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Draw a per unit impedance diagram for the system whose one-line diagram shown in Fig.1. The three phases and line-to-line ratings are as given in the figure. Assume the load is a parallel combination of Resistance and reactance (R&X). Select a base of 100
Obtain the per unit impedance and reactance diagram of the power system shown in Figure.1 G1 : 30MVA, 10.5KV, X” = 1.6 Ω G2 : 15MVA, 6.6KV, X” = 1.2 Ω G3 : 25MVA, 6.6KV, X” = 0.56 Ω T1 (Three Phase) : 15MVA, 33/11 KV, X=15.2 Ω per phase on high tension side. T2 (Three Phase) : 15MVA, 33/6.2 KV, X=16 Ω per phase on high tension side. Transmission line = 20.5 Ω / phase Load A = 15...
G 3. Draw the reactance diagram for the power system shown in Figure.3. The ratings of generator, motor and transformers are given below. Neglect resistance and use a base of 50 MVA, 138 kV in the 40 Ohms Line :20MVA, 18 kV, X = 20% :20MVA, 18 kV, X = 20% Synchronous Motor: 30MVA 13.8Kv X = 20% 3-phase, Star-Star Transformer: 20 MVA, 138/20 kV, X= 10% 3-phase, Star-Delta Transformer: 20 MVA, 138/20 kV, X = 10% G2 y j4012...
Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is \(1 \mathrm{p}\).u.
a- Find the fault current due to a bolted- three-phase short circuit at bus \(3 .[10\) points \(]\)
b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions. \([10\) points \(]\)
3.13 A single-line diagram of a three-phase power system is shown in Fig. 3.51. The ratings of the equipment are shown below Generator G: 100 MVA, 11 kV, Xi -X2-0.20 pu, Xo -0.05 pu Generator G2 : 100 MVA, 20 kV, Xi=X2=0.25 pu, Xo=0.03 pu, X,,-0.05 pu Transformer T: 100 MVA, 11/66 kV, Xi -X2-Xo 0.06 pu Transformer T2: 100 MVA, 11/66 kV, Xi-X2 = Xo 0.06 pu Line: 100 MVA, X,-X2 = 0.15 pu, Xo = 0.65 pu A...
3) The single-line diagram of a three-phase power system is shown in Fig. 1. Equipment ratings are given as follows: G1 1,000 MVA, 15.0 kV, 20.18, o 0.07 pu G2 : 1,000 MVA. 15.0 kV, 攻=エ1 =エ2 = 0.20, ro = 0.10 pu G3 : 500 MVA, 13.8 kV. 1" = 띠 z2 = 0.15, zo 0.05 pu G4 : 750 MVA, 13.8 kV. ェd =ェ1 = 0.30, T2 = 0.40 ro = 0.10 pu Ti : 1,000 MVA. 15.0Δ/765Y...
the single-line diagram of a three-phase power system is shown in figure 9.17. equipment ratings are given as follows: The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as a base. Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 765-kV base in the zone of line 1-2. Neglect the Δ—Y. transformer phase shifts.