描述
電氣系統(tǒng)納入DCS控制水平及技術(shù)要求
機(jī)組整套啟動(dòng)時(shí)從鍋爐點(diǎn)火至發(fā)電機(jī)并網(wǎng)帶初始負(fù)荷夠?qū)崿F(xiàn)全過(guò)程的自動(dòng)程序控制。(當(dāng)然可以設(shè)有限幾個(gè)斷點(diǎn)人工分析判斷決定后介入操作),或機(jī)組停機(jī)時(shí)DCS能安全停機(jī)。
機(jī)組自啟??刂频囊笫牵?br />
機(jī)組正常起動(dòng)時(shí),當(dāng)發(fā)電機(jī)達(dá)到額定轉(zhuǎn)速時(shí),DCS將投入AVR。當(dāng)發(fā)電機(jī)電壓達(dá)到額定值時(shí),DCS將投入同期裝置。發(fā)電機(jī)與電網(wǎng)的同期是由同期裝置自動(dòng)實(shí)現(xiàn),在同期過(guò)程中通過(guò)DCS控制AVR、DEH,當(dāng)同期條件滿足時(shí),向發(fā)電機(jī)斷路器發(fā)合閘指令。在同期合閘成功,發(fā)電機(jī)電負(fù)荷達(dá)到一定值之后,DCS將高壓廠用電系統(tǒng)快速?gòu)膯渥兦袚Q到高壓廠變上。
機(jī)組正常停機(jī)時(shí),DCS控制降低機(jī)組負(fù)荷,當(dāng)機(jī)組負(fù)荷降到某一定值時(shí),DCS將高壓廠用電系統(tǒng)快速切換到啟/備變系統(tǒng)供電;當(dāng)機(jī)組負(fù)荷繼續(xù)降到零,跳開主開關(guān),聯(lián)跳汽輪機(jī)(主汽門關(guān)閉),發(fā)電機(jī)滅磁。
對(duì)于廠用電源系統(tǒng)控制的要求是:
在機(jī)組啟動(dòng)時(shí)通過(guò)啟/備變向廠用負(fù)荷供電;在機(jī)組正常用電時(shí),由廠變供電并經(jīng)低壓廠變向400VMCC低壓負(fù)荷供電以啟動(dòng)機(jī)組所必需的輔機(jī);在廠用電消失時(shí),為了保護(hù)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(fù)荷自動(dòng)切換至啟/備變;當(dāng)確認(rèn)保安段母線失壓后,應(yīng)啟動(dòng)事故備用柴油機(jī)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(jī)系統(tǒng)能實(shí)現(xiàn)程序控制和軟手操控制使發(fā)電機(jī)由零起升速、升壓直到并網(wǎng)帶初始負(fù)荷。
(2)廠用電系統(tǒng)能按啟動(dòng)/停止階段和正常運(yùn)行階段的要求程序控制和軟手操來(lái)實(shí)現(xiàn)。
(3)能實(shí)時(shí)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(yùn)行、異常運(yùn)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(jī)組(爐機(jī)電)實(shí)現(xiàn)全CRT監(jiān)控。
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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