What medium is used to cool and insulate a transformer?

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Multiple Choice

What medium is used to cool and insulate a transformer?

Insulating oil is the medium used to both cool and insulate a transformer. The oil bath surrounds the windings, providing high dielectric strength to prevent arcing between energized parts and the tank, while also soaking up heat from the windings. Because oil has good heat capacity and can be circulated through a cooling system with radiators or heat exchangers, it efficiently removes heat and keeps the transformer from overheating. While other mediums exist in specialized designs (like gas-insulated or dry-type transformers), the common, effective choice for cooling and insulation is oil.

Insulating oil is the medium used to both cool and insulate a transformer. The oil bath surrounds the windings, providing high dielectric strength to prevent arcing between energized parts and the tank, while also soaking up heat from the windings. Because oil has good heat capacity and can be circulated through a cooling system with radiators or heat exchangers, it efficiently removes heat and keeps the transformer from overheating. While other mediums exist in specialized designs (like gas-insulated or dry-type transformers), the common, effective choice for cooling and insulation is oil.

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