Unlike oil-filled transformers, which require regular maintenance to replace the oil and prevent it from deteriorating, cast resin transformers do not require any maintenance. This is because the epoxy resin insulation used in cast resin transformers is more durable and resistant to moisture than oil, and it does not require any regular replacement or upkeep.
However, this does not mean that cast resin transformers do not require any maintenance at all. Like any electrical equipment, cast resin transformers should be inspected periodically to ensure that they are in good working order and free of any damage or defects. This can help to prevent failures or other problems that could compromise the safety or performance of the transformer.
In general, the maintenance requirements for a cast resin transformer will depend on the specific transformer and the operating conditions it is subjected to. For example, a transformer that is used in a harsh outdoor environment may require more frequent inspection and maintenance than a transformer that is used in a controlled indoor setting. It is also worth noting that some types of cast resin transformers, such as those used in hazardous areas, may have additional maintenance requirements to ensure that they comply with relevant safety standards.