# Mathcad - 05-14 - kVA kW kVAR kW Srated:= 75 kVA Problem...

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Z eqs R p j X p + a 2 R s j X s + ( 29 + = Z eqs 0.14 0.201j + = θ acos F p ( 29 = θ 36.87deg = angle is positive since leading The transformer delivers rated voltage so: V fl V srated = V fl 480V = At full load, the current is: I s S rated V fl e j θ = I s 125 93.75j + A = The primary voltage, referred to the secondary side at full load, is calculated by adding the drop across the equivalent impedance (caused by the load current) to the secondary full load voltage V referredp V fl I s Z eqs + = V referredp 478.726 38.234j + V = V referredp 480.25V = which is the no load voltage
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