The one line Diagram of a power system is shown in figure the Three phase power and Line-Line rating are given below G. 80MVA, 22 kV, X = 24% G2: 68.85MVA, 21 kv, x = 22.5%. T: 90 MVA, 24/220kv, X = 1% T2: 80 M VA, 20/220 kV, x=6% Line! 121 J Line: 49 r Line ! 50 π Load: 10M var, Capacitor. Draw an impedance diag veu in Per unit and Find matrix. choose 2 oku, loo MVA, base. Tz G 0438 LI LET G2 T load

Q1 Figure 1 shows the online diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedancesincluding the load impedance in per-unit. The data are given as follows: G: 100 MVA 22 kV x= 0.18 per unitT1: 60 MVA 22/220 kVT2: 40 MVA 220/11 kVT3: 40 MVA 22/110 kVT4: 40 MVA 110/11 kVM: 66.5 MVA 10.45 kVLines 1 and 2 have series reactance’s of 48.4 and 65.43 V, respectively. Atbus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.Figure 1x =0.10 per unit x = 0.06 per unitx =0.064 per unit x= 0.08 per unit x =0.185 per unit

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High voltage engineering subject

Draw an impedance diagram for the electric power system shown in Figure 3.32 showing all impedances in per unit on a 100-MVA base. Choose 20-kV as the voltage base for generator. The three-phase power and line-line ratings are given below. G1; 90 MVA 20 kV T1: 80 MVA T2: 80 MVA 90 MVA G2: Line: Load: G₁ T₁ 38 1 20/200 kV 200/20 kV 18 kV 200 kV 200 kV Load FIGURE 3.32 One-line diagram for Problem 3.13 Line X = 9% X = 16% X = 20% X = 9% X = 120 Ω S = 48 MW + j64 Mvar T₂ 38 2 G₂

Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Zload = 500 236.87° ohm, and the transmission line's impedance is Zline = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.

Figure below shows the one line diagram of a 3-o system. By selecting a common base of 100 MVA and 22 KV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per unit. The data are given as follows: G: 100 MVA, 22 KV, X= 0.18 pu 22/220 KV, X= 0.1 pu TR1: 50 MVA, TR2: 40 MVA, 220/11 KV, X=0.06 pu Load 1: 50 MVA, 0.8 pf lag Load 2: 50 MVA, 0.8 pf lead If volt at bus 4 equal 11 KV constant value : calculate i) volt at bus 1 ii) EMF (Eg) of generator ii) Transmission line current TR1 TR2 ZTL=j80 2 G1 3. 4 Load 1 Load 2

The one-line diagram of a three-phase power system is as shown in the figure attached. Impedances are marked in per unit on a 100-MVA, 400-kv base. The load at bus 2 is S(sub 2) = 15.93 MW - j33.4 Mvar, and bus 3 is S(sub 3) = 77MW + j14 Mvar. I tis required to hold the voltage at bus 3 at 400 angle 0 degrees kV. Working in per unit, determine the voltage at buses 2 and 1.

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