GB1142612A - Improvements in or relating to electric cables - Google Patents

Improvements in or relating to electric cables

Info

Publication number
GB1142612A
GB1142612A GB1747865A GB1747865A GB1142612A GB 1142612 A GB1142612 A GB 1142612A GB 1747865 A GB1747865 A GB 1747865A GB 1747865 A GB1747865 A GB 1747865A GB 1142612 A GB1142612 A GB 1142612A
Authority
GB
United Kingdom
Prior art keywords
cable
permittivity
temperatures
change
gaseous phase
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
Application number
GB1747865A
Inventor
Reginald John Jordan
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.)
Pirelli General Cable Works Ltd
Pirelli General Cable Works
Original Assignee
Pirelli General Cable Works Ltd
Pirelli General Cable Works
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
Priority to FR1471825D priority Critical patent/FR1471825A/fr
Application filed by Pirelli General Cable Works Ltd, Pirelli General Cable Works filed Critical Pirelli General Cable Works Ltd
Priority to GB1747865A priority patent/GB1142612A/en
Priority to BR17894666A priority patent/BR6678946D0/en
Priority to NL6605513A priority patent/NL6605513A/xx
Priority to BE680105D priority patent/BE680105A/xx
Publication of GB1142612A publication Critical patent/GB1142612A/en
Expired legal-status Critical Current

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
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks

Landscapes

  • Locating Faults (AREA)

Abstract

1,142,612. Cable insulation. PIRELLI GENERAL CABLE WORKS Ltd. 9 March, 1966 [26 April, 1965], No. 17478/65. Heading H1A. To locate areas of overheating in a cable there is provided throughout the length of the cable a coaxial pair system which includes an insulating spacing medium which is in a first non- gaseous phase at normal cable temperatures and is in a second gaseous phase at higher abnormal cable temperatures, at which higher abnormal temperatures a significant change in the permittivity of the insulating medium is exhibited. The hot spot in the cable where this change in permittivity has occurred may be located by high frequency pulse fault locating techniques. In an example given the insulating medium is carbon tetrachloride which boils at 77‹ C. and exhibits considerable change in permittivity due to the transition from liquid to vapour phase.
GB1747865A 1965-04-26 1965-04-26 Improvements in or relating to electric cables Expired GB1142612A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR1471825D FR1471825A (en) 1965-04-26
GB1747865A GB1142612A (en) 1965-04-26 1965-04-26 Improvements in or relating to electric cables
BR17894666A BR6678946D0 (en) 1965-04-26 1966-04-25 IMPROVEMENTS IN ELECTRIC CABLES
NL6605513A NL6605513A (en) 1965-04-26 1966-04-25
BE680105D BE680105A (en) 1965-04-26 1966-04-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1747865A GB1142612A (en) 1965-04-26 1965-04-26 Improvements in or relating to electric cables

Publications (1)

Publication Number Publication Date
GB1142612A true GB1142612A (en) 1969-02-12

Family

ID=10095873

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1747865A Expired GB1142612A (en) 1965-04-26 1965-04-26 Improvements in or relating to electric cables

Country Status (5)

Country Link
BE (1) BE680105A (en)
BR (1) BR6678946D0 (en)
FR (1) FR1471825A (en)
GB (1) GB1142612A (en)
NL (1) NL6605513A (en)

Also Published As

Publication number Publication date
BR6678946D0 (en) 1973-05-29
BE680105A (en) 1966-10-03
FR1471825A (en) 1967-05-26
NL6605513A (en) 1966-10-27

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