我国电力系统中中性点接地方式有几种? 它们对继电保护的原则要求是什么?
["\u7b54: \u6211\u56fd\u7535\u529b\u7cfb\u7edf\u4e2d\u6027\u70b9\u63a5\u5730\u65b9\u5f0f\u6709\u4e09\u79cd: \u2460\u4e2d\u6027\u70b9\u76f4\u63a5\u63a5\u5730\u65b9\u5f0f; \u2461\u4e2d\u6027\u70b9\u7ecf\u6d88\u5f27\u7ebf\n\u5708\u63a5\u5730\u65b9\u5f0f; \u2462\u4e2d\u6027\u70b9\u4e0d\u63a5\u5730\u65b9\u5f0f\u3002\n110k V \u53ca\u4ee5\u4e0a\u7535\u7f51\u7684\u4e2d\u6027\u70b9\u5747\u91c7\u7528\u7b2c\u2460\u79cd\u63a5\u5730\u65b9\u5f0f\u3002\u5728\u8fd9\u79cd\u7cfb\u7edf\u4e2d, \u53d1\u751f\u5355\u76f8\u63a5\u5730\u6545\u969c\n\u65f6\u63a5\u5730\u77ed\u8def\u7535\u6d41\u5f88\u5927, \u6545\u79f0\u5176\u4e3a\u5927\u63a5\u5730\u7535\u6d41\u7cfb\u7edf\u3002\u5728\u5927\u63a5\u5730\u7535\u6d41\u7cfb\u7edf\u4e2d\u53d1\u751f\u5355\u76f8\u63a5\u5730\u6545\u969c\u7684\n\u6982\u7387\u8f83\u9ad8, \u53ef\u5360\u603b\u77ed\u8def\u6545\u969c\u768470 % \u5de6\u53f3, \u56e0\u6b64\u8981\u6c42\u5176\u63a5\u5730\u4fdd\u62a4\u80fd\u7075\u654f\u3001\u53ef\u9760\u3001\u5feb\u901f\u5730\u5207\u9664\n\u63a5\u5730\u77ed\u8def\u6545\u969c, \u4ee5\u514d\u5371\u53ca\u7535\u6c14\u8bbe\u5907\u7684\u5b89\u5168\u3002\n3\uff5e35k V \u7535\u7f51\u7684\u4e2d\u6027\u70b9\u91c7\u7528\u7b2c\u2461\u6216\u7b2c\u2462\u79cd\u63a5\u5730\u65b9\u5f0f\u3002\u5728\u8fd9\u79cd\u7cfb\u7edf\u4e2d, \u53d1\u751f\u5355\u76f8\u63a5\u5730\u6545\u969c\n\u65f6\u63a5\u5730\u77ed\u8def\u7535\u6d41\u5f88\u5c0f, \u6545\u79f0\u5176\u4e3a\u5c0f\u63a5\u5730\u7535\u6d41\u7cfb\u7edf\u3002\u5728\u5c0f\u63a5\u5730\u7535\u6d41\u7cfb\u7edf\u4e2d\u53d1\u751f\u5355\u76f8\u63a5\u5730\u6545\u969c\n\u65f6, \u5e76\u4e0d\u7834\u574f\u7cfb\u7edf\u7ebf\u7535\u538b\u7684\u5bf9\u79f0\u6027, \u7cfb\u7edf\u8fd8\u53ef\u7ee7\u7eed\u8fd0\u884c1\uff5e2h\u3002\u540c\u65f6, \u7edd\u7f18\u76d1\u5bdf\u88c5\u7f6e\u53d1\u51fa\u65e0\n\u9009\u62e9\u6027\u4fe1\u53f7, \u53ef\u7531\u503c\u73ed\u4eba\u5458\u91c7\u53d6\u63aa\u65bd\u52a0\u4ee5\u6d88\u9664\u3002\u53ea\u6709\u5728\u7279\u6b8a\u60c5\u51b5\u6216\u7535\u7f51\u6bd4\u8f83\u590d\u6742\u3001\u63a5\u5730\u7535\u6d41\n\u6bd4\u8f83\u5927\u65f6, \u6839\u636e\u6280\u672f\u4fdd\u5b89\u6761\u4ef6, \u624d\u88c5\u8bbe\u6709\u9009\u62e9\u6027\u7684\u63a5\u5730\u4fdd\u62a4, \u52a8\u4f5c\u4e8e\u4fe1\u53f7\u6216\u8df3\u95f8\u3002\u6240\u4ee5, \u5c0f\n\u63a5\u5730\u7535\u6d41\u7cfb\u7edf\u7684\u63a5\u5730\u4fdd\u62a4\u5e26\u6709\u5f88\u5927\u7684\u7279\u6b8a\u6027\u3002"]