Protection device for power cables with impregnated-paper-based insulation
AssigneePrysmian Cables Et Systemes France
InventorsStéphane Tognali, Pierre Gautier
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Abstract
Protection device for power cables with impregnated-paper-based insulation Protection device for a power cable (3) having an insulation (4) based on oil-impregnated paper and an external protection (15). It comprises a barrier layer (11) placed in contact with the insulator (4) and made of an oil-impermeable elastomer material having a permittivity of between (2) and (100). The elastomer material is practically impermeable to water vapour and has a Mooney viscosity of between (12) and (90) at 100° C.
Claims23
A protection device for a power cable having an insulation based on paper impregnated with a material based on an impregnation oil, the protection device comprising:
- an outer protection;
- and
- a continuous barrier layer placed in contact with the insulation;
- wherein the continuous barrier layer includes an elastomer material that is virtually impermeable to the impregnation oil,
- wherein the elastomer material is practically impermeable to water vapor,
- wherein the elastomer material has a Mooney viscosity greater than or equal to 12 at 100° C., and
- wherein the elastomer material has a Mooney viscosity less than or equal to 90 at 100° C.
A method of protecting a power cable having an insulation based on oil-impregnated paper and using a shrinkable sleeve, the method comprising:
- placing a harrier layer of elastomer material of the virtually oil-impermeable mastic type in contact with the insulation in order to form a continuous barrier around the insulation;
- wherein the barrier layer is placed before the shrinkable sleeve is shrunk.
Dependencies are inferred from the claim text.