Highights are given to the phase protecating device with inter-lock mechanism. some practical phase protecting devices are introduced, thus reducing the accidents and economic loss duce to failure of.

• 强调应为纺机电气设备装设断相保护联锁装置，并介绍了几种实用的断相保护技术；以上技术的应用将有利于安全生产，减少因断相造成的事故和经济损失。