The function of neutral wire in the 3-phase 4-wire system is to serve as a return wire for the general domestic supply system. The neutral is paired with each of the single-phase loads. The potential of the neutral point can be very well understood from the following Figure. In the above diagram, the alternator is connected to. Balancing of phases means the distribution of single-phase lighting loads equally on 3-phase 4-wire supply line conductors so that the line currents on all the phases are. Very little voltage between the neutral and the earth may exist as the neutral is solidly connected to the earth at the sub-station and it may rise if the. When the neutral wire in a 3-phase, 4-wire system is disconnected, the loads that are connected between any two line conductors and the neutral are get connected in series and. The purpose of earthing of neutral is shown in Figure. In Figure 3, an 11 kV / 230 V transformer is fed from an 11 kV line is shown. The secondary of this transformer is not earthed.
