Figure below shows a power system where load at bus 5 is fed by generators at bus 1 and bus 4. The generators are rated at 100MVA; 11 KV with subtransient reactance of 25%. The transformers are rated each at 100 MVA, 11/112 KV and have a leakage reactance of 8%. The lines have an inductance of 1 mH/phase/km. Line L1 is 100 km long while lines L2 and L3 are each of 50 km in length. 4 stituts Load For a 3-phase fault at bus 5, the fault current is equal to 2530A. What the value of the change in the fault current if the value of the base voltage is changed to .10 kV (i.e. new value/old value)

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Figure below shows a power system
where load at bus 5 is fed by
generators at bus 1 and bus 4. The
generators are rated at 100MVA; 11 KV
with subtransient reactance of 25%.
The transformers are rated each 100
MVA, 11/112 KV and have a leakage
reactance of 8%. The lines have an
inductance of 1 mH/phase/km. Line L1 is
100 km long while lines L2 and L3 are
each of 50 km in length.
Load
For a 3-phase fault at bus 5, the
fault current is equal to 2530A.
What the value of the change in
the fault current if the value of
the base voltage is changed to
.10 kV (i.e. new value/old value)
1.0426
0.9833
1.0245
1.0166
0.9751
1
Transcribed Image Text:t Figure below shows a power system where load at bus 5 is fed by generators at bus 1 and bus 4. The generators are rated at 100MVA; 11 KV with subtransient reactance of 25%. The transformers are rated each 100 MVA, 11/112 KV and have a leakage reactance of 8%. The lines have an inductance of 1 mH/phase/km. Line L1 is 100 km long while lines L2 and L3 are each of 50 km in length. Load For a 3-phase fault at bus 5, the fault current is equal to 2530A. What the value of the change in the fault current if the value of the base voltage is changed to .10 kV (i.e. new value/old value) 1.0426 0.9833 1.0245 1.0166 0.9751 1
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