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d) Why are voltage and apparent power (or VA) taken as the primary bases in 4 developing per-unit (pu) systems? What rules must be followed in the selection of a base voltage V) and a base apparent power (Sb) in a system involving transformers? e) A power system is shown in Figure Q4 (e). Use the per-unit method (2 MVA 6 as the base power) to calculate the actual value of sending-end voltage Vs, when a load of 1 MVA, 0.8 power factor is supplied at 400 V. 10 MVA Transformer 2 MVA Transformer C0 Load MVA 0.8 pf lag Vs o CD 33 kV/11 kV j 10.89 Ω at 33 kV 0.1 pu 11 kV/400 V j6.05 2 at 11 kV 0.1 pu Total Figure Q4 (e)

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