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Open AccessArticle

Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field

1
Department of Electrical and Electronic Engineering, Istanbul University-Cerrahpaşa, 34320 Avcilar, Istanbul, Turkey
2
Institute of Electrical Power Engineering, Lodz University of Technology, 90-924 Łódź, Poland
*
Author to whom correspondence should be addressed.
Energies 2020, 13(18), 4830; https://doi.org/10.3390/en13184830
Received: 21 August 2020 / Revised: 10 September 2020 / Accepted: 14 September 2020 / Published: 15 September 2020
(This article belongs to the Special Issue High Voltage Insulating Materials-Current State and Prospects)
In high-voltage equipment, it is vital to detect any failure in advance. To do this, a determination of the partial discharges occurring at different voltage types as well as at different electrode configurations is essential for observing the oil condition. In this study, an experimental setup consisting of a needle–semi-sphere electrode configuration immersed in mineral oil is prepared for laboratory experiment. In such a way, a non-uniform electric field is created and the leakage currents are monitored from the grounded electrode. A total of six different electrode configurations are analyzed during the tests by the use of hemispheres of different diameters as grounded electrodes and copper and steel pointed (medical) needle high-voltage electrodes. In the experiments, the partial discharges occurring at four different voltage levels between 5.4 and 10.8 kV are measured and recorded. The effect of the different electrode configurations and voltage levels on the harmonic distortion are noted and discussed. It is experimentally confirmed that it is possible to measure the leakage current caused by the partial discharges of the corona type in oil at the different metal points, creating high-voltage electrodes and different electric field distributions based on the proposed non-invasive measurement technique. The studies showed that there is a significant rise of even harmonic components in the leakage current during the increase in the partial discharge intensity with the 5th harmonic as dominant. View Full-Text
Keywords: partial discharge; mineral oil; harmonic distortion; non-uniform electric field; discrete Fourier transform partial discharge; mineral oil; harmonic distortion; non-uniform electric field; discrete Fourier transform
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MDPI and ACS Style

Aydogan, A.; Atalar, F.; Ersoy Yilmaz, A.; Rozga, P. Using the Method of Harmonic Distortion Analysis in Partial Discharge Assessment in Mineral Oil in a Non-Uniform Electric Field. Energies 2020, 13, 4830.

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