Abstract
This paper describes the importance of Testing and Analysis of Dissolved Gases in oil-filled electrical power equipment like transformers and OLTCs and maintenance practices adopted based on DGA test results; the case studies wherein faults predictions and or confirmation of faults suggest for further maintenance or actions to be taken to remain the system functional for long life. The paper mentions the various methodology being adopted for the interpretation of DGA test results to conclude the type of faults in the equipment and a comparative study of DGA test results based on proficiency test results carried out by International laboratories concluding a similar type of fault indicating international acceptance of DGA testing of oil filled power equipment.
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