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Three loads are connected in parallel to an AC supply of 120∠0° V. The loads are...

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Electrical Engineering

Three loads are connected in parallel to an AC supplyof 120∠0° V. The loads are 40∠30° Ω, 50 - j30 Ω
and 30 + j40 Ω.
a) Draw the circuit diagram
b) Determine the amplitude and phase angle of the supply currentgraphically by constructing a
phasor diagram using a suitable scale of the load currents andsource voltage.
c) State the overall power factor using the answer from part(b).
d) Construct another phasor diagram for the system that illustratesan improved power factor to
unity.
e) Determine the VAR rating of the load required to achieve thisusing its current phasor determined
graphically from part (d). State its capacitance orinductance.
f) Draw the power triangles for the system before and after powerfactor correction.

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