PC-E984-145
PC-E984-145
PC-E984-145
（3）零电压和欠电压保护
因某种原因电源电压突然消失，电动机都会停转。一旦电压恢复正常，如果电动机自行起动，往往会造成设备损坏或人身事故，也会因许多设备同时起动而造成对供电网络的过大冲击。因此，在电网电压消失时，要立即切断电源，实现零电压保护。
电源电压过分降低，会引起电动机转速下降甚至停转；在负载转距不变的情况下，电动机电流增大，造成绕组过热而损坏；电压过低还会引起一些电器释放，造成控制失常。因此，当电源电压降低允许值以下时，需要切断电源，实现欠电压保护。
起保停电路本身具有失压保护和欠压保护的功能。当电源失压或严重欠压时，接触器的衔铁自行释放，电动机停止运转。当电压恢复正常时，接触器线圈也不会自行通电，只有在操作人员再次按下起动按钮时，电动机才会起动。有的电路要求有更好的零压和欠压保护，还采用专门的欠压继电器或欠电压保护电路。
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