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J. A. Sykes and L. F. Morrison, “A Proposed Method of Harmonic Restraint Differential Protection of Transformers by Digital Computer,” IEEE Transactions on Power Apparatus and Systems, Vol. PAS-91, pp. 1266-1273. doi:10.1109/TPAS.1972.293485

has been cited by the following article:

• TITLE: The Discrimination of Inrush Current from Internal Fault of Power Transformer based on EMD

  AUTHORS: Fanyuan Zeng, Qianjin Liu, Chao Shi

  KEYWORDS: Inrush Current; Transformer Protection; HHT; EMD; IMF

  JOURNAL NAME: Energy and Power Engineering, Vol.5 No.4B, November 20, 2013

  ABSTRACT: The method is based on that the waveform of the inrush distorts seriously, while the fault current nearly keeps sinusoid. The complicated signal can be decomposed into a finite intrinsic mode functions (IMF) by the EMD, then define and compute the projection area on X-axis of each IMF—, the specific gravity of SIMF—, and the maximum of —. We can get a new scheme of transformer-protection based on comparing the difference between inrush and fault current. Theoretical analysis show that the method can precisely discriminate inrush and fault current, fault clearance time is about 20ms. Moreover, it is convenient to achieve and hardly be affect by not-periodic component.