Evaluation condition of transformer based on infrared thermography results

Transformer is one of the most important equipment in electricity grid since problems in transformer will influence electrical power system stability. Therefore early knowing on transformer abnormality and ability to evaluate the problems can avoid damage on the transformer. Among methods of transformer abnormality monitoring is thermography Monitoring. In PLN P3B Jawa Bali thermographic monitoring of transformer is a new method that have been applied recently. The parts of the transformer that being observed are transformer tank, tap changer, radiator, and bushing. The testing process, transformer tank, radiator, and bushing shared be three side, top, middle, and bottom. In normal condition the thermal pattern of the transformer tank and radiators is cooler at the bottom and gradually warmer towards the top. Unusual thermal pattern of the transformer tanks indicates problems inside the transformer. Based on this result we are able to propose transformer tests such as DGA, oil quality test, checking radiator valves, checking fans, clamp of bushings. As for the cases study we analyze a 150/20 kV transformer 2 in Balara high voltage substation and a 150/20 kV transformer 1 in Cikupa high voltage substation based on abnormality indication on the radiator and maintank.