. The street railway review . ors and the rotary converter are controlled from a simpleswitchboard which stands between the rotary converter and theengines. It is interesting to note that with this power stationequipment and but one sub-station in operation it is not neces-sary to use any alternating current switching devices. The switchboard has four panels; one supports the alternating-current measuring instruments, two are direct-current generatorpanels and a fourth panel is for the control of the direct-currentend of the rotary converter. In the near future the board will June 15, 190b.] S
. The street railway review . ors and the rotary converter are controlled from a simpleswitchboard which stands between the rotary converter and theengines. It is interesting to note that with this power stationequipment and but one sub-station in operation it is not neces-sary to use any alternating current switching devices. The switchboard has four panels; one supports the alternating-current measuring instruments, two are direct-current generatorpanels and a fourth panel is for the control of the direct-currentend of the rotary converter. In the near future the board will June 15, 190b.] STREET RAILWAY REVIEW 301 be lengthened by the addition of two direct-current feeder panelsand until these are placed it is necessary to control the trolleyFeeders with the machine circuit breakers. A bracket volt-meterserves to indicate the difference of potential between the direct-current bus-bars. From the slip rings on the rotary converter three-phase, alter-nating current is led to three oil-i led transformers which step. SOUTHERN MICHIGAN RAILWAY CO. CONCRETE UNDER-CROSSING WITHTHE MICHIGAN CENTRAL R. R. up the pressure to volts for transmission to the sub-station,17!^ miles distant. The high potential wires from the secondaryside of the transformers are mounted on standard line insulatorscarried on a hardwood rack. From this rack the wires pass tothe gable of the roof and out through the end wall of the build-ing to the transmission line on the poles. A bank of lightningarresters is mounted on the end wall immediately under the out-going wires. The high-tension transmission line consists of three No. 4 hard-drawn copper wires mounted at the top of the trolley poles. Thesewires are arranged in the form of a triangle 34 in. on a side. As
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
