. Electric railway journal . , lighting, compressor and heating circuits. Themain low-tension coil is grounded and also has an auto-matic cut-out to prevent abnormally high potentials. Themotormans cab contains an oil switch which has one con-nection on each side to a grounding switch. When thedoor of the high-tension compartment is opened this switchimmediately grounds all apparatus therein through a cop-per bar which is connected to the metal car framing. The motor current travels from the main transformer 9oo ELECTRIC RAILWAY JOURNAL. [Vol. XXXIV. No. 16. through certain contactors and safe
. Electric railway journal . , lighting, compressor and heating circuits. Themain low-tension coil is grounded and also has an auto-matic cut-out to prevent abnormally high potentials. Themotormans cab contains an oil switch which has one con-nection on each side to a grounding switch. When thedoor of the high-tension compartment is opened this switchimmediately grounds all apparatus therein through a cop-per bar which is connected to the metal car framing. The motor current travels from the main transformer 9oo ELECTRIC RAILWAY JOURNAL. [Vol. XXXIV. No. 16. through certain contactors and safety devices to the leadsof the stator winding, from whence it proceeds in order tothe exciter transformers, to the motor separating switches,and thence to another group of contactors, where the cir-cuits are united hefore they return to the transformer. Abranch of the motor current is conducted to the voltageselector. The exciter current goes from the exciter trans-formers to the reversers, from which it passes to the exciter. With the 300-volt trolley potential in use, the controllercan be operated only on the first and second running pointsas follows: The low-tension current on leaving the col-lector passes through a separating switch, cable connection-box, main fuse, voltage changer, contactor and motor sep-arating switches to the exciter transformers. Thence thecurrent goes to the motor connections of the stator wind-ings, motor fuses and through a contactor set for the firstand second positions to the voltage changer to ground. As previously mentioned, the auxiliary circuits are sup-plied from a separate low-tension coil of the main trans-former when the high-tension trolley is in service. Oneend of this coil is grounded and the other, or 300-volt end,joined to the voltage changer, from which it branches intocircuits for compressors, control and light, all of which arefused in a box under the car body. From this fuse boxtwo feeder cables are led to the low-tension panels in
Size: 1557px × 1604px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
