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Find the fault current due to a bolted-three-phase short circuit at bus 4
symmetrical three phase fault at bus 4
the fault current
the bus voltages all
the line currents all
find y bus
ysy ews in fhe Figune 1,gven the per unit bus impedance matri 20 240 0140 0200 0200 a140 02275 0175 0175 Zp 200 G175 0310 0310 0200 0175 0310 0500 20 050 N2 Condinut the yusmai hee feut sccurs at bus 4 at no lead, find The fault current 2 The bus tages and 3The line carent 1during fault...
Consider the 3-bus power system single diagram below. A bolted three phase fault occurs at bus 3. Using bus impedance matrix calculate the following: 1 j0,2 j0,5 0,3 A2 2 3 A3 j0,3 0,6 j0,2 1.1 1.2 1.3 Fault current Bus voltages Line currents during the fault.
QUESTION 1: Consider the 3-bus power system single diagram below. A bolted three phase fault occurs at bus 3. Using bus impedance matrix calculate the following: j0,2 j0,5 0,3 A2 2 3 A3 0,3 j0,6 j0,2 1.1 Fault current Bus voltages Line currents during the fault. 1.3
For a three-bus power system given below, find the fault current when a) L-G fault, b) L-L, and c) L-L-G fault occurs at Bus-3. Use pre-fault voltage of 1 p.u. Assume fault impedance is zero. All impedances in pu with respect to a common base. X+seq=j0.25 X.seq=j0.15 Xoseq=j0.10 X+seq=j0.05 X-seq=j0.05 Xoseg=j0.18 m X+seq=j0.25 X-seq=j0.15 Xoseq=j0.10 m Xneutral=jO m m3 Gen-1 Gen-2 X+seq=j0.025 X.seq=j0.025 Xoseq=j0.09 X+seq=j0.025 X-seq=j0.025 Xoseq=j0.09
Exercise 3 Consider a 2 generator 4 bus power system shown in Figure E3. The impedance data of the network in p.u. are given in Figure E3. A bolted symmetrical three phase fault occurs at bus 4. Assuming the prefault bus voltages as I p.u., calculate the fault current and the current delivered by the generators during the fault and the bus voltages during the fault. j0.12 0.05 0.16 j0.18 j0.12 0.15 0.05 j0.12 j0.1 j0.14 4 (2 Figure E3:...
Calculate the per-unit, subtransient fault currents for:
a) a bolted single line to ground short circuit from from
phase to a ground at bus 3. Also calculate the per-unit line to
ground voltages at faulted bus 3, and the line currents.
b) a bolted line to line fault from phase b to c at bus 3.
Also calculate the per-unit line to ground voltages at faulted bus
3.
c) a bolted double lime to ground from phase b to c...
2. A three-phase short circuit occurs at the bus 1 for the system shown in figure below. Neglecting prefault currents and assuming that the generator is operating at its rated voltage, determine the subtransient fault current using superposition. bus 1 bus 2 j6522 ww m AY 25 MVA 13.8 kV 15% 25 MVA 13.2/69 KV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15%