. The Street railway journal . The latter type of motor will be practically independent of volt-age fluctuations, and as the engine speed is constant, due toabsence of load fluctuations, it furnishes a very satisfactorydriving power. The writer recommends that this motor be asmall rotary converter, deriving its power from the same step-down transformers which feed the railway rotary and its direct-current side connected across the storage battery. In case offailure or interruption of the alternating current the converterwould act as a direct-current motor and the lighting and powersupply need
. The Street railway journal . The latter type of motor will be practically independent of volt-age fluctuations, and as the engine speed is constant, due toabsence of load fluctuations, it furnishes a very satisfactorydriving power. The writer recommends that this motor be asmall rotary converter, deriving its power from the same step-down transformers which feed the railway rotary and its direct-current side connected across the storage battery. In case offailure or interruption of the alternating current the converterwould act as a direct-current motor and the lighting and powersupply need not l)e interrupted. As the lighting and i)0werbusiness will be a small part of tlie total station out])ut, this. -PLAN, FRONT A.\D SIDE ELEVATIONS OF A TYPICAL SCli-STATION, FREIGHT, EXPRESS AND PASSENGER OFFICE, AND DWELLING FOR ATTENDANT vantage of tending to furnish all the current from one stationin case of an extra heavy load near that station. In conse-quence sub-stations have to be provided with larger units thanif the load were divided among two or three stations. Ontrolley roads one sometimes sees long feeder lines carried outfrom sub-stations to a point a mile or more from the stationbefore being tapped into the trolley line in order to accomplishpractically what the shunt-wound rotary does. With the latterand the fairly steady load which is insured by a battery thepower factor of the transmission line may be adjusted by handadjustment of the rotary converter shunt fields. Since the sub-stations are also to act as distributing centersfor electric ligliting and ])owcr the equipment for this purposenuist be considered. The ])Ower house current being 25 cyclesa motor generator set is a ne
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
