. The Street railway journal . 5,000 lbs. Eachlocomotive is equipped with two 80-hp induction motors, deltaconnected, of a normal speed of 720 r. p. m., rated on a tempera-ture rise of 75 degs. centigrade above the surrounding atmos-phere for ten hours run at full load. These are connected tothe axles through double reduction gearing, and when operat-ing in tandem propel the locomotive at about 3 m. p. h., whichis the towing speed selected. Either motor alone will propelthe locomotive at double this speed, but under the State lawboats cannot be towed at the higher speeds. Each locomotivecontai
. The Street railway journal . 5,000 lbs. Eachlocomotive is equipped with two 80-hp induction motors, deltaconnected, of a normal speed of 720 r. p. m., rated on a tempera-ture rise of 75 degs. centigrade above the surrounding atmos-phere for ten hours run at full load. These are connected tothe axles through double reduction gearing, and when operat-ing in tandem propel the locomotive at about 3 m. p. h., whichis the towing speed selected. Either motor alone will propelthe locomotive at double this speed, but under the State lawboats cannot be towed at the higher speeds. Each locomotivecontains three 25-kw self-cooling oil transformers, which re-duce the trolley voltage from 1170 volts or 390 volts to 200 voltsfor the motors. The motor changing switch, similar in patternto an ordinary railway controller, serves to connect the twomotors in tandem, or connect either one to the line and cut outthe other or both. When connected in tandem the stator of thefirst motor is connected to the secondary circuit of the locomo-. END OF LOCOMOTIVE, SHOWING PRIMARY SWITCHBOARD tive transformers, its rotor to the stator of the second motor,while the rotor of the second motor is closed upon a ventilatedrheostat built of iron grids. A controller, similar in form to thechanging switch, serves to vary the resistance of the rheostatin circuit and to operate the reversing switches, so that themovement of the controller handle in one direction operates thelocomotive ahead and in the other direction reverses it at themiddle position of the handle. At one end of the locomotive isa plug switchboard, by which the primary connections of the locomotive transformers are changed to suit the trolley voltagewhen passing between the high-tension and low-tension sec-tions. To facilitate this change the high-tension and low-tension trolley wires are run side by side for about 100 ft., andall four trolley wires are dead-ended, so the locomotive must bestopped and the trolleys changed from one pair of w
Size: 1776px × 1407px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
