What is the recommended filtration frequency for transformer oil in power transformers?

The recommended filtration frequency for transformer oil in power transformers depends on several factors, including the oil’s condition, the presence of contaminants, and operational conditions. Generally, it is advisable to filter transformer oil at least once a year or more frequently if the dissolved gas analysis indicates increased moisture or particulate levels. Regular monitoring and filtration help maintain the dielectric strength and overall performance of the transformer oil.