Electricity: conductors and insulators – With fluids or vacuum – Conduits – cables and conductors
Patent
1985-01-11
1986-07-22
Grimley, Arthur T.
Electricity: conductors and insulators
With fluids or vacuum
Conduits, cables and conductors
174 26R, 174120FP, H01B 702, H01B 906
Patent
active
046021213
ABSTRACT:
An oil-filled electric cable in which the solid insulation is formed, at least in part, by separately applied, alternate layers of cellulose paper tape and of film tapes made of a plastic. Prior to application of the tapes around the cable conductor, the moisture content of the paper tape is selected and the swelling of the plastic tape by the oil after application is adjusted, if necessary, such as by immersing the plastic tape in the oil prior to application, so that the swelling of the plastic tape by the oil in the formed cable is offset by the shrinkage of the paper tape during drying of the cable. Also, apparatus for pre-swelling the plastic tape.
REFERENCES:
patent: 2709197 (1955-05-01), Davey
patent: 3194871 (1965-07-01), Garner et al.
patent: 3662092 (1972-05-01), Franco
patent: 3749812 (1973-07-01), Reynolds et al.
patent: 3844860 (1974-10-01), Edwards
patent: 4237334 (1980-12-01), Kojima et al.
Cheng, F. S. et al; Effect of Impregant on the Electrical and Mechanical Properties of Polypropylene Paper; Wire and Wire Products; May 1972; pp. 57-63.
Grimley Arthur T.
Nimmo Morris H.
Societa Cavi Pirelli S.p.A.
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