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Three 6.6 kV, 3−Φ, 10 MVA alternators are connected to a common bus. Each alternator has a positive, negative and zero sequence reactance as 0.15 p.u., 0.1 p.u., 0.05 p.u. respectively. A single line ground fault occurs at point F, as shown in figure below.If is the fault current when all the alternator neutrals solidly grounded. 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 |
Answer» Three 6.6 kV, 3−Φ, 10 MVA alternators are connected to a common bus. Each alternator has a positive, negative and zero sequence reactance as 0.15 p.u., 0.1 p.u., 0.05 p.u. respectively. A single line ground fault occurs at point F, as shown in figure below. If is the fault current when all the alternator neutrals solidly grounded. 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.
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