Photoluminescence based condition assessment of aged transformer oil

Alshehawy, Abdelrahman M.; Mansour, Diaa‐Eldin A.; Ghali, Mohsen

doi:10.1109/mepcon.2017.8301303

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Techniques employing electromagnetic waves, such as Fourier transform infrared (FTIR), Ultraviolet-Visible (UV-Vis), Photoluminescence (PL), and Nuclear magnetic resonance (NMR) spectroscopy, have emerged as promising tools for quality monitoring in petrochemical and automobile industries, rather than the conventional techniques such as viscosity measurements, the laser flash test, the tribometer test [ 6 ], thermogravimetric analysis, and total acid and base number analysis [ 5 , 11 ]. The simplicity of sampling and testing, faster spectral acquisition and manipulation, and ease in tracking samples’ quality degradation increase its competitive advantages over the conventional methods [ 12 , 13 ]. The spectral visualization of the molecular changes in the samples can be effectively monitored using FTIR analysis [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…The UV-Vis spectrum also gives information about the formation and degradation of chromophores in the material. The radiative relaxation from the excited state followed by the optical absorption provides relevant information regarding a material’s energy bands, which can be probed by PL spectroscopy [ 12 ]. The optical absorption may also result in optical nonlinearity, which can be easily studied using the Z-scan technique [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

et al. 2023

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Ageing of engine oil is an important issue determining the engine life and performance. The present work attempts to delineate the ageing-induced changes in engine oil through the mode-mismatched dual-beam thermal lens (MMDBTL) technique and other conventional spectroscopic techniques. For the analyses, engine oil samples were collected after every 200 km of runtime. As the thermal diffusivity is related to the nonradiative deexcitation upon optical absorption, comprehensive radiative and nonradiative analyses were carried out. The Ultraviolet-Visible, Fourier transform infrared, and Nuclear magnetic resonance spectroscopic analyses point to the structural modification as a result of the breaking of the long-chain hydrocarbons into ketones, aldehydes, esters, and other compounds. This modifies the absorption pattern, which can also be understood from the nonlinear refractive index study using the Z-scan technique. The compositional variations associated with the degradation upon ageing, the length of the hydrocarbon chain, and the formation of newer molecules account for the enhancement of the thermal diffusivity revealed through the MMBDTL techniques. The complementary nature of the radiative and nonradiative emission is understood from the fluorescence study. Thus, the study reveals the possibility of thermal diffusivity measurement as an effective tool for the quality monitoring of engine oil.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

et al. 2023

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“…Thus, researchers are proposing alternative solution to assess the quality of the oil. Differential Scanning Calorimetry (DSC) method [ 10 ], dielectric dissipation factor measurements [ 11 ], infrared (IR) spectroscopy [ 11 ], capacitance measurement [ 12 ], and photoluminescence spectroscopy [ 13 ] have been proposed recently to evaluate the degradation of the transformer oil. Recently, as an attractive and promising analytical tool, the optical spectroscopy technique starts to emerge in assessing the degradation of transformer oil.…”

Section: Introductionmentioning

confidence: 99%

UV-Vis Spectroscopy: A New Approach for Assessing the Color Index of Transformer Insulating Oil

Leong

Ker

Jamaludin

et al. 2018

Sensors

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Monitoring the condition of transformer oil is considered to be one of the preventive maintenance measures and it is very critical in ensuring the safety as well as optimal performance of the equipment. Various oil properties and contents in oil can be monitored such as acidity, furanic compounds and color. The current method is used to determine the color index (CI) of transformer oil produces an error of 0.5 in measurement, has high risk of human handling error, additional expense such as sampling and transportations, and limited samples can be measured per day due to safety and health reasons. Therefore, this work proposes the determination of CI of transformer oil using ultraviolet-to-visible (UV-Vis) spectroscopy. Results show a good correlation between the CI of transformer oil and the absorbance spectral responses of oils from 300 nm to 700 nm. Modeled equations were developed to relate the CI of the oil with the cutoff wavelength and absorbance, and with the area under the curve from 360 nm to 600 nm. These equations were verified with another set of oil samples. The equation that describes the relationship between cutoff wavelength, absorbance and CI of the oil shows higher accuracy with root mean square error (RMSE) of 0.1961.

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A Fuzzy Evaluation Method of Power Transformer Insulation Health State Based on Multi-weight Fusion

Zhang

Wang

et al. 2022

J. Electr. Eng. Technol.

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Photoluminescence based condition assessment of aged transformer oil

Cited by 3 publications

References 17 publications

Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

UV-Vis Spectroscopy: A New Approach for Assessing the Color Index of Transformer Insulating Oil

A Fuzzy Evaluation Method of Power Transformer Insulation Health State Based on Multi-weight Fusion

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