Wire and steel tube as AC cable

Electrical transmission or interconnection systems – Conductor arrangements or structure

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H01B 730, H01B 1102

Patent

active

039743985

ABSTRACT:
A steel tube such as a standard iron or steel pipe having about one-eighth inch or thicker walls and an insulated wire therein may be the two conductor legs of an AC distribution line forming a "tube-wire-cable". The skin effect in the steel limits AC flow to the inner surface of the tube to give the tube more or less the same effective electrical conductivity or resistance as that of the wire, while the outer part of the tube wall of steel acts as an almost perfect insulator, also as the grounding wire, also as a very heavy duty protector of the circuit. Two wires inside the tube may have the maximum voltage drop between them corresponding to a three wire single phase AC distribution cable; and the tube, by its skin effect conduction, may be the neutral or grounded conductor with half the maximum voltage drop between it and each of the wires. Similarly, two wires inside and the skin effect conductor of the tube may be used for three-phase AC distribution.

REFERENCES:
patent: 3292016 (1966-12-01), Kafka
patent: 3391243 (1968-07-01), Whitehead
patent: 3515837 (1970-06-01), Ando
patent: 3522440 (1970-08-01), Ando
patent: 3524966 (1970-08-01), Ando
patent: 3531653 (1970-09-01), Willyoung
patent: 3617699 (1971-11-01), Othmer
patent: 3777117 (1973-12-01), Othmer

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