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Question: example 4 a singleline diagram of the power system is...

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Example 4 A single-line diagram of the power system is shown in Figure, where negative- and zero-sequence reactances are also given. The neutrals of the generator and Δ-Y transformers are solidly grounded. The motor neutral is grounded through a reactance X0,05 per unit on the motor base. The pre- fault voltage is 1.05 per unit, pre-fault load current is neglected and and Δ-Y transformer phase shift are neglected (a) Draw the per-unit zero-, positive-, and negative sequence networks on a 100-MVA, 13.8-kV base in the zone of the generator negative-sequence bus impedance matrices. for a bolted single line-to-ground fault current-0.15 138-kVA/138-AVYy (b) Determine the per-unit zero-, positive-, and 100 MVA 100 MVA 138-kV Y/138-kV A X-0.10 per unit (c) Find the subtransient fault current in per-unit 138 V 100MVA from phase a to ground at bus 1 and at bus 2 100 MVA 13.8 X2 . 0.17 0.05 per unit X=0.10 per unit (d) Find the per-unit ne-to-ground voltages at bus 1 and bus 2 during the single line-to- X-0.21 ground fault at bus1 010 X005 per unit 95
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