Record Details

Factorisation-based transfer function estimation technique for deformation diagnostics of windings in transformers

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Factorisation-based transfer function estimation technique for deformation diagnostics of windings in transformers
 
Creator NARAYANA, GS
BADGUJAR, KP
KULKARNI, SV
 
Subject FREQUENCY-RESPONSE ANALYSIS
POWER TRANSFORMERS
RATIONAL APPROXIMATION
PARAMETER-IDENTIFICATION
DOMAIN RESPONSES
FRA
SUPPORT
MODEL
SFRA
 
Description Mechanical deformations of transformer windings are identified through variations observed in their frequency response (FR). This study proposes a new way of determining a transfer function (TF) from measured FR data using factorisation principles as against established ways of finding it through rational fitting algorithms or least-square estimation. It is observed that some characteristics of FR of a transformer winding are similar to FR of first-and second-order systems, and this has been the basic motivation for the reported work. In the proposed method, TF is expressed as a combination of first- and second-order polynomials. The algorithm is applicable over a wide-frequency range and for high-order systems. Initial guesstimates for locations of poles/zeros, orders of TFs, and enforcement of poles to the left half of the s-plane are not required. The algorithm is validated through three case studies and its accuracy is checked through commonly used statistical indicators. The application of the algorithm is also demonstrated on a 500 kVA distribution transformer. The method is simple and accurate in estimating TFs for their further use in the deformation diagnostics of transformer windings.
 
Publisher INST ENGINEERING TECHNOLOGY-IET
 
Date 2014-10-15T14:19:49Z
2014-10-15T14:19:49Z
2013
 
Type Article
 
Identifier IET ELECTRIC POWER APPLICATIONS, 7(1)39-46
http://dx.doi.org/10.1049/iet-epa.2012.0148
http://dspace.library.iitb.ac.in/jspui/handle/100/15086
 
Language en