Answer / deepak vats

Boucholz relay is a device which is used for the protection
of transformer from its internal faults, it is a gas based
relay.
whenever any internal fault occurs in a transformer, the
boucholz relay at once gives a horn for some time, if the
transformer is isolated from the circuit then it stop its
sound itself other wise it trips the circuit by its own
tripping mechanism

Answer / rahul

buccholz relay is a gas-actuated(usually) relay used to
detect internal faults in a trf. It consists of two sets of
mercury floats. when faults occur inside the trf( in paper
insulation, in oil etc.) gases are produced that move the
floats to actuate an alarm ckt.
it fault not rectified quickly, ultimately it causes the
trf ckt to be tripped

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