Fault diagnosis of a power transformer using an improved frequency-response analysis

A transformer is one of the most important units in power networks; thus, fault diagnosis of transformers is quite significant. In this paper, the frequency-response analysis, deemed as a suitable diagnostic method for electrical and/or mechanical faults of a transformer, is employed to make a decis...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2005-01, Vol.20 (1), p.169-178
Main Authors: Kim, J.-W., Park, B., Jeong, S.C., Kim, S.W., Park, P.
Format: Article
Language:English
Subjects:
Criteria
Defective phase
Deviation
discrimination criteria
Dissolved gas analysis
Electric power generation
Fault diagnosis
Faults
Frequency
frequency response analysis
Interpolation
Oil insulation
Partial discharges
Petroleum
Power transformer insulation
Power transformers
Spectra
Spectral analysis
Transformers
US Department of Transportation
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Summary:A transformer is one of the most important units in power networks; thus, fault diagnosis of transformers is quite significant. In this paper, 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. The overall diagnosis results show that the proposed criterion discriminates a defective phase with the highest average hit ratio among all of the provided criteria for selected faults.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2004.835428