Voltage Sag Characterization in a Distribution Systems: A Case Study

Voltage sags caused by the short-circuit faults in transmission and distribution lines have become one of the most important power quality problems facing industrial customers and utilities. Voltage sags are normally described by characteristics of both magnitude and duration, but phaseangle jump should be taken into account in identifying sag phenomena and finding their solutions. In this paper, voltage sags due to power system faults such as single phase-to-ground, phase-tophase, and two-phase-to-ground faults are characterized by using symmetrical component analysis and their effect on the magnitude variation and phase-angle jumps for each phase are examined. A simple and practical method is proposed for voltage sag detection, by calculating RMS voltage over a window of one-half cycle. The industrial distribution system at Bajaj hospital is taken as a case study. Simulation studies have been performed by using MATLAB/SIMULINK and the results are presented at various magnitudes, duration and phase-angle jumps.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Kamble, S. and Thorat, C. (2014) Voltage Sag Characterization in a Distribution Systems: A Case Study. Journal of Power and Energy Engineering, 2, 546-553. doi: 10.4236/jpee.2014.24074.

 [1] (1995) IEEE Recommended Practice for Monitoring Electric Power Quality. IEEE Std. 1159-1995. [2] Heine, P. and Lehtonen, M. (2003) Voltage Sag Distributions Caused by Power Systems Faults. IEEE Transactions on Power Systems, 18, 1367-1373. http://dx.doi.org/10.1109/TPWRS.2003.818606 [3] Naidoo, R. and Pillay, P. (2007) A New Method of Voltage Sag and Swell Detection. IEEE Transactions on Power Delivery, 22, 1056-1063. http://dx.doi.org/10.1109/TPWRD.2007.893185 [4] Juarez, E.E. and Hernandez, A. (2006) An Analytical Approach for Stochastic Assessment OG Balanced and Unbalanced Voltage Sags in Large Systems. IEEE Transactions on Power Delivery, 21, 1493-1500. http://dx.doi.org/10.1109/TPWRD.2005.860266 [5] Wan, D.-J., Ahn, S.-J. and Chung, Y. (2003) A New Definition of Voltage Sag Duration Considering the Voltage Tolerance Curve. IEEE Bologna Power Tech Conference, Bologna, 4, 23-26 June 2003. [6] Bollen, M.H.J. (2000) Understanding Power Quality Problems: Voltage Sags and Interruptions. IEEE Press, New York. [7] Styvaktakis, E., Bollen, M.H.J. and Gu, I.Y.H. (2002) Automatic Classification on Power System Event Using RMS Voltage Measurements. IEEE Power Engineering Society Summer Meeting, 2, 824-829. [8] Ohrstrom, M. and Soder, L. (2003) A Comparison of Two Methods Used for Voltage Dip Characterization. IEEE Power Tech Conference, Bologna, 4, 23-26 June 2003. [9] Bollen, M.H.J. and Gu, I.Y.H. (2006) Signal Processing Of Power Quality Disturbances. IEEE Press. http://dx.doi.org/10.1002/0471931314 [10] Zhang, L.D. and Bollen, M.H.J. (2000) Characteristic of Voltage Dips (Sags) in Power Systems. IEEE Transactions on Power Delivery, 25, 827-832.