Detection of winding deformation in power transformers

Sahoo, Saroja Kanti (2013) Detection of winding deformation in power transformers. MTech thesis.



The winding is modeled using finite element method (FEM) based software and parameters such as capacitance and inductance are calculated for 10 section healthy coil. Using these parameter values, SFRA plots are obtained which are a set of reference for deformation analysis. The winding is modeled as radially and axially deformed coils using FEM software. The parameters change with deformation in the winding. The deformation is carried at five consecutive sections, and affected parameters are calculated for the same. The main purpose of doing so is to find the location of deformation corresponding to a similar deformation in an actual transformer. The main advantage of the FEM modeling is we can deform the sections as desired unlike in an actual case and obtain the fingerprint graphs from the modified parameter values. The SFRA plots are obtained for the deformations at five sections for axial and radial deformations. A comparison is carried between the SFRA plots for deformed cases with the reference set. The deviations observed are in resonant frequencies, peak current magnitude and bandwidth. From the observations, the type and location of deformation can be found corresponding to a similar deformation in an actual transformer.

Item Type:Thesis (MTech)
Uncontrolled Keywords:Power transformer, frequency response, resonant frequency, bandwidth, SFRA
Subjects:Engineering and Technology > Electrical Engineering > Power Transformers
Divisions: Engineering and Technology > Department of Electrical Engineering
ID Code:4837
Deposited By:Hemanta Biswal
Deposited On:04 Nov 2013 10:51
Last Modified:20 Dec 2013 15:23
Supervisor(s):Srungavarapu, S

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