描述
公用系統(tǒng)控制方式
對于2臺機組的公用系統(tǒng),如廠用公用及備用電源系統(tǒng)等與熱工控制系統(tǒng)一樣,DCS的配置能夠?qū)崿F(xiàn)機組停止時,另一臺機組的運行人員能對公用系統(tǒng)進行監(jiān)控,并且要求采用可靠的措施,確保其控制命令的唯一性,即在同一時間只允許一套DCS系統(tǒng)對公用設(shè)備起控制作用。不能因為公用系統(tǒng)的存在,而使2臺機組的DCS耦合在一起。
在工程實際應(yīng)用過程中,依照DCS的特點采用了2種典型的方法來實現(xiàn)對公用系統(tǒng)的控制。九江三期的DCS是HITACHI公司生產(chǎn)的HIACS7000系統(tǒng),在DCS的配置中,我們在2臺機組中配置相同的硬件和軟件,通過切換開關(guān)來實現(xiàn)操作權(quán)的轉(zhuǎn)換。外部設(shè)備的信號通過冗余配置(模擬量)或通過擴展轉(zhuǎn)換(開關(guān)量)分別送入2套DCS系統(tǒng)。同時因保證不出現(xiàn)誤操作事故,還增加了相當部分的判據(jù)條件和I/0測點,這種方式的優(yōu)點是當一臺機組停運或檢修,可以較方便地對DCS進行檢查,同時也增大了控制的可靠性,缺點是增加了外部設(shè)備的數(shù)量,增加了費用。增加一個環(huán)節(jié)也就意味著增加了故障發(fā)生的可能。信陽一期、益陽一期的DCS是由Bailey公司提供的INFI-90系統(tǒng),針對其系統(tǒng)結(jié)構(gòu)采用了公用環(huán),公用系統(tǒng)的控制全部通過公用環(huán)配置來實現(xiàn)。2套DCS通過Tagnumber來實現(xiàn)控制,這樣較好地解決了耦合問題。這種控制方式的優(yōu)點是配置較少,外部設(shè)備也不用增加,有效地利用了信息資源;缺點是公用環(huán)的設(shè)備不能停電檢修,除非2臺機組均停機檢修,加重了設(shè)備運行安全性的要求。
產(chǎn)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(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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