When PRV operated at power transformer ,can anybody tell me particular pressure

When PRV operated at power transformer ,can anybody tell me particular pressure for 50mva transformer plzzz.

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When PRV operated at power transformer ,can anybody tell me particular pressure for 50mva transforme..

PRV is provided to prevent tr from bursting due to the internal pressure . It could be from 0.4 Kg/cm2 to 4 Kg /cm2. The older tr s had explosion vent with copper foil

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