1. In a power system with negligible resistance, the three- phase fault current at a point is 8 pu. The series reactance to be inserted at the fault point to limit the short circuit current to 5 pu is a. 0.125 pu b. 0.333 pu c. 0.075 pu d. 0.20 pu 2. A 3-phase, 15 MVA, 10 kV alternator has internal reactance of 6& and negr1iaiblee resistance Find the external

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1. In a power system with negligible resistance, the three-
phase fault current at a point is 8 pu. The series
reactance to be inserted at the fault point to limit the
short circuit current to 5 pu is
a. 0.125 pu
b. 0.333 pu
c. 0.075 pu
d. 0.20 pu
2. A 3-phase, 15 MVA, 10 kV alternator has internal reactance
of 6s and negligible resistance. Find the external
reactance per phase to be connected in series with the
alternator so that steady current on short circuit does not
exceed 6 times the full load current.
a. 0.589n
b. 1.6720
c. 10.670
d. 0.7110
3. A 3-phase, 13.8 kV, 50 MVA alternator has positive,
negative and zero sequence of 0.20, 0.20 and 0.05 pu. If
the alternator is on no-load, determine the fault current
for a three-phase fault.
a. 10,460 A
b. 15,200 A
c. 12,200 A
d. 14,500 A
Transcribed Image Text:1. In a power system with negligible resistance, the three- phase fault current at a point is 8 pu. The series reactance to be inserted at the fault point to limit the short circuit current to 5 pu is a. 0.125 pu b. 0.333 pu c. 0.075 pu d. 0.20 pu 2. A 3-phase, 15 MVA, 10 kV alternator has internal reactance of 6s and negligible resistance. Find the external reactance per phase to be connected in series with the alternator so that steady current on short circuit does not exceed 6 times the full load current. a. 0.589n b. 1.6720 c. 10.670 d. 0.7110 3. A 3-phase, 13.8 kV, 50 MVA alternator has positive, negative and zero sequence of 0.20, 0.20 and 0.05 pu. If the alternator is on no-load, determine the fault current for a three-phase fault. a. 10,460 A b. 15,200 A c. 12,200 A d. 14,500 A
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