# 4. The following system delivers 40MW at 0.8 pf lagging to the grid at 110kV. In...

###### Question:

4. The following system delivers 40MW at 0.8 pf lagging to the grid at 110kV. In the middle of the line there is a zero resistance three-phase short circuit. What is the voltage at the fault location prior to the fault? Using this pre-fault voltage, calculate the three phase sub-transient short circuit current. P = 40 MW cos = 0,8ind 1 = 50 km x=0,2 12/km -0 + UN - 10,5 kV 110/10,5 kV SN 250 MVA SN 250 MVA X 180 % - 10% x'-40% x"=25% U=110 kV SS =S" 2500 MVA =

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