Evaluation of Losses and Life of Distribution Transformer under Non-linear Load using Wavelet Transfor
Wavelet Based Analysis of Transformer Loss & Life
Keywords:
Harmonics, wavelet transform, 3-phase distribution transformer, transformer loss, life of transformerAbstract
In this paper, impact of harmonics on losses and life of distribution transformer is discussed. Wavelet Transform is used to analyze voltage and current signatures of distribution transformer operating under non-linear load. Power loss is calculated using wavelet based current and voltage profiles. Reduction in life time of the transformer has also been calculated which results due to harmonics in power system. Results show that power loss of a transformer increases under non-linear load as compared to its usage under linear loading, increase in power loss causes decay in transformer’s operational life.
References
Themistoklis, D.K. & A.G. Kladas. Harmonic impact on distribution transformer no-load loss. IEEE Transactions on Industrial Electronics 57(1): 193-200 (2010).
Kohtoh, M., S. Kaneko, S. Okabe & T. Amimoto. Aging effect on electrical characteristics of insulating oil in field transformer .IEEE Transaction on Dielectrics and Electrical Insulation 16(6):1698-1706 (2009).
Yili, H., W.Q. Meeker & J.D. McCalley. Prediction of remaining life of power transformers based on left truncated and right censored lifetime data. The Annals of Applied Statistics 3(2): 857-879 (2009).
Francisco, C. & D.L. Rosa. Harmonics and Power Systems. Taylor and Francis Group, UK (2006).
Nerys, J.W.L., L.R. Lisita, A.M. Oliveira & A.C. Moreira. Additional loss in the core of three phase transformers feeding non-linear loads. IEEE America Transaction 2(1): 48-56 (2004).
Robi, P. The Wavelet Tutorial, 2nd ed. http://users.rowan.edu/~polikar/WAVELETS/WTp art2.html.pdf (2010).
Faiz, J., M.B.B. Sharifian, S.A. Fakheri & E.S. Marzooghi. Derating of distribution transformers for non-sinusoidal load currents using finite element method. Iranian Journal of Science & Technology, Transaction B, 28(B3): 315-322 (2004).
Dalila, M.S., M.N. Khalid & M.M. Shah. Distribution transformer losses evaluation under non-linear load. IEEE Conference of Power Engineering, p. 1-6 ( 2009).
Muhammad, Y.A., M. Mirzaie, A.S. Akmal & S.A. Gholamian. Life estimation of distribution transformer under non-linear loads using calculated loss by 2D-FEM. Journal of Electrical Systems 7(1): 12-24 (2011).
Radakovic, Z., U. Radoman & P. Kostic. Decomposition of the hot-spot factor. IEEE Transaction on Power Delivery 30(1): 403-411 (2015). 11. Xiang, Z. & E. Gockenbach. Determination of the thermal aging factor for life expectancy of 550 kV transformers with a preventive test. IEEE Transaction on Dielectric and Electrical Insulation 20(6): 1984-1991 (2013).
Awadallah, S.K.E., J.V. Milanovic, P.N. Jarman, & Z. Wang. Probabilistic indicators for assessing age and loading-based criticality of transformers to cascading failure events.IEEE Transaction on Power Systems 29(5): 2558-2566 (2014).
Hamid, Y. Effrina & Z.I. Kawasaki. Wavelet packet transform for RMS and power measurements. IEEE Transactions on Power
Amit, G. & R. Singh. Computation of transformer losses under the effects of non-sinusoidal currents. International Journal of Advanced Computing 2(6): 91-104 (2011).
Gouda, O.E., G.M. Amer & W.A.A. Salem. Predicting transformer temperature rise and loss of life in the presence of harmonic load currents. Ain Shams Engineering Journal 6(3): 113–121 (2012).
Ismail, D., S. Hasan & S. Taib. Magnetizing current, harmonic content and power factor as the indicators of transformer core saturation. Journal of Clean Energy Technologies 1(4): 382-385 (2013).
McBee, K.D. & M.G. Simoes. General smart meter guidelines to accurately assess the aging of distribution transformers. IEEE Transaction on Smart Grid 5(6): 2967-2979 (2014).
Kefalas, T.D. & A.G. Kladas. Harmonic impact on distribution transformer no-load loss. IEEE Transaction on Industrial Electronics 57(1): 193200 (2010).
Dongjin, K., K. Koo, J. Woo & Y. Kim. Hot spot temperature for 154 kV transformer filled with mineral oil and natural ester fluid. IEEE Transaction on Dielectric and Electrical Insulation 19(3): 1013-1020 (2012).
Moses, P.S. & M.A.S. Masoum. Three-phase asymmetric transformer aging considering voltagecurrent harmonic interactions, unbalanced nonlinear loading, magnetic couplings, and hysteresis. IEEE Transaction on Energy Conversion 27(2): 318-327 (2012).
Suja, S. & J. Jerome. Measurement of harmonics using wavelet packets. Iranian Journal of Electrical and Computer Engineering 7(2): 153158 (2008).
