. Electric railway journal . 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
. Electric railway journal . 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 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. 9 Feeder Panel? A fe=4 <is=4 ®=i Rotary V Voltmeter !j4* Ammeter Ay Ammeter and shunt ^panels mth 0Jsnitches,have $ero center instruments He-Receptacle. 750Xrr Rotaryh\Rotary ■Irack and insulated negative feeders connected to this bus OMAHA THREE-WIRE SYSTEM—FIG. 2—DIAGRAM OF CONNEC-TIONS IN LAKE STREET SUBSTATION, OMAHA at the opposite end of the switchboard in order to re-duce the danger of short-circuit between two machinesworking in series, and to simplify the bus construction. Alterations and Electrical Connections forThree-Wire System - One side of the rotary is permanently connected tothe track circuit (Fig. 2) and the other side to the -direct-current rotary panel, and connection made thenceto the middle point of a single-pole double-throw switch,which can be thrown to either the positive or thenegative bus. The voltmeter for this machine is asingle-scale instrument, and is -connected to two recep-tacles located to the left of the. large doubles-throwswitch. When the
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