| 摘要 |
PURPOSE:To eliminate the adverse influence of heat generated in a motor to a load at the defect protecting time by classifying the load groups driven by the motor groups into thermally stable loads and thermally unstable loads. CONSTITUTION:Hysteresis motor groups 1-1-1-n, 2-1-2-n which drive thermally stable load groups 6-1-6-n, 7-1-7-n are respectively commonly connected through switches 11-1-11-n, 14-1-14-n. A group shortcircuit type which is connected simultaneously to a power source feeder 13 through corresponding one protecting breakers 12, 15 is employed, and hysteresis motors 3, 4, 5 which drive thermally unstable loads 8, 9, 10 respectively employ individual shortcircuit protecting type which are connected to a power source feeder 13 through switches 16, 17, 18 and protecting breakers 19, 20, 21. |
