IS this correct? QUESTION 1 20 A generator having a solidly grounded neutral and

Question

IS this correct?

QUESTION 1 20 A generator having a solidly grounded neutral and rated 50-MVA, 30-kV has positive, negative, and zero sequence reactances of 25, 15, and 4 percent, respectively a) What reactance must be placed in the generator neutral to limit the fault current for a bolted line-to-ground fault to that for a bolted three-phase fault? 0.1033 b) What should be the connection of a transformer to isolate zero sequence current?Delta Delta Choose your answer:( Grounded Star Grounded Star or Delta Delta)

Explanation / Answer

delta-delta connected transformer

There is no zero sequence current present in the delta-delta connection of tranfomer, because there are no return paths for these current.

As there is no return path for the zero sequence current within the line, the impedance of the circuit becomes infinite.

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