GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

any of the above
large internal fault
saturation of magnetic circuit
over load

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GETCO Exam Paper (30-11-2008)
The function of a breather in a transformer is

to control the level of oil in the tank
to provide protection against over currents
to suppress harmonics
to arrest flow of moisture into the tank

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