Coupling methods for power line carrier systems

POWER LINE carrier channels used for voice communication normally provide adequate performance. The use of carrier in telemetering, control and protective applications, however, increases the requirements for reliability and immunity to interference. Both these factors may be affected by the method used to couple the carrier signal to and from the power line. It is the purpose of this paper to compare line-to-ground and line-to-line coupling with respect to interference susceptibility and over-all channel attenuation.