. The Street railway journal . leads arebrought out at the top of the transformer through suitablebushings. Each transformer has an overload capacity of 50 percent for two hours without undue heating. The full loadefficiency is per cent, and the quarter load efficiency cent. The height of each transformer over all is about floor, and thence to the jack switches located in the secondstory, after which they leave the building through a high-tension wire shelter bushed by glass plates, and thence to thetransmission line. Space has been provided in the step-up sub-station for six addi
. The Street railway journal . leads arebrought out at the top of the transformer through suitablebushings. Each transformer has an overload capacity of 50 percent for two hours without undue heating. The full loadefficiency is per cent, and the quarter load efficiency cent. The height of each transformer over all is about floor, and thence to the jack switches located in the secondstory, after which they leave the building through a high-tension wire shelter bushed by glass plates, and thence to thetransmission line. Space has been provided in the step-up sub-station for six additional 500-kw transformers in the future. The switchboard for the step-up station consists of twolooo-kw, 25,000-volt transformer panels, each containing hori-zontal edgewise ammeters, overload and time limit relays, oper-ating levers for three single-pole, single-throw, 27,500-voltautomatic oil switches current transformers, 2500-volt single-throw automatic oil switches, potential transformers, lightning Tar ;ind Gravul Roof. l;.ulw; .;il Battery Room. Transformer Rccm, Transverse Section. SECTIONS OF STEP-UP TRANSFORMER STATION 1X0 inches, the floor space 68 ins, x 38 ins., and the weight,without oil, 12,700 lbs. The oil weighs 3200 lbs., making thetotal weight of the transformer per kilowatt of capacity The floor space per kilowatt capacity is nearly sq. ins. Each of the 500-kw transformers is provided with four taps,giving voltages of 2000, 2050, 2100, 2150 and 2200, by means ofwhich the secondary connection can be adopted to the voltagereceived from the line and the high-tension voltage maintainedar 25,000. The transformers will also stand a voltage of 27,500on the high-tension side, which would be the result of an ap-plication of 2200 volts to the 2000-volt low tension tap. From the transformers the high-tension wires, which are Brown & Sharpe copper, three-phase, pass directly to theGeneral Electric 25,000-volt automatic oil switches, on
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
