Accurate computation of internal impedance of two- layer cylindrical conductors for arguments of arbitrary magnitude

Abstract

Formula for per-unit-length internal impedance of two-layer cylindrical conductors is derived and then upgraded from the standpoint of numerical stability and performance. The proposed formula consists of combinations of modified Bessel functions of the first and second kind, which are better suited for dealing with larger function parameters. Modification of the derived internal impedance formula and a different approach in solving modified Bessel functions produce an algorithm that is numerically stable and highly accurate for arguments of arbitrary magnitude.

Dino Lovrić

Associate Professor | Department of Theoretical Electrical Engineering and Modelling

Associate professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with reserch focused on the development of numerical models of grounding systems in various types of soil, particularly in scenarios involving the dissipation of alternating current and transient currents caused by lightning strikes or switching overvoltages, also involved in developing models of dynamic and transient processes in power systems using modern numerical methods.

Slavko Vujević

Professor Emeritus

An expert in electrical engineering, particularly known for his contributions to numerical modeling of electromagnetic phenomena, lightning protection, and grounding. Throughout his career, he was a key member of the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he taught, mentored students, and actively participated in scientific research and international professional organizations.