How is testing performed on oil-filled transformers?

Testing of oil-filled transformers involves several methods and procedures to ensure their operational integrity and safety. Key tests include insulation resistance testing, power factor tests, and sweep frequency response analysis to assess the transformer’s insulation system and overall health. Additionally, dissolved gas analysis (DGA) is conducted to identify potential thermal or electrical failures by analyzing gases dissolved in the insulating oil. Regular sampling of the transformer oil for contaminants, such as moisture and particulate matter, is essential to maintain effective operation. Transformer sizes can impact the testing approach, as larger oil-filled transformers may require specific equipment and methodologies for effective assessment. It’s vital for maintenance programs to incorporate routine testing to detect problems early and extend transformer life.