描述
5136-PFB-VME
1997年7月原電力部召開了熱工自動化領導小組第六次擴大會，對電氣設計如何與DCS配合提出了具體意見：“實現(xiàn)爐、機、電集中管理，使電廠主控室爐、機、電控制水平協(xié)調發(fā)展是必要的而且在現(xiàn)有技術和裝備條件下是可行的，可以起到省人、省主控制室面積，便于集控值班運行的作用，而且不提高造價。領導小組要求以積極的態(tài)度加入電氣納入DCS的工程試點。”按此精神，九江電廠三期2×350MW、信陽電廠一期2×300MW、益陽電廠一期2×300MW工程電氣系統(tǒng)均納入DCS監(jiān)控?，F(xiàn)依據這幾個工程中具體實施的過程和要求，就電氣系統(tǒng)納入DCS監(jiān)控的一些有關問題進行分析和探討。電氣系統(tǒng)與熱工自動化相比在控制要求及運行過程中有著很多不同點，電氣的主要特點表現(xiàn)為：
（1）電氣設備相對熱工設備而言控制對象少，操作頻率低，有的系統(tǒng)或設備運行正常時，時常幾個月或更長時間才操作一次。
（3）300MW及以上機組一般每2臺機組共用1臺起／備變，任一機組檢修都不能影響另1臺機組的正常運行，因此DCS控制應考慮其控制方式，確保只能有1臺機組的DCS實現(xiàn)對共用部分的控制，同時另一機組DCS能夠實現(xiàn)實時監(jiān)視，并且這種操作控制權能實現(xiàn)切換。
（4）電氣設備電氣系統(tǒng)的聯(lián)鎖邏輯較簡單，但電氣設備本身操作機構復雜。
因此，機組的電氣系統(tǒng)納入DCS控制，要求控制系統(tǒng)具有很高的可靠性。除了能實現(xiàn)正常起停和運行操作外，尤其要求能夠實現(xiàn)實時顯示異常運行和事故狀態(tài)下的各種數據和狀態(tài)，并提供相應的操作指導和應急處理措施，保證電氣系統(tǒng)自動控制在最安全合理的工況下工作。
產品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務質量，
優(yōu)勢價格，大量現(xiàn)貨。
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