File:The Street railway journal (1902) (14574062050).jpg

Identifier: streetrailwayjo201902newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Magnetic blow out fuses D. P.—Q. B. switches A mmeter 1). P.—4 way switch D. P.—2 way switch Voli meter Recording voltmeter,. S. P. switch Amperes 400-600600600600 100 5200200100100 252560055 1,500 REFERENCES TO LETTERS ON DIAGRAM ON OPPOSITE PAGE gear, etc., and the platforms are all coupled together so thatthe attendants can get from one engine to any other withease. The four generators at present installed were supplied bythe British Westinghouse Electric & Manufacturing Com-pany, Ltd. They each have an output of 300 kw, and arecapable of withstanding overloads of 25 per cent for two cal stokers, etc., when raising steam in the boilers previousto starting up the plant. It is also used for running anyspecially early cars or repair cars for night work on theoverhead equipment. The motor-generator was supplied byBruce, Peebles & Co., of Edinburgh, and consists of twogenerators coupled together with a flywheel weighing oneton between, and mounted on a common bedplate. The
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38 STREET RAILWAY JOURNAL. (Vol. XX. No. i. low-tension has a double-wound armature and is furnishedwith the commutator at each end. The reason for thedouble-wound armature on thisside of the apparatus is to get themaximum output of the machineand to run the set at a constantspeed. To enable the low-tension side togenerate an output of 600 amps.,at 140 volts or 84 k\v, the high-tension side requires an output of100 kw, at 500 volts running at500 r. p. m. With double-woundarmature and a pressure of 100volts supplied to the low-pressureside of the two armatures in paral-lel the set is driven from the bat-tery at a speed of 600 r. p. m., andthe high-tension side generates itsfull output of 170 amps, at 500volts or approximately 84 kw.The motor-generator can by thisarrangement always be worked atits highest efficiency without anyweakening of the fields except thesmall amount necessary to reducethe voltage on the low-tensionside, as a dynamo, from 140-100volts. The battery of accumulators,

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