Breather is provided in a transformer to

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Option A: absorb moisture from air entering in the transformer as well as provide breathing to the transformer

Explanation & Concepts:
A breather in a transformer is essential for absorbing moisture from the air that enters the transformer and allows the transformer to breathe, thereby maintaining oil quality and prolonging the transformer's life.

Working Principle: When a transformer operates, temperature changes may create a vacuum or pressure difference leading to air entering the transformer. The breather, typically filled with silica gel, absorbs moisture and prevents it from contaminating the insulating oil, which maintains the integrity of the electrical insulation.

Key Points: Breathers are vital for maintaining the quality of transformer oil.; They prevent moisture related insulation failures.

Advantages: Enhances transformer longevity by keeping oil dry.; Prevents breakdown of insulation due to moisture.

Disadvantages: Requires periodic replacement of the desiccant material.; If saturated, it can no longer effectively prevent moisture ingress.

Applications: Used in oil-immersed transformers.; Applicable in various high voltage electrical equipment.

Additional Info: Breathers typically contain silica gel for effective moisture absorption.. Option B is incorrect as breather does not provide cold air, it functions by absorbing moisture.

Answer: A is correct — A breather absorbs moisture and allows for pressure equalization within the transformer.

Exam Tip: Understand the importance of insulating oil quality and moisture management in transformers as it is crucial in their performance and reliability.

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Option B: provide cold air in transformer

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Option C: absorb moisture from air entering in transformer

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Option D: filter the transformer oil

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