Graphic from page content 294 of “Cassier’s article” (1891)

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Image from page 294 of “Cassier’s magazine” (1891)
 Three-Phase Transformer
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Identifier: cassiersmagaz401911newy
Title: Cassier’s magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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IUTTE SUBSTATION, SHOWING ELECTROLYTIC LIGHTNING ARRESTERS framed structure with concrete floorsand roof. There are installed at presentfour banks of single-phase trans-formers, rated at 3,600 kilowatts perbank and connected in delta on bothhigh and low-tension sides. Theystep the voltage down from 102,000to 2,500, at which voltage it is dis- tributed to customers. The trans-formers are installed in fireproofcompartments, entirely shut off fromthe rest of the building by brickwalls and opening only out of doors.The transformers are mounted onwheels, and can readily be run outonto a flat car, which stands on atrack running parallel with the build-

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INTERIOR OF BUTTE SUBSTATION, SHOWING SPECIAL BUSBAR CONSTRUCTION 284 CASSIERS MAGAZINE ing in front of the row of trans-former compartments. This arrange-ment furnishes a convenient methodof handling the transformers, bothat the time of installation and after-ward, in case it is necessary to makerepairs. On the gallery above the trans-former compartments are located theelectrolytic lightning arresters. Onthe gallery opposite are the 100,000-volt line switches. Possibly the mostunique feature of the electrical lay-out is the 100,000-volt bus construc-tion. For flexibility in switchingduplicate busses are provided. Thebusses themselves are made of 1^2-inch iron pipe suspended by stand-ard line insulators from the rooftrusses of the building. The threeconductors of each three-phase busare suspended one above another,each being supported by the next oneabove. The connections to the linesare also of iron pipe, making the busstructure as a whole quite rigid andwell adapted to the use of su

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Image from page 279 of “Electric railway gazette” (1895)
 Three-Phase Transformer
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Identifier: electricrailwayg13newy
Title: Electric railway gazette
Year: 1895 (1890s)
Authors:
Subjects: Electric railroads
Publisher: New York : [W.J. Johnston Co.]
Contributing Library: MIT Libraries
Digitizing Sponsor: MIT Libraries

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40-ton electrical locomotive used as a switchingengine in and around the Taftville Mills. The next plantof the kind is to be found at Sacramento, Cal., wherecurrent is brought at 11, 000 volts from the water-driven verter, emerging upon the feeder and trolley lines a directcurrent of 500 volts. The three-phase generating plant is located in the power-house of the Lowell & Suburban system, situated on Mid-dlesex Street. It consists of three four-pole, 12-okw,900 revolutions, three-phase generators, each of which is 268 ELECTRIC RAILWAY GAZETTE. Vol. XIII. No. IS. constructed to deliver alternating current at one sideand direct current at the other. The direct currentis called into action only after the main power plant,consisting of six General Electric M. P. 200-kw belt-driven railway generators, is shut down. The three-phasegenerators are compact machines, and are connectedby belts to a jack shaft which runs the entire length ofthe engine room close to the west wall. This shaft-

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ONE OF THE SUB-STATIONS. inghas been arranged to permit, by means of clutches, anycombination of engines and generators. The generatorsare rated at 216 amperes. The three-phase current issuesat a pressure of 360 volts, and is carried to the switch-board—from which it passes to a bank of transformers,erected on a platform, placed in the cellar of the stationand set between two of the engine foundations. Thesetransformers are of the General Electric air-blast type. cables to a short distance outside the city limits, where itpasses to the ordinary three-phase wires which run alongthe highway upon the same poles that carry the direct-current feeders. The three-phase wires are carried uponheavy wide petticoated glass insulators, set upon the sideof the cross arm nearer the road ; while the direct-currentfeeder cables occupy that part of the cross arm on theother side of the pole. About six miles from Lowell, and a mile and a half fromLakeview, at a place called Eayrs Mills, upon the bank

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