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Sensors 2019, 19(6), 1392; https://doi.org/10.3390/s19061392

Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil

Opole University of Technology, ul.Proszkowska 76, 45-758 Opole, Poland
Received: 1 February 2019 / Revised: 17 March 2019 / Accepted: 20 March 2019 / Published: 21 March 2019
(This article belongs to the Special Issue UHF and RF Sensor Technology for Partial Discharge Detection)
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Abstract

The paper presents the results of the analysis on the variability of the ultra-high frequency (UHF) signals generated by partial discharges (PD) under the long-term AC voltage. Surface PD (SD) are generated by model PD source (PDS) immersed in brand new mineral oil. Three scenarios are compared and investigated, where different solid dielectrics are applied: pressboard paper (PBP), polytetrafluoroethylene (PTFE) and glass-ceramic (GLS). The PDS is powered continuously by the AC voltage with its relative level of 1.3 of the inception voltage (Ui) within 168 h. UHF signals generated by the continuously occurred SD within 168 h are registered. Various indicators describing the variability of the UHF signals emitted by SD are assigned and analyzed in order to discover if there are any relevant trends presented. Furthermore, some long-term characteristics of the UHF signals emitted by the applied PDS are also announced. As a result, some relevant trends are discovered and related to the properties of the applied dielectric materials, thus the variability of the UHF signals emitted by SD is confirmed. The highest variability of the UHF signals is associated with PBP and the first 48 h after PD inception. Moreover achieved results may be potentially applied for modeling of the PD variability in time, which may be useful for works that concern the development of the UHF method. View Full-Text
Keywords: partial discharges; UHF; electrical insulation; dielectrics partial discharges; UHF; electrical insulation; dielectrics
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Kunicki, M. Variability of the UHF Signals Generated by Partial Discharges in Mineral Oil. Sensors 2019, 19, 1392.

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