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An oil-type transformer uses insulating oil for cooling and protection. The oil absorbs the heat and carries it away, which makes the unit stable even under heavy loads. It’s a design that has been around for decades—simple, proven, and honestly, still the first choice for many grids.
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An oil-immersed power transformer is usually found in substations or industrial sites where the load is large and continuous.
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An oil-immersed distribution transformer is the link between the main grid and everyday users. It takes in high voltage and lowers it to a level safe enough for local networks. Most are in the 400 kVA to 2500 kVA range. You’ll find them near housing areas, hospitals, or workshops—basically anywhere stable low-voltage power is needed.
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Not really, but they’re not maintenance-free either. You have to check oil levels, seals, and sometimes run oil tests for moisture or acidity.
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A heavy oil-type power transformer is built to last decades if it’s looked after. But oil-immersed power transformers need periodic inspections and some refurbishing, but the basic design is durable. That’s why utilities still order oil-type transformers in large numbers today.
