Heating device for utilizing the skin effect of alternating curr

Electricity: conductors and insulators – Conduits – cables or conductors – Conductive armor or sheath

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Details

174102SC, 174106SC, 174110FC, 219301, H01B 902

Patent

active

045323755

ABSTRACT:
An improved power cable for a heating system that utilizes the skin effect of alternating current, and a method and apparatus for joining lengths of the improved cable. In one embodiment, the cable includes a stranded copper conductor (20) surrounded by a semiconductive layer (22) formed by carbonized tetrafluoroethylene (TFE) tape which is surrounded by a primary insulation layer (24) formed by pressure extruded, perfluoroalkoxy resin (PFA), the thickness of which is determined by an equation that considers the eccentric positioning the power cable in a heat tube (14). In a second embodiment, the cable comprises a central conductor (30) surrounded by a semiconductive layer (32), followed by a primary insulation layer (34) formed by pressure extruded PFA. A shield layer (36) formed by a layer of semiconductor material (38) and several helically wrapped drain wires (40) surrounds the primary insulation layer. A protective PFA jacket (42) is pressure extruded over the shield layer.

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patent: 3096210 (1963-07-01), Boonstra
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patent: 3790697 (1974-02-01), Buckingham
patent: 3805218 (1974-04-01), Voida
patent: 3878319 (1975-04-01), Wahl
patent: 4109098 (1978-08-01), Olsson et al.
patent: 4267098 (1981-05-01), Hartwimmer et al.

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