NDLI: A new technique to detect winding displacements in power transformers using frequency response analysis

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Volume 1 - 2003

2001 IEEE Porto Power Tech Proceedings (Cat. No.01EX502)

A new technique to detect winding displacements in power transformers using frequency response analysis

Content Provider	IEEE Xplore Digital Library
Author	Coffeen, L. Britton, J. Rickmann, J.
Copyright Year	2003
Description	Author affiliation: Nat. Electr. Energy Testing Res. & Application Center, Georgia Inst. of Technol., Atlanta, GA, USA (Coffeen, L.)
Abstract	A new method of transfer function analysis using spectral density estimates in conjunction with a random error and coherence function calculation has shown excellent experimental results in identifying mechanical displacements in the windings of power transformers. The new technique represents an extension of the traditional low voltage impulse method of frequency response analysis (FRA). Traditional low voltage impulse methods have been used to detect mechanical displacements in transformer windings or clamping structures through detection of changes in the transfer function, but have been limited in practical value due to the sensitivity of the transfer function to differences in the time parameters of the applied impulses, as well as sensitivity of the transfer function to variables such as oil condition and temperature. The new technique offers improved repeatability in diagnosing winding movements, and is based on an objective numerical calculation to quantify changes through a weighted normalized difference calculation.
Sponsorship	IEEE Power Eng. Soc
File Size	691203
File Format	PDF
ISBN	0780379675
DOI	10.1109/PTC.2003.1304329
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-23
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Frequency response Transfer functions Low voltage Spectral analysis US Department of Transportation Windings Clamps Petroleum Temperature sensors
Content Type	Text
Resource Type	Article

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