December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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205Fault Current Analysis
Solution:
We ignore the LV cable impedance due to its negligible length. Since the HV cable
impedance is given in ohms and the transformer impedance is given in percent,
we must convert both either in ohms or in percent. Here we arbitrarily choose to
convert the transformer impedance in ohms based on the 120-V side. Therefore,
VI Z
base base base
A====120
25 000
120
208 3
120
208
V,
,
.,
.33
0 576=
.Ω
.
Transformer impedance in ohms = Z
pu
× Z
base
= (0.01 + j0.05) × 0.576 = 0.00576 + j0.0288 Ω.
Total impedance from the generator to the 120-V load side fault = Z
cable
+ Z
trfr
= (0.002 + j0.006) + (0.00576 + j0.0288) = 0.00776 + j0.0 ...
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