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Energies 2019, 12(8), 1466; https://doi.org/10.3390/en12081466

Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations

1
Advanced Lightning, Power and Energy Research (ALPER), Department of Electrical and Electronics Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia
2
Institute of Advanced Technology (ITMA), Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia
3
Faculty of Electrical and Electronics Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor 86400, Malaysia
4
TNB Research Sdn. Bhd., Kajang, Selangor 43000, Malaysia
5
ETEL Ltd., Auckland 0640, New Zealand
*
Author to whom correspondence should be addressed.
Received: 31 January 2019 / Revised: 22 March 2019 / Accepted: 28 March 2019 / Published: 17 April 2019
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper presents an investigation on the resonant oscillations of an 11 kV layer-type winding transformer under standard and chopped lightning impulse overvoltage conditions based on calculated parameters. The resistances, inductances and capacitances were calculated in order to develop the transformer winding equivalent circuit. The impulse overvoltages were applied to the high voltage (HV) winding and the resonant oscillations were simulated for each of the layers based on different electrostatic shield placement configurations. It is found that the placement of grounded shields between layer 13 and layer 14 results in the highest resonant oscillation and non-linear initial voltage distribution. The oscillation and linear stress distributions are at the lowest for shield placement between the HV and low voltage (LV) windings. View Full-Text
Keywords: resonant oscillations; impulse overvoltages; electrostatic shields; transformer windings resonant oscillations; impulse overvoltages; electrostatic shields; transformer windings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Srikanta Murthy, A.; Azis, N.; Mohd Yousof, M.F.; Jasni, J.; Othman, M.L.; Talib, M.A.; Das, B.P. Investigation on the Resonant Oscillations in an 11 kV Distribution Transformer under Standard and Chopped Lightning Impulse Overvoltages with Different Shield Placement Configurations. Energies 2019, 12, 1466.

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