Abstract
To ensure reliable operation of Power transformer, condition monitoring of transformer becomes obligatory. In this paper, condition assessment of transformer oil under various working conditions is performed using UV-visible spectrophotometer. Test samples include both laboratorial prepared ones and those obtained from in service transformers. An index table of spectral responses for various faults which predominantly occur in the transformer is developed. The index table will acts as a reference for spectral response of faulted transformer oil. In this paper, an attempt has been made to determine the quality of transformer oil using their spectral response characteristics.
Highlights
Transformer oil acts as an effective coolant in transformer and provides insulation between internal live parts
Transformer oil is of highly absorbing material, the value of absorbance generally exceeds the spectrophotometer saturation range
During measurement of spectral response using spectrophotometer, iso-octane is used as reference solvent in one quartz curvette and another curvette consists of 2 drops of samples diluted by 10 mL of iso-octane
Summary
Transformer oil acts as an effective coolant in transformer and provides insulation between internal live parts. The transformer oil undergoes severe mechanical, electrical and thermal stresses. When the transformer is subjected to overloaded operating conditions and elevated temperature, the possibility of chemical interactions between solid and liquid part of the insulation increases. These interactions deteriorate the quality of the insulating fluid and over certain period of time, the insulating fluid losses its ultimate reason of existence in the transformer. It is important to monitor the quality of the transformer oil and to make sure that the insulating fluid still holds on to its electrical properties. If the specified electrical properties are not met, necessary action has to be taken regarding maintenance such as filtration of transformer oil or its replacement.
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