Answer Posted / virendra joshi

Buchholz relay is the Gas operated relay in which there are
two contact & contacts are installaed in such a way where
they can be get short by mercury when gas lift one portion.

If any fault take place in the transformer winding then it
will put a nagative impect & the insulation between two
winding start burning & due to this some gases starts
forming this gas go up & lift the moving side of Bucholz &
through the mercury tripping signal is givan to the relay
installed at HT breaker side & hence the Brekaer gets
tripped & Transformer gets isolated. Means Bucholz relay is
spically installed for protecion of transformer winding
which is physically invisible & for otherfault there is a
OT & WT is provide.

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