An oil-immersed transformer is a type of power transmission and distribution equipment that is insulated and cooled by introducing insulating oil inside.

This kind of transformer uses oil as the main insulation means and cooling medium. During operation, the heat generated by the coil and iron core will be transferred to the insulating oil, and then through oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling or forced oil circulation, etc. cooling method to reduce the temperature of the transformer. The structure of an oil-immersed transformer includes iron core, windings, insulation materials and structures, tap changers, oil tanks, oil conservator, cooling devices and other components. This transformer is suitable for use in a variety of environments, especially in applications requiring high mechanical strength and long life. However, it may also spray oil or leak after an accident, causing a fire, so it is usually used outdoors or in places equipped with accident oil pools.

Characteristics of oil-immersed transformers

Moisture and dustproof. Oil-immersed transformers use transformer oil to protect the interior of the transformer from moisture and dust.

Good heat dissipation. Transformer oil has good thermal conductivity, helps dissipate heat, and is suitable for long-term operation.

Strong resistance to short circuit. High-voltage windings usually adopt a multi-layer cylindrical structure, which helps balance ampere-turn distribution, reduce magnetic flux leakage, and enhance mechanical strength.

Easy to maintain. Oil-immersed transformers have relatively low maintenance costs and have a long service life.

Noise level is low. Since the layers of silicon steel sheets are immersed in transformer oil for a long time, the noise of oil-immersed transformers is smaller.

Good insulation performance. Transformer oil has good insulating properties and helps ensure the electrical safety of the transformer.

It should be noted that oil-immersed transformers also require regular inspection and maintenance, such as replacing insulating oil, checking the tightening of windings and cores, and cleaning and maintaining oil tanks, etc., to ensure their safe operation and extend their service life.

S13-M-1250 Oil-Immersed Transformer