简述电气化区段电缆线路屏蔽地线要求。
["\u7535\u6c14\u5316\u533a\u6bb5\u7535\u7f06\u7ebf\u8def\u5c4f\u853d\u5730\u7ebf\u63094km\u95f4\u8ddd\u8bbe\u7f6e\uff0c\u63a5\u5730\u7535\u963b\u5e94\u4e0d\u5927\u4e8e4\u03a9,\u6761\u4ef6\u56f0\u96be\u65f6\u6700\u5927\u4e0d\u8d85\u8fc710\u03a9\uff0c\u5177\u5907\u8d2f\u901a\u5730\u7ebf\u6216\u7535\u6c14\u5316\u533a\u6bb5\u7684\u957f\u9014\u7535\u7f06\u3001\u5730\u533a\u7535\u7f06\u5c4f\u853d\u5730\u7ebf\u7684\u63a5\u5730\u7535\u963b\u503c\u5e94\u4e0d\u5927\u4e8e1\u03a9\uff0c\u7535\u6c14\u5316\u533a\u6bb5\u7684\u533a\u95f4\u901a\u8bdd\u67f1\u5916\u58f3\u9700\u8981\u63a5\u5730\uff0c\u5176\u63a5\u5730\u7535\u963b\u5e94\u5c0f\u4e8e50\u03a9\u3002"]