transformers parts & function of each parts
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Answer Posted / n.ramkumar
Buchholz relay:The Buchholz relay is installed in the
connection pipe between boiler and expansion vessel of
transformer.when in normal operation,the relay is
completely filled with insulating liquid.due to
buoyancy,floats are in their uppermost positions.if
troubles occur inside the transformer,the buchholz relay
responds as follows:
Trouble:Local overheating provokes gradual decomposition of
liquid and solid insulation material plus formation of gas.
Reaction:Gases move to the top,accumulate in the Buchholz
relay and displace the insulation liquid.the liquid level
falls and upper float comes down as well.The permanent
magnet coupled to this float slides along a magnet contact
tube.A contact is operated by the permanent magnet as soon
as the float reaches its response position.A warning signal
is released.Design of the Buchholz relay is such that only
a certain gas volume can be received.
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