Answer Posted / vinayak khorate
In oil filled transformer the bucchos relay is mounted in
between connection pipe of Transformer tank and the
conservator.
When fault occurred(slow occurring faults) the oil near by
winding gets heated and decomposed due to which gas bubbles
are release. This bubbles get stuck in the Oil chamber of
reply and hence send the tripping signal. When the fault is
heavy large number of gas bubbles are released, when they
pass over the bucchos reply the tripping mechanism in between
gets triggered and Transformer is disconnected from the
circuit for severe
fault
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