[bug] Wrong usage of transformer impedance correction factor K_T in min case of short-circuit calculation

[envelio-cb]

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Issue

Pandapower does not follow the VDE0102 norm correctly in the min case for transformers. The impedance correction factor K_T should only be applied in the max case.
(See IEC 60909-0:2016 6.3.3)

Pull request is here: #2168

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[pawellytaev]

Hi @envelio-cb, thanks for opening this issue and the PR. I'll close this here, so we can communicate on the PR #2168 directly