. The street railway review . OUTH CHICAGO CITY RAILWAY. 106 ^lJiM%iiu^%^ACW* nected in parallel and the three in series with the main busbar. The switchboard has two positive bus bars, one o{which is at the station potential, 550 volts, and the other atthe potential at the boosters. As may be seen in Fig. 8,each generator and feeder panel, on the switchboard, has atwo-way switch which can be thrown on either bus equalizing circuit connects the three series field wind-ings but does not extend to the switchboard. With the shunt windings cut out of circuit the voltage a 150-h. p. 550-volt
. The street railway review . OUTH CHICAGO CITY RAILWAY. 106 ^lJiM%iiu^%^ACW* nected in parallel and the three in series with the main busbar. The switchboard has two positive bus bars, one o{which is at the station potential, 550 volts, and the other atthe potential at the boosters. As may be seen in Fig. 8,each generator and feeder panel, on the switchboard, has atwo-way switch which can be thrown on either bus equalizing circuit connects the three series field wind-ings but does not extend to the switchboard. With the shunt windings cut out of circuit the voltage a 150-h. p. 550-volt multipolar shunt-wound motor. Theboosters are each capable of delivering 400 amperes at 125volts and the voltage ranges downward with the 25 per cent overload can be maintained for an hour. Anautomatic cut-out is provided for each booster when thecircuit to the motor is broken so as to prevent the boostersrunning as series motors. Fig. 9 is from a photograph inthe station showing the boosters. Either one or both of. ■.;.. -^Jo 5hLinr Field%..-J. •y^from flcror■ ^a\ ■•, ■■■■ 50^ tn Code,,SowWcficme M$!;or_ 3?ijy^ FIG. 10.—SWITCHBOARD CONNECTIONS FOR BOOSTER. was boosted 150 volts but this was not sufficient. Theshunt field was cut in and rheostats used to regulate theexcitation. By this arrangement the potential was boosted300 volts. At first there was some difficulty with thishigh voltage on some of the feeders as the current returnedto the generator, but this was remedied by proper regula-tion. When it is necessary to run the boosters, the engineis started, the booster circuit connected to the high potentialbus bar, the feeder circuit breaker is opened, the two-wayswitch thrown on the high potential bus bar and the feederswitch closed. The switchboard connections are shown inFig. 8A, and a diagram of the feeder lines in Fig. 8B. The boosters installed by the South Chicago City Rail-way Company at its central power house were for the pur-pose of g
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
