Abstract
The following article presents the results obtained in experiences that use the Impulse Frequency Response Analysis (IFRA) method with a transformer in service. The IFRA method has been implemented in order to transform the transient signals to the frequency domain using Discrete Fourier Transform (DFT). However, it can be considered that the DFT is not the most suitable tool for this type of analysis, since, by definition, this tool is useful for processing stationary signals. Taking that into consideration, the analysis of transient signals could be hypothetically improved by using continuous wavelet transform (CWT), given their variable time/frequency resolution. The analysis of transient signals in Wavelet domain has improved the repeatability of the frequency response curves, as it has been observed in experimental results. The proposed on-line IFRA method, based on Wavelet transform, was validated under load and noload conditions on a 150 kVA three-phase transformer 13200/225 Volts, in the Campus of the Universidad del Valle, Cali, Colombia.
Highlights
The following article presents the results obtained in experiences that use the Impulse Frequency Response Analysis (IFRA) method with a transformer in service
With the work performed in field the on-line IFRA method is potentiated due to the fact that the results are reliable and repeatable using the established methodology in laboratory
The effectivity of the Continuous Wavelet Transform (CWT) of transient signals in the computation of on-line Frequency Response curves for power transformers remains evidenced in this study to obtain good results
Summary
The following article presents the results obtained in experiences that use the Impulse Frequency Response Analysis (IFRA) method with a transformer in service. One of the most used methods to determine the physical condition of transformers is the Frequency Response Analysis (FRA), which is currently worldwide accepted as a complementary support to other diagnostic techniques.
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