- Exercise 1 A Single Line To Ground Fault Occurs On The Terminals Of An 11 Kv 50 Mva Three Phase Generator With Its Neut 1 (51.11 KiB) Viewed 47 times
fault current components are obtained.
Exercise 1 A single line to ground fault occurs on the terminals of an 11 kV, 50 MVA three phase generator with its neutral solidly grounded. The sub-transient reactance of the generator is 0.22 p.u. and the negative and zero sequence reactances are 0.34 p.u. and 0.12 p.u. respectively. Determine the fault current and line to line voltages if the generator is not loaded. Assume the fault impedance as zero and 11 kV and 50 MVA as base quantities. Assume the fault occurs between the a phase and ground and positive sequence exists. 1. = Ifault.p.u. = -34.412 p.u., Ib_p.u.= 0, Icp.u. = 0 Ifault = -j11.58 kA Vad = 6.685275.44° kV, Vbc = 12.942–90° kV, Vca = 6.6852104.6° kV = Exercise 2 Solve Problem 1 above for a line to line fault between phases b and c with zero fault impedance. 1. = 0, Ib_fault_p.u. = -3.093 p.1., Ic_fault.p.u. = 3.093 p.u. 16.fault = -8.117 kA Vab = 11.5720 kV, Vbc = 0, Vca = 11.572180° kV