描述
公用系統(tǒng)控制方式
對(duì)于2臺(tái)機(jī)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(jī)組停止時(shí),另一臺(tái)機(jī)組的運(yùn)行人員能對(duì)公用系統(tǒng)進(jìn)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(shí)間只允許一套DCS系統(tǒng)對(duì)公用設(shè)備起控制作用。不能因?yàn)楣孟到y(tǒng)的存在,而使2臺(tái)機(jī)組的DCS耦合在一起。
在工程實(shí)際應(yīng)用過程中,依照DCS的特點(diǎn)采用了2種典型的方法來實(shí)現(xiàn)對(duì)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?cè)?臺(tái)機(jī)組中配置相同的硬件和軟件,通過切換開關(guān)來實(shí)現(xiàn)操作權(quán)的轉(zhuǎn)換。外部設(shè)備的信號(hào)通過冗余配置(模擬量)或通過擴(kuò)展轉(zhuǎn)換(開關(guān)量)分別送入2套DCS系統(tǒng)。同時(shí)因保證不出現(xiàn)誤操作事故,還增加了相當(dāng)部分的判據(jù)條件和I/0測(cè)點(diǎn),這種方式的優(yōu)點(diǎn)是當(dāng)一臺(tái)機(jī)組停運(yùn)或檢修,可以較方便地對(duì)DCS進(jìn)行檢查,同時(shí)也增大了控制的可靠性,缺點(diǎn)是增加了外部設(shè)備的數(shù)量,增加了費(fèi)用。增加一個(gè)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(duì)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(shí)現(xiàn)。2套DCS通過Tagnumber來實(shí)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(diǎn)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(diǎn)是公用環(huán)的設(shè)備不能停電檢修,除非2臺(tái)機(jī)組均停機(jī)檢修,加重了設(shè)備運(yùn)行安全性的要求。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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