SYMMETRICAL FAULT CALCULATIONS – PART – 14 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the network shown in the figure. If the fault occurs on the bus two, calculate the per-unit fault current when Xf = 0 and Xf = j0.1 and also calculate the current contribution of generator and motor.

SYMMETRICAL FAULT CALCULATIONS – PART – 13 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM 

For the network shown in the figure. If the fault occurs on the bus three, calculate the per-unit fault current when Xf = 0 and Xf = j0.15 and also calculate the current contribution of generator and motor.

SYMMETRICAL FAULT CALCULATIONS – PART – 12 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the network shown in the figure. If the fault occurs on the bus three, calculate the per-unit fault current when Xf = 0 and Xf = j0.15.

SYMMETRICAL FAULT CALCULATIONS – PART – 11 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the network shown in the figure. If the fault occurs on the bus two, calculate the per-unit fault current when Xf = 0 and Xf = j0.15 and also calculate the current contribution by the generators G1 and G2.

SYMMETRICAL FAULT CALCULATIONS – PART – 10 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the network shown in the figure. If the fault occurs on the bus three, calculate the per-unit fault current and actual fault current.

SYMMETRICAL FAULT CALCULATIONS – PART – 09 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the network shown in the figure. If the fault occurs in the mid of the transmission line calculate the per-unit fault current and actual fault current.

SYMMETRICAL FAULT CALCULATIONS – PART – 08 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM 

For the system shown in the figure.

Calculate the fault current and short circuit MVA if three-phase a balanced fault occurs at the LV and HV side of the transformer.

SYMMETRICAL FAULT CALCULATIONS – PART – 07 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

For the system shown in the figure.

Calculate the fault current and short circuit MVA if three-phase a balanced fault occurs at the LV and HV side of the transformer. 

SYMMETRICAL FAULT CALCULATIONS – PART – 06 –APPLICATION OF THEVENIN’S THEOREM & ONE PROBLEM

PROBLEM

A 50 MVA, star connected 11kV synchronous generator is connected to a 50 MVA, 11 kV/132 kV , Delta/Star transformer, sub-transient reactance of the generator is 0.12 p.u on a 50 MVA base and the transformer reactance is 0.1 p.u reactance on the same base. The generator is unloaded when a symmetrical fault occurs at point A. Find the sub-transient symmetrical fault current on both sides of the transformer.

SYMMETRICAL FAULT CALCULATIONS – PART – 05 – CALCULATION OF FAULT CURRENT, BUS VOLTAGES AND CURRENTS & ONE PROBLEM

PROBLEM

The reactance diagram of the system shown in the figure. If a balanced three phase fault occurs at bus 2. Calculate the sub-transient current in p.u from generator 1 and in line 1-2 and bus voltages during the fault.