System AB is connected to system BC via a 1000 MW tie-line. The total capacity of the online
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- Equipment ratings for the four-bus power system shown in Figure 7.14 are as follows: Generator G1: 500 MVA, 13.8 kV, X=0.20 per unit Generator G2: 750 MVA, 18 kV, X=0.18 per unit Generator G3: 1000 MVA, 20 kV, X=0.17 per unit Transformer T1: 500 MVA, 13.8/500YkV,X=0.12 per unit Transformer T2: 750 MVA, 18/500YkV,X=0.10 per unit Transformer T3: 1000 MVA, 20/500YkV,X=0.10 per unit A three-phase short circuit occurs at bus 1, where the prefault voltage is 525 kV. Prefault load current is neglected. Draw the positive-sequence reactance diagram in per unit on a 1000-MVA, 20-kV base in the zone of generator G3. Determine (a) the ThĂ©venin reactance in per unit at the fault, (b) the subtransient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2.In the shown below power system, both generators G1 and G2 emf’s are equal.All the system data are shown on the system diagram.a) Draw the system diagram in per unit using (MVA)base = 75 and (KV)base =20 KV in the generators side.b) Calculate the three-phase balanced short circuit current (If) at busbar 3 inAmpere and the fault level (MVA)sc in MVA.c) If the fault at busbar 3 is a line-to-line fault, calculate the fault current inAmpere and the fault level (MVA)sc in MVA.4. Calculate three phase voltages and currents at fault location and at Bus G for a phase-A to Ground (L-G) fault at bus H, for a system as shown in Figure 2. Also draw the positive, negative, zero sequence networks and their interconnection diagram for this particular fault. 90 MVA 90 MVA 132kV H 132kV Line section Source Source B 100 MVA 100 MVA 132/69 kV 10% 132/69 kV 10% Figure - 2
- The system values are given below. The bus 1 voltage after fault = 1.5 p.u The bus 2 voltage after fault = 1.2 p.u The line admittance between bus 1 and bus 2 (Y12 ) is = 0.8 p.u The post fault current current flow between bus 1 and 2 is ..............The system values are given below. The bus 1 voltage after fault =6.18 p.u. The bus 2 voltage after fault = 2.54 p.u. The line admittance between bus 1 and bus 2 (Y12 ) is =3.25 p.u Then the post fault current flows between bus 1 and 2 is Post fault current l isb) The one-line diagram for a simple power system is given in Figure 1(b). į. Draw the impedance diagram of the system. i. Construct the bus admittance matrix, Xeus and bus impedance matrix, Zous of the system. I. Evaluate the fault current, bus voltages and line current during the flow when a balanced three-phase fault occurs on bus 1. bus 1 bus 2 j65 N G G 25 MVA 25 MVA 13.8 kV 15% 13.2/69 kV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15% Figure 1(b) m
- Q1. Given Zo = 0.3L60°, Z¡ = 0.17L80° and, Z2 = 0.45L120°. Compute the fault current and voltages for a Double Line-to-Ground Fault. Note that the sequence impedances are in per- unit. This means that the solution for current and voltage will be in per-unit. [1] Note: Formulas for the reference For Double line to ground fault the positive, negative and zero sequence circuits are connected in parallel The sequence networks are interconnected, as shown in Fig. 8.9 Zo To Because the sequence currents sum to one node, it follows that Vo I, =-(I, +1,) The current I, is the voltage drop across Z, in series with the parallel combination of Z, and V, I = Z, + Z, +Z, V2 Fig 8.9Q2 Figure Q2 shows a single line diagram of a power system and the associated data of this system are given in Table Q2. The pre-fault load current and A-Y transformer phase shift are neglected. (a) (b) If a Single Line-to-Ground (S-L-G) fault occurs at Bus 5 and the pre-fault voltage is 1.0 pu, calculate the subtransient fault current in Ampere. (c) (d) (e) Using base of 100 MVA and 11 kV at generator G₁, construct the positive sequence, negative sequence and zero sequence networks with their corresponding component values indicated. G₁ Recalculate (b) if the neutral on HV side of T3 is solidly grounded. Repeat part (b) with Line-to-line (L-L) fault. What will happen to L-L fault current in (d) if the neutral on the HV side of T3 is solidly grounded? Bus 1 T₁ Bus 4 Line 1 Line 2 Figure Q2 Bus 5 T2 T3 Bus 2 Bus 3 G₂ G3Q2. Figure Q2 shows a 300 MW, 50 Hz generator transmitting 280 MW real power to an infinite bus through double transmission lines. A three-phase fault occurs at point P in the middle of one of the transmission lines. (i) Write the generator output power-angle equation per unit for pre-fault, during fault and post-fault conditions. (ii) Determine the critical clearing angle using equal criteria method E=1.05 p.u X'=j0.12 p.u X=j0.17 p.u @ Figure Q2 Xime=j0.6 p." Xime=j0.6 p.u P * V=1.0 p.u
- 5.10 The zero sequence current of a generator for line to ground fault is j2.4 p.u. Then the current through the neutral during the fault is (a) j2.4 p.u. (b) j0.8 p.u. (d) j0.24 p.u. (c) i7.2 p.u.Q-5-) 60 Hz generator supplies 0.50 Pmax power to a busbar with infinite power over a conveying line. When a fault occurs, the reactance value between the generator and the infinite bus becomes 400% times the value before the fault. When the fault is isolated, the maximum power that can be transferred generator to the endless bus is 75% of the original (initial) maximum value. Accordingly, using t area criterion method, calculate the critical clearance angle of the system. 00System AB is connected to system BC via a 1000 MW tie-line. The total capacity of the online units and the demand of system AB are 10000 MW and 8500 MW, respectively. The total capacity of the online units and the demand of system BC are 20000 MW and 17000 MW, respectively. System AB is importing 500 MW from system BC and all units operate with a common governor droop setting of 5% for both systems. All generating units are operating with sufficient spinning reserve and can respond to frequency changes. AB System capacity=10000 MW 8500 MW 9000 MW AB system load (a) (b) (c) (d) (e) T... 60.15 Hz 60.075 Hz 60.0 Hz 59.925 Hz 59.85 Hz BC system capacity = 20000 MW 500 MW 17500 MW Q34. Determine the new frequency of system AB if the tie-lie interconnecting systems AB and BC trips (a) (b) (c) (d) Q35. Determine the new frequency of system BC if the tie-lie trips 60.15 Hz 60.075 Hz 60.0 Hz 59.925 Hz 59.85 Hz 17000 MW BC system load