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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
Transformer 157
If we work in the per unit system—expressing the values in pu of their respective
base values—the voltage ratio multiplier n
2
does not apply, and the total impedance
looking from the HV or LV side is merely the sum of all pu impedances, that is.
Z
Total.pu
= Z
HVcable.pu
+ Z
LVcable.pu
+ Z
Load.pu
and I
pu
= V
pu
÷ Z
Total.pu
(6.13)
At full 100% primary voltage, in per unit system, I
pu
= 1.0 ÷ Z
Total.pu
(6.14)
In amperes, I
HVamp
= I
pu
× I
HVbase
and I
LVamp
= I
pu
× I
LVbase
(6.15)
Example 6.9
Consider a transformer rated 15 kVA, 1-phase, 480/120 V supplying 9.6 Ω
load as shown in the figure below (top). In calcula ...
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Publisher Resources

ISBN: 9781439828175