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Why do we have to sometimes recalculate the manufactured per unit (PU) values of model impedances of power transformers in power grid modelling?

Why do we have to sometimes recalculate the manufactured per unit (PU) values of model impedances of power transformers in power grid modelling?

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eren nefuworK o o uoer level and the equipment associated tooth houe lb and pae untly coe level VD even Ihe pour aid, tce neet valus cue nead to calcalate the per uni ent rid otherwise e aund Vorage bwer a erent iote ctive estipman Cannate estimatd C

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