. Electric trains . rallel control, and serves to improvethe efficiency during starting, since the rheostatic loss during the Z9U 240 220 200 ^ 160 ^ I<a0 I \ \ L V \ JOO60604020 V \ V s ZO 40 eO 80/00/20 /-A? 77/na /n Seconds Fig. 67.—Current Input to each Motor for the Run indicated in Fig. 66. first 7*5 seconds would be much greater were the entire eight motorsall in parallel from the start. The average current to each motor being approximately constantduring the first 15 seconds, it follows that the total current suppliedto the train while the motors are in series must be half that supp
. Electric trains . rallel control, and serves to improvethe efficiency during starting, since the rheostatic loss during the Z9U 240 220 200 ^ 160 ^ I<a0 I \ \ L V \ JOO60604020 V \ V s ZO 40 eO 80/00/20 /-A? 77/na /n Seconds Fig. 67.—Current Input to each Motor for the Run indicated in Fig. 66. first 7*5 seconds would be much greater were the entire eight motorsall in parallel from the start. The average current to each motor being approximately constantduring the first 15 seconds, it follows that the total current suppliedto the train while the motors are in series must be half that suppliedwhen the motors are in parallel. We can therefore set down theaverage current input to the train at (246 X 8 =)1968 ampereswhile the motors are in parallel, and 984 amperes while they are inseries. When the motors are running on the motor curve, connectedright across the 600-volt line without rheostats in circuit, the currentinput to the train is, of course, eight times that to each motor. The POWER CURVES 139. yari^h/e /fe^/sC^nce cut oi/tat ^ Sdar^ tYheAConnecdions aire ch^inged ^ Fig. 68.—Representation of Series Arrangement of the|8 Motors on the Train.
Size: 1207px × 2070px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
