SOLUTION

• The purpose of the Balancer is to redress the voltage on the positive and negative outer.
• Let us suppose P and Q are the armatures of 2 DC machines that are connected in series across the outers and the field being cross-connected.
• Out of balance load makes the DC machine works automatically as a motor or generator in order to compensate for voltage drop or rise.
• The balancer connected to lightly load side always work as the motor while that connected to a heavily loaded side act as the generator.
• The energy is always transferred from the lightly loaded side to the heavily loaded side.