Protection Assessment using Reduced Power System Fault Data

Littler, T.B.

  • Published : 2007.06.01


Wavelet transforms provide basis functions for time-frequency analysis and have properties that are particularly useful for the compression of analogue point on wave transient and disturbance power system signals. This paper evaluates the compression properties of the discrete wavelet transform using actual power system data. The results presented in the paper indicate that reduction ratios up to 10:1 with acceptable distortion are achievable. The paper discusses the application of the reduction method for expedient fault analysis and protection assessment.


Wavelets;Protection;Fault Analysis;Data Compression


  1. Mallat S.G., 'A Theory for Multiresolution Signal Decomposition: The Wavelet Representation' IEEE Trans. on Pattern Analysis and Machine Intelligence, Vol. 11, No. 7, pp. 674 –693, 1989
  2. Daubechies I., 'Orthonormal Bases of Compactly Supported Wavelets' Comm. on Pure and Appl. Math., Vol. XLI, 1988, pp. 909 - 996
  3. Daubechies I., 'The Wavelet Transform, Time Frequency Localization and Signal Analysis' IEEE Trans. on Info. Theory, Vol. 36, No. 5, pp. 961 - 1005, Sep. 1990
  4. Strang. G., Nguyen T.Q., Wavelets and Filter Banks, Wellesley-Cambridge Press, 1996
  5. Greenwood A., Electrical Transients in Power Systems, 2nd Ed., New York: Wiley, 1991
  6. Ziv J., Lempel A., 'A Universal Algorithm for Sequential Data Compression' IEEE Trans. on Info. Theory, Vol. IT-23, No. 3, May 1977
  7. Meyer Y., Wavelets: Algorithms and Applications, SIAM, Philadelphia, 1993, pp. 89 - 99
  8. Shepherd B., Tobias J.C., Cochet-Muchy A., 'Experience on the Serial Interfacing of Protection Relays to Telecontrol Systems', Proc. 6th IEE International Conference on Developments in Power System Protection, Publication No. 434, pp. 313 - 318, 1997
  9. Mehta K., Russell B.D., 'Data Compression for Digital Data from Power System Disturbances: Requirements and Technique Evaluation' IEEE Trans. on Power Delivery, Vol. 4, No. 3, pp. 1683 - 1689, July 1989