. The Street railway journal . the rotary. Fig. 18 shows thepositive connections as carried through the wall to thedirect-current switchboard. It also shows the field rheostatsfor the rotaries. The busbar and switch structures are built of light-col-ored shale brick and concrete slabs. Tests showed thisbrick to be well adapted for the purpose, as they withstanda comparatively high voltage test, are acid proof and donot absorb moisture. The busbar insulators are of such adesign that the bars are free to move longitudinally, but areheld rigid at disconnecting switches. The transformers are of th
. The Street railway journal . the rotary. Fig. 18 shows thepositive connections as carried through the wall to thedirect-current switchboard. It also shows the field rheostatsfor the rotaries. The busbar and switch structures are built of light-col-ored shale brick and concrete slabs. Tests showed thisbrick to be well adapted for the purpose, as they withstanda comparatively high voltage test, are acid proof and donot absorb moisture. The busbar insulators are of such adesign that the bars are free to move longitudinally, but areheld rigid at disconnecting switches. The transformers are of the General Electric air-cooledtype and of 550-kw capacity each. A pressure of ^ maintained in the air-blast chamber by any two of thethree motor-driven Buffalo Forge Company blowers each have a capacity of 20,000 cu. ft. of airper minute. Entrance to the chamber is provided forthrough an air lock at one end, equipped with air-tight re-frigerator doors. Air for the blowers may be obtained □□□□□BHmm. FIG. 20.—PLAN AND SECTION OF NORTHERN (NO. 2) SUBSTATION view of the high-tension pit, showing the protecting doorsof asbestos. The secondaries from the transformers arerun across to the rotary converters, and the direct-currentleads continue to the switchboard near the west wall of the from outside the building through ducts provided for thepurpose, or by opening dampers in the side of the ducts itmay be taken from the station. The rotary converters rest on parallel concrete walls May 9, 1908.] STREET RAILWAY JOURNAL. 779 3 ft. 6 in. thick. The base frames of the machines arecast with square corners and with vertical sides, to providefor setting the top of the frame flush with the floor, asshown in the cross-section. The rotaries are provided withelectrical oscillators, and are started from the alternating-current side by means of 1/3 and 2/3 voltage taps on thetransformers. The two double-throw, triple-pole startingswitches for each machine are instal
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
