Ricerc@Sapienza

Power lines are longitudinally nonuniform, nonsymmetrical systems, where ordinary modal analysis, originally conceived for uniform multiconductor transmission lines (MTL), can be utilized only as a zeroth-order approximation. In this paper, we present an accurate analysis of nonuniform MTLs based on the frequency-domain transmission-matrix formalism for 2n-port systems, where two unequal characteristic immittance matrices need to be defined, one for forward propagation and another for backward propagation.

In high-voltage transmission lines, the continuity of shield wires is often broken to reduce losses. The accurate simulation of the effects of this practice on power line communications in multiconductor transmission lines is performed in order to put in evidence the relevant channel features and the consequences on the radiated electromagnetic fields.

Real-time monitoring of the operation state of wide-area transmission line links has become possible with the help of phasor meter units. Synchronized information acquired by phasor meter units needs to be adequately processed to permit the accurate estimation of the line constants of the transmission link. In this paper, a novel general rigorous compact procedure for correctly processing the measured voltage and current phasors of uniform multiconductor transmission line systems is proposed.