File:Electric railway journal (1914) (14575107788).jpg

Identifier: electricrailway431914newy (find matches)
Title: Electric railway journal
Year: 1908 (1900s)
Authors:
Subjects: Electric railroads
Publisher: (New York) McGraw Hill Pub. Co
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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breakers, control switchboard,etc., are placed in galleries at one side of the turbineroom and in the small bay already referred to. Thehigh-tension busbars, which are in duplicate, are hungdirectly from the roof, and a row of disconnectingswitches is mounted just below them, a switch as wellas a circuit-breaker being in each line on the line sideand on the transformer side. The line and transformercircuit-breakers are on the upper gallery, and all con-necting wires are No. 0000 hard-drawn trolley wire,which is of sufficient stiffness to avoid the necessity ofmany supports. On the lower or main floor under thegallery are the generator circuit-breakers, the main andservice transformers, the service circuit-breaker struc-ture, the storage battery for switch operation, the oilstorage, cleaning and drying equipment and auxiliaries. The feeder bay, referred to before, has two floors, thelower of which contains the superintendents office andthe control switchboard. The switchboard is of the
Text Appearing After Image:
Salmon River Power Development—Plan of Power House Excitation for each generator is furnished by a sepa-rate directly connected shunt-wound exciter, each gen-erator requiring from 125 amp and 125 volts at no load,normal voltage, to 235 amp and 245 volts at 7500 kvaand 7500 volts. The exciter is adapted to voltage andpower-factor control by the Tirrill regulator. The main transformers are water-cooled, and each setof three is star-connected on the high-tension and delta-connected on the low-tension side. Like the generators,the transformers are designed for high efficiency atlight load, the full-load copper loss being 30.8 kw andthe core loss 16.7 kw. The specified regulation is 1.55per cent at full load and 100 per cent power factor, and4.15 per cent at 85 per cent power factor. The transformer cases are mounted on flangedwheels rolling on tracks, this mounting permitting thebringing of the transformers into the field of the crane.The usual provisions are made to drain the cases of

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