DocumentCode :
647972
Title :
Study of transformer winding deformation by frequency response analysis
Author :
Yousof, M.F.M. ; Ekanayake, Chandima ; Saha, Tapan K.
Author_Institution :
Sch. of Inf. Technol. & Electr. Eng., Univ. of Queensland, Brisbane, QLD, Australia
fYear :
2013
fDate :
21-25 July 2013
Firstpage :
1
Lastpage :
5
Abstract :
This paper proposes a methodology to interpret frequency response measurements of a deformed transformer winding due to conductors tilt. To achieve that, geometrical parameters of a three phase prototype transformer is used to simulate the frequency response of one of the windings using the multi-conductor transmission line model. To simulate the response, inter-turn, inter-disc and inter-winding capacitances of the winding based on normal and deformed conditions are computed using finite element method. Using the computed values, the frequency response for both normal and deformed conditions are simulated. The simulated responses are studied by subdividing into four frequency regions and compared using the correlation coefficient. For further analysis, the vector fitting algorithm was implemented to approximate the transfer function of each response. All transfer functions are then represented in the Nyquist diagram to analyse the shape of each plot. From the Nyquist diagram, it was observed that the real minimum of each plot increases as the winding deformation increases. This finding can be used to estimate the winding deformation severity based on the plotted attributes.
Keywords :
Nyquist diagrams; finite element analysis; frequency response; multiconductor transmission lines; transfer functions; transformer windings; Nyquist diagram; conductors tilt; correlation coefficient; finite element method; frequency region; frequency response analysis; frequency response measurement; geometrical parameters; interdisc capacitances; interturn capacitances; interwinding capacitances; multiconductor transmission line model; three-phase prototype transformer; transfer function; transformer winding deformation; vector fitting algorithm; winding deformation; Capacitance; Conductors; Frequency response; Power transformers; Transfer functions; Vectors; Windings; Frequency response analysis; multi-conductor transmission lines; transfer functions; transformer windings;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power and Energy Society General Meeting (PES), 2013 IEEE
Conference_Location :
Vancouver, BC
ISSN :
1944-9925
Type :
conf
DOI :
10.1109/PESMG.2013.6672525
Filename :
6672525
Link To Document :
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