Application of Wavelet Transform to Obtain the Frequency Response of a Transformer From Transient Signals—Part 1: Theoretical Analysis

Author

Gomez-Luna, E. ; Aponte Mayor, G. ; Pleite Guerra, Jorge ; Silva Salcedo, Diego Fernando ; Hinestroza Gutierrez, Doris

Author_Institution

Res. Group GRALTA, Univ. del Valle, Cali, Colombia

Volume

28

Issue

3

fYear

2013

fDate

Jul-13

Firstpage

1709

Lastpage

1714

Abstract

This paper introduces a new theoretical method to obtain the frequency-response curve with the transformer in service (online) from the transient signals analysis by applying the continuous wavelet transform. To validate the method, the transient signals were simulated in the Alternative Transient Program for two cases: 1) under injection of pulses over the 60-Hz wave and 2) under switching operations, respectively. To simulate the transformer, a suitable wide-bandwidth model was employed. This study proposes a new setup of the Morlet wavelet, denominated Morlet-Modified, which showed the best results obtained for our application purpose (FRA On-line). This paper is a contribution for signal processing for the online frequency-response analysis technique on transformers.

Keywords

frequency response; power transformers; signal processing; transient analysis; wavelet transforms; Alternative Transient Program; continuous wavelet transform; denominated Morlet-modified wavelet tranform; frequency-response curve; online frequency-response analysis technique; signal processing; transformer simulation; transient signal analysis; wide-bandwidth model; Continuous wavelet transforms; Multiresolution analysis; Power transformers; Transient analysis; Condition monitoring; continuous wavelet transform (CWT); frequency response; power system transients; remote monitoring; theoretical results;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2013.2262058

Filename

6520963