Low-impedance restricted earth fault numerical algorithms operation in power-transformer protection

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

Research output: Contribution to journalArticle

Abstract

Low impedance restricted earth fault protection is one of the protection function to protect the transformer winding with earthed star point. This paper presents a critical comparison of restricted earth fault algorithms among four restricted earth fault (REF) numerical relay algorithms: ABB's, AREVA T&D's, SIEMENS's, and GENERAL ELECTRIC's. Advantages and disadvantages of these algorithms are investigated based on speed, sensitivity and selectivity. Also, magnetizing inrush current, over excitation and CT saturation impression on the restricted earth fault operation is presented. After the algorithms assessment, to confirm the results they are simulated by using MATLAB SIMULINK. The relay operation characteristic curves and restraint currents for each of algorithms are then investigated.

Original languageEnglish
Pages (from-to)608-615
Number of pages8
JournalInternational Review on Modelling and Simulations
Volume4
Issue number2
Publication statusPublished - Apr 2011
Externally publishedYes

Keywords

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

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