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EE 313 –Design Problem Last names between AH
Fall 2010
Due Tuesday, November 23
rd
.
Accepted without penalty by November 30
th
.
A balanced, threephase, Yconnected source has a line voltage of 440 Vrms.
The source
frequency is 60 Hz.
The balanced, threephase loads have the following characteristics:
Z
y1
:
P
1
= 15 kW and Q
1
= +18 kVAR
Z
Δ
2
:

S
2
=21 kVA and PF
2
= 0.500 lagging
Z
Δ
3
:
PF
3
= 0.2 lagging and I
p3
= 25 A rms
Z
y4
: 1.67
∠
60º
Ω
1.
Determine the phasor value of each impedance and the current for each load.
2.
Determine the total line current,
I
aA
.
3.
Determine the total complex power, average power, and reactive power delivered by the
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Unformatted text preview: source to the loads. 4. What is the power factor of the three loads combined? 5. It is necessary to add a parallel load in the Δ configuration to the circuit to minimize the magnitude of the line current. The line voltage and total average power delivered by the source may not change. What are the impedance and the component value of this load? 6. What is the power factor of the additional load? 7. What is the power factor of the four loads combined?...
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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
 Frequency, Volt

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