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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
26 Shipboard Electrical Power Systems
The line-to-line voltage is obviously the same as the phase voltages, that is, V
LL
= V
ph
Three-phase power P
3-ph
= 3 × P
1ϕ
= 3 × V
ph
× I
ph
× pf = 3 × V
LL
× (I
L
/3) × pf
P
3-ph
= 3 V
LL
I
L
pf watts and S
3-ph
= 3 V
LL
I
L
volt-amperes (1.30)
Note that the expression for 3-phase power works out to be the same in both Y and ∆.
In a 3-phase, 4-wire, Y-connected system, the neutral current is the sum of three
line currents. In a balanced Y system, the current in the neutral wire (if used) is
always zero, because it is the phasor sum of three equal line currents out of phase by
120° from each other. For this
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Publisher Resources

ISBN: 9781439828175