REVIEW ON TRANSFORMER FAULT ANALYSIS TECHNIQUES

ELECTRICAL ENGINERRING

A transformer is one of the most important units in power networks; thus, fault diagnosis of transformers is quite significant. In this proposed approach, the frequency-response analysis, deemed as a suitable diagnostic method for electrical and/or mechanical faults of a transformer, is employed to make a decision over a defective phase. To deal with wideband frequency responses of each phase, a synthetic spectral analysis is proposed, which augments low- and medium-frequency components, and equalizes the frequency intervals of a resulting combined curve by a log-frequency interpolation. Furthermore, for discriminating a defective phase through computing overall amounts of deviation with other phases, the two well-known criteria and three proposed criteria are examined with experiment data. Also the wavelet transform is a powerful tool in the analysis of the power transformer transient phenomena because of its ability to extract information from the transient signals simultaneously in both the time and frequency domain. This paper present review of different technologies for transformer fault analysis. This paper will be helpful for future researcher and students who are study in the field of three phase transformer fault analysis.

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