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Answer Posted / gova
It is a gas actuated relay.It has two floats.
one is top float(bucholz alarm) which is operated when
oil level in transformer decreases and for a minor fault
which is developing.The gas is collected at the top of
bucholz relay, thus displacing the oil in the top and thus
causes the float to fall down and make the NO contact.
The other is bottom float(bucholz trip) which is
operated for a severe fault which causes oil inrush towards
the bottom of bucholz relay and thus causes the float to
make the NO contact thus isolating the supply to the
transformer.Sometimes buchols relay will operate for a
feeder through fault which causes jerk in the transformer
causing oil inrush.
cheers
gova
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