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6EP1334-2BA00
6EP1334-2BA00
產(chǎn)品價(jià)格:¥1
上架日期:2019-08-19 12:29:35
產(chǎn)地:6EP1334-2BA00
發(fā)貨地:福州
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    6EP1334-2BA00現(xiàn)貨 in stock! 歡迎來(lái)電咨詢(xún)~!!

    6EP1334-2BA00


    分散控制系統(tǒng)(DCS)已在大型火力發(fā)電廠(chǎng)廣泛應(yīng)用,并取得諸多經(jīng)驗(yàn);對(duì)于中小型的企業(yè)自備火電廠(chǎng)或區(qū)域熱電廠(chǎng),DCS系統(tǒng)的應(yīng)用正在逐步推廣,但其設(shè)計(jì)、施工及維護(hù)經(jīng)驗(yàn) 尚有欠缺,需要不斷摸索和總結(jié)。
      其DCS系統(tǒng)面臨的重要問(wèn)題之一就是如何有效地抑制干擾,提高控制系統(tǒng)的安全性、穩(wěn)定性與可靠性,由于技術(shù)儲(chǔ) 備不夠完善和人員運(yùn)行經(jīng)驗(yàn)欠缺,中小型火電廠(chǎng)更應(yīng)重視此 點(diǎn)。電源穩(wěn)定供應(yīng)、信號(hào)正確分類(lèi)及電纜合理敷設(shè)、接地有效 實(shí)施作為抑制干擾、提高系統(tǒng)可靠性的有效方法,值得廣泛探討與研究。
      通過(guò)分析中小型火發(fā)廠(chǎng)DCS系統(tǒng)對(duì)電源、信號(hào)、接地的抗干擾要求,結(jié)合工程經(jīng)驗(yàn),闡述了這三方面的抗干擾設(shè)計(jì)方 案,提出了施工及維護(hù)中的一些注意事項(xiàng),供項(xiàng)目設(shè)計(jì)、施工 以及維護(hù)參考,以便實(shí)現(xiàn)DCS的有效投入,保證電廠(chǎng)安全穩(wěn) 定運(yùn)行。
      2 DCS系統(tǒng)抗干擾要求
      為提高電廠(chǎng)DCS系統(tǒng)的測(cè)量水平和控制精度,保證控制 系統(tǒng)的安全、穩(wěn)定、可靠運(yùn)行,熱控專(zhuān)業(yè)在設(shè)計(jì)、施工、維護(hù)階段必須合理考慮DCS系統(tǒng)在電源、信號(hào)、接地方面的抗干擾要求。
      2.1 電源要求
      電源安全性是任何供電系統(tǒng)必須滿(mǎn)足的最基本條件。首先在前期設(shè)計(jì)中在沒(méi)選擇電源和開(kāi)關(guān)型號(hào)時(shí),充分考慮所有設(shè)備最大工作電流,并留出足夠余量,方便日后增加設(shè)備。其次在選擇電源線(xiàn)路時(shí),不僅要求根據(jù)電流容量選擇合適線(xiàn)徑,而 且要求有足夠機(jī)械強(qiáng)度,具有防腐性,并且能夠阻燃。
      電源可靠性和連續(xù)性是DCS穩(wěn)定運(yùn)行的前提。DCS供電 系統(tǒng)除給DCS供電外,不應(yīng)再接入其他系統(tǒng)和設(shè)備,如果無(wú) 法實(shí)現(xiàn)獨(dú)立電源,那么可以通過(guò)加裝電源隔離裝置的方法(常 用UPS不間斷電源)來(lái)實(shí)現(xiàn)。供電電源應(yīng)有兩路電源供電,一路應(yīng)采用交流不問(wèn)斷電源(UPS),另一路來(lái)自廠(chǎng)用低壓工 作段電源。兩路電源宜設(shè)自動(dòng)電源切投裝置,切投時(shí)間應(yīng)確保 不影響控制系統(tǒng)的運(yùn)行。任何一路電源失去或故障不應(yīng)引起控 制系統(tǒng)任何部分的故障、數(shù)據(jù)丟失或異常動(dòng)作;任何一路電源 失去都應(yīng)在控制系統(tǒng)獲得報(bào)警。
