In this thesis, three PD localization methods are developed and discussed. The first method is based on calculated sectional transfer function of the winding in power transformers with design information. This method is based on the multi-conductor transmission line theory which improves the accuracy of PD localization using the design information of the transformer. And further software provided for PD localization is presented. The second method, a highly functional and simplified method is discussed. This method allows investigating and suggesting the possibility of detection of failures of PD with the least amount of time and information regarding the interior design of power transformer. The third method utilizes a machine learning algorithm by simplification of the measurements. The proposed method uses measured partial discharge signals with high frequency current transformer (HFCT) and processed them using a curve fitting (CF) method with a high rated fitting quality. The extracted coefficients of the selected function terms are then evaluated in order to find the PD location.
Schlagworte
Publikation durchsuchen
Bibliographische Angaben
Copyrightjahr
2021
ISBN-Online
978-3-95900-609-5
Verlag
TEWISS, Garbsen
Reihe
Berichte aus dem IfES
Band
03/2021
Sprache
Deutsch
Seiten
140
Produkttyp
Monographie
Inhaltsverzeichnis
KapitelSeiten
Abstract Kein Zugriff
Kurzfassung Kein Zugriff
Contents Kein Zugriff
Abbreviations Kein Zugriff
Variables and Symbols Kein Zugriff
1.1 Statistical analysis of failures in power trsnformers Kein Zugriff
1.2 Common methods of troubleshooting of power transformers Kein Zugriff
1.3 Goals of the thesis Kein Zugriff
2.1 Partial discharge definition Kein Zugriff
2.2 Types of partial discharges Kein Zugriff
2.3 Sources of inner partial discharges Kein Zugriff
2.4 Models and representations of partial discharges Kein Zugriff
2.5 Partial discharge measuring methods Kein Zugriff
2.6 PD interpretation Kein Zugriff
2.7 PD events in power transformers Kein Zugriff
3.1 Theoeretical background Kein Zugriff
3.2 Simulated transfer function Kein Zugriff
3.3 Evaluation of partial discharge localization algorithm Kein Zugriff
3.4 Test set-up Kein Zugriff
3.5 Partial discharge measurement results Kein Zugriff
3.6 PD localization software Kein Zugriff
4.1 Test setup Kein Zugriff
4.2 Data analysis Kein Zugriff
4.3 Algorithm Kein Zugriff
4.4 Corroboration tests and results Kein Zugriff
4.5 Summary Kein Zugriff
4.6 Conclusion Kein Zugriff
5.1 Theoretical background and test setup Kein Zugriff
5.2 Curve fitting methods Kein Zugriff
5.3 Processing the signals and de-noising Kein Zugriff
5.4 Localization algorithm and results Kein Zugriff
