Admittance-Based Modeling of Transmission Lines by a Folded Line Equivalent

This paper describes a new transmission-line model for frequency-dependent modeling of untransposed overhead lines and underground cables. The nodal admittance matrix is decomposed into two blocks that, respectively, represent the open- and short-circuit conditions of a half-length line obtained by ldquofoldingrdquo about the middle. By subjecting these matrices to rational fitting with inverse ma...