描述
電氣系統(tǒng)納入DCS控制水平及技術(shù)要求
機組整套啟動時從鍋爐點火至發(fā)電機并網(wǎng)帶初始負荷夠?qū)崿F(xiàn)全過程的自動程序控制。(當然可以設(shè)有限幾個斷點人工分析判斷決定后介入操作),或機組停機時DCS能安全停機。
機組自啟??刂频囊笫牵?br />
機組正常起動時,當發(fā)電機達到額定轉(zhuǎn)速時,DCS將投入AVR。當發(fā)電機電壓達到額定值時,DCS將投入同期裝置。發(fā)電機與電網(wǎng)的同期是由同期裝置自動實現(xiàn),在同期過程中通過DCS控制AVR、DEH,當同期條件滿足時,向發(fā)電機斷路器發(fā)合閘指令。在同期合閘成功,發(fā)電機電負荷達到一定值之后,DCS將高壓廠用電系統(tǒng)快速從啟備變切換到高壓廠變上。
機組正常停機時,DCS控制降低機組負荷,當機組負荷降到某一定值時,DCS將高壓廠用電系統(tǒng)快速切換到啟/備變系統(tǒng)供電;當機組負荷繼續(xù)降到零,跳開主開關(guān),聯(lián)跳汽輪機(主汽門關(guān)閉),發(fā)電機滅磁。
對于廠用電源系統(tǒng)控制的要求是:
在機組啟動時通過啟/備變向廠用負荷供電;在機組正常用電時,由廠變供電并經(jīng)低壓廠變向400VMCC低壓負荷供電以啟動機組所必需的輔機;在廠用電消失時,為了保護設(shè)備和系統(tǒng)的安全,廠用電快切裝置應(yīng)快速將廠用工作負荷自動切換至啟/備變;當確認保安段母線失壓后,應(yīng)啟動事故備用柴油機供電以保證設(shè)備安全。
依據(jù)以上控制水平的要求,電氣監(jiān)控納入DCS技術(shù)的要求是:
(1)發(fā)電機系統(tǒng)能實現(xiàn)程序控制和軟手操控制使發(fā)電機由零起升速、升壓直到并網(wǎng)帶初始負荷。
(2)廠用電系統(tǒng)能按啟動/停止階段和正常運行階段的要求程序控制和軟手操來實現(xiàn)。
(3)能實時顯示和記錄上述發(fā)變組系統(tǒng)和廠用電系統(tǒng)的正常運行、異常運行和事故狀態(tài)下的各種數(shù)據(jù)和狀態(tài),并提供操作指導(dǎo)和應(yīng)急處理措施。
(4)單元機組(爐機電)實現(xiàn)全CRT監(jiān)控。
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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