What is the process of transformer oil filtration as described on Wikipedia?

The process of transformer oil filtration, as described on Wikipedia, involves removing impurities and moisture from transformer oil to enhance its insulating properties and extend the life of power transformers. This process typically includes mechanical filtration, where solid particles are removed, and vacuum dehydration, which eliminates water content. The filtered oil is then tested for quality to ensure it meets the required standards for effective operation in power transformers.