The Evaluation of Medium Voltage Motor's Current and Voltage Harmonics during Loading

  • Alboyaci, Bora (Dept. of Electrical Engineering, The University of Kocaeli) ;
  • Yorukeren, Nuran (Dept. of Electrical Engineering, The University of Kocaeli)
  • Published : 2007.03.01


This paper presents the results of investigating harmonic levels on medium voltage motors at loading conditions in air separation plant. The essential results of the measurements of the medium voltage motor harmonics are summarized in the values for the total harmonic distortion (THD). Motors loading case is used to assess the current and voltage harmonic distortions. Proper system analysis is important when adding a new motor starting and controlling the equipment. With the result of the paper it is possible to suggest the most appropriate starting and control method. Two medium voltage motors of air separation unit measurement results and simulations are summarized. Both current and voltage harmonic distortions are fitted by using a linear and exponential regression model. The prediction of THD values can be used for this kind of process for future planning by utilities.


  1. R.C. Dugan, M.F. McGranaghan, S. Santoso, H.W. Beaty, “Electrical Power Systems Quality”, McGraw Hill, 2002
  2. J.A. Kay, R.H. Paes, G. Seggewiss, R.G. Ellis 'Methods for the Control of Large Medium Voltage Motors: Application Considerations and Guidelines', IEEE Transactions on Industry Applications, pp. 1688-1696, Vol.36, No.6, 2000
  3. G.S. Greval, S. Poscai, M.M. Hakim, 'Transient Motor Reacceleration Study in an Integrated Petrochemical Facility', IEEE Transactions on Industry Applications, pp. 968-977, Vol.35, No.4, 1999
  4. Math H.J. Bollen 'The Influence of Motor Reacceleration on Voltage Sags', IEEE Transactions on Industry Applications, pp. 667-673, Vol.31, No.4, 1995
  5. J.C. Das, 'The Effects of Momentary Voltage Dips on the Operation of Induction and Synchronous Motors', IEEE Transactions on Industry Applications, pp. 711-718, Vol.26, 1990
  6. J.J. Wu, C.H. Hu, C.C. Yin, C.C. Chiu, 'Application of Regression Models To Predict Harmonic Voltage and Current Growth Trend From Measurement Data at Secondary Substations', IEEE Transactions on Power Delivery, pp. 793-799, Vol.13, No.3, 1998
  7. Universal Industrial Gases Inc.,, 2005
  8. British Oxygen Company Inc.,, 2005
  9. Math H.J. Bollen 'Understanding Power Quality Problems', IEEE Press Series on Power Engineering, 1999
  10. SIMPOW Power System Simulation & Analysis Software, Release 10.8, Copyright(c) STRI AB, 2004

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