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Answer Posted / niloy
Buckolz Relay is connected between transformer tank and
conservator.It gives protection from mainly over
heating.The overheating can be done by any way-- by
sparking or by short circuit or by any internal fault.When
transformer oil overheated it decomposes itself and create
some hydrocarbon and produce hydrogen gas.. This light
weight hydrogen gas moves to the upward direction and trap
into the buckolz relay.After collecting a sufficient
ammount of gas the buckolz relay give a alarm signal and
trip the breaker to protect the transformer to getting
damaged from over heating.
We can collect the gas stored in the buckolz relay and can
analyse it to know the types of fault.In big transformer a
gas holder is connected to the buckolz relay to collect the
gas..
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