. The Street railway journal . ibution was changed tothe three-wire system with 1000 volts across the outers, the run-ning rail forming the middle wire. There are two sub-stations,one at London Bridge, 2j4 miles from Stockwell, and the otherat the Angel, 5% miles from the generating station. These sub-stations are fed from Stockwell on practically a five-wire system,i. e., 2000 volts across the outers. A particular feature of the sys-tem is, that although distribution is effected at 2000 volts, themaximum voltage across any one commutator is 500 volts andonly half of the electrical energy sent
. The Street railway journal . ibution was changed tothe three-wire system with 1000 volts across the outers, the run-ning rail forming the middle wire. There are two sub-stations,one at London Bridge, 2j4 miles from Stockwell, and the otherat the Angel, 5% miles from the generating station. These sub-stations are fed from Stockwell on practically a five-wire system,i. e., 2000 volts across the outers. A particular feature of the sys-tem is, that although distribution is effected at 2000 volts, themaximum voltage across any one commutator is 500 volts andonly half of the electrical energy sent to the sub-stations is trans-formed, and thus a high efficiency is maintained. One or two novel points had to be settled before installing thesystem. In the first place, there had been the problem of get-ting from the negative to the positive side, and several automaticdevices had been considered, but the way out of the difficulty hadfinally resolved itself into a simple break of 30 ft. in the working Outside Feeder,4 1 Volts. Street lludioaj Journal FIG. I.—DIAGRAM OF DISTRIBUTION SYSTEM, CITY & SOUTHLONDON RAILWAY conductor at the crossings. That had given rather a nickeringlight in the train, but the break had been reduced afterward to15 ft. by putting conductors in the middle and a fuse between, sothat if, by any chance, two locomotives were crossing and causeda short circuit, the middle piece would become disconnected fromthe main conductor. Another question decided had been whethertwo machines should be used at 500 volts, one on each side ofthe system, or 1000-volt machines across the outers, with smallermachines for balancing. Many things had pointed to the use ofgenerators working at 1000 volts, but one point that had seemedto be very important was that a bad short circuit, such as mightbe caused by a car running off the road and directly connectingthe third-rail to the ordinary running rail, might raise the pres-sure to 1000 volts between the running rail and the wo
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
