Three 6.6 kV, 3-ϕ, 10 MVA alternators are connected to a common bus. Each alternator has a positive negative and zero sequence reactances as 0.15 p.u., 0.1 p.u.,0.05 p.u. respectively. A single line to ground fault occurs at point F, as shown in figure below.If is the fault current when all the alternator neutrals solidy grouned I′f is the fault current when only one neutral is solidly grounded and other two neutrals are isolated. Then the value of |If−I′f|=________kA.6.512

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