| 摘要 |
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.
|
