The following are the answers: Autumn 2013 T1 G1 5 kV 50 MVA 5/20 kV 50…
The following are the answers:
Autumn 2013 T1 G1 5 kV 50 MVA 5/20 kV 50 MVA 20 kV 50 MVA X 0.1 p.u Figure A13 In the system shown, per-unit series equivalent impedances are shown for each element. Before a balanced 3-phase fault occurs in the location shown, the pre-fault current is at its rated value at 90 % lagging power factor flowing from generator G1 The generator is operating at full voltage. How much current in kA is flowing from generator G1 after the fault occu rs? Useful Relationships Winter 2012 In the system shown in Figure W12, the transformer is connected star-star with both star points grounded and the generator is connected in star with its star point grounded. The per unit sequence impedances of each element on a 100 MVA base are given in Table W12 Generator Transforner Transmission Line 10 kvA 100 MVA 10 kVA/ 50 kV 100 MVA Fault Figure W12 Sequence Impedances (p.u. on 100 MVA base Negative (X2) 0.2 Positive (Xi) 0.2 Zero (Xo) Generator Transformer Transmission Line 0.05 0.05 0.15 Table W12 If a three-phase fault occurs at bus 2 calculate the fault current flowing from the generator (in kA). Winter 2010 T1 G1 20 kV 100 MVA 20/38 kV 100 MVA 38 kV 100 MVA X-0.15 p.u. Figure W10 Before a balanced 3-phase fault occurs in the location shown, the pre-fault current is at 80 % of its rated value and at 95 % lagging power factor flowing from generator GI . The generator is operating at full voltage. How much current in kA is flowing from Gl after the fault occurs? Autumn 2013 22.42-76.57kA Winter 2012 Winter 2010 -7.4652-72.91kA
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