What type of cooling is typically used in outdoor distribution transformers?
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A.
Dry-type
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B.
Air natural
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C.
Oil-immersed
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D.
Forced air
Correct Answer:
C. Oil-immersed
Explanation:
Oil-immersed cooling is the standard method for outdoor distribution transformers. In these units, the core and windings are submerged in an insulating liquid, typically mineral oil, which functions as both an electrical insulator and a primary coolant. This oil absorbs heat through direct contact with the internal components and transfers it to the transformer's outer tank walls or external radiators. Because these units are sealed, they are better protected from environmental hazards like moisture, dust, and debris, making them more durable for outdoor environments compared to dry-type models that rely on direct air contact. While natural air (ONAN) or forced air (ONAF) is used to dissipate heat from the radiators, the internal cooling medium remains oil.
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