A Clarke-Wavelet-Based Time-Domain Power Transformer Differential Protection

R.P. Medeiros, F.B. Costa, K.M. Silva, J.J. Chavez, M. Popov, J.R. Lima Junior

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
71 Downloads (Pure)


Phasor-based differential protection is widely used as the main protection function of the power transformer due to its reliability and ability to discriminate internal from external faults and inrush currents. However, these methods present some delays due to phasor convergence during the fault occurrence and can fail during challenging situations, such as transformer energizations with low second-harmonic content and turn-to-turn and turn-to-ground internal faults. This paper proposes a novel time-domain power transformer differential protection based on Clarke and wavelet transforms with only one differential unit and with automatic setting to be used in any power transformer. Considering both actual and simulation data, the performance validation reveals that the proposed method is efficient, ultra-fast, simple, and independent of the fundamental and harmonic components of the differential current. The method was also implemented in a real-time digital simulator to demonstrate its practical feasibility.

Original languageEnglish
Pages (from-to)317-328
Number of pages12
JournalIEEE Transactions on Power Delivery
Issue number1
Publication statusPublished - 2022

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Power transformers
  • Differential protection
  • Wavelet transform
  • Clarke transform
  • RTDS

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