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

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 o...

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Bibliographic Details
Published inInternational journal of system assurance engineering and management Vol. 8; no. Suppl 2; pp. 592 - 598
Main Authors Bouderbala, Rachid, Bentarzi, Hamid
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.11.2017
Springer Nature B.V
Subjects
Engineering
Engineering Economics
Logistics
Marketing
Organization
Original Article
Quality Control
Relay
Reliability
Safety and Risk
Transformers
Harmonic
Power transformer
Harmonic blocking technique
Reliability
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Summary: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.
ISSN:0975-6809
0976-4348
DOI:10.1007/s13198-016-0475-6