Power Line Carrier on Insulated Bundle Subconductors of DC and AC Transmission Lines

A system of power line carrier communication, utilizing insulated bundle subconductors and having an attenuation of about 0.1 dB/mi at 100 kHz, is described. Merits and disadvantages of this unconventional method are discussed. Push-pull coupling to the subconductors of one bundle is shown to exhibit an inherent property of high rejection of substation noise, a feature of particular interest for dc transmission lines. Simplified modal analysis is developed leading to a practical solution of coupling and transmission problems on 2-, 3-, and 4-subconductor bundles.