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Sensors 2018, 18(12), 4236; https://doi.org/10.3390/s18124236

Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers

1
Advanced Technology R&D Center, Mitsubishi Electric Corporation, Amagasaki 6618661, Japan
2
Institute of Power Transmission and High Voltage Technology, University of Stuttgart, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 6 November 2018 / Revised: 24 November 2018 / Accepted: 27 November 2018 / Published: 3 December 2018
(This article belongs to the Special Issue UHF and RF Sensor Technology for Partial Discharge Detection)
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Abstract

Diagnoses of power transformers by partial discharge (PD) measurement are effective to prevent dielectric failures of the apparatus. Ultra-high frequency (UHF) method has recently received attention due to its various advantages, such as the robustness against external noise and the capability of PD localization. However, electromagnetic (EM) waves radiated from PD tend to suffer attenuation before arriving at UHF sensors, because active part of the transformer disturbs the EM wave propagation. In some cases, that results in poor detection sensitivity. To understand propagation and attenuation characteristics of EM waves and to evaluate the detection sensitivity quantitatively, a computational approach to simulate the EM wave propagation is important. Although many previous researches have dealt with EM wave simulation for transformers, validations of those simulations by comparing with the experimental ones have seldom been reported. In this paper, cumulative energies, signal amplitudes and propagation times of EM waves were measured using a 630 kVA transformer. EM wave propagation was computed using the time-domain finite integration technique and the results were compared with the experimentally obtained ones. These simulation results showed good agreement with the experimental ones. The results can serve as guidelines to improve the efficiency of UHF PD detection and offer the possibility to achieve optimal placement of UHF sensors in power transformers. View Full-Text
Keywords: power transformers; partial discharges; electromagnetic wave simulation; UHF PD measurement; UHF antennas power transformers; partial discharges; electromagnetic wave simulation; UHF PD measurement; UHF antennas
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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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Umemoto, T.; Tenbohlen, S. Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers. Sensors 2018, 18, 4236.

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