. The Street railway journal . otors of the rotary con-verters. These are of 50 k. v. a. capacity each, the bank being sulated type, with the windings placed in substantial sheet-iron cases, with cast-iron top and base. The transformationis from 12,000 volts to 400 volts. STORAGE-BATTERY EQUIPMENT As previously outlined, storage batteries are provided atIlammel sub-station only, though provision is made in thedesign of the other sub-stations for the ultimate installationof storage batteries should future conditions appear to re-(luire them. The equipment installed at Hammel sub-station, with i
. The Street railway journal . otors of the rotary con-verters. These are of 50 k. v. a. capacity each, the bank being sulated type, with the windings placed in substantial sheet-iron cases, with cast-iron top and base. The transformationis from 12,000 volts to 400 volts. STORAGE-BATTERY EQUIPMENT As previously outlined, storage batteries are provided atIlammel sub-station only, though provision is made in thedesign of the other sub-stations for the ultimate installationof storage batteries should future conditions appear to re-(luire them. The equipment installed at Hammel sub-station, with itsauxiliaries, is made up as follows: The battery itself com-prises 300 elements of the Electric Storage Battery Com-panys chloride accumulator, each element containing fifty-five type R plates, in regular service. At the temperature of70 degrees F. they have the following capacities: Rate Time Capacity 700 amp 8 hrs. 5600 amp. hrs. 1000 5 5000 1500 3 4500 3200 I 3200 The normal rating of the battery is the one hour, for which. FIG. , ROTARIES, TRANSFORMERS AND SWITCHBOARD IN IIAMMEL SUB-STATION able to start up and synchronize three 1500-kw rotary con-verters simultaneously, and are of the oil-insulated, self-cool-ing type, reducing the three-phase, 25-cycle current from 12,-000 volts to 400 volts. They are placed in a row on the mainfloor and are connected to the rotary bus by an automatic oilcircuit breaker, electrically operated from the main controlstand. At sub-station No. 5, where a storage battery is employedthat involved the use of two 162-kw booster generators, eachdriven by a 235-hp induction motor, there is provided a bankof three 200-kw air-blast transformers, affording sufficientcapacity not only for operating the battery boosters underthe maximum conditions of load, but also for simultaneouslystarting one rotary converter without dropping the secondaryvoltage of the transformers sufficiently to affect the boosterregulation. These transformers are set
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
