三相异步电动机自耦变压器降压起动控制电路分析

Voltage-Drop Starting Control Circuit Analysis of Three-Phase Asynchronous Motor Autotransformer

为减小大容量三相异步电动机的起动电流,常用自耦变压器进行降压起动,然而,在实际使用过程中,却出现了自耦变压器的烧毁以及过电流导致空气开关跳闸的现象。作者在实践中对此进行了改进,消除了这种现象。

Autotransformers are always used to do voltage-drop starting to reduce starting current of large capacity three phase asynchronous motor. However, during actual application, the autotransformers are often damaged or excessive current always causes trip of the air switch. The author has done some improvement to this situation during practice and eliminated this phenomenon.