in addition, a slight mutual capacity between the conductors present therein or a slight capacity between these conductors and an external conductive envelope is desired, such as cables for carrier-wave telephony, for television, for aerials and other purposes.
  • air-insulated cables of satisfactory flexibility, even at low temperatures may be obtained by utilizing helically wound threads or ribbons consisting of polyvinylchloride or similar polymerides containing chlorine, such as chlorinated polyvinylchloride and mixed polymerisates on the basis of polyvinylchloride, which contain a softener in so low a percentage that the dielectric losses are lower than about 100 10- measured at a wavelength of from 50 to 200 meters at room temperature.
  • the softeners commonly utilized with the said insulating materia's such as tricresylphosphate, chlorinated diphenyl, dibutylphthalate and the like enter into account for carrying the invention into effect.
  • the thread or ribbon may be utilized either solid or hollow or properly profiled and, if de-- sired, provided with inlaid portions either conductive or not.
  • the insulation according to the invention is to a high extent resistant to compressive strain and insensitive to moisture.
  • the invention is based on the recognition that by utilizing a suitable percentage of the softener it is possible to obtain in a simple manner the said combination of favourable properties.
  • the required percentage of the softener is slightly dependent upon the nature of the polymerisate and of the softener utilized therewith.
  • the upper limit thereof is determined by the requirement about the dielectric losses and the lower limit by the required flexibility, a content of at least about 10% being generally required therefor.
  • the insulation should be non-inflammable and resistant against the effect of light and atmospheric influences.
  • a further advantage is that the insulation is substantially not attacked by aliphatic hydro-carbides, which is important for example in the use as a cable for a motorcar aerial.
  • the insulation according to the invention may be utilized in bare conductors as .well as in con ductors already provided with an insulating layer while the conductors may be located therein so as to be entirely free or may be locally supported.
  • the heically wound insulation is preferably surrounded by a flexible insulating sheath, for example in the form of foil, which may be surrounded by an external conductive layer which acts as an electric screen, for example by a metal covering or a conductive layer of varnish, which, if desired, may be surrounded in its turn, for ex ample, by a cotton covering.
  • l denotes a copper wire having a. diameter of 0.25 mm., which wire is located freely within a helically wound thread 2 with a thickness of 1.2 mm. which consists of polyvinylchloride which has been plastifled with 15% of diphenylchloride, the thread of polyvinylchloride being wound during this operation on a mandrel of 5 mms. with a pitch of 4 mms. Then there has been provieddd a covering of polyvinylchloride foil 3 which is surrounded successively by a metal covering 4, which acts as a screen, and by a cotton covering 5.
  • An air-insulated flexible cable comprising a tubular flexible insulating sheath, a conductor *element freely disposed within said sheath, and
  • insulating material within said sheath, said insulating material comprising a chlorinated polymeride and between apbient temperature.
  • An air-insulated flexible cable comprising a tubular flexible insulating sheath, a conductor element freely disposed within said sheath, and a helically wound ribbon of insulating material within said sheath, said insulating material comprising polyvinyl chloride and about 15% of diphenyl hloride, said insulating material having dielectr e losses less than about 100 1O at wavelengths between'50 and 200 meters measured at the ambient temperature.
  • An air-insulated flexible cable comprising a tubular flexible insulating sheath, a conductive layer on the outer surface of said tubular sheath, a conductor element freely disposed within said sheath, and a helically wound ribbon of insulating material within said sheath.
  • said insulatin material comprising a chlorinated polymeride and a plasticizer in an amount between 10 and 15% of the insulating material, said insulating material having dielectric losses less than about 100x10- at wavelengths between 50 and 206 meters measured at the ambient temperature.

Landscapes

  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
US678780A 1942-01-23 1946-06-24 Cable with air insulation Expired - Lifetime US2536904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL242709X 1942-01-23

Publications (1)

Publication Number Publication Date
US2536904A true US2536904A (en) 1951-01-02

Family

ID=19780659

Family Applications (1)

Application Number Title Priority Date Filing Date
US678780A Expired - Lifetime US2536904A (en) 1942-01-23 1946-06-24 Cable with air insulation

Country Status (6)

Country Link
US (1) US2536904A (enrdf_load_stackoverflow)
BE (1) BE448868A (enrdf_load_stackoverflow)
CH (1) CH242709A (enrdf_load_stackoverflow)
DE (1) DE894862C (enrdf_load_stackoverflow)
FR (1) FR890294A (enrdf_load_stackoverflow)
GB (1) GB654047A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171868A (en) * 1976-06-08 1979-10-23 The Post Office Optical fiber cable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE906014C (de) * 1950-12-17 1954-03-08 Richard Rosendahl Verfahren zur Herstellung von Kunstharzdispersionen mit erhoehten Festigkeits- und Waermeeigenschaften der Festanteile
US20080190026A1 (en) 2006-12-01 2008-08-14 De Jong Johannes Cornelis Process to prepare a mixture of hydrogen and carbon monoxide from a liquid hydrocarbon feedstock containing a certain amount of ash

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1990903A (en) * 1932-12-27 1935-02-12 Carbide & Carbon Chem Corp Denture
US2115214A (en) * 1936-07-30 1938-04-26 Ault & Wiborg Corp Coating composition
US2116643A (en) * 1932-02-15 1938-05-10 Rost Helge Electric cable
US2160904A (en) * 1937-10-12 1939-06-06 Dow Chemical Co Plastic derivatives of vinylidene chloride
US2193613A (en) * 1937-03-18 1940-03-12 Goodrich Co B F Polyvinyl halide compositions
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
US2252486A (en) * 1941-08-12 Coating composition and the like-
US2395872A (en) * 1943-05-22 1946-03-05 Hans D Isenberg Air-space insulated conductor

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252486A (en) * 1941-08-12 Coating composition and the like-
US2116643A (en) * 1932-02-15 1938-05-10 Rost Helge Electric cable
US1990903A (en) * 1932-12-27 1935-02-12 Carbide & Carbon Chem Corp Denture
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
US2115214A (en) * 1936-07-30 1938-04-26 Ault & Wiborg Corp Coating composition
US2193613A (en) * 1937-03-18 1940-03-12 Goodrich Co B F Polyvinyl halide compositions
US2160904A (en) * 1937-10-12 1939-06-06 Dow Chemical Co Plastic derivatives of vinylidene chloride
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
US2395872A (en) * 1943-05-22 1946-03-05 Hans D Isenberg Air-space insulated conductor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171868A (en) * 1976-06-08 1979-10-23 The Post Office Optical fiber cable

Also Published As

Publication number Publication date
CH242709A (de) 1946-05-31
DE894862C (de) 1953-10-29
GB654047A (en) 1951-06-06
BE448868A (enrdf_load_stackoverflow) 1943-02-27
FR890294A (fr) 1944-02-03

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