Power line communications system

Details Power line communications system Power line communications system

2007-09-11

2007-09-11

Lieu, Julie Bichngoc (Department: 2612)

Communications: electrical

Systems

Selsyn type

C340S315000, C340S315000, C340S315000, C340S315000

Reexamination Certificate

active

10451751

ABSTRACT:
A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power supply as the communications power source thereby using the power supply current as the communications carrier. No additional coupled communications source is required and modulation of an earth link current at the power frequency is especially suitable for remote electrical loads, such as an oil well electric submersible pump, where it is most cost effective to only have the three power conductors and no neutral nor signal wires in the power cable. Embodiments of the invention are described.

REFERENCES:
patent: 3657478 (1972-04-01), Andrews, Jr.
patent: 3728582 (1973-04-01), Agnew

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