Abstract
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.
Highlights
Power transformer is one of the main components in any transmission networks and they are responsible for transmitting electric power over long distances with minimal power loss
The optical bandwidth of the spectrum at a certain Abs will be referred as the cutoff wavelength (CW) throughout the paper
The results show that Equation (3) produces color index (CI) with a maximum absolute difference of 1.8, an average absolute difference of 0.4647 and root mean square error (RMSE) value of 0.6274
Summary
Power transformer is one of the main components in any transmission networks and they are responsible for transmitting electric power over long distances with minimal power loss. It is essential for power transformer to operate optimally in order to provide continuous and stable electricity supply in assuring homes and businesses run smoothly with minimum disruptions. The lifetime of power transformer is generally related to the degradation of insulating materials in power transformer. Various sensors such as temperature sensor, pressure sensor, and humidity sensor are installed for online monitoring, the output of these sensors cannot provide clear indication on the conditions of the power transformer. One of the insulating materials is the transformer oil which acts as an electrical insulator and a coolant for the power transformer. In Optical Spectroscopy; Elsevier Science: Amsterdam, The Netherlands, 2006; pp.
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