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Energies 2017, 10(10), 1531; https://doi.org/10.3390/en10101531

On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves

1
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
2
Shandong Electric Power Research Institute, State Grid Shandong Electric Power Company, Jinan 250002, China
*
Author to whom correspondence should be addressed.
Received: 24 August 2017 / Revised: 28 September 2017 / Accepted: 29 September 2017 / Published: 2 October 2017
(This article belongs to the Section Electrical Power and Energy System)

Abstract

This study analyzed the transformer electromagnetic gap propagation characteristics. The influence of gap size is also analyzed, and the results experimentally verified. The obtained results indicated that the gap propagation characteristics of electromagnetic wave signals radiated by the partial discharge (PD) source in different directions are substantially different. The intensity of the electromagnetic wave in the gap reaches a maximum at a gap height of 1 cm; and inside the gap, the intensity of the electromagnetic wave depicted an increasing trend at the tail area of the gap. Finally, from the obtained results, some suggestions on where to install sensors in practical systems for ultra high frequency (UHF) PD signal detection in the transformer gap are provided. The obtained results confirmed the feasibility of using this approach. These results can be seen as a benchmark and a challenge for further research in this field. View Full-Text
Keywords: power transformer; partial discharge (PD); UHF detection; gap; propagation characteristics power transformer; partial discharge (PD); UHF detection; gap; propagation characteristics
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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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Zhang, X.; Zhang, G.; Li, Y.; Zhang, J.; Huang, R. On the Feasibility of Gap Detection of Power Transformer Partial Discharge UHF Signals: Gap Propagation Characteristics of Electromagnetic Waves. Energies 2017, 10, 1531.

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