. Electric railway journal . ctly to headers immediately above the motors. From theseheaders it is led through the floor and through canvas tubes tothe motor inlets. The efficiency of forced ventilation for themotors of this type of locomotive is well shown by the fol-lowing tabulated comparison of ratings: Locomotive. Continuous CapacityCovers Arranged forNormal amp at 300 volts440 amp at 400 volts400 amp at 500 volts350 amp at 550 volts Forced amp at 300 volts540 amp at 400 volts500 amp at 500 volts452 amp at 550 volts The nominal one-hour ratings with 550 vol
. Electric railway journal . ctly to headers immediately above the motors. From theseheaders it is led through the floor and through canvas tubes tothe motor inlets. The efficiency of forced ventilation for themotors of this type of locomotive is well shown by the fol-lowing tabulated comparison of ratings: Locomotive. Continuous CapacityCovers Arranged forNormal amp at 300 volts440 amp at 400 volts400 amp at 500 volts350 amp at 550 volts Forced amp at 300 volts540 amp at 400 volts500 amp at 500 volts452 amp at 550 volts The nominal one-hour ratings with 550 volts at the motors are,with natural ventilation, 724 hp, and with forced ventilation,870 hp. CONTROL EQUIPMENT The control equipment consists of a double equipment ofWestinghouse unit-switch-control apparatus. Provision is madefor three running points, with no external resistance in the cir-cuit. The motors may be operated four in series, two pairs inseries, or four in multiple. The pair of motors on each truck /hi Stucl Plate. Northern Electric Locomotive—Sectional Plan and Side Elevation not less than 246 amp at 550 volts; continuous capacity not lessthan 120 amp at 300 volts, or no amp at 400 volts, these cur-rent ratings being equivalent to the square root of the meansquare values of current under operating conditions. Using agear ratio of 17 :6o, ratio , with 36-in. wheels, the efficiencyof these motors shall not be less than 85 per cent with gearsat full load. LOCOMOTIVE PERFORMANCE (A) Based on a total locomotive weight of 80 tons. (B) The motors to be provided with adequate means ofartificial ventilation. (C) Wheels 36 in. in diameter and a gear ratio of 17:60. (D) Train resistance not to exceed lb. per ton. (E) Locomotive resistance not to exceed 6 lb. per ton. Based on the foregoing figures the quadruple motor equip-ment shall be capable of accelerating from rest a train of 750tons total weight to a speed of at the rate of on a 1 per
Size: 2271px × 1100px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidelectricrailway371911newy
