55.为防止牵引供电设备对信号设备的干扰，采取了哪些防护措施？
["(1)\u91c7\u7528\u4e0e\u6700\u5927\u7275\u5f15\u7535\u6d41\u76f8\u5339\u914d\u7684\u9ad8\u5bb9\u91cf\u627c\u6d41\u53d8\u538b\u5668\u3002(2)\u8f68\u9053\u7535\u8def\u63a5\u6536\u8f93\u5165\u7aef\u52a0\u88c5\u6297\u5e72\u6270\u9002\u914d\u5668 (\u4e0d\u540c\u7684\u4fe1\u53f7\u8bbe\u5907\u5236\u5f0f\u91c7\u7528\u7684\u9002\u914d\u5668\u4e5f\u4e0d\u540c)\uff0c\u6765\u7f13\u89e3\u51b2\u51fb\u7535\u6d41\uff0c\u51cf\u5c11\u4e0d\u5e73\u8861\u7535\u6d41\u7684\u5f71\u54cd\u3002(3)\u8f68\u9053\u7535\u8def\u53d7\u7535\u7aef \u8f68\u9053\u7ee7\u7535\u5668\u7ebf\u5708\u5e76\u63a5\u9632\u62a4\u76d2\uff0c\u4f7f\u4e4b\u6ee4\u6389\u4e0d\u5e73\u8861\u7535\u6d41\u768450 Hz\u57fa\u6ce2\u53ca\u8c10\u6ce2\u6210\u5206\uff0c\u5e76\u4fdd\u8bc1\u4fe1\u53f7\u7535\u6d41\u8870\u8017\u5f88\u5c0f\u3002(4)\u52a0 \u88c5\u590d\u793a\u7ee7\u7535\u5668\uff0c\u9632\u6b62\u8f68\u9053\u7ee7\u7535\u5668\u7684\u77ac\u95f4\u8bef\u52a8\u3002"]