同步电动机的励磁保护回路设计修改

同步电动机励磁保护回路存在设计上的缺陷，在同步电动机启动时至电机转速达到亚同步时，励磁保护装置误动作而造成同步电动机退出运行，以往解决的办法是采取临时拆线，但这种做法不可靠也不安全。文中通过对其原理进行分析和研究，找到了解决问题的关键，从而提高了同步电动机运行的安全性和可靠性。

Modification of Design for Excitation Protection Loop of Synchromotors

Some shortcomings exist in the design of the excitation protection loop of synchromotors. From the starting of a synchromotor to its speeding up to subsynchronization, the synchromotor often withdraws from operation due to misoperation of excitation protection devices. The previous method is temporary disconnection; however, that is neither reliable nor safe. The key to the problem is found by analysis of the principle of the excitation protection loop, and the safety and reliability of operation of synchromotors are improved.