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Primary Examiner: Grimley, Arthur T.
Assistant Examiner:
Attorney: Hopgood, Calimafde

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Title: Extruded solid dielectric high voltage cable resistant to electro-chemical trees

Abstract: Extruded dielectric power cables installed underground have their life shortened by the formation of electrochemical trees in the insulation. Tree formation can be prevented if the insulation is initially dry and the cable construction is such that moisture cannot gain access to the insulation under operating conditions encountered during installation and underground use. This invention eliminates initial moisture and has a construction that greatly retards ingress of moisture to the insulation during installation when the cable is in service and prevents longitudinal movement of water along the cable due to accidental damage to the cable or electrical failure.

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Inventors: Bahder, George (Edison, NJ, US)
Eager, Jr., George S. (Upper Montclair, NJ, US)
Silver, David A. (Livingston, NJ, US)

Application Number: 467607
Filing Date: 1974-05-06
Publication_date: 1976-03-09
Assignee: General Cable Corporation (Greenwich, CT)
Primary Class(es): 174/23R 174/102D, 174/102SC, 174/105SC, 174/110PM
Other Classes:
US Patent Ref:

2427507	Sep, 1947	Powell et al.	174/114.
2479924	Aug, 1949	Gillis	174/107.
2589700	Mar, 1952	Johnstone	174/106.
2688652	Sep, 1954	Schumacher	174/102.
2995616	Aug, 1961	Nicolas	174/102.
3180926	Apr, 1965	Trill	174/107.
3433687	Mar, 1969	Price	174/102.
3485938	Dec, 1969	Kingsley	174/107.
3507978	Apr, 1970	Jachimowicz	174/105.
3534149	Oct, 1970	Peacock et al.	174/105.
3557301	Jan, 1971	Priaroggia	174/102.
3602632	Aug, 1971	Ollis	174/36.
3617377	Nov, 1971	Isshiki et al.	174/107.
3638306	Feb, 1972	Padowicz	174/107.
3643004	Feb, 1972	McKean	174/36.
3651244	Mar, 1972	Silver et al.	174/36.
3657809	Apr, 1972	Lehnert	174/107.
3681515	Aug, 1972	Mildner	174/107.
3748369	Jul, 1973	Durakis et al.	174/36.
3754094	Aug, 1973	Ziemek et al.	174/102.
3792192	Feb, 1974	Plate	174/107.

Other Refs: 205,393

May, 1956	AU

Other References: Electrical World, May 1971, p. 134.
Scheffler, E., Electrical Welded Thin Aluminum Envelopes and Their use In Cable Designs, Wire & Wire Products, 4/70, pp. 82-85.