试述变压器中性点接地方式的分类及特点。
["\uff084\uff09\u91c7\u7528\u4e2d\u6027\u70b9\u76f4\u63a5\u63a5\u5730\u65b9\u5f0f\uff0c\u53ef\u4ee5\u964d\u4f4e\u7edd\u7f18\u7684\u6295\u8d44\u3002\u6211\u56fd110\u3001220\u3001330kV\u53ca500kV\u7cfb\u7edf\u4e2d\u6027\u70b9\u7686\u76f4\u63a5\u63a5\u5730\u3002380V\u7684\u4f4e\u538b\u7cfb\u7edf\uff0c\u4e3a\u65b9\u4fbf\u7684\u62bd\u53d6\u76f8\u7535\u538b\uff0c\u4e5f\u76f4\u63a5\u63a5\u5730\u30022\u5206"]