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correct transformer x calculations #269

@ulfmueller

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@ulfmueller

in pypsa the transformer reactances are in p.u. values. But the base power is not 1 MVA as calculated internally for all other components but the transformer specific installed power (s_nom). Therefore I think we have to change this line accordingly to:
(br_x/100)*rate_a

Whereever else transformer are added to the system in powerd-data/egon-data or eTraGo we should check that it is handled the same.

@ClaraBuettner do you agree? Or did I get s.th. wrong?

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