A New Efficient Method to Evaluate Carrier Channel Performances on Long EHV Power Lines With Transpositions

A new mathematical model to evaluating the carrier channel performances on lossy, non-uniform multiconductor transmission lines is presented. Travelling wave the ory is used to define the current and voltage propagation equations on transmission systems which present discontinuity points due to phase transpositions, terminal impedances, shunt-faults. The proposed algorithm makes it possible to compute the voltage attenuation at the generic progressive along the line and in abnormal conditions caused by the presence of a shunt-fault. Practical applications are presented for two long EHV transmission lines with phase transpositions. The results obtained show the effects on voltage attenuation produced by the presence of transpositions and line faults and offer useful indications for the optimal choice of coupling arrangements.