OVATION系統DCS卡件 Westinghouse 1C31194G03 Ovation Control Module
OVATION系統DCS卡件 Westinghouse 1C31194G03 Ovation Control Module
OVATION系統DCS卡件 Westinghouse 1C31194G03 Ovation Control Module
以往的繼電器連鎖方式無法提供形象的信息給操作人員,只能在出現故障后把相關的連鎖點都檢查一遍,處理時間長,影響生產進程,對隱含故障點無法判斷。現采用PLC控制則避免了上述問題,還可同時增加打印功能,完善系統,為經后的系統擴展做好充分的準備。具體功能如下所述:
(1) 控制保護功能
a. 當汽輪機轉速超過10%時,同時操作面板提示汽機超速,并提醒操作人員進行檢查超速原因;當汽輪機轉速超過12%時,操作面板再次提示汽機超速,并提示操作人員通知技術人員進行檢修維護,技術人員可根據實際情況確定是否停機或超速運行;當轉速超過15%時,汽輪機自行逐步減速,同時提示減速原因,1小時后汽輪機停機,同時操作面板上顯示汽機超速停機,打印機打印出停機原因:汽機超速停機。
b. 當汽輪機軸向位移大于Ⅰ值(安全臨界值)時,報警并提醒操作人員與同技術人員進行檢查超速原因;當汽輪機軸向位移大于Ⅱ值(安全隱患發生臨界值)時,1小時后停機。同時操作面板上顯示原因,打印機打出停機原因:軸向位移大停機。
c. 當潤滑油壓低于Ⅰ值時,報警并提醒操作人員與同技術人員進行檢查超速原因;當潤滑油壓低于Ⅱ值時,啟動交流油泵;當潤滑油壓低于Ⅲ值(危險臨界值)時,停機。同時操作面板顯示停機原因,打印機打印停機原因:潤滑油壓低停機。當潤滑油壓低于Ⅵ值(設備損壞臨界值)時,停盤車。
d. 當軸承油溫高于Ⅰ值時,報警并啟動油溫冷卻系統;當軸承油溫高于Ⅱ值時,1小時后停機;同時操作面板顯示停機原因,打印機打印停機原因:軸承回油溫度高停機。
e. 當軸承軸瓦溫度高于Ⅰ值時,報警并啟動油溫冷卻系統;當軸承軸瓦溫度高于Ⅱ值時警報連續提示,停機;同時操作面板顯示停機原因,打印機打印停機原因:軸承軸瓦溫度高停機。
f. 當電氣送來發電機故障信號時,停機;同時操作面板顯示停機原因,打印機打印停機原因:發電機故障停機。
g. 當主汽溫度低于Ⅰ值時,報警;當主汽溫度低于Ⅱ值時停機,同時操作面板顯示停機原因,打印機打印停機原因:主汽溫度低停機。
(2) 記憶功能 在自動主汽門跳閘后,由操作面板顯示出導致動作原因,以便于進行事故分析。
(3) 保護投退功能 在操作盤上設置保護投退開關,以便運行人員和檢修人員試驗和維修,防止在試驗或維修過程中,以及汽輪機啟動過程中,由于某個條件不滿足而引起的系統誤動作。
(4) 打印功能 系統能夠實時打印保護投退開關的投退時間及內容、所有保護動作的時間和內容。
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