In a 3 phase, 4 wire symmetrical supply system, loads of 2 ohms, (2+j) ohms and (1-j) ohms are connected in star in L1,L2 and L3 phases. The voltages are 380/220 volts. If the neutral conductor NN’ is open-circuit, find
a) the load currents before the open-circuit
b) the potential of the load star-point with respect to earth
c) the new voltages...