. The Street railway journal . e supjilied by C. H. Brown & Company, of All the electrical apparatus used in the power house and sub-stations is of the Westinghouse type. The alternators are of400-kw capacity with revolving fields, and are direct connectedto the engines. They deliver three-phase current at 390 volts,with 3000 alternations at 115 r. p. m. The generators are con-nected directly to the bus-bars, without fuse or circuit breaker,and require 115-amp. exciting current at 125 volts. One 400-kwrotary converter, revolving at 500 r. p. m., is now installed inthe power house, and a founda
. The Street railway journal . e supjilied by C. H. Brown & Company, of All the electrical apparatus used in the power house and sub-stations is of the Westinghouse type. The alternators are of400-kw capacity with revolving fields, and are direct connectedto the engines. They deliver three-phase current at 390 volts,with 3000 alternations at 115 r. p. m. The generators are con-nected directly to the bus-bars, without fuse or circuit breaker,and require 115-amp. exciting current at 125 volts. One 400-kwrotary converter, revolving at 500 r. p. m., is now installed inthe power house, and a foundation is provided for another. Atpresent it is intended to use the rotary converter in the sub-station car, which is a feature of this installation that will be(lescril)C(l in detail later on, to help out the rotary at the powerhouse, as the heaviest demands for current are expected at thispoint. This car can be run into the power house on tracks providedfor this purpose, as shown in the plan. The rotary converters IxWWWWWI. Jinnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 411 NJIIIIIII LIMlllil l|ilJlllllJ|ltJIIIJIIITriirkj Oiij \yliiO;l,i| iiorta[>le| w||yj-statif)r ?$i\\\\\\\\\\<\\\\\\^^^^^ PLAN OF POWER HOUSE Fitchburg, Mass. They consist of three pairs of cross-con-nected (18 X 36), making 115 r. p. m., and each pair direct-con-nected to a 400-kw alternator. One pair develops normally600 ihp. Compounding these engines or condensing the ex-haust was not considered advisable in this plant on account ofthe low cost of fuel and because of the extremely variable loadthat would be encountered. It was decided, however, to con-nect two engines, rather than one, to an alternator with cranks90 degs. apart, in order to obtain a more uniform turningmoment for parallel operation. A fly-wheel, 15 ft. in diameterand weighing 60,000 lbs., assists parallel operation and lessensthe shock of the engines, when, as often occurs, a 50 per centoverload is suddenly thrown on or off. Their economic per
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
