What capacity should a transformer oil filtration unit have?

The capacity of a transformer oil filtration unit should be determined based on the size and volume of the transformer being serviced. Typically, a unit should have a flow rate of 100 to 500 liters per hour for effective filtration. For larger transformers, a unit with a capacity of 1000 liters or more per hour may be necessary to ensure efficient removal of moisture, particulate matter, and other contaminants from the oil.