. The Street railway journal . FIG. 18 longations of the elevator shafts, and the general arrange-ment of each is as indicated in Fig. 20. The static trans-formers with fan and ventilating apparatus and the high- FIG 21.—TRANSFORMER The step-down transform-ers will each be of , and of the air-blasttype. They will receive thecurrent at a pressure of 5000volts, and will deliver tothe rotary converters at 316 volts. Two sets of cables willbe laid across the tunnels to the secondary switchboardin the second shaft; the cables will be connected to two triple-pole Parshall switches,and
. The Street railway journal . FIG. 18 longations of the elevator shafts, and the general arrange-ment of each is as indicated in Fig. 20. The static trans-formers with fan and ventilating apparatus and the high- FIG 21.—TRANSFORMER The step-down transform-ers will each be of , and of the air-blasttype. They will receive thecurrent at a pressure of 5000volts, and will deliver tothe rotary converters at 316 volts. Two sets of cables willbe laid across the tunnels to the secondary switchboardin the second shaft; the cables will be connected to two triple-pole Parshall switches,and through them current willpass to the rotaryconverters, the connection be-ing such that either convertercan be switched on to eitherset of cables. At the MarbleArch and Post Office stationstwo rotaries are to be em-ployed, and at Notting Hilland Davies Street but FIG. 22 —CONVERTOR tension switch arrangements will becontained in one shaft, while theconverter switchboard, the rotary con-verters and the generator and feederpanels will be located in the othershaft. The other two sets of high-tensionmains will be led into the switchboard and connectedthrough triple-pole, quick-break Parshall switches to a Street FIG. 20—PLAN OF TRANSFORMER SUB-STATION The switchboard panel carrying the quick-breakswitches will also have mounted upon it ammeters for the STREET RAILWAY JOURNAL. [Vol. XIV. No. 3. transformer and converter circuits, a voltmeter connectedacross the converter bus bar, and a voltmeter for indi-cating the D. P. on the three-phase cables at the sub-sta-tion. There will also be synchronizing apparatus. On the continuous current side of the converter therewill be standard railway generator panels, through whichthe converter will be connected to the bus bars supplyingthe line; the bus bars will be connected through fourswitches
Size: 1851px × 1350px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
