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Oil-Immersed Natural Cooling

What type of cooling is typically used in outdoor distribution transformers?
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Answer & Explanation
Correct AnswerA. Oil-immersed

Quick Explanation

Outdoor distribution transformers are commonly oil-immersed; the insulating oil removes heat from windings/core and transfers it to the tank/radiators. Typical units use natural oil and natural air circulation (ONAN).

Oil-Immersed Natural Cooling explanatory diagram

Detailed Explanation

Correct Answer

A — Oil-immersed

Explanation

Outdoor distribution transformers are commonly oil-immersed; the insulating oil removes heat from windings/core and transfers it to the tank/radiators. Typical units use natural oil and natural air circulation (ONAN).

Key Concept

Oil-Immersed Natural Cooling

Exam Point

Typical outdoor distribution transformer = oil immersed, usually ONAN.

Quick Trick

Typical outdoor distribution transformer = oil immersed, usually ONAN.

Exam Tip

Typical outdoor distribution transformer = oil immersed, usually ONAN.

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