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

Rachid Bouderbala and Hamid Bentarzi ()
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Rachid Bouderbala: M’hamed Bougara University
Hamid Bentarzi: M’hamed Bougara University

International Journal of System Assurance Engineering and Management, 2017, vol. 8, issue 2, No 5, 592-598

Abstract: 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.

Keywords: Power transformer; Harmonic; Harmonic blocking technique; Reliability (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s13198-016-0475-6

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