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A balanced Y-connected voltage source is applied to a balanced A-connected load with Zad (45-j30) ohm/phase connected, 150 kVA transformer. According to the rating of the transformer, which is on a reactance of the transformer is j0.8 per unit (ignore the magnetizing branch impedances) LOAD 13.2kV 480V Z j0.8 pu a) Utilizing a three-phase Stue of 100 kVA and transformer voltages as bases, draw the single phase b) What does the voltage (V) at the source to need to be to ensure the voltage across system showing all per unit impedances. the load is not lower than 0.95 per unit when delivering rated current at 100 kVA and a power factor of 1.0.

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Ansues Given thot A bolanced yconnected Voltage Sousces pplied to a balanced Icad 150とVA given Vsousce Pers phase 1621 3 a13. 2 k Ota JO Con base SokvA baSe value s 5ok VA 13.2 k 13.2k し50 13-2R2 Neco s0 4264 ew Cb) Load convest ng toy load -45-33o 3 J10 (ygo 23 255 )Ansues Given thot A bolanced yconnected Voltage Sousces pplied to a balanced Icad 150とVA given Vsousce Pers phase 1621 3 a13. 2 k Ota JO Con base SokvA baSe value s 5ok VA 13.2 k 13.2k し50 13-2R2 Neco s0 4264 ew Cb) Load convest ng toy load -45-33o 3 J10 (ygo 23 255 )133 IPU 3125-12.เว t,01334 3-225-32 3レ 0 2613 131 56 P SOENB 218 A o .36 1 x 2,127

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