A three-phase feeder (rms line voltage) carries a balanced rms line current of to a…

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Earth, Climate & Energy Physics · Electromagnetic induction and alternating-current circuits

Energy from Physics, Ch The grid with variable renewables: power flow, inertia, adequacy and electrification

Problem

33\,\mathrm{kV}

three-phase feeder (rms line voltage) carries a balanced rms line current of

400\,\mathrm{A}

to a load at power factor

0.85

lagging. ((a)) Find the three-phase real power

P

, reactive power

Q

and apparent power

S

the load takes. ((b)) Capacitors at the load correct the power factor to

1

with the real power unchanged. Find the new line current and the fraction by which the feeder's resistive loss falls.

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