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  3. 8. three 6.6 kv, 12 mva, 3-phase alternators are c

8. Three 6.6 kV, 12 MVA, 3-phase alternators are connected to a common bus bars. Each...

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Electrical Engineering

8. Three 6.6 kV, 12 MVA, 3-phase alternators are connected to acommon bus bars. Each has reactance to positive sequence current of15%. The reactance to negative and zero sequence current are 75%and 30% of the positive sequence value. If an earth fault occurs onone of bus bar, determine the fault current when one of thealternator neutral is earthed through a resistance of 0.25 ohm andthe others are isolated.

9. Four identical alternators each rated for 20 MVA, 11 kV havea subtransient reactance of 16% are working in parallel. The shortcircuit level at the bus bar is.

10. A generator having a solidly grounded neutral and arte50-MVA, 30 kV has positive, negative and zero sequence reactancesof 25, 15 and 5 percent respectively. What reactance must be placedin the generator neutral to limit the fault current for a line toground fault to that for a three phase fault?

Answer & Explanation Solved by verified expert
4.3 Ratings (653 Votes)
Note When the reactances aregiven in per    See Answer
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