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GATE EE 2017 Set 1 — Question 54

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

Power Systems → Fault Analysis → Unsymmetrical Faults (LG, LL, LLG)

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Question

The positive, negative, and zero sequence reactances of a wye-connected synchronous generator are 0.2 pu0.2\text{ pu}, 0.2 pu0.2\text{ pu}, and 0.1 pu0.1\text{ pu}, respectively. The generator is on open circuit with a terminal voltage of 1 pu1\text{ pu}. The minimum value of the inductive reactance, in pu, required to be connected between neutral and ground so that the fault current does not exceed 3.75 pu3.75\text{ pu} if a single line to ground fault occurs at the terminals is ______ (assume fault impedance to be zero). (Give the answer up to one decimal place.)
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