The oil-immersed transformer has large market which supply widely.In the process of development,the performance of oil-immersed transformer has been promoted and improved. The main feature of oil immersed transformer is oil.The application must be strict controlled to make performance stability.
1,The oil-immersed transformer usually adopt copper foil winding cylindrical structure except copper wire for small capacity .The high voltage winding adopt multilayer cylindrical structure to make the winding distribution balance,low leakage flux, high mechanical strength and strong anti-short circuit .
2,The iron core and winding adopt fastening measures respectively. The fastening parts such as the height of the machine and the low-voltage wire are all equipped with self-locking anti-loosening nut. The structure of non-lifting core is adopted, which can withstand the jolts of transportation.
3,The oil tank is made of corrugated sheet, which has breathing function to compensate for the change of oil volume caused by temperature change, so the product has no oil storage tank and reducing the height of the transformer.
4,Because of the corrugated piece replaces the oil storage cabinet, the transformer oil is isolated from the outside world, which effectively prevents the oxygen and water from entering and leads to the decline of insulation performance.
According to the above five points, the oil-immersed transformer needs no oil change in normal operation, which greatly reduces the maintenance cost and prolongs the service life of the transformer.