Advanced algorithm for efficiency assessment of external lightning protection system

Abstract

The thesis describes the basic features of lightning current, with an emphasis on the analysis of the peak lightning current. The assumption was used that the peak lightning current can be represented by a Gaussian normal distribution, and the parameters of this distribution were taken from the international standard IEC 62305. After the basic parameters of the distribution of the peak lightning current were adopted, an algorithm was developed that can calculate the probability that the peak lightning current exceed the observed current value. In order to verify the correctness of the derived algorithm, the expression for the probability calculation itself was subjected to control using data also taken from the international standard IEC 62305. The improved algorithm proved to be satisfactory, and in accordance with the normative values, after which it was possible to start developing a program code that accurately describes the required probability expression itself. In addition to developing a more accurate algorithm for calculating the probability that the peak lightning current will be higher than the observed current value, the graduation thesis also developed an improved procedure for specifying the coordinates of the peaks and edges of the observed protected object, as well as the designed lightning protection. These data are printed in an appropriate way, so that they can be used in the program for evaluating the effectiveness of lightning protection. Improvements were introduced to the three-dimensional display of observed protected objects and protection, and their manipulation was facilitated. In order to test the effectiveness of the developed methods, selected examples were solved, the results of which can be found in the appendices of the thesis.

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.