Advantages in using Kalman phasor estimation in numerical differential protective relaying compared to the Fourier estimation method

Bjarne Søndergaard Bukh, Unnur Stella Gudmundsdottir, Per Balle Holst, Kim Boe Jensen, Louise Carina Jensen, Claus Leth Bak

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    Abstract

    This paper demonstrates the results obtained from detailed studies of Kalman phasor estimation used in numerical
    differential protective relaying of a power transformer. The accuracy and expeditiousness of a current estimate in the
    numerical differential protection is critical for correct and not unnecessary activation of the breakers by the protecting relay, and the objective of the study was to utilize the capability of Kalman phasor estimation in a signal model representing the expected current signal from the current transformers of the power transformer. The used signal model included the fundamental frequency, an exponentially decaying current, the 2nd and the 5th harmonic to the fundamental frequency.
    Original languageEnglish
    Title of host publicationProceedings of International Conference on Power System Transients
    Number of pages6
    PublisherIPST
    Publication date2007
    Publication statusPublished - 2007
    EventInternational Conference on Power System Transients (IPST) 2007 - Lyon, France
    Duration: 4 Jun 20077 Jun 2007

    Conference

    ConferenceInternational Conference on Power System Transients (IPST) 2007
    Country/TerritoryFrance
    CityLyon
    Period04/06/200707/06/2007

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