[Electric engineering.] . coupling the alternating-current motor to arc-lightdynamos, and in other cases the rotary converters may beused to feed a street-railway system. A large amount of lighting is carried out, especially incities, by using the plan just described. Fig. 34 shows amotor-generator set used for transforming from three-phasealternating to three-wire direct current. The three-phasesynchronous motor A receives current from transformersafter it has been stepped down from the high-tension linethat transmits it from the central station. The motordrives the two direct-current dynamos
[Electric engineering.] . coupling the alternating-current motor to arc-lightdynamos, and in other cases the rotary converters may beused to feed a street-railway system. A large amount of lighting is carried out, especially incities, by using the plan just described. Fig. 34 shows amotor-generator set used for transforming from three-phasealternating to three-wire direct current. The three-phasesynchronous motor A receives current from transformersafter it has been stepped down from the high-tension linethat transmits it from the central station. The motordrives the two direct-current dynamos B and C, which areconnected in series and supply current to the three-wiresystem. For electric-lighting work, it has been found that the useof a synchronous motor driving direct-current generatorsgives better results than rotary converters, because theformer arrangement maintains a steadier voltage on thedirect-current side, a feature of great importance in con-nection with incandescent lighting. If the voltage supplied. § 16 ELECTRIC LIGHTING. 57
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