A method of regulating the voltages on the two sides of a three-wire D.C. system equalized by static balancers

The merits of the static balancer are compared with those of rotary balancers, the chief disadvantage of the former being that the voltage on the two sides of the three-wire system cannot be regulated without the aid of a mid-wire booster. An arrangement is described whereby this disadvantage can be overcome by the use of tappings other than the central point of the winding of the balancer, rectifying the voltage between these tappings and the central point, and inserting the rectified E. M. F. into the side of the system the voltage of which it is required to raise.