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

Autor: Arputhasamy Joseph Amalanathan, Ramanujam Sarathi, Swayam Prakash, Ashok Kumar Mishra, Ribhu Gautam, Ravikrishnan Vinu
Jazyk: angličtina
Rok vydání: 2019
Předmět:
ultraviolet spectra
weibull distribution
power transformer insulation
viscosity
chromatography
organic compounds
transformer oil
fluorescence
harmonic distortion
ageing
partial discharge measurement
mass spectra
surface tension
turbidity
thermally aged natural ester oil
partial discharge inception voltage measurements
aging time
high frequency ac voltages
thermal aging temperature
standard lightning impulse voltage
breakdown voltage variation
aging duration
real-time monitoring
transformer insulation
dc voltages
harmonic voltages
scale parameter
normal distribution
ultraviolet analysis
absorbance parameter
interfacial tension
gas chromatography-mass spectrometric analysis
carboxylic acids
ketones
steady-state fluorescence
emission profile
uv absorption spectroscopy
liquid insulation
viscosity dependence
temperature 160.0 degc
Electrical engineering. Electronics. Nuclear engineering
TK1-9971
Electricity
QC501-721
Zdroj: High Voltage (2019)
Druh dokumentu: article
ISSN: 2397-7264
DOI: 10.1049/hve.2019.0178
Popis: 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 distortion. Weibull 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 voltage. The breakdown voltage variation with aged ester oil follows normal distribution. Ultraviolet (UV) analysis of ester oil thermally aged at 160°C has revealed a regular shift of the derived absorbance parameter to longer wavelengths. The interfacial tension and turbidity exhibits an inverse relationship with the thermally aged ester oil. Gas chromatography/mass spectrometric analysis of the thermally aged ester oil predicted the formation of more carboxylic acids and ketones with aging duration. The 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. Fluorescence analysis can be adopted as a real-time monitoring tool in transformers, to understand the condition of liquid insulation. The viscosity dependence on the wavelength of derivative absorption maxima follows a direct relationship with the thermally aged natural ester oil.
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