. The Street railway journal . 347^ CROSS SECTION OF POWER STAIION To five of these engines 250-kw three-phase alternatorsare connected. These are 390-volt machines operating atthe unusual frequency of .29 cycles per second. The re-maining three engines have 250-kw double-current gener-ators, giving 650 volts on die direct-current commutator,or 390 volts at the alternating-current collector rin^s. The vices, directly to the low-tension alternating-current bus-bars. The entire alternating-current output is delivered to onebank of three delta connected step-up transformers. Theonly automatic cir
. The Street railway journal . 347^ CROSS SECTION OF POWER STAIION To five of these engines 250-kw three-phase alternatorsare connected. These are 390-volt machines operating atthe unusual frequency of .29 cycles per second. The re-maining three engines have 250-kw double-current gener-ators, giving 650 volts on die direct-current commutator,or 390 volts at the alternating-current collector rin^s. The vices, directly to the low-tension alternating-current bus-bars. The entire alternating-current output is delivered to onebank of three delta connected step-up transformers. Theonly automatic circuit breakers in connection with the low-tension switching in the station are in the three leps of the. TRAIN SHEET AND POWER DISTRIBUTION two exciters are 50-kw, 125-volt machines. These are alsoused to light the offices and shops. All the alternating-cur-rent generators are operated in parallel, and there is noprovision for other than parallel operation. Coming tothe switchboard, there are eight alternating-current gener-ator panelf,, each of which has a three-pole knife switch forbreaking the main generator circuit, a double-pole field circuit supplying these transformers. Each leg of this maincircuit has a switchboard panel, upon which a Westing-house alternating-current automatic circuit breaker with atime limit is placed. The time limit is put on these break-ers, so that in case there is a short circuit at one of the sub-stations the circuit breakers at the sub-stations will openbefore those at the main station, the idea being that fre- 488 STREET RAILW AY JOURNAL. [Vol. XX. No. 14. quently this will save shutting down the whole system bythe opening of the circuit breakers in the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
