施耐德 软起动器,ATS22,250A,440V,220V控制电源；ATS22C25Q
软启动的必然性
The inevitability of soft start
在工程中最常用的就是三相异步电机，在民用和工业工程电动设备中，由于其电机启动特性，这些电动机直接连接供电系统（硬启动），将会产生高达电机额定电流5－7 倍的浪涌（冲击）电流，使得供电系统和串联的开关设备过载。另一方面，直接启动，也会产生较高的峰值转矩，这种冲击不但会对驱动电动机产生冲击，而且也会使用机械装置受损；还会影响接在同一电网上其他电气设备正常工作
Three phase asynchronous motor is the most commonly used in engineering. In civil and industrial engineering electric equipment, because of its motor starting characteristics, these motors connect directly to the power supply system (hard start), and will produce surge (shock) current of up to 5-7 times the rated current of the motor, so that the power supply system and the series switch equipment will be made. Overload. On the other hand, direct startup also produces higher peak torque. This impact will not only impact the driving motor, but also be damaged by the mechanical device, and it will also affect the normal work of other electrical equipment on the same grid.