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Differential relay reliability enhancement using fourth harmonic for a large power transformer

Author

Listed:
  • Rachid Bouderbala

    (M’hamed Bougara University)

  • Hamid Bentarzi

    (M’hamed Bougara University)

Abstract

A differential relay that is very sensitive relay operating even at its limits may be used for protecting a power transformer. However, this characteristic may lead to unnecessary tripping due to transient currents such as an inrush and over excitation current. In order to avoid this mal-operation of the relay, a second and fifth harmonic blocking technique has been used; however this technique is not reliable if a second harmonic magnitude is weak. In this paper, a new approach is proposed using even harmonics (second and fourth). The test results show that this proposed approach is a good blocking technique associated with the differential relay even for large modern power transformer which has small second harmonic as well; it provides a good discrimination between the transient currents and the internal fault currents during internal fault.

Suggested Citation

  • Rachid Bouderbala & Hamid Bentarzi, 2017. "Differential relay reliability enhancement using fourth harmonic for a large power transformer," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 8(2), pages 592-598, November.
    • Handle: RePEc:spr:ijsaem:v:8:y:2017:i:2:d:10.1007_s13198-016-0475-6
    DOI: 10.1007/s13198-016-0475-6
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