. The Street railway journal . m coating. The battery is connected at its positive terminal to themain positive bus of the station, and at its negative ter-minal through a motor-driven booster having a capacity of2500 amps, at 70 volts, to the ground. The functionsof this booster are various, and its construction worthy of a very ingenious switch. In the central position of the switch the at its two points of contact with the resist-ance is the same and no current flows in the shunt. Ateither of its terminal positions the shunt is actuated by thefull 550 volts, the direction of its magn
. The Street railway journal . m coating. The battery is connected at its positive terminal to themain positive bus of the station, and at its negative ter-minal through a motor-driven booster having a capacity of2500 amps, at 70 volts, to the ground. The functionsof this booster are various, and its construction worthy of a very ingenious switch. In the central position of the switch the at its two points of contact with the resist-ance is the same and no current flows in the shunt. Ateither of its terminal positions the shunt is actuated by thefull 550 volts, the direction of its magnetization dependingon the position of the switch. The booster can thus be setto either charge or discharge the battery or in the positionof neutral action by turning the switch lever on the batteryswitchboard. During a 24 hours run, the battery is fully charged bythe rotary transformers at night and is switched in forservice about 5130 A. M. The peak at 8 A. M. is taken bythe battery, which then runs practically as a regulator. 7 a /o // /£ ✓ z 3 7 6 f /o // /X / JL S 4. S~ <Z f Pepresentd D/schange 7?epr?5er?t5 Charge SAMPLE LOAD DIAGRAM of special attention. The motor end is an ordinary six-poletype of motor, working at 500 from the main bus-bars. This is direct coupled to the compound woundbooster, which has two commutators of very large size,each carrying six sets of eight brushes. By this arrange-ment currents as large as 3000 amps, have been sentthrough the booster without undue sparking. The ma-chine is provided with a center bearing and the usual self-oiling arrangements and is, as the illustration shows, ofvery solid mechanical construction. As the booster is used sometimes to assist the chargingof the cells and sometimes to help their discharge, it isnecessary to vary its terminal voltage from zero to amaximum in either direction. This is done by varyingthe at the terminals of the shunt winding by means until the evening peak comes on. At about
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
