Method for restoring power cables

Details Method for restoring power cables Method for restoring power cables

H - Electricity

01

B

H01B 13/32 (2006.01) H01B 9/00 (2006.01)

Patent

CA 2618518

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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