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Electrically, they are interconnected across the leads of the twowire machine and the electrical connection between the two units of the balancer set form the neutral or third wire. When one side of the system becomes loaded more than the other side, the fields of these two machines are interconnected in such a manner that the generator on the side with the lightest load becomes a motor and drives the other generator as a booster. In the event that both sides of the system are balanced both units of the balancer ''float" on the line. The unbalance is limited to the capacity of the balancer unit used.
Two Two-Wire Machines Connected Permanently in Series. The three-unit motor-generator set, as the name implies, consists of one motor direct-connected to two generators, one on either side, all being mounted on a common base. The generators are permanently connected in series. The neutral is brought out from the connection between the two generators. It can readily be seen that with such combination, each generator can be loaded to its capacity, independent of the other, thereby giving the set a maximum unbalance up to 50 per cent, of its capacity. There are two other excellent advantages of this type over a straight threewire generator. First, for any direct-current generator, for the basis of electrical comparison, it is a fundamental of design that the product of the KW. and the revolutions per minute is a constant. It is therefore evident that if instead of one large single generator.
120 K.W. -three unit set in Brunton Studios, Los Angeles, Cal.
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