. The Street railway journal . FIG. CURRENT TRANSFORMERS AT BUFFALO STATION. them at 10,700 volts or 21,400 volts pressure, and issues atthe pressure just mentioned. From the transformers six cables, that is, three foreach three phase circuit are carried through the wall ofthe step-down transformer house up to the main floor ofthe railway power station above. Here they are con-nected to the switchboard equipped with six knife bladeswitches, one for each cable, ammeters, etc., a field switch Decbmbbr, 1896.] STREET RAILWAY JOURNAL. 775 and two switches connecting to the main bus bars
. The Street railway journal . FIG. CURRENT TRANSFORMERS AT BUFFALO STATION. them at 10,700 volts or 21,400 volts pressure, and issues atthe pressure just mentioned. From the transformers six cables, that is, three foreach three phase circuit are carried through the wall ofthe step-down transformer house up to the main floor ofthe railway power station above. Here they are con-nected to the switchboard equipped with six knife bladeswitches, one for each cable, ammeters, etc., a field switch Decbmbbr, 1896.] STREET RAILWAY JOURNAL. 775 and two switches connecting to the main bus bars of therailway switchboard. From the board the two three pliasecircuits run to two rotary converters, each of 500 h. These converters are six pole machines and by. One third siro INSULATOR. their operation the three phase, 370 volt, alternating cur-rent is changed into direct or continuous current at a volt-age of 500 for connection to the feeder lines of the railwaycompany. The armature of the con-verter is fitted with three alternatorcollector rings on the side nearestthe switchboard, while the other car-ries a commutator similar to that ofthe ordinary direct current three phase current is broughtto the brushes and enters the ar-mature. As soon as the necessaryspeed is reached, as indicated bythe voltmeter, the main switch onthe board is closed and the directcurrent passes from the commutatorbrushes to the main buses of therailway switchboard. The convert-ers may also be started by direct cur-rent taken from the lines, and thedirect current from them can bethrown either to the board foroperation in parallel with the gen-erators now in operation in thepower house or directly to the feeders. The lightning arresters of theWirt type hav
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
