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Transformer - Required kVA Rating

Required transformer kVA rating given 3-phase secondary load, voltage, power-factor and 20 % safety margin.

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Formula, assumptions, and limits

S=Pcosφ(1+m)S = \frac{P}{\cos\varphi} \cdot (1 + m)
SymbolMeaningUnit
PPActive loadkW
cosφ\cos\varphiPower factor
mmDesign margin

Source: IEC 60076 / IEC 60092-302

In short

Required transformer kVA rating given 3-phase secondary load, voltage, power-factor and 20 % safety margin.

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