Sebastian Coenen - Measurement of Partial Discharges in Power Transformers using Electromagnetic Signals

Measurement of Partial Discharges in Power Transformers using Electromagnetic Signals

Copyright 2012 by Sebastian Coenen. All rights reserved.

D 93 (Dissertation Universitt Stuttgart)

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The Deutsche Nationalbibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data are available in the internet at http://dnb.d-nb.de.

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Books on Demand GmbH, Norderstedt, Germany

ISBN 978-3-84489-613-8

I want to express my deepest gratitude to Prof. Stefan Tenbohlen for his encouraging and cooperative way of supervising this thesis. His challenging academic guidance to new questions and topics made the achievements of this work possible. I appreciated that he also ensured a close connection between this research and practical application. Many thanks to Prof. dr. Johan J. Smit for his co-examination and interest in this work.

I am very much obliged to the Workshop for preparing the laboratory set-ups. My special thank to Erwin Beck for sharing his extensive experience in mechanical production and his constant willingness to manufacture precise constructions out of simple drawings and coffee break discussions. I like to thank the colleagues of the administrative department, Hermine Lwowski, Nicole Schrli and Dr.-Ing. Ulrich Schrli for their help in organisational matters and their personal encouragement, support and advice beyond the professional.

Without the contributions of all students listed in the appendix the extent of this thesis would not have been possible. Special thanks to my former students and colleagues Maximilian Heindl, Michael Beltle, Andreas Mller and Martin Reuter for their exceptional great help during research, development and on-site measurements. Many thanks to all academic colleagues for providing a marvellous work climate.

I am very grateful to Dr.-Ing. Sacha M. Markalous for illuminating discussions round the clock and his academic guidance. I want to express my thanks to the Doble Lemke GmbH for supporting my work in many respects. My special thanks to Richard Heywood and his team of Doble Power Test, UK, where I spent a very nice time sharing their extensive knowledge in transformer condition assessment.

For several on-site measurements I wish to convey my gratitude to the Siemens AG in Nrnberg. I enjoyed working with the test field department as well as the TLM business unit. Special thanks to Uwe Thiess for his commitment for practically relevant measurements. My gratitude also to the respective departments of EnBW and RWE offering interesting case study objects.

I feel deeply grateful to my beloved wife and daughters. They relieved my daily strain, helped me to relax and made it all possible with their confidence, patience and love.

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