Home » News » The Difference Between Dry-Type and Oil-Filled Transformers (1)

Transformers are very useful devices that allow electricity to be used efficiently by things that can only handle low voltage electricity. Trying to power a small appliance directly from an electric pylon would lead to an unwanted explosion! They take the high voltage electricity from power stations, and transform it into low voltage electricity that can be safely used by industrial and commercial properties like offices, homes, and large factories.

There are two types of transformers that are being used right now: dry-type transformers and oil-filled transformers (also known as liquid-filled transformers). They serve the same purpose, but have some major differences between them. These differences are important enough that certain types of transformers are better for certain situations.


A cooling medium is important to stop the transformer from overheating and becoming a potential fire or explosion hazard. Overheating is inevitable when transformers are under load, but it must be solved because temperature rises are not acceptable when transformers are being used.

Dry-type transformers use air as the cooling medium, while oil-filled transformers use oil instead of air.

Some public places do not use oil-filled transformers because they are considered to be a big fire hazard and, instead, use dry-type transformers. This is because the liquid being used is flammable. A situation where the oil spills, leaks, or becomes contaminated could easily happen and put the building’s residents at risk. For this reason, they are restricted to outdoor installations.

Dry-type transformers are the safer option, and you will see them in public places such as transportation hubs and company buildings.

——To be continued

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