Electric railway journal (1917) (14761595435)

Identifier: electricrailway501917newy (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



Text Appearing Before Image:
ies and thatsix of the cars—two sets of three in multiple—are inseries. The current of only one car would return to the Feeder Section Insuiater Fro leu (.) Rotary \fositiye YTro/ley ,© © © Negative X (9JL T 100Amp No Current 100 Amp) Rotary 100Amp 600 Amp 500 Amp C- Carassumed to be droning100 amperes Arrows indicate directionof current lOOAmp 300Amp 700Amp lOOAmp <100Amp. 300Amp 700Amp. lOOAmp. Current in rail- 3 rnre sj/stemCirrent in Rail then both rotariesare^ operating normally- ieboth trolleys positive OMAHA THREE-WIRE SYSTEM—FIG. 1—DIAGRAM OF SYSTEMSHOWING THEORETICAL CURRENT FLOW IN RAILS substation over the rail in this theoretical case. Theupper set of figures (Fig. 1) shows the current in eachsection of track with the three-wire system in opera-tion and the lower figures indicate the values that wouldobtain if both trolley sections were operating positive. The three-wire principle of distribution has been inoperation for a number of years at Los Angeles, Cal.
Text Appearing After Image:
OMAHA THREE-WIRE SYSTEM—FRONT OF SWITCHBOARD CONTROLLING REVERSED TROLLEY SECTIONS. AT RIGHT, REAR OF SWITCHBOARD SHOWING POSITIVE AND NEGATIVE TROLLEY BUSES November 10, 1917) ELECTRIC RAILWAY JOURNAL 851 (as described in the Electric Railway Journal forFeb. 26, 1916, page 395), and experiments along thisline were carried on at West Springfield, Mass., lastwinter under the supervision of the Bureau of Stand-ards. The Omaha Street Railway, after a thoroughinvestigation, decided to carry out the recommenda-tions of the bureau, and early this spring the systemwas put in operation in the Lake Street substation dis-trict. This substation is equipped with one 1000-kw.and three 750-kw. rotary converters. It was decided toutilize one of the 750-kw. rotaries as a negative ma-chine. The direct-current panel for this machine wasremoved from the other three rotary panels and placed Negative Bus