Book ChapterDOI
Lecture Notes in Computer Science: S Transform for the Analysis of Impulse Faults in Transformer
N. Vanamadevi,S. Santhi,R. Saranya +2 more
- pp 709-719
TLDR
This paper demonstrates the application of Stockwell transform for the detection and analysis of impulse faults in transformers and pave way to develop an automated impulse fault classification system.Abstract:
The tremendous and rapid growth of digital signal processing has motivated researchers to apply improved signal analysis techniques for the fault diagnosis of transformers. This paper demonstrates the application of Stockwell transform for the detection and analysis of impulse faults in transformers. Stockwell transform (S transform) is a time–frequency transformation method of signal analysis that conveys information directly in terms of time and frequency, and hence, interpretation of result becomes easier. Further, it produces the progressive resolution of the wavelet transform (WT) and maintains a direct link to the Fourier transform. The proposed method is validated through simulation of faults in a lumped parameter model of a layer winding transformer. The results are encouraging and pave way to develop an automated impulse fault classification system.read more
References
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Book
Signal Analysis: Time, Frequency, Scale and Structure
Ronald L. Allen,Duncan W. Mills +1 more
TL;DR: This chapter discusses Signals: Analog, Discrete, and Digital, which is concerned with systems defined by Difference Equations, and its applications, including LTI Systems, Impulse Response, and Convolution.
Journal ArticleDOI
A Novel Approach to the Classification of the Transient Phenomena in Power Transformers Using Combined Wavelet Transform and Neural Network
P. L. Mao,Raj Aggarwal +1 more
TL;DR: In this article, a novel technique for accurate discrimination between an internal fault and a magnetizing inrush current in the power transformer by combining wavelet transforms with neural networks is presented.
Journal ArticleDOI
Monitoring of power transformers using the transfer function method
Thomas Leibfried,K. Feser +1 more
TL;DR: The transfer function concept is well known as an additional method of evaluating the impulse test of power transformers in the test laboratory and another application for this method is monitoring of power transformer in service as discussed by the authors.
Journal ArticleDOI
Impulse testing of power transformers using the transfer function method
Ryszard Malewski,B. Poulin +1 more
TL;DR: In this article, the transfer function of a transformer winding is deconvoluted in the frequency domain from the digitally recorded neutral current and high voltage applied during impulse tests, and the integrity of the winding insulation is determined by comparing the transferred function obtained at full and reduced test voltage.
Journal ArticleDOI
Short-time Fourier and wavelet transforms for fault detection in power transformers during impulse tests
TL;DR: In this paper, 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.