Electrical Engineering? help please!

Posted on 2016-04-05 18:59:00 in Engineering by SYNDA

(i) A balanced three phase star connected source has an abc phase sequence and is feeding a delta load with Vab= 208∠30 V rms. The transmisson line and load impedances per phase are 0.2+0.4j and 27+9j respectively. 

1. Calculate the line currents and the apparent load power 

2. Calcualte the load currents(delta currents) 

3. Sketch a phasor diagram showing the line currents, the line to line source voltage and the delta load currents.

 

(ii) An industrial plant consisting primairly of electric furnance load absorbs 150KW at 0.75 power factor lagging. 

1. Compute the required KVAR rating of a shunt capacitor to improve the power factor to 0.95 lagging. 

2. Calculate the acpacitor value if the working voltage is given by V=1414.21sin(120*pi*t) volts. 

3. Calculate the resulting power factor if an induction motor rated 50KW operating rated load and at 0.85 power factor lagging is added to the plant.

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