noun
1. : two or more similar direct-current machines directly coupled together and connected in series across the outer conductors of a multiple-wire system of distribution for the purpose of maintaining the potentials of the intermediate wires of the system, which are connected to the junction points between the machines — called also compensator, equalizer set
2. : reactors or transformers with their wires so interconnected as to equalize the voltages between the wires of a multiple-wire alternating-current system — called also static balancer