Short-time Fourier and wavelet transforms for fault detection in power transformers during impulse tests

Satish, L (1998) Short-time Fourier and wavelet transforms for fault detection in power transformers during impulse tests. In: IEE Proceedings of Science, Measurement and Technology, 145 (2). pp. 77-84.

Preview

PDF short_term.pdf Download (2MB)

Abstract

A novel approach using the short-time. Fourier transform and wavelet transform (time-frequency analysis tools) for fault detection during impulse testing of power transformers is described. The neutral and/or capacitively transferred currents which are recorded during an impulse test can be directly analysed with this approach. These currents are considered to be evolving in time, i.e. as nonstationary signals, especially when there is a fault. Results from simulation studies are presented wherein the fault condition is modelled as a fast decaying transient superposed on the neutral current. A comparison of the two transforms is made to assess their ability to detect as small a fault as possible and other implemenational issues. Advantages of these methods over the conventional transfer function method are demonstrated, and it appears that the wavelet transform is better suited for this task.

Item Type:	Journal Article
Publication:	IEE Proceedings of Science, Measurement and Technology
Publisher:	IEE
Additional Information:	Copyright of this article belongs to Institution of Electrical Engineers(IEE)
Department/Centre:	Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited:	16 Sep 2005
Last Modified:	19 Sep 2010 04:20
URI:	http://eprints.iisc.ac.in/id/eprint/3649

Actions (login required)

View Item