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Energies 2018, 11(9), 2307; https://doi.org/10.3390/en11092307

Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer

1
Centre of Electromagnetics and Lightning Protection Research (CELP), Department of Electrical and Electronics Engineering, Faculty of Engineering, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia
2
Institute of Advanced Technology (ITMA), Department of Electrical and Electronics Engineering, 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, Kajang, Selangor 43000, Malaysia
*
Authors to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 2 August 2018 / Accepted: 6 August 2018 / Published: 2 September 2018
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Abstract

This paper presents an investigation on the sensitivity of frequency response of a 500 kVA, 11/0.433 kV distribution transformer with and without the presence of a winding clamping structure. Frequency response analysis (FRA) measurements of multiple test configurations were carried out with and without the presence of a winding clamping structure. Statistical analyses based on Pearson’s correlation coefficient (PCC), Spearman’s correlation coefficient (SCC), Kendall’s correlation coefficient (KCC), cross-correlation coefficient (CCF), root mean square error (RMSE), absolute sum of logarithmic error (ASLE), hypothesis test (F-test) and relative factor (RF) were applied to determine the effect of the winding clamping structure. It was found that the removal of the winding clamping structure has an impact on the frequency response signature at the frequency less than 2 kHz during offline measurement. It was found that ASLE and F-test are suitable methods that can be used to indicate the variation of frequency response caused by clamping structure removal of the distribution transformer under study. View Full-Text
Keywords: frequency response analysis (FRA); distribution transformer; winding clamping structure; statistical analysis frequency response analysis (FRA); distribution transformer; winding clamping structure; statistical analysis
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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.; Al-Ameri, S.; Mohd Yousof, M.F.; Jasni, J.; Talib, M.A. Investigation of the Effect of Winding Clamping Structure on Frequency Response Signature of 11 kV Distribution Transformer. Energies 2018, 11, 2307.

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