1 answer

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 resis

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 =

Answers

Soln Taking 10.5kV; 250 MUA base at generator side. (i) calculating line reactance Xine = 0.2 x 50=100 Z Bare = (VBase) ² UbaIL (p = 0-2 /-cos (0.8) (IL (pu) = 0.2 [-36.87 pu) (iii) Calculating pre fault voltage L j0.1 pu | j0.1033 j0-10331. Ji (pu(10) calculating sub transient thevenin reactance cet fault point (replacing woltage source with short ect) jo.1 jo 1033 jo.1I = 1.012520.94 jo.0841 If = 12.0352 L-89.06 pu Fault current If I = 12.0352 pu Bare current SB IB = 3. VB fault current in a

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