Method for restoring power cables

Details Method for restoring power cables Method for restoring power cables

2011-07-12

2011-07-12

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Repairing or restoring consumer used articles for reuse

Inorganic material containing articles

C174S02500C, C174S02500C

Reexamination Certificate

active

07976747

ABSTRACT:
A method for extending the useful life of an in-service electrical cable section having a stranded conductor surrounded by a conductor shield encased in a polymeric insulation jacket and having an interstitial void volume in the region of the conductor, the cable section having an average conductor temperature T. The method comprising (i) continuously introducing a non-condensing exclusion fluid into the interstitial volume, the exclusion fluid comprising at least one non-condensing exclusion component having a solubility in the insulation polymer at least 100 times the corresponding solubility of water, each solubility being determined at temperature T; and (ii) injecting a condensing dielectric enhancement fluid into the interstitial void volume, wherein the dielectric enhancement fluid has a virtual flow rate within the interstitial void volume of less than about 0.1 liter per hour.

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