Question

Problem # 1: Three Phase Power [35 points] A three-phase substation bus supplies three wye-connected three phase loads that are connected in parallel through a three-phase feeder with an impedance of 0.3 30 per phase Load 1 draws 75kVA at 0.866 lagging power factor, load 2 draws 45 kW at 0.70 leading power factor and load 3 draws 20 kVAR at 0.85 lagging power factor. The line-line voltage at the load is 460V Take the load phase voltage as having a phase angle of zero degree. Determine a) Total line current flowing into the feeder [12 points (b) The line-line voltage at the three phase substation bus [12 points] (c) Determine the effective power factor of the load [5] (d) It is desired to make the substation power factor to be unity for the same loads, what is the rating of three phase capacitors in kVA that is required to be connected in parallel with the source substation. [6 points]

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Answer 1

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