Characteristics Of Oil-immersed Transformers

1. The low-voltage windings of oil-immersed transformers, except for small-capacity transformers that use copper conductors, generally utilize a cylindrical structure with copper foil wrapped around a shaft. The high-voltage windings utilize a multi-layer cylindrical structure, resulting in a balanced ampere-turn distribution, minimal magnetic flux leakage, high mechanical strength, and strong short-circuit resistance.
2. The core and windings are each secured with self-locking nuts, including the height of the transformer and the low-voltage leads. The core-free structure withstands the vibrations of transportation.
3. The coils and core are vacuum-dried, and the transformer oil is vacuum filtered and filled to minimize moisture inside the transformer.
4. The oil tank utilizes corrugated sheets, which provide a breathing function to compensate for changes in oil volume due to temperature fluctuations. This eliminates the need for an oil conservator, significantly reducing the transformer's height.
5. The corrugated sheets replace the oil conservator, isolating the transformer oil from the outside world, effectively preventing the ingress of oxygen and moisture that could degrade insulation performance. 6. 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 extends the service life of the transformer.