Answer / jiten

PRV (Pressure relief valve) is one of the protection
component in the transformer. The main purpose of the PRV
is to protect the expansion of oil during any inside fault
of transformer.

During fault this PRV operate and trip the transformer. So
it can be protected from further damage.

Answer / ladla

pressure relief or pressure safety valve used in any
chemical/Mechanical equipment or Electrical transformer or
generators to maintain inside pressure for the safety
purpose. Its works automatically when inside pressure is
out of limits. Finally safe the equipment

Answer / k.p.sharma

JITEN IS RIGHT AND NORMALLY THE PRESSURE INSIDE THE
TRANSFORMER TANK REACHES TO 0.5KG/CM2 PRV RELASE THE
PRESSURE (SPRING TYPE ACTION ) AND AS THE PRESSURE COMES TO
0.3KG/CM2 IT GOT RESET.

Answer / swapnil pawar

Pressure relief valve is used were air pressure is
maintained .It is pressure relief valve which maintains
pressure.

For e.g.

If in air cylinder 10kg air pressure is maintained, then if
by chance air pressure increases to 11kg the Pressure
relief valve get activates and 1kg pressure release.
This is used for safety reason.

I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

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