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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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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