Electrical Engineering Papers by Benjamin G Lamme

By Benjamin G Lamme

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Its application is limited to a few special cases. SECONDARY WITH ONLY A SINGLE CIRCUIT CLOSED The method the secondary run with a single circuit a half-speed, and with two or more circuits closed, will give full speed. But the power factor at the half -speed is very low, and the efficiency is not nearly so good as when run at full speed. This may have a few special applications. Fig 20 shows this arrangement. fourth closed FIG. 19 will give DIAGRAMMATIC ARRANGEMENT OF THE TWO POLYPHASE MOTORS CONNECTED IN TANDEM OR SERIES PARALLEL VARYING THE RESISTANCE OF THE SECONDARY The arrangement is by varying the resistance in the method was considered before when the speedThis secondary.

And A, Railway. of converter and the substations are very absence voltage factors. important W it SINGLE-PHASE RAILWAY 51 ideal also, this system possesses many allows efficient operation of large equipments at the conspeed and any torque, and also avoids For heavy railroading features.. It practically any troller troubles- which are ever present with large direct current equipments. It. advantages of this A c system are so great that possible that heavy railroading will prove to be the special ice the for is it field it.

C. should avoid some of the more important dis- variable field motor, system, the A. c. and to be advantages incident to the present D. c. railway apparatus, The system must, therefore, be single- phase. The importance The diffiof using single-phase for railway work is well known culties and complications of the trolley construction are such that several A. c. systems have been planned on the basis of single-phase supplied to the car, with converting apparatus on the car to transform to direct current, in order that the standard Such plans are attempts type of railway motors may be used the present D c.

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