Answer Posted / j.karthik

The MVA rating is only based upon the generating MW capacity
of the plant.
For Example:
50MW is generated in the Powerplant.(i.e. Generator
capacity is:50MW,11kV,0.8P.F,3000RPM)
Now we like to connect this 50MW power to the E.B.grid
then we use one Step UP Transformer i.e. to step up the
voltage from 11kV to 220kV.
Now we can calculate the MVA rating of that step up
transformer as:
i) MVA = MW/costeta
MVA = 50/0.8 = 62.5MVA.

This is the answer.....

By,
Karthik(Engineer)

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