T1 T2 X145 х1 Xt2 G, (5) Тз T4 Xg2 Xgl XL68 XL78 38 Хз X+4 х,5 Xm Figure 2: Problem 5: One-line diagram
5) Consider the one-line diagram of the power system shown in Fig. 2. Equipment nameplate ratings
are:
G1 : 750 MVA; 18 kV; x = 0:2 pu
G2 : 750 MVA; 18 kV; x = 0:2 pu
M : 1; 500 MVA; 20 kV; x = 0:2 pu
T1 : 750 MVA; 500Y=20Δ kV; x = 0:10 pu
T2 : 750 MVA; 500Y=20Δ kV; x = 0:10 pu
T3 : 750 MVA; 500Y=20Δ kV; x = 0:10 pu
T4 : 750 MVA; 500Y=20Δ kV; x = 0:10 pu
T5 : 1; 500 MVA; 500Y=20Y kV; x = 0:10 pu
500 kV transmission lines have following reactances in Ohms
XL45 = 40 Ω XL68 = XL78 = 25 Ω All per-unit reactance values are on the respective equipment rating (voltage and power) as the base. Determine the per-unit reactances on the system base and draw the equivalent reactance diagram. Use the base of 100 MVA and 500 kV for the 40 Ω line. Neglect Δ?Y transformer phase shift.
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