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Classical multiconductor transmission line (MTL) theory, which is employed in electromagnetic transient (EMT) simulators, is built on the assumptions that the wire structure is infinitely long and has a uniform cross-section. Therefore, non-uniformities which occur in physical power systems, such as transmission line crossings, are not represented in classical MTL models. A new transmission line model has been developed to calculate space varying per unit length (PUL) parameter matrices near a conductor crossing using electromagnetic scattering theory. The proposed scattered field transmission line (SFTL) model has been implemented for lossless, frequency-independent conductors, that cross each other at a variable crossing angle. A single dimensional finite difference time domain (1D-FDTD) algorithm has been used to obtain the time-domain solution at each simulation time-step. Obtained results have been compared with those from a three dimensional (3D) full-wave electromagnetic solver.
Gunawardana et al. (2019) studied this question.