Vibracode system of supervisory control on a carrier communication channel

Besides providing a high-grade 2-way telephone circuit, this carrier current system used by the Georgia Power Company transmits control signals for operating voltage regulator and capacitor switches, alarm signals when oil circuit breakers trip or tap-changing-under-load transformers get out of step, and telemetered voltage signals.

[1]  R. C. Cheek,et al.  The combination of supervisory control with other functions on power-line carrier channels , 1945, Electrical Engineering.

[2]  H. W. Lensner,et al.  A versatile power-line-carrier system , 1944, Electrical Engineering.

[3]  W. A. Derr,et al.  Multistation Supervisory Control, Telemetering and Communication on Single-Frequency Carrier Channel , 1950, Transactions of the American Institute of Electrical Engineers.

[4]  W. A. Derr,et al.  Carrier supervisory control of pumping station over power cable , 1946, Electrical Engineering.