谁能给我讲解一下变压器的高低压绕组电动势的相量图怎么画？ 画出此图所示三相变压器的电动势相量图，确定其联结组
\u6839\u636e\u53d8\u538b\u5668\u63a5\u7ebf\u56fe\uff0c\u753b\u51fa\u9ad8\u3001\u4f4e\u538b\u4fa7\u7535\u52a8\u52bf\u76f8\u91cf\u56fe\uff0c\u5e76\u5224\u65ad\u5176\u8fde\u63a5\u7ec41\u3001Yy4\u63a5\u7ebf\uff0c\u5411\u91cf\u56fe\u5982\u4e0b\u3002\u4e3a\u7701\u4e8b\u7bad\u5934\u672a\u753b
2\u3001\u63a5\u7ebf\u56fe\u53ca\u5411\u91cf\u56fe\u5982\u4e0b\uff1b\u63a5\u7ebf\u7ec4\u522b\u4e3aDy1
(a)\u4f4e\u538b\u4fa7\u4e09\u89d2\u7ed5\u7ec4\u4e3a\u987a\u63a5\u4e3a\uff0c\u63a5\u7ebf\u7ec4\u522b\u4e3a\uff1aY/d-1\uff0c (b)\u9ad8\u538b\u4fa7\u4e09\u89d2\u7ed5\u7ec4\u4e3a\u9006\u63a5\uff0c\u63a5\u7ebf\u7ec4\u522b\u4e3a\uff1aD/y-1
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