High voltage cable
AssigneePirelli Cavi S.p.A.
InventorsClaudio Bosisio, Giulio Tuci
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Abstract
Electrical cable for high and very high voltages includes a plurality of conductors, at least one semiconductive layer, a stratified insulation impregnated with an insulating fluid and an external metal sheath. The insulation is constituted by a paper/polypropylene/paper laminate, wherein polypropylene has been subjected to a treatment such as to allow the laminate to swell up by less than 5% after immersion in decylbenzene at 100.degree. C. for at least 3 days.
Claims13
An electrical cable for high and very high voltages comprising a plurality of conductors, at least one semiconductive layer, a stratified electrical insulation impregnated with an insulating fluid and an external metal sheath, wherein said insulation is constituted by a paper/polypropylene/paper laminate, wherein said laminate includes a central layer of a film of radiated polypropylene and in the presence of the insulating fluid said laminate swells substantially less than a paper/polypropylene/paper laminate which does not include radiated polypropylene, wherein said laminate swells less than 5% when said laminate has been heat treated at 135.degree. C. with infrared rays for at least 15 seconds and is immersed in decylbenzene at 100.degree. C. for at least 3 days.
A high voltage electrical insulation tape comprising a paper/polypropylene/paper laminate, wherein the laminate includes a central layer of a film of radiated polypropylene and in the presence of an insulating fluid said laminate swells substantially less than a paper/polypropylene/paper laminate which does not include radiated polypropylene, wherein said laminate swells less than 5% when said laminate has been heat treated at 135.degree. C. with infrared rays for at least 15 seconds and is immersed in decylbenzene at 100.degree. C. for at least 3 days.
Dependencies are inferred from the claim text.