engineering recuitment MAHATRANSCO AE Electrical Mock Test Power Systems Fault Analysis Short Circuit Capacity
A 3 phase 100 MVA, 10 kV alternator has 5% reactance. An external reactance X per phase has to be connected in series with the alternator so that 3 phase short circuit does not exceed 8 times the full load current. The value of X is
1
0.075 ohm/phase
2
1.25 ohm/phase
3
2.5 ohm/phase
4
1.5 ohm/phase
5
1.75 ohm/phase