Carrier Current Coupling from a Grounded Static Wire

The increasing cost of power line carrier coupling equipment on newer high-voltage lines has prompted a study of less expensive coupling methods. The purpose of this paper is to reexamine overhead static wire coupling in the light of newer theories and available equipment, and compare this with conventional capacitor coupling. Data are submitted from a 345-kV line showing that static wire coupling can produce an acceptable carrier channel. Coupling loss increase is relatively small, and changing station impedances appears not to change system signal loss appreciably. Calculations of capacitively and inductively coupled voltages substantiate field results. This paper shows the feasibility of grounded static wire coupling, and it is hoped it will generate interest in examining other coupling methods.