A balanced 3-phase circuit with wye connected source supplies a delta connected load trough a short transmission

line. The line to line voltages of the load are 12.47kV.

Select the phase line-to natural load voltage as reference voltage (phase angle =0 )

-The delta connected load P=450kW  pf = 0.8 lag

-the short transmission line impedance is Z=2.2+j6.8

a) Draw a detailed circuit diagram and analyze

b) calculate the delta connected load complex power and  load current on phase ab

c) Calculate the supply and transmission line current on phase ab

D) Calculate necessary supply voltage phase “a”  and  total supply apparent power

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