CALCULATION OF FAST FRONT OVERVOLTAGES IN VICINITY OF A POWER TRANSFORMER

Bruno Jurisic; Tomislav Župan; Mario Jurić; Božidar Filipović-Grčić; Katarina Musulin

doi:10.37798/2022711376

Authors

Bruno Jurisic Dr.
Tomislav Župan
Mario Jurić
Božidar Filipović-Grčić
Katarina Musulin

DOI:

https://doi.org/10.37798/2022711376

Keywords:

fast front transients, power transformer, EMTP, measurement, admittance matrix

Abstract

During their lifespan all the primary equipment installed in power system is subjected to transients. Therefore, it is necessary to adequately dimension and protect the equipment. However, in the networks with high share of renewables, power electronics, cables or near GIS, the failure can occur even though good practice of insulation coordination are fulfilled.

In this paper high frequency power transformer model is presented. Such model is based on measurements of admittance matrix and is adequate for simulation of fast front transient in EMTP like software. Additionally, simulations of lightning and switching overvoltages are given for the observed power transformer unit.