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Mode switching in modal domain models of overhead lines and underground cables

This paper presents brief review of different methods for calculation of eigenvalues and eigenvectors for application in the modal transmission line theory. In this field of particular interest is the numerical phenomenon known as “mode switching”. “Mode switching” is related to very specific frequencies and must be properly treated in modal domain models of overhead lines and underground cables. This paper summarizes the methods and identifies the differences among them. Impedance and admittance matrices of overhead lines and underground cables are calculated in wide range of frequencies in order to compare different methods.

Eigenvalue, Eigenvector, Modal transmission line theory, Mode switching, Modal domain, Overhead line, Underground cable

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