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what is pressure relief valve in D.G ?state its function?
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Answer Posted / dinesh (techie.dinesh@gmail.co
whenever the pressure in the transformer tank increases, the
pressure is released by PRD. PRD reduces the pressure by
splashing the oil outside the tank, i.e the PRD has a preset
value, if the value exceeds beyond the preset value, the prd
comes in action.
and when the PRD reduces the pressure, the vertical
flap/flag mounted on the PRD raises. although the pressure
is reduced, the flap wont lowered, it is used to indicate
the supervisor/operator that the pressure value has
increased. once the operator get noticed, he will manually
lower that flap
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