Generalized Modeling of Three-phase Overhead Distribution Networks for Steady State Analysis

This paper presents a generalized approach for three-phase networks with ground return, from which Single wire earth return and conventional three-phase networks are obtained. The resulting model allows a more accuracte analyses based on ground resistivity, losses and high-impedance faults location. The modeling starts based on the Single wire earth return leading to the three-phase one. The general three-phase network with ground return model is presented and can be seen as three single wire earth return with different geografic routes. Analysis and discussions about the model related to ground resisistivity, feeders lenght, and distribution systems aplication are included.