This paper deals with a novel approach of power

\r\ntransformers diagnostics. This approach identifies the exact location

\r\nand the range of a fault in the transformer and helps to reduce

\r\noperation costs related to handling of the faulty transformer, its

\r\ndisassembly and repair. The advantage of the approach is a

\r\npossibility to simulate healthy transformer and also all faults, which

\r\ncan occur in transformer during its operation without its

\r\ndisassembling, which is very expensive in practice. The approach is

\r\nbased on creating frequency dependent impedance of the transformer

\r\nby sweep frequency response analysis measurements and by 3D FE

\r\nparametrical modeling of the fault in the transformer. The parameters

\r\nof the 3D FE model are the position and the range of the axial short

\r\ncircuit. Then, by comparing the frequency dependent impedances of

\r\nthe parametrical models with the measured ones, the location and the

\r\nrange of the fault is identified. The approach was tested on a real

\r\ntransformer and showed high coincidence between the real fault and

\r\nthe simulated one.<\/p>\r\n","references":"[1] M. Brandt, P. Rafajdus, A. Peniak, J. Michalik: Diagnostics system\r\nofpower transformers supported by Finite Element Analysis,\r\nSPEEDAM2012, Sorrento (Italy) , June 20-22, 2012, p.: 806-811, IEEE\r\nXplore, ISBN 978-1-4673-1300-1\r\n[2] M. Koch, S. Raetzke, M. Kreuger: Moisture diagnostics of power\r\ntransformers by a fast and reliable dielectric response method Electrical\r\nInsulation (ISEI), Conference Record of the 2010 IEEE International\r\nSymposium, Page(s): 1 - 5\r\n[3] V. Mentlik, P. Prosr, J. Pihera, R. Polansky, P. Trnka: On-line\r\ndiagnostics of power transformers, Conference Record of the 2006 IEEE\r\nInternational Symposium on Electrical Insulation (IEEE Cat. No.\r\n06CH37794),Page(s): 546 549\r\n[4] U. S. Department of the Interior bureau of reclamation: Transformer\r\nDiagnostic, FIST 3-31, June 2003\r\n[5] S.A. Ryder: Diagnosing Transformer Faults Using Frequency Response\r\nAnalysis, IEEE Electrical Insulation Magazine, 0883-7554\/03, IEEE\r\n2003\r\n[6] S. M. Islam, K. M. Coates, G. Ledwich: Identification of High\r\nFrequency Transformer Equivalent Circuit Using Matlab from\r\nFrequency Domain Data, Industry Applications Conference, pages: 357-\r\n364, 1997, ISBN 0-7803-4067-1.\r\n[7] N. Abeywickrama, Student Member, Y. V. Serdyuk, S. M. Gubanski:\r\nHigh-Frequency Modeling of Power Transformers for Use in Frequency\r\nResponse Analysis (FRA), IEEE Transactions on Power Delivery23,\r\npages: , 2008\r\n[8] T.Y. Ji, W.H. Tang, Q.H. Wu: Detection of power transformer winding\r\ndeformation and variation of measurement connections using a hybrid\r\nwinding model, Electric Power Systems Research 87, pages: 39-46, 2012\r\n[9] E. Rahimpour, J. Christian, K. Feser, H. Mohseni: Transfer Function\r\nMethod to Displacement and Radial Deformation of Transformer\r\nWindings, IEEE Transactions on Power Delivery 18, pages: 493-505,\r\n2003\r\n[10] E. Bjerkan: High Frequency Modelling of Power Transformers: Stresses\r\nand Diagnostics, Ph.D. dissertation, Norwegian Univ. Sci. and Technol.,\r\nTrondheim, Norway, 2005.\r\n[11] M. Brandt, R. Seewald, J. Sedlk, D. Faktorov: Measurement andanalysis\r\nof railway traction transformer using by SFRA method part\r\n2,Diagnostika 11, published by University of West Bohemia, 2011,\r\nISBN978-80-261-0020-1\r\n[12] Jezierski: Transformtory - Teoretick zklady, Academia Praha, 1973,\r\nISBN509-21-875","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 93, 2014"}