Overvoltage Protection for High Frequency High Voltage Power Transformers

Diego Teruo Mendes de Souza; Bruno Valverde; José Antenor Pomilio

doi:10.18618/REP.2020.1.0045

Authors

Diego Teruo Mendes de Souza Zasso Brazil, Indaiatuba – SP, Brazil
Bruno Valverde Zasso Brazil, Indaiatuba – SP, Brazil
José Antenor Pomilio University of Campinas, Campinas – SP, Brazil

DOI:

https://doi.org/10.18618/REP.2020.1.0045

Keywords:

High Frequency High Voltage Transformer, Overvoltage Protection, Parasitic Elements, Power Electronics, Resonance Excitation

Abstract

Transformers with high-voltage operation may have undesired behavior due to the effects of their parasitic elements. In power electronics applications, if the primary voltage has harmonics, transformer resonances may be excited, causing high primary currents and secondary voltage stress, compromising the device isolation. This behavior is quite dangerous if the transformer operates without load, what means, without damping, because in this situation, the secondary voltage peak can reach more than two times the expected (rated) value. To protect the high frequency high voltage transformer against this dangerous operation, the overvoltage problem in open load condition is carefully explored and explained in this paper, with the proposition of different protection strategies to mitigate its effect, depending on the transformer parasitic elements values. The different strategies are analytically explained and validated by experimental results, showing their criteria design and effectiveness for the protection of high frequency high voltage transformers through the analysis of a 1 kVA, 311V, 20 kHz, 42/512 ferrite core transformer, showing its dynamics working alone and with each protection strategy.

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Author Biographies

Diego Teruo Mendes de Souza, Zasso Brazil, Indaiatuba – SP, Brazil

was born in Ferraz de Vasconcelos, SP, Brazil, on January 9th, 1992. He received the B.S. in Electrical Engineering from the Federal University of Viçosa (UFV), Viçosa, MG, Brazil in 2016 and the M.S. from University of Campinas, Brazil, in 2018. He is currently professor at the Faculty of Americana and R&D Engineer at Zasso Brazil. His research fields of interest include: Power Electronics, Electromagnetism, Control Engineering, Power Grid.

Bruno Valverde, Zasso Brazil, Indaiatuba – SP, Brazil

was born in Jundiaí, Brazil, in 1990. He received the B.S. degree in Electrical Engineering from the Federal University of São Carlos (UFSCar), São Carlos, Brazil, in 2016 and the M.S. from University of Campinas, Brazil, in 2019. He is currently R&D Engineer at Zasso Brazil. His research fields of interest include Power electronics, More Electric Aircraft systems, high voltage resonant sources and Microgrids.

José Antenor Pomilio, University of Campinas, Campinas – SP, Brazil

(M’92–SM’02) was born in Jundiaí, Brazil, in 1960. He received the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Campinas, Brazil, in 1983, 1986, and 1991, respectively. From 1988 to 1991, he was the Head of the Power Electronics Group, Brazilian Synchrotron Light Laboratory. He was a Visiting Professor with the University of Padova, in 1993 and 2015 and with the Third University of Rome, in 2003, both in Italy. He is a Professor with the School of Electrical and Computer Engineering, University of Campinas, where he has been teaching since 1984. Dr. Pomilio was the President of the Brazilian Power Electronics Society in 2000–2002, member of the Administrative Committee of the IEEE Power Electronics Society in 1997–2002, and Associated Editor of the IEEE Transaction on Power Electronics in 2003-2018.