- Problem 1 100 Points A Three Phase Fault Takes Place At Bus 2 Use A 50 Mva 13 8 Kv Starting At Generator Assume A Pr 1 (72.08 KiB) Viewed 42 times
Problem 1 (100 points) A three-phase fault takes place at bus 2. Use a 50 MVA, 13.8 kV starting at generator Assume a pre- fault voltage of 13.80/30 kV. System is balance prior to the fault. Ignore pre-fault currents and phase shifts. Determine: 1. 11. IV. M1 Fault Current in amps at the fault Fault current in amps through breaker 1 Fault current in amps through breaker 2 Fault current in amps through breaker 3 13.8 kV 30 MVA X; - X; -0.1 Xo =0.025 1 X; - X; - 20 X₁ = X₁ = X₂ = 10 M2 13.8 kV 25 MVA X₁ X₂ -0.1 X₂ = 0.015 All equipment is Y connected and grounded 3 20. 13.8/24 KV 50 MVA Xo = 0.05 X₁ = X₂ =0.2 S. - 3V-4₂* 2₁-V²/S; le = S/V3V 24 kV 50 MVA X₁ = X₂ = 0.05 X₂ -0.01 Zan Zao (S/S) (VedVent Sper phase VI; Space= 1HP = 746 W V₁ = V3 *V, (+30° L-V3 -30° 3V₂ Ip