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Classification of thermal ageing impact of ester fluid-impregnated pressboard material adopting LIBS

High Voltage 2021年第4期6卷 655-664页

作者： arputhasamy j.amalanathan Nilesh j.Vasa Noureddine Harid Huw Griffiths Ramanujam Sarathi Department of Electrical Engineering Indian Institute of Technology MadrasChennaiIndia Department of Engineering Design Indian Institute of Technology MadrasChennaiIndia HVDM Research Group APECKhalifa UniversityAbu DhabiUAE

This article reports the thermal ageing of ester fluid-impregnated pressboard material along with its performance evaluation using optical emission spectroscopy(OES)and classifi-cation using machine-learning algorithms adopting laser-induced breakdown spectroscopy(LIBS).The surface discharge analysis on ester-impregnated pressboard(EIP)is studied using OES and the plasma temperature was evaluated based on the Cu I emission lines which were higher under the negative DC compared with the positive DC and AC *** LIBS analysis was performed on the EIP material operated at different energy levels in order to acquire the optimal energy required to be used for its classification *** intensity ratio and electron density evaluated from LIBS studies correlated well with the plasma *** lower limit of detection(LOD)calculated based on linear regression analysis for copper peak was around 3.5 times higher than the identification of carbon *** machine-learning techniques like principal component analysis and neural network algorithm have been performed on the LIBS spectral dataset in order to classify the ageing of EIP *** neural network adopting LIBS provided a better classi-fication accuracy on all the aged samples compared with principal component analysis which classified only for the samples aged at higher temperatures.

关键词： thermal analysis fluid

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Investigation on thermally aged natural ester oil for real-time monitoring and analysis of transformer insulation

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High Voltage 2020年第2期5卷 209-217页

作者： arputhasamy joseph amalanathan Ramanujam Sarathi Swayam Prakash Ashok Kumar Mishra Ribhu Gautam Ravikrishnan Vinu Department of Electrical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Chemistry Indian Institute of Technology MadrasChennai 600036India Department of Chemical Engineering Indian Institute of Technology MadrasChennai 600036India

Thermal aging of natural ester oil shows drastic reduction in partial discharge inception voltage(PDIV)and a significant variation is observed only above a certain aging time,under AC,DC,high frequency AC voltages and with harmonic voltages with different total harmonic *** distribution studies on PDIV measurements indicate a reduction in scale parameter(α)with increase in thermal aging temperature.A characteristic reduction in breakdown voltage was observed with the thermally aged ester oil,under AC,DC and standard lightning impulse *** breakdown voltage variation with aged ester oil follows normal ***(UV)analysis of ester oil thermally aged at 160°C has revealed a regular shift of the derived absorbance parameter to longer *** interfacial tension and turbidity exhibits an inverse relationship with the thermally aged ester *** chromatography/mass spectrometric analysis of the thermally aged ester oil predicted the formation of more carboxylic acids and ketones with aging *** steady-state fluorescence on thermally aged ester oil exhibits a shift in its emission profile,which is in tandem with the UV absorption spectroscopic *** analysis can be adopted as a real-time monitoring tool in transformers,to understand the condition of liquid *** viscosity dependence on the wavelength of derivative absorption maxima follows a direct relationship with the thermally aged natural ester oil.

关键词： temperature thermally insulation

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