الفهرس 
Optical Spectroscopy Review
Experimental Setup and ProceduresOnly 14 pages are availabe for public view
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Abstract
A reliable and smooth operation of power transformer is secured through condition assessment. Vital information could be evaluated from different condition assessment techniques. Optical spectroscopy techniques are used in this thesis for condition assessment of power transformer insulating mineral oil.These techniques includeultraviolet-visible spectroscopy and photo- luminescence spectroscopy. Several aged power transformer mineral oil samples were prepared in the lab. The ageing process included copper catalyst and paper insulation to simulate the real operating conditions inside a power transformer. Also, one sample was aged for six days without copper catalyst or paper insulation to make a comparison and show the effect of accelerated oxidation that occurs in a real power transformer in-service. Ultraviolet-visible (UV-Vis) spectros-copy was used to make this comparison. Dissolved decay products were-evaluated according to ASTM D6802 from the absorbance spectra. The aged sample with copper catalyst and paper insulation took a huge leap and had way more dissolved decay products than the aged sample without copper catalyst or paper insulation. Ultraviolet-visible (UV-Vis) spectroscopy was used to assess the three, six, ten, fifteen days aged samples with copper catalyst and paper insulation in the ageing procedure. The obtained absorbance spectra became broader and shifted to higher absorbance levels with aging.In addition, this research linked the electrical parameter dielectric dissipation factor with theUV-Vis spectra. A strong linear correlation was established between dissolved decay products and dielectric dissipation factor.For photoluminescence (PL) spec-troscopy, the emission intensitydropped heavily for the aged samples with copper catalyst and paper insulation. Although the emission spectra had valu-able information, this information could not be pinned down due to the heavy DROP in the intensity. Eventually, a novel carbon dot material was proposed as a photo- luminescence sensor to assess the condition of the mineral insulating oil in power transformer. This material enhanced the heavily dropped emission intensity of the four aged samples with copper catalyst and paper insulation. In addition, this material was sensitive to the change in ageing duration of the aged samples. A strong correlation was made between the area under the photoluminescence spectra and the dielectric dissipation factor.