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EE 313
Example Power Problem
A source, V
S
= 150 Vrms, operating at 60 Hz is connected to three loads, all of which are
connected in parallel.
The details of the loads are given below.
Answer the following questions
about this power system.
Z
1
:
P
1
= 25 kW with PF
1
=0.5 lagging
Z
2
:
P
2
= 18 kW and Q
2
=12 kVAR
Z
3
:
I
3
=60 Arms and PF
3
= 0.75 lagging
a)
What is the impedance of each load?
b)
What is the phasor current flowing through each load?
c)
What is the real power delivered by the source?
d)
What is the complex power absorbed by each load?
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Unformatted text preview: e) What is the power factor of the combined loads? f) What is the magnitude of the source current? g) If a corrective load is added to minimize the source current magnitude, what would this magnitude be? h) Design a corrective load to make the combined power factor equal to 0.952 lagging. What is the impedance of this load? What is the element value of this new load? What is the magnitude of the source current now?...
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This note was uploaded on 07/22/2011 for the course EE 313 taught by Professor English during the Fall '09 term at University of Alabama  Huntsville.
 Fall '09
 ENGLISH

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