GATE EE 2019 Set 1 — Question 60

NAT+2 / -0MediumUnsymmetrical Faults (LG, LL, LLG)Fault AnalysisPower SystemsSymmetrical Faults

Power Systems → Fault Analysis → Symmetrical Faults

Last updated 5 September 2026

Question

A 30 kV, 50 Hz, 50 MVA generator has the positive, negative, and zero sequence reactances of 0.25 pu, 0.15 pu, and 0.05 pu, respectively. The neutral of the generator is grounded with a reactance so that the fault current for a bolted LG fault and that of a bolted three-phase fault at the generator terminal are equal. The value of grounding reactance in ohms (round off to one decimal place) is__________.

I_{f3\phi} = \frac{E}{X_1} = \frac{1}{0.25} = 4

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I_{f3\phi} = \frac{E}{X_1} = \frac{1}{0.25} = 4

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