NDLI: Temporal and frequency-domain assessment of thermal and electrical ageing of mineral and vegetable oils

Content Provider	IET Digital Library
Author	Chetibi, Fouzia Moulai, Hocine Idir, Omar
Abstract	This study focuses on the effect of accelerated thermal and electrical ageing on the dielectric properties of two vegetable oils (olive and soya oils) and a mineral oil which are thermally aged in sealed bottles at 110°C for durations up to 720 h and electrically submitted up to 2500 low-energy discharges under DC voltage. The investigated properties are the real part of the complex relative permittivity, dissipation factor and conductivity in a large frequency range (20 Hz–10 MHz) using frequency domain spectroscopy. This study also discusses the discharge currents generated in these oils and their corresponding fast Fourier transforms followed by power spectral density analysis. The electrical discharges are applied to the oil samples in a plane–plane configuration electrodes and 2.5 mm gap under DC voltage. The frequency-domain investigated descriptors are: maximum peak, mean value, rms value, peak factor, variance and standard deviation of magnitude spectrum, in addition to the resonance and bandwidth frequency of discharge currents. Furthermore, the spectrograms of these discharge currents are presented, illustrating how the frequency composition and the intensity of each frequency change with time.
Starting Page	1139
Ending Page	1149
Page Count	11
ISSN	17518822
Volume Number	13
e-ISSN	17518830
Issue Number	Issue 8, Oct (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/13/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5634
Journal	IET Science, Measurement & Technology
Publisher Date	2019-07-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Accelerated Thermal Ageing Ageing Bandwidth Frequency Complex Relative Permittivity DC Voltage Dielectric Breakdown And Discharges Dielectric Permittivity Dielectric Property Discharge Currents Discharges (electric) Dissipation Factor Electrical Ageing Electrical Conductivity Electrical Discharges Fast Fourier Transform Frequency 20.0 Hz to 10.0 MHz Frequency Composition Frequency Domain Analysis Frequency Domain Spectroscopy Frequency-domain Assessment Heat And Thermomechanical Treatments Low-energy Discharges Magnitude Spectrum Mineral Oil Minerals Oil Sample Olive Oils Organic Insulation Peak Factor Photonic Technology Plane-plane Configuration Electrodes Power Spectral Density Analysis Resonance Frequency Sealed Bottles Size 2.5 Mm Soya Oils Standard Deviation Temperature 110.0 DegC Temporal Assessment Transformer And Reactors Transformer Oil Vegetable Oils
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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