6es5945-7ua11控制器模塊
6es5945-7ua11控制器模塊
6es5945-7ua11控制器模塊
前言
上世紀(jì)九十年代初,DCS剛開始在火電廠嘗試應(yīng)用時(shí),由于DCS技術(shù)尚處于發(fā)展的初期階段,且沒有應(yīng)用經(jīng)驗(yàn),因此,在配置DCS的同時(shí),還設(shè)計(jì)了大量后備監(jiān)控設(shè)備。后來的實(shí)踐證明,DCS不僅提高了機(jī)組自動(dòng)化水平,而且相比傳統(tǒng)控制設(shè)備來說也是可靠、的設(shè)備。但是,實(shí)踐同樣證明,DCS仍然不可避免會(huì)出現(xiàn)故障,而且由于DCS是一個(gè)大系統(tǒng),將機(jī)組的眾多控制系統(tǒng)通過網(wǎng)絡(luò)熔合成為一個(gè)不可分割的、相互獨(dú)立性差的大系統(tǒng),局部故障常常會(huì)演變成全局性故障,因此,配置必要的獨(dú)立于DCS的后備監(jiān)控設(shè)備仍然是國內(nèi)外的共識(shí),但是,目前的DCS后備監(jiān)控設(shè)備配置是否合理,究竟應(yīng)當(dāng)怎樣配置,仍然需要我們再思考和研究。
一、DCS后備監(jiān)控設(shè)備配置的現(xiàn)狀
上世紀(jì)九十年代中后期,DCS被火電廠廣泛應(yīng)用,其控制功能范圍也日益擴(kuò)大。電力規(guī)劃設(shè)計(jì)總院于1993年4月19日和1996年11月29日二次頒發(fā)的《單元機(jī)組分散控制系統(tǒng)設(shè)計(jì)若干技術(shù)問題規(guī)定》(以下簡稱《規(guī)定》),以及后來發(fā)布的《火力發(fā)電廠設(shè)計(jì)技術(shù)規(guī)程》(DL5000-2000)(以下簡稱《規(guī)程》)對(duì)DCS后備監(jiān)控設(shè)備配置原則和要求均做出了較詳細(xì)的規(guī)定。《規(guī)程》要求后備監(jiān)控設(shè)備的設(shè)置應(yīng)滿足“當(dāng)分散控制系統(tǒng)發(fā)生全局性或重大故障時(shí)(例如分散控制系統(tǒng)電源消失、通訊中斷、全部操作員站失去功能、重要控制站失去控制和保護(hù)功能等)”應(yīng)“確保機(jī)組緊急停機(jī)”。第一版《規(guī)定》還明確要求“當(dāng)一個(gè)控制站故障時(shí),能保證穩(wěn)定負(fù)荷下短時(shí)運(yùn)行和停機(jī)”。
根據(jù)當(dāng)時(shí)的認(rèn)識(shí),具體規(guī)定如下:
1)應(yīng)設(shè)置獨(dú)立于DCS的后備操作手段
汽輪機(jī)跳閘
總?cè)剂咸l
發(fā)電機(jī)-變壓器組跳閘
鍋爐門(機(jī)械式可不裝)
汽包事故放水門
汽輪機(jī)真空破壞門
真流潤滑油泵
交流潤滑油泵
發(fā)電機(jī)滅磁開關(guān)
柴油機(jī)啟動(dòng)
2)順序控制系統(tǒng)和模擬量控制系統(tǒng)可不配置后備操作器
3)機(jī)爐不宜配置常規(guī)報(bào)警裝置,必要時(shí)可按下列原則為每個(gè)單元機(jī)組設(shè)置不超過20個(gè)光字牌報(bào)警窗口。
目前,火電廠DCS后備監(jiān)控設(shè)備基本上均按上述要求進(jìn)行配置,后備儀表只配置汽包水位和爐膛火焰工業(yè)電視,而常規(guī)報(bào)警裝置大多均已不再配置。
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