What is the difference between oil-immersed transformers with an oil tank and those without one?
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What is the difference between oil-immersed transformers with an oil tank and those without one?
One has an oil tank and the other doesn’t – that’s the difference. I haven’t studied transformers, but I’ve heard an unreliable explanation according to which the function of oil is insulation and heat dissipation; those without oil are dry-type, and dry-type transformers rely on air cooling.
One has an oil tank and the other doesn’t; what you mean is “one has an oil cushion and the other doesn’t.” Oil serves to provide insulation and aid in heat dissipation. Those without an oil cushion rely on self-cooling, and this approach can be used for small transformers； Large transformers must have oil conservators.
The presence of an oil pillow has nothing to do with self-cooling; self-cooling and fan cooling are two different cooling methods. Fully sealed transformers generally do not have an oil conservator; they use a corrugated tank radiator for oil storage and heat dissipation. But not all fully sealed transformers are without oil pillows; the fully sealed transformers used in our company’s projects are equipped with artificial oil pillows