UNSYMMETRICAL FAULT CALCULATIONS - PART - 20 - SINGLE LINE TO GROUND FAULT - PROBLEM

PROBLEM

Two generators G1 and G2 are connected in parallel the rating of each generator is 25 MVA, 11kV, three-phase, 50 Hz generator has positive sequence reactance = X1 = 20%, negative sequence reactance = 10% and zero sequence reactance = 15%.

CASE – 01 – ungrounded neutral

CASE – 02 – grounded neutral

CASE – 03 – G1 is grounded and G2 is ungrounded. Calculate the fault current.