The function of a breather in a transformer is

• A. to suppress harmonics
• B. to provide protection against over currents
• C. to control the level of oil in the tank
• D. to arrest flow of moisture into the tank

Answer: (D)

Function of breather is to extract moisture from air going into the conservator.
it is small container filled with silica gel.
silica gel in breather will be blue colour when installed
silica gel turn into pink colour when absorb moisture.