Localisation of discrete change in a transformer winding: a network-function-loci approach

Pramanik, S and Satish, L (2011) Localisation of discrete change in a transformer winding: a network-function-loci approach. In: IET Electric Power Applications, 5 (6). pp. 540-548.

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Abstract

An entirely different approach for localisation of winding deformation based on terminal measurements is presented. Within the context of this study, winding deformation means, a discrete and specific change externally imposed at a particular position on the winding. The proposed method is based on pre-computing and plotting the complex network-function loci e.g. driving-point impedance (DPI)] at a selected frequency, for a meaningful range of values for each element (increasing and decreasing) of the ladder network which represents the winding. This loci diagram is called the nomogram. After introducing a discrete change, amplitude and phase of DPI are measured. By plotting this single measurement on the nomogram, it is possible to estimate the location and identify the extent of change. In contrast to the existing approach, the proposed method is fast, non-iterative and yields reasonably good localisation. Experimental results for actual transformer windings (interleaved and continuous disc) are presented.

Item Type:	Journal Article
Publication:	IET Electric Power Applications
Publisher:	The Institution of Engineering and Technology
Additional Information:	Copyright 2011 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	01 Aug 2011 07:17
Last Modified:	01 Aug 2011 07:17
URI:	http://eprints.iisc.ac.in/id/eprint/39607

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