Audio bandwidth interface apparatus for pilot wire relays
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United States of America Patent
Stats
-
Jan 7, 1997
Issued Date -
N/A
app pub date -
Nov 30, 1994
filing date -
Mar 19, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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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