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Accurately calculating the electrical constants of a transmission line, such as an overhead line or an underground cable, is of crucial importance for various types of power system simulations. This article presents some techniques as elements for accurately calculating the transmission line constants. One is a numerical integration technique for rigorously evaluating the ground-return impedance of a transmission line. The technique achieves specified accuracy such as a relative error of 10 −6 with practical computation time and is applicable both to overhead lines and underground cables. A technique to calculate conductor-internal impedances, which preserves at least 7 digits of accuracy, is also presented. For the constant calculations of coaxial cables, a systematic procedure for converting the loop impedances of coaxial conductors into their series impedance matrix is derived. Finally, a method for properly sorting modal quantities to obtain their smooth frequency responses, while considering eigenvalue degeneracy, is given.  He has also been serving as an Adjunct Professor at Doshisha University since 2005. His research interest includes electromagnetic transient analysis of power systems and analysis of surges using electromagnetic field computations.

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