5A28137G04西屋
DCS系統接地方式 DCS系統一般接地方式
(1) 利用電氣接地網作為DCS接地網，即與電氣接地網共地；
(2) 設DCS系統專用獨立的接地網；
(3) 設DCS專用接地網，經接地線、再接至電氣接地網；
由于第三種接地方式與第二種接地方式有較多相同處，過去，計算機或DCS系統曾經較多的采用過專用的接地網。但這種接地方式存在的缺點是：占地面積太大，投資高，電纜及接地網鋼材耗量大，距廠房有相當的距離（因不易在廠房內找到合適的位置），管理、維護、測量及查找接地極和接地線不方便，且效果不甚良好。根據實際運行表明，設置專用的DCS接地網是既困難又不安全的。如某電廠曾因接地問題，造成機組跳閘數十次。根據調查，不少電廠DCS后來改用電氣接地網接地，取得了良好的效果。
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