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Power Electronics Design
book

Power Electronics Design

by Keith H. Sueker
April 2011
Intermediate to advanced content levelIntermediate to advanced
272 pages
6h 11m
English
Newnes
Content preview from Power Electronics Design
3.2. Circuit Simulation 43
current, 28.9 pu on the 5-kVA base. At the 50-kVA transformer, this
fault will result in 1/0.346 pu = 2.89 pu current on a 50 kVA base, and
at the 500-kVA transformer the fault is 1/3.46 = 0.289 pu on a
500-kVA base. At any point in the system, one can define a base
impedance as
Zbase
=
V
LL
2
/
VA
or
Zbase
=
V
LL
2
/(1000
×
kVA) where
VA or kVA is a three-phase rating. Then, in ohms, Zohms = Zbase Zpu
at that base. The base impedance is the impedance that, when con-
nected to each line of a three-phase system at rated voltage, will draw
rated load current and develop rated voltamperes.
It is worth the effort to develop a familiarity with the per unit sys-
tem, because it greatly eases conversations with utility engineers, ...
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Publisher Resources

ISBN: 9780750679275