. The street railway review . is provided with a complete system of compressed airpiping designed for an operating pressure of 40 lb. per sq. in., buttight for 80 lb. pressure. The tank for this is 24 in. x 6 ft. Two air voltage is always available, while in order to obtain lower voltagealternating-current, step-down transformers would have to be in-stalled. The leads from the water power station to the main station aretriple-conductor, paper-insulated, lead-covered cables, three in ni;m-ber, one going to each of the three sections into which the mainstation high-tension bus bars are divided.
. The street railway review . is provided with a complete system of compressed airpiping designed for an operating pressure of 40 lb. per sq. in., buttight for 80 lb. pressure. The tank for this is 24 in. x 6 ft. Two air voltage is always available, while in order to obtain lower voltagealternating-current, step-down transformers would have to be in-stalled. The leads from the water power station to the main station aretriple-conductor, paper-insulated, lead-covered cables, three in ni;m-ber, one going to each of the three sections into which the mainstation high-tension bus bars are divided. The control switchboard for the main station is of blue Ver-mont marble and is located at the west end of the engine and gener-ator room, where there are two galleries. On the upper gallery July 20, 1904.] STREET RAILWAY REVIEW. 449 provision is made for 10 alternating-current generator panels (3now installed), 2 panels to control the a. c. side of motor-drivenexciter sets (i now installedt, 3 panels to control incoming lines. EXTERIOR VIEW MINNEArOLIS SUB-STATION. from the water power plant, i bus sectional panel, 9 outgoing linepanels (6 now installed), and 3 panels to control direct-current sideof exciter sets. On the lower gallery are the offices, and when the station iscompleted there will be installed here the bus bars, oil switchesand switchboard panels for 12 additional feeder lines, making atotal of 21 outgoing feeders, for which provision has been made. The bus bars are of copper, 4 x 2 in., and are mounted in com-partments 23^ X 12^ in. The bus bars are divided into three sections. Between adjacentsections are oil switches, with disconnecting knife switches on each The oil switches for the generator circuits extend in a line acrossthe building; behind and parallel to these is the bus-bar structure;lu-hind this and parallel to it is the second row of oil switches forthe feeder lines. .All the oil switches arc furnishedwith specially designed Kinnear rolling doors. Thi
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
