Heating device for utilizing the skin effect of alternating current
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 30, 1985
Issued Date -
N/A
app pub date -
Dec 19, 1983
filing date -
Oct 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available