Original scientific paper
https://doi.org/10.37798/2022711376
Calculation of Lightning and Switching Overvoltages Transferred through Power Transformer
Bruno Jurišić
orcid.org/0000-0002-9950-5724
; KONČAR - Electrical Engineering Institute Ltd., Zagreb, Croatia
Tomislav Župan
orcid.org/0000-0002-6604-2436
; KONČAR - Electrical Engineering Institute Ltd., Zagreb, Croatia
Mario Jurić
; Croatian Transmission System Operator Ltd., Zagreb, Croatia
Božidar Filipović-Grčić
orcid.org/0000-0002-2230-1336
; University of Zagreb Faculty of electrical engineering and computing, Zagreb, Croatia
Katarina Musulin
; Ravel Ltd., Zagreb, Croatia
Abstract
During their lifespan all primary HV equipment installed in the 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 gas insulated substation (GIS), the failure can occur even though good practices of insulation coordination are fulfilled. In this paper, a high-frequency power transformer model is presented. Such model is based on measurements of admittance matrix and is adequate for simulation of fast front transients in EMTP like software. Additionally, simulations of transferred lightning and switching overvoltages are given for the observed power transformer unit.
Keywords
fast front transients; power transformer; EMTP; measurement; admittance matrix
Hrčak ID:
294305
URI
Publication date:
15.2.2023.
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