Oil-immersed transformers rely on oil as the cooling medium, and the cooling methods include oil-immersed self-cooling, wind-immersed self-cooling, oil-immersed water cooling, and forced oil circulation. The oil-immersed transformer adopts a fully oil-filled sealed type. The corrugated oil tank shell adapts to the expansion of oil with its own elasticity and is a permanently sealed oil tank. Oil-immersed transformers have been widely used in various power distribution equipment.

　　Performance characteristics of oil-immersed transformers:

　　1. The low-voltage windings of oil-immersed transformers generally adopt a cylindrical structure with copper foil around the shaft, except for small-capacity copper conductors. The high-voltage winding adopts a multi-layer cylindrical structure so that the ampere-turn distribution of the winding is balanced, the magnetic flux leakage is small, the mechanical strength is high, and the short-circuit resistance is strong.

　　2. The iron core and the winding are respectively fastened, and the fastening parts such as the height of the device and the low-voltage lead are equipped with self-locking locknuts, and the non-suspending structure is adopted, which can withstand the shock of transportation.

　　3. Coils and iron cores are vacuum-dried, and transformer oil is vacuum-filtered and oil-filled to minimize the moisture inside the transformer.

　　4. The oil tank adopts the corrugated sheet, which has a breathing function to compensate for the volume change of the oil caused by the temperature change.

　　5. Since the corrugated sheet replaces the oil conservator, the transformer oil is isolated from the outside world, which effectively prevents the entry of oxygen and water, which will cause a decline in insulation performance.

　　6. According to the above five points of performance, it is guaranteed that the oil-immersed transformer does not need to change the oil during normal operation, which greatly reduces the maintenance cost of the transformer and prolongs the service life of the transformer.

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