Analysis of Lightning Surge Transference Through Three-Phase Step-Up Transformers
Abstract
Analysis of transformer behavior due to different transient phenomena is of paramount importance, not only from the designer’s perspective, but also from the perspective of the system engineer. One of the situations, where the analysis of the transformer transient behavior is of importance, is the overvoltage protection selection for the generators connected through step-up transformers. It has been acknowledged that the accurate transformer modeling is very important when the transient being studied is dominated by the behavior of the transformer itself. However, frequently it is not possible to obtain the necessary data to compute the parameters needed for the particular transformer model, due to the fact that this data often depends on the transformer internal geometry, which is only available to the manufacturers and is considered proprietary information. This paper proposes one possible high-frequency transformer model, appropriate for the lightning surge transference analysis. Its performance will be analyzed by means of the comparison with the simpler analytical and numerical transformer models, derived for the same purpose and tested by the measurements carried-out on actual transformers.
Petar Sarajčev
Full Professor | Department of Power Grids and Substations
Josip Vasilj
Associate Professor | Department of Power Grids and Substations
Researcher and Associate Professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he teaches courses related to engineering economics, power system analysis, power grids and machine learning. His research focus is the application of advanced numerical methods to problems in the analysis and planning of power system operations.
Ranko Goić
Full Professor | Department of Power Grids and Substations
Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split exeperienced in transmission and distribution networks, renewable energy sources (RES), power system planing and economics