Power transients faults on high voltage lines are prominently due to high frequency transients. These transients affect the predicted life and efficiency of equipment. The Fast Fourier Transform (FFT) is helpful in analysing the effect of high frequencies and Frequency Response Analysis (FRA) provide support in diagnosis and detection of deformation in a transformers. The major aim of this study is to analyse the incorporation of frequencies based on resonating core of a particular transformer. Using transfer function method an impedance change in transformer has been observed when equipment is subjected to high voltage transients. The effect of change in impedance is that it degrade the life of a core with respect to time. In this paper, research that has been done already on Transformers of different ratings i.e. 100, 50 and 30 kVA are studied and then an experiment is performed on 50-kVA transformer. It was concluded that the core of a transformer having rating equal or less than 50 kVA practically shows single resonance behavior while above 50 kVA for instance 100-kVA transformer core resonates twice. In actual, result defines the core deviating frequency with respect to the rating of a transformer.
Haseeb Faisal Dr. Kashif Imdad Najeeb Hussain Faisal Sharif "Frequencies Dominations for Different Rating of Distribution Transformer under Transients" Intern Vol. 7 Issue 04 PP. 211-216 April 2020 https://doi.org/10.34259/ijew.20.704211216
[1] S. Okabe, M. Koutou, T. Teranishi, S. Takeda, and T. Saida, A High Frequency Model of an Oil-Immersed Transformer, and its use in Lightning Surge Analysis, Elect. Eng. Jpn. vol. 134
(1), 2001.
[2] Y. Shibuya and S. Fujita, High frequency model and transient response of transformer windings, in Proc. IEEE Power Eng. Soc. Transmission and Distribution Conf. Exhibit., Asia Pacific, Vol. 3, pp. 1839–1844, 2002.
[3] Y. Shibuya and S. Fujita, High frequency model of transformer winding, Elect. Eng. Jpn. Vol. 146(3), 2004.
[4] M. Popov, L. Van der Sluis, R. P. P. Smeets, J. Lopez-Roldan, and V. V. Terzija, Modelling, simulation and measurement of fast transients in transformer windings with consideration of frequency-dependent losses, Inst. Eng. Technol. Electr. Power Appl., vol. 1(1), 2007. Y. Yorozu, M. Hirano, K. Oka, and Y. Tagawa, Electron spectroscopy studies on magneto-optical media and plastic substrate interface, IEEE Transl. J. Magn. Japan, Vol. 2, pp. 740–741, 1987.
[5] Y. Wang, W. Chen, C. Wang, L. Du, and J. Hu, A hybrid model of transformer windings for very fast transient analysis based on quasi-stationary electromagnetic fields, Elect. Power Components Syst., Vol. 36, pp. 540–554, 2008.
[6] P. T. M. Vaessen, Transformer model for high frequencies, IEEE Trans. Power Del., Vol. 3(4), pp. 1761–1768, 1988.
[7] A. Piantini and C. V. S. Malagodi, “Modeling of three-phase distribution transformers for calculating lightning induced voltages transferred to the secondary,” presented at the IEEE 5th Int. Symp. Lightning Protection, Sao Paulo, Brazil, 1999.
[8] N. A. Sabiha and M. Lehtonen, Experimental verification of distribution transformer model under lightning strokes, presented at the IEEE Power Eng. Soc. Power Syst. Conf. Expo., pp. 15–18, 2009.
[9] T. Noda, H. Nakamoto, and S. Yokoyama, Accurate modeling of core-type distribution transformers for electromagnetic transient studies, IEEE Trans. Power Del., Vol. 17(4), pp. 969–976, 2002.
[10] T. Noda, M. Sakae, and S. Yokoyama, Simulation of lightning surge propagation from distribution line to consumer entrance via pole-mounted transformer, IEEE Trans. Power Del., Vol. 19(1), pp. 442–444, 2004.
[11] M. H. Nazemi and G. B. Gharehpetian, Influence of mutual inductance between HV and LV windings on transferred overvoltages, presented at the XIVth ISH Conf., Beijing, 2005.
[12] P. Mitra, A. De, and A. Chakrabarti, Resonant behavior of EHV transformer windings under system originated oscillatory transient over voltages, Int. J. Elect. Power Energy Syst., Vol. 33(1), pp. 1760–1766, 2011.
[13] A. N. de Souza, M. G. Zago, O. R. Saavedra, C. C. Oba Ramos, and K. Ferraz, A computational tool to assist the analysis of the transformer behavior related to lightning, Int. J. Elect. Power Energy Syst., vol. 33(3), pp. 556–561, 2011.
[14] K. Ragavan and L. Satish, An efficient method to compute transfer function of a transformer from its equivalent circuit, IEEE Trans. Power Del., Vol. 20(2), pp. 780–788, 2005.
[15] A. Miki, T. Hosoya, and K. Okuyama, A calculation method for impulse voltage distribution and transferred voltage in transformer windings, IEEE Trans. Power App. Syst., Vol. 3, pp. 930–939, 1978.
[16] P. G. Blanken, A lumped winding model for use in transformer models for circuit simulation, IEEE Trans. Power Electron., Vol. 16(3), pp. 445–460, 2001.
[17] R. C. Dugan, R. Gabrick, J. C. Wright, and K. V. Pattern, Validated techniques for modeling shell-form EHV transformers, IEEE Trans. Power Del., Vol. 4(2), pp. 1070–1078, 1989.
[18] R. C. Degeneff, W. J. McNutt, W. Neugebauer, J. Panek, M. E. Mc-Callum, and C. C. Honey, Transformer response to system switching voltage, IEEE Trans. Power App. Syst., Vol. (6), pp. 1457–1470, 1982.
[19] R. C. Degeneff, W. J. McNutt, W. Neugebauer, J. Panek, M. E. Mc-Callum, and C. C. Honey, Transformer response to system switching voltage, IEEE Trans. Power App. Syst., Vol. (6), pp. 1457–1470, 1982.
[2] G. M. Kennedy, Transformer Sweep Frequency Response Analysis, energize, pp. 28-33, 2007.
