中压电机启动技术

中压电机在额定电压下直接启动时,电流大,会破坏电网的稳定性,导致同网的其他设备不能正常运行。介绍了几种启动方法及国外新的启动技术和中压变频器。中压变频器适合中压电机的启动,虽价格高,但性价比也高,满足软启动、频繁启动以及对电网不产生冲击的要求。

Start-up Technique of Medium-voltage Motor

It is known that when directly starting up the medium-voltage motor under the rated voltage, there comes high current which may negatively influence the stability of the electric network, and in turn, cause abnormal operation of other equipment units sharing the same network. Several methods for motor-starting and some new foreign-developed techniques for motor starting and medium-voltage transformation/regulation are introduced here in the article. It is pointed out that although it is rather expensive, the medium-voltage inverter is worth using for starting-up of the medium-voltage motor owing to the fact that it satisfies such requirements as soft start-up, frequently start-up as well as no impulse onto the electric network.