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How Mbase(MVA) is calculated in .raw file

Hi all,

I am adding new machine and I don't know how to choose Mbase (MVA) in the .raw file (under the tab "Machine").

I was given this .raw file that I am working with and the existing Mbase (MVA) for other machines there are different, some are 120MVA, 25MVA, 10MVA etc.

So my question is how this Mbase (MVA) value is calculated/obtained?

The system base in 100MVA

Best regards, A beginner in PSSE