What is the process for a transformer oil change in power transformers?

The process for a transformer oil change in power transformers involves several key steps. First, the transformer is taken offline and isolated from the electrical system. Next, the existing transformer oil is drained, typically using a vacuum system to minimize contamination. The transformer is then inspected for any signs of damage or degradation. After that, new transformer oil is filtered and filled into the transformer, ensuring it meets the required specifications. Finally, the transformer is tested for proper operation before being reconnected to the system.