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Shipboard Electrical Power Systems
book

Shipboard Electrical Power Systems

by Mukund R. Patel
December 2011
Intermediate to advanced content levelIntermediate to advanced
370 pages
12h 24m
English
CRC Press
Content preview from Shipboard Electrical Power Systems
16 Shipboard Electrical Power Systems
Example 1.7
Express the time-domain circuit in Figure E1.7(a) in the phasor domain with imped-
ances in ohms. Then, determine the current phasor I
˜
and the average power.
75 μF
12 Ω 12 Ω
340 cos(314t) V
60 Hz
Ĩ
80 mH
240 V
rms
Ĩ
–j 42.46 Ω
j 25.12 Ω
(a) (b)
SOLUTION
First, the voltage phasor’s rms value = 340 ÷ √2 = 2400° V (Reference for angle).
Angular frequency ω = 314, which gives f = ω/2 π = 50 Hz.
The loop impedance of the series R-L-C circuit in (a) is
Z j
j
= +
= +
12 314 0 080
1
314 75 10
12 25 12 4
6
×
× ×
.
( . 22 46 12 17 34 21 09 55 3. ) . . .= = j ohms
The phasor-domain circuit is shown in (b), from wh ...
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Publisher Resources

ISBN: 9781439828175