微机主设备保护认识上的几个"误区"

由于线路保护或模拟式保护的习惯认识和对发电机或变压器绕组故障特征认识的局限性，产生了一些微机主设备保护认识上的“误区”，如利用线路保护的概念理解主设备差动保护两侧电流的相位关系，在微机主设备保护双重化的理解和实现上照搬模拟式保护的做法，不同型号的电机主保护方案互相照抄等。纠正这些不正确的认识，有助于微机主设备保护技术水平的提高。

Several Misunderstandings in Microcomputer Main Equipment Protection

Due to the habitual understanding of line protection or analog type protection and due to the limitation in identifying the fault characteristics of generator or transformer winding,there are several misunderstandings in microcomputer main equipment protection.The phase difference of bilateral currents of main equipment differential protection is understood according to the concept of line protection. The understanding and implementation of double microcomputer main equipment protection adopt the analog type protection.The main protection scheme is indiscriminatingly copied among different model generators.To clear up these misunderstandings will conduce to the improvement of microcomputer main equipment protection.