Comparison of low-impedance restricted earth fault protection in power- transformer numerical relays

B. Nim Taj, A. Mahmoudi, S. Kahourzade

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Low-impedance restricted earth fault (REF) protection protects transformer winding via earthed star-point. This paper compares the REF algorithms of five numerical relays: ABB's, AREVA T&D's, SIEMENS's, SCHNEIDER ELECTRIC's and GENERAL ELECTRIC's. Investigated were their advantages and disadvantages in speed, sensitivity, and selectivity. Also, magnetizing inrush current, over excitation, and CT saturation impression on REF operation, are presented. Postassessment, the results were confirmed via simulation on MATLAB SIMULINK. Further investigated were relay operation characteristic curves and restraint currents of each algorithm.

    Original languageEnglish
    Pages (from-to)2458-2474
    Number of pages17
    JournalAustralian Journal of Basic and Applied Sciences
    Volume5
    Issue number12
    Publication statusPublished - 1 Dec 2011

    Keywords

    • Low-impedance restricted earth fault
    • Numerical relay
    • REF
    • Transformer protection

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