Answer / ashish patil

For Operation of buzzolz relay it required loe liquid level
& formation of gases which can operate float,but in case of
PRD it required pressure with high capacity then PRD operate

Answer / abhishek goyal

when the short ckt or any other fault happening into the
transformer it will detected by the buchhloz relay (gas will
accumulate into the relay). if pressure into the tank is
above the set point of PRD/PRV it will activate. both are
safety device one can sense the gas other one can sense the
pressure.

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