A novel digital directional transformer protection technique based on wavelet packet

This paper presents a novel digital technique for transformer protection. The technique is based on deriving a directional quantity proportional to the fault current signal and the prefault voltage signal. Standard fast wavelet transform (FWT) schemes may not be as effective for data that has chiefly oscillatory features. An effective solution to discrimination involves examining the signal in both the time and frequency domains simultaneously. The wavelet packet transform is an extension of the FWT that allows for finer characterization of signal content for both time and frequency together. A 11/132-kV transformer connected to a 132-kV power system was simulated using Alternative Transient Program/Electromagnetic Transient Program (ATP/EMTP). Results indicate that the proposed technique is stable, reliable, and fast during the discrimination between internal and external faults, magnetizing inrush currents, and internal faults, ratio-mismatch, and saturation of current transformers (CTs).

[1]  H. C. Wood,et al.  A Digital Relaying Algorithm for Detecting Transformer Winding Faults , 1989, IEEE Power Engineering Review.

[2]  A.G. Phadke,et al.  A Microprocessor Based Three-Phase Transformer Differential Relay , 1982, IEEE Transactions on Power Apparatus and Systems.

[3]  K. J. Frohlich,et al.  Elimination of transformer inrush currents by controlled switching. I. Theoretical considerations , 2001 .

[4]  Zhiqian Bo,et al.  Positional protection of transmission line using fault generated high frequency transient signals , 2000 .

[5]  Kuniaki Yabe,et al.  Power differential method for discrimination between fault and magnetizing inrush current in transformers , 1996 .

[6]  Eugeniusz Rosolowski,et al.  A self-organizing fuzzy logic based protective relay-an application to power transformer protection , 1997 .

[7]  M.M. Eissa.  A novel digital directional technique for bus-bars protection , 2004, IEEE Transactions on Power Delivery.

[8]  G. Weller,et al.  A new technique for transformer protection based on transient detection , 2000 .

[9]  Y. Sheng,et al.  Decision Trees and Wavelet Analysis for Power Transformer Protection , 2002, IEEE Power Engineering Review.

[10]  Zhang Zhe,et al.  The multi-differential relaying for transformer protection , 2002, IEEE/PES Transmission and Distribution Conference and Exhibition.

[11]  M. Gomez-Morante,et al.  A wavelet-based differential transformer protection , 1999, IEEE Power Engineering Society. 1999 Winter Meeting (Cat. No.99CH36233).

[12]  Jean-Michel Poggi,et al.  Wavelets and their applications , 2007 .

[13]  D.G. Hart,et al.  An adaptive scheme for digital protection of power transformers , 1991, [Proceedings] Conference Papers 1991 Power Industry Computer Application Conference.

[14]  Zoran Obradovic,et al.  Training an artificial neural network to discriminate between magnetizing inrush and internal faults , 1994 .

[15]  M. S. Sachdev,et al.  A power transformer protection technique with stability during current transformer saturation and ratio-mismatch conditions , 1999 .

[16]  G. Hosemann,et al.  Modal saturation detector for digital differential protection , 1993 .

[17]  M. Victor Wickerhauser,et al.  Adapted wavelet analysis from theory to software , 1994 .

[18]  Pei Liu,et al.  Improved operation of differential protection of power transformers for internal faults , 1992 .

[19]  O. A. S. Youssef,et al.  A wavelet-based technique for discrimination between faults and magnetising inrush currents in transformers , 2002, IEEE Power Engineering Society Summer Meeting,.

[20]  D. W. Nicoletti,et al.  A wavelet-based differential transformer protection , 1999 .

[21]  A. Wiszniewski,et al.  A multi-criteria differential transformer relay based on fuzzy logic , 1995 .

[22]  M. S. Sachdev,et al.  Online identification of magnetizing inrush and internal faults in three-phase transformers , 1992 .

[23]  W. Winkler,et al.  Performance of differential protection for three-winding power transformers during transient CT's saturation , 1989 .

[24]  M. Suzuki,et al.  Digital protection method for power transformers based on an equivalent circuit composed of inverse inductance , 1988 .

[25]  J. Thorp,et al.  A New Computer-Based Flux-Restrained Current-Differential Relay for Power Transformer Protection , 1983, IEEE Transactions on Power Apparatus and Systems.

[26]  B. Kasztenny,et al.  New magnetizing inrush restraining algorithm for power transformer protection , 2001 .