Thenvenin equivalent sequence networks looking into the faulted bus of a power system are given with Z1 = j0.15, Z2= j0.15, Z0 = j0.2, and E1 = 1 0 per unit. Compute the fault currents and voltages for the following faults occurring at the faulted bus:
(a) Balanced three-phase fault
(b) Single line-to-ground fault
(c) Line-line fault
(d) Double line-to-ground fault Which is the worst fault from the viewpoint of the fault current?