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System for detection of the phase of an electrical signal on an alternating circuit power line

  • US 5,467,011 A
  • Filed: 06/01/1994
  • Issued: 11/14/1995
  • Est. Priority Date: 05/06/1992
  • Status: Expired due to Term
First Claim
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1. A system for detecting a modulated signal on a remote local power line supplied with power from a main power line having an alternating voltage, said alternating voltage having a known phase defined as a reference phase comprising:

  • a transmitter for generating a first signal having a stable frequency and modulated with a second signal derived from the reference phase voltage of the main power line;

    said transmitter operably connected to said main power line for transmitting said modulated first signal over said power line;

    a receiver operable to receive said first signal and its modulation to detect therefrom modulating second signal derived from the reference phase voltage for phase comparison with the phase of an alternating voltage on the local power line;

    said receiver being operably connected to said remote power line spaced apart from the location at which the transmitter is connected to said main power line.

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