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: 1500 MVA 20 KV x= 0.2 pu T1: 750MVA 500Y/20 delta KV x= 0.10 pu T2: 750 MVA 500Y/20 delta KV x= 0.10 pu T3: 750 MVA 500Y/20 delta KV x= 0.10 pu T4: 750 MVA 500Y/20 delta KV x=0.10 pu T5: 1500 MVA 500Y/20 delta 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 ∆ - Y transformer phase shift.
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: 1500 MVA 20 KV x= 0.2 pu
T1: 750MVA 500Y/20 delta KV x= 0.10 pu
T2: 750 MVA 500Y/20 delta KV x= 0.10 pu
T3: 750 MVA 500Y/20 delta KV x= 0.10 pu
T4: 750 MVA 500Y/20 delta KV x=0.10 pu
T5: 1500 MVA 500Y/20 delta 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 ∆ - Y transformer phase shift.
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