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    Impact of capacitive coupling circuit on online impulse frequency response of a power transformer

    Access Status
    Fulltext not available
    Authors
    Zhao, Z.
    Yao, C.
    Zhao, X.
    Hashemnia, N.
    Islam, Syed
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhao, Z. and Yao, C. and Zhao, X. and Hashemnia, N. and Islam, S. 2016. Impact of capacitive coupling circuit on online impulse frequency response of a power transformer. IEEE Transactions on Dielectrics and Electrical Insulation. 23 (3): pp. 1285-1293.
    Source Title
    IEEE Transactions on Dielectrics and Electrical Insulation
    DOI
    10.1109/TDEI.2015.005518
    ISSN
    1070-9878
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/18563
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 IEEE. Detecting the early signs of mechanical failures of power transformer winding is necessary and is possible with online monitoring techniques. Online impulse frequency response analysis (IFRA) is a promising diagnostic method when a transformer is in service. This paper examines the unrevealed problem existing in the method, namely, the impact of bushing capacitive coupling circuit on online impulse frequency response. An equivalent electrical model of capacitive coupling circuit and transformer winding is established. The frequency response of the capacitive coupling circuit is obtained to study its influence on online impulse frequency response. The parameter variations of capacitive coupling circuit caused by coupling capacitance variation and bushing dielectric breakdown are simulated to investigate their influence on online impulse frequency response signatures. A few experiments are eventually performed to verify the theoretical analysis and simulation results. This paper contributes to the application of online IFRA.

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