Consider the three-phase system in Figure 1. From a 23kV generator bus 1 power is delivered...

 

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Consider the three-phase system in Figure 1. From a 23kV generator bus 1 power is delivered to a load of 150MW and 60Mvar at bus 3 and a load of 120MW and 60Mvar at bus 4. (a) Find the per-unit representation of the system with a power base value of 100MVA per- phase (single-phase) and phase voltage base value of 23/ V3 kV. (b) If the line voltage (at bus 4) for load 2 needs to be kept at exactly 69 kV what voltage must be maintained at the generating source at bus 1? (c) Find the real and reactive power at the generator side. 23 kV 230 kV 69 kV - j602 G BI B2 B3 В4 T, 150 MVA 150 MVA 230/69 kV Load 2:120MW + j60M var 23/230 kV Load1-150MW + j60M var X - 10% X - 10% Consider the three-phase system in Figure 1. From a 23kV generator bus 1 power is delivered to a load of 150MW and 60Mvar at bus 3 and a load of 120MW and 60Mvar at bus 4. (a) Find the per-unit representation of the system with a power base value of 100MVA per- phase (single-phase) and phase voltage base value of 23/ V3 kV. (b) If the line voltage (at bus 4) for load 2 needs to be kept at exactly 69 kV what voltage must be maintained at the generating source at bus 1? (c) Find the real and reactive power at the generator side. 23 kV 230 kV 69 kV - j602 G BI B2 B3 В4 T, 150 MVA 150 MVA 230/69 kV Load 2:120MW + j60M var 23/230 kV Load1-150MW + j60M var X - 10% X - 10%