Abstract :
C. Concordia (General Electric Company, Schenectady, N. Y.): This paper presents data of considerable interest not only in connection with performance during jogging and plugging, as mentioned by the authors, but also for other applications. For example, electric-power-system load characteristics during transient voltage disturbances are of importance in determining system behavior. Since induction motors may form an appreciable part of the system load, it becomes of interest to know the response of such motors to sudden changes in terminal voltage as given, for example, in Figures 4 to 7 of the paper. Another case mentioned briefly in the paper is that of two motors on the same shaft. In this case it may be possible in transferring from the larger to the smaller motor to close the line switch on the smaller motor, when it is running considerably above its synchronous speed. The case of pole changing in a single motor is similar, but the two-motor case is emphasized here because the drive shaft for the small motor may be smaller than that for the large motor, and thus the shaft torques may be more significant.
