Audio bandwidth interface apparatus for pilot wire relays

Details Audio bandwidth interface apparatus for pilot wire relays Audio bandwidth interface apparatus for pilot wire relays

1994-11-30

1997-01-07

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 62, 361 64, H02H 300

Patent

active

055923542

ABSTRACT:
An apparatus for enabling pilot wire relays to communicate across voice-grade, non-metallic communication channels converts sinusoid signals representative of phase currents at a location in an electric power distribution system to audio band signals representative of the phase of the current signal at that location. These audio band signals are transmitted over a voice-grade non-metallic communication channel to a remote interface module where they are converted to square waves which are compared against square waves representative of the currents in the electrical power distribution system at that location.

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