正反转异步电动机缺相保护误动分析

Misoperation analysis of open-phase protection for positive and negative rotation asynchronous motor

异步电动机不对称运行时出现负序电流,通过检测负序电流可以避免缺相运行,但对于正反转运行的异步电动机则无法实现有效保护,利用P241灵活的逻辑编程功能,通过内部功能的组合实现正反转缺相保护功能,保障电动机的可靠运行。

Negative sequence current comes forth when asynchronous motor operating asymmetrically,though by detecting negative sequence current can avoid open-phase operation, this method can not achieve effective protection for positive and negative rotation asynchronous motor. Using flexible logical programmable functions in P241 and combining internal functions to achieve open-phase protection for positive and negative rotation operation. This function can protect motor operating reliably.