对微机型线路保护来说，为什么特别强调电压互感器的二次回路和三次回路必须分开?
["\u7b54\uff1a\u5fae\u673a\u7ebf\u8def\u4fdd\u62a4\u91c7\u7528\u81ea\u4ea73D\u3002\u5b9e\u73b0\u63a5\u5730\u65b9\u5411\u4fdd\u62a4\uff0c\u82e5\u7535\u538b\u4e92\u611f\u5668\u4e8c\u6b21\u4e0e\u4e09\u6b21\u7ed5\u7ec4\u7684\u4e2d\u6027\u7ebfN\u8def\u5171\u7528\u4e00\u7535\u7f06\u82af\u7ebf\uff0c\u5219\u5f53\u7cfb\u7edf\u53d1\u751f\u63a5\u5730\u6545\u969c\u65f6\uff0c\u7531\u7535\u538b\u4e92\u611f\u5668\u4e09\u6b21\u7ed5\u7ec4(\u901a\u5e38\u63a5\u6210\u5f00\u53e3\u4e09\u89d2)\u56de\u8def3\u73a9\u7535\u52a8\u52bf\u800c\u4ea7\u751f\u7684\u7535\u6d41\u5c06\u5728\u5171\u540c\u7684N\u56de\u8def\u4e0a\u4ea7\u751f\u538b\u964d\uff0c\u6b64\u538b\u964d\u76f4\u63a5\u53e0\u52a0\u5230\u7535\u538b\u4e92\u611f\u5668\u4e8c\u6b21\u7ed5\u7ec4\u7684\u5404\u76f8\u7535\u538b\u4e0a\uff0c\u82e5\u538b\u964d\u8f83\u9ad8\uff0c\u53ef\u80fd\u5f15\u8d77\u4fdd\u62a4\u65b9\u5411\u5224\u65ad\u9519\u8bef\uff0c\u9020\u6210\u8bef\u52a8\u6216\u62d2\u52a8\u3002"]