      2.2信號(hào)要求
      DCS的輸入、輸出信號(hào)線(xiàn)是干擾信號(hào)進(jìn)入DCS的途徑之一,一般來(lái)說(shuō)信號(hào)越弱受干擾的影響越大。首先應(yīng)對(duì)信號(hào)分類(lèi) 如下:
     ?、買(mǎi)類(lèi)信號(hào):熱電阻信號(hào)、熱電偶信號(hào)、毫伏信號(hào)、應(yīng)變信號(hào)等低電平信號(hào)。
     ?、冖蝾?lèi)信號(hào):0~5 V、1~5 V、4~20 mA、0~10 mA模 擬量輸入信號(hào);4~20 mA、0~10 mA模擬量輸出信號(hào);電平型/觸點(diǎn)型開(kāi)關(guān)量輸入信號(hào);脈沖量輸入信號(hào);24VDC小于50 mA的阻性負(fù)載開(kāi)關(guān)量輸出信號(hào)。
     ?、邰箢?lèi)信號(hào):24V~48VDC感性負(fù)載或電流大于50 mA 的阻性負(fù)載的開(kāi)關(guān)量輸出信號(hào)。
     ?、堍纛?lèi)信號(hào):110VAC或220VAC開(kāi)關(guān)量輸出信號(hào),此類(lèi)信號(hào)的饋線(xiàn)可視作電源線(xiàn)處理布線(xiàn)的問(wèn)題。
      其中,I類(lèi)信號(hào)很容易被干擾,Ⅱ類(lèi)信號(hào)容易被干擾,而Ⅲ和Ⅳ類(lèi)信號(hào)在開(kāi)關(guān)動(dòng)作瞬間會(huì)成為強(qiáng)烈的干擾源,通過(guò)空間環(huán)境干擾附近的信號(hào)線(xiàn)。
      為了有效減小各個(gè)信號(hào)之間的干擾,不同類(lèi)型的信號(hào)電纜與DCS相連時(shí),信號(hào)電纜的設(shè)計(jì)和布置應(yīng)滿(mǎn)足以下原則:
     ?、賹?duì)于I類(lèi)信號(hào)電纜,最好采用屏蔽雙絞電纜。
    ?、趯?duì)于Ⅱ類(lèi)信號(hào),盡可能采用屏蔽電纜,其中Ⅱ類(lèi)信號(hào)中用于控制、聯(lián)鎖的模入/模出信號(hào)、開(kāi)入信號(hào),必須采用屏蔽 電纜。
     ?、蹖?duì)于Ⅳ類(lèi)信號(hào)嚴(yán)禁與I、Ⅱ類(lèi)信號(hào)捆在一起走線(xiàn),應(yīng)作為220 V電源線(xiàn)處理,與電源電纜一起走線(xiàn),有條件時(shí)建議采 用屏蔽雙絞電纜。
     ?、軐?duì)于Ⅲ類(lèi)信號(hào),允許與220 V電源線(xiàn)一起走線(xiàn)(即與Ⅳ類(lèi)信號(hào)相同),也可以與I、Ⅱ類(lèi)信號(hào)一起走線(xiàn)。但在后者情 況下Ⅲ類(lèi)信號(hào)必須采用屏蔽電纜,最好為屏蔽雙絞電纜,且與 I、Ⅱ類(lèi)信號(hào)電纜相距15cm以上。
     ?、萜帘坞娎|的屏蔽層必須只有一點(diǎn)接地,并且要接地 良好。
     ?、藿^對(duì)禁止大功率的開(kāi)關(guān)量輸出信號(hào)線(xiàn)、電源線(xiàn)、動(dòng)力線(xiàn)等電纜與直接進(jìn)入DCS系統(tǒng)的I、Ⅱ類(lèi)信號(hào)電纜并行捆綁。
      ⑦絕對(duì)禁止采用一根多芯電纜中的部份芯線(xiàn)用于傳輸I類(lèi) 或Ⅱ類(lèi)的信號(hào),另外部分芯線(xiàn)用于傳輸Ⅲ類(lèi)或Ⅳ類(lèi)信號(hào)。
      ⑧嚴(yán)禁同一信號(hào)的幾芯線(xiàn)分布在不同的幾條電纜中(如三線(xiàn)制的熱電阻)。

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