Performance Characteristics Of Oil-immersed Transformers

a. Except for the small capacity using copper conductor, the low-voltage winding of oil-immersed transformer generally adopts a cylindrical structure with copper foil wound around the shaft; the high-voltage winding adopts a multi-layer cylindrical structure, so that the ampere-turn distribution of the winding is balanced, the leakage magnetic field is small, the mechanical strength is high, and the short-circuit resistance is strong.
b. The core and winding are fastened separately. The fastening parts such as the height of the device and the low-voltage lead are equipped with self-locking anti-loosening nuts. The non-hanging core structure is adopted, which can withstand the vibration of transportation.
c. The coil and the core are vacuum dried, and the transformer oil adopts the process of vacuum oil filtration and oil injection to minimize the moisture inside the transformer.
d. The oil tank adopts corrugated sheets, which have a breathing function to compensate for the volume change of oil caused by temperature changes, so this product has no oil storage cabinet, which obviously reduces the height of the transformer.
e. Since the corrugated sheet replaces the oil storage cabinet, the transformer oil is isolated from the outside world, which effectively prevents the entry of oxygen and moisture and causes the decline of insulation performance.
f. Based on the above five performance points, it is ensured that the oil-immersed transformer does not need to change oil during normal operation, which greatly reduces the maintenance cost of the transformer and prolongs the service life of the transformer.