Open Type with Conservator

A previous electricity transformer design that has been popular for a long time. It requires transformer oil as an insulator and heat release in the same manner as the hermetically sealed oil type distribution transformer. There are 2 types of fin; corrugated fin and radiator fin. The difference is that it has a conservator installed to reserve the expansion of the oil during operations and a tube to let the air flow. On the end of the tube is a bulb filled with silica gel that absorbs moisture from the air before it enters the transformer. This type requires transformer inspection oil every 6-12 months.