Fault diagnosis of a power transformer using an improved frequency-response analysis
SCIE
SCOPUS
- Title
- Fault diagnosis of a power transformer using an improved frequency-response analysis
- Authors
- Kim, JW; Park, B; Jeong, S; Kim, SW; Park, P
- Date Issued
- 2005-01
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGI
- Abstract
- 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 detective phase with the highest average hit ratio among all of the provided criteria for selected faults.
- Keywords
- defective phase; discrimination criteria; fault diagnosis; frequency response analysis; power transformers; spectral analysis
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24850
- DOI
- 10.1109/TPWRD.2004.835428
- ISSN
- 0885-8977
- Article Type
- Article
- Citation
- IEEE TRANSACTIONS ON POWER DELIVERY, vol. 20, no. 1, page. 169 - 178, 2005-01
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