Previous Year Question
What type of cooling is typically used in outdoor distribution transformers?
Correct answer: A
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).
Step-by-step solution
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.
Exam tip
Typical outdoor distribution transformer = oil immersed, usually ONAN.
Quick method
Typical outdoor distribution transformer = oil immersed, usually ONAN.