Calculation of the transfer function of a power transformer with online measuring data

• Autorzy: Wimmer, R. , Feser, K.
• Konferencja: II International Conference on Advances in Processing, Testing and Application of Dielectric Materials, 15-17 September, Wrocław 2004
• Języki publikacji: EN

Abstrakty

EN

Mechanical deformation in transformer windings can be detected with the transfer function (TF). Normally the transformer will be disconnected from the public power supply to record the TF (offline measuring). Another possibility is to calculate the TF from the transients overvoltages generated from switching operations or lightning strikes. With adequate sensors these overvoltages can be recorded during operation of the transformer (online-measuring). On the basis of these online-datas diverse problems like separationof excitation- and response signal, too low signal-to-noise ratio, etc. and their solution will be shown in this paper.

Słowa kluczowe

EN

transformer; transient overvoltage; online measurement; transfer function; TF

• Czasopismo: Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje
• Rocznik: 2004
• Tom: Vol. 40, nr 15
• Strony: 86-90
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Wimmer, R.

• University of Stuttgart, Institute of Power Transmission and High Voltage Technology

autor

Feser, K.

• University of Stuttgart, Institute of Power Transmission and High Voltage Technology

Bibliografia

• [1] LEIBFRIED T., Die Analyse der Übertragungs-funktion als Methode zur Überwachung des lsolationszustandes von Groβtransformatoren, Dissertation, Universität Stuttgart, 1996
• [2] BAK-JENSEN J., BAK-JENSEN B., MIKKELSEN S.D., Detection of Faults and Aging Phenomena in Transformers by Transfer Functions IEEE Transactions on Power Delivery, Vol. 10, No. 1, Jan. 1995, pp. 308-314
• [3] ISLAM S.M., LEDWICH G., Locating Transformer Faults through Sensitivity Analysis of High Frequency Modeling Using Transfer Function Approach, IEEE Int. Symp. on Electrical Insulation, Montréal, 1996, Conference Record, pp. 38-41
• [4] CHRISTIAN J., Erkennung mechanischer Wicklungsschäden in Transformatoren mit der Übertragungsfunktion, Dissertation, Universität Stuttgart, 2002
• [5] WIMMER R., FESER K., CHRISTIAN J., Reproducibility of Transfer Function Results, 13th International Symposium on High Voltage Engineering, Delft, 25.-29. August, 2003-Millpress, Rotterdam ISBN 90-77017-79-8, p. 532