Compute the line voltage and Yimpedance bases at each bus Co

Compute the line voltage and Y-impedance bases at each bus. Complete the table provided. T1: 3 - Single-Phase, 100 MVA, 34 kV/66.4 kV, X_e = 8% TL23 : z bar = j0.50ohm/mi, 75 miles L3: Z_delta = 150+j10ohm, 113.0 kV System Bases: 500 MVA, 115 kV at bus 2

Solution

TRANSFORMER T1:

XC=0.08 PU

XC PU=(XC ACTUAL/XC BASE)

XC ACTUAL=XC BASE*XC PU

XC BASE AT BUS 2=(115)^2/500=26.45 OHMS

XC BASE AT BUS 1=[(34/66.4)*115]^2/(500)=6.93 OHMS

XC ACTUAL AT BUS 3=75*j0.5=37.5 kohms

xc actual at bus 1= 6.93*j0.08=0.5544 kohms

xc actual at bus 2=26.45*j0.08=2.116 kohms

BUS	VL,KV	Z,KOHMS
1	34	0.5544
2	66.4	2.116
3	113.0	37.5