A Novel Approach of Power Transformer Diagnostic Using 3D FEM Parametrical Model

Authors: M. Brandt, A. Peniak, J. Makarovič, P. Rafajdus

Abstract:

This paper deals with a novel approach of power transformers diagnostics. This approach identifies the exact location and the range of a fault in the transformer and helps to reduce operation costs related to handling of the faulty transformer, its disassembly and repair. The advantage of the approach is a possibility to simulate healthy transformer and also all faults, which can occur in transformer during its operation without its disassembling, which is very expensive in practice. The approach is based on creating frequency dependent impedance of the transformer by sweep frequency response analysis measurements and by 3D FE parametrical modeling of the fault in the transformer. The parameters of the 3D FE model are the position and the range of the axial short circuit. Then, by comparing the frequency dependent impedances of the parametrical models with the measured ones, the location and the range of the fault is identified. The approach was tested on a real transformer and showed high coincidence between the real fault and the simulated one.

Keywords: Fault, finite element method, parametrical model of transformer, sweep frequency response analysis, transformer.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1096133

References:

[1] M. Brandt, P. Rafajdus, A. Peniak, J. Michalik: Diagnostics system ofpower transformers supported by Finite Element Analysis, SPEEDAM2012, Sorrento (Italy) , June 20-22, 2012, p.: 806-811, IEEE Xplore, ISBN 978-1-4673-1300-1
[2] M. Koch, S. Raetzke, M. Kreuger: Moisture diagnostics of power transformers by a fast and reliable dielectric response method Electrical Insulation (ISEI), Conference Record of the 2010 IEEE International Symposium, Page(s): 1 - 5
[3] V. Mentlik, P. Prosr, J. Pihera, R. Polansky, P. Trnka: On-line diagnostics of power transformers, Conference Record of the 2006 IEEE International Symposium on Electrical Insulation (IEEE Cat. No. 06CH37794),Page(s): 546 549
[4] U. S. Department of the Interior bureau of reclamation: Transformer Diagnostic, FIST 3-31, June 2003
[5] S.A. Ryder: Diagnosing Transformer Faults Using Frequency Response Analysis, IEEE Electrical Insulation Magazine, 0883-7554/03, IEEE 2003
[6] S. M. Islam, K. M. Coates, G. Ledwich: Identification of High Frequency Transformer Equivalent Circuit Using Matlab from Frequency Domain Data, Industry Applications Conference, pages: 357- 364, 1997, ISBN 0-7803-4067-1.
[7] N. Abeywickrama, Student Member, Y. V. Serdyuk, S. M. Gubanski: High-Frequency Modeling of Power Transformers for Use in Frequency Response Analysis (FRA), IEEE Transactions on Power Delivery23, pages: , 2008
[8] T.Y. Ji, W.H. Tang, Q.H. Wu: Detection of power transformer winding deformation and variation of measurement connections using a hybrid winding model, Electric Power Systems Research 87, pages: 39-46, 2012
[9] E. Rahimpour, J. Christian, K. Feser, H. Mohseni: Transfer Function Method to Displacement and Radial Deformation of Transformer Windings, IEEE Transactions on Power Delivery 18, pages: 493-505, 2003
[10] E. Bjerkan: High Frequency Modelling of Power Transformers: Stresses and Diagnostics, Ph.D. dissertation, Norwegian Univ. Sci. and Technol., Trondheim, Norway, 2005.
[11] M. Brandt, R. Seewald, J. Sedlk, D. Faktorov: Measurement andanalysis of railway traction transformer using by SFRA method part 2,Diagnostika 11, published by University of West Bohemia, 2011, ISBN978-80-261-0020-1
[12] Jezierski: Transformtory - Teoretick zklady, Academia Praha, 1973, ISBN509-21-875