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1771-A2B
1771-A2B
產(chǎn)品價(jià)格:¥1(人民幣)
  • 規(guī)格:1771-A2B
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      1771-A2B現(xiàn)貨 in stock! 歡迎來電咨詢~!!

      1771-A2B


      分散控制系統(tǒng)(DCS)已在大型火力發(fā)電廠廣泛應(yīng)用,并取得諸多經(jīng)驗(yàn);對(duì)于中小型的企業(yè)自備火電廠或區(qū)域熱電廠,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,中小型火電廠更應(yīng)重視此 點(diǎn)。電源穩(wěn)定供應(yīng)、信號(hào)正確分類及電纜合理敷設(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。
        通過分析中小型火發(fā)廠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,保證電廠安全穩(wěn) 定運(yùn)行。
        2 DCS系統(tǒng)抗干擾要求
        為提高電廠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)必須滿足的最基本條件。首先在前期設(shè)計(jì)中在沒選擇電源和開關(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。其次在選擇電源線路時(shí),不僅要求根據(jù)電流容量選擇合適線徑,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 法實(shí)現(xiàn)獨(dú)立電源,那么可以通過加裝電源隔離裝置的方法(常 用UPS不間斷電源)來實(shí)現(xiàn)。供電電源應(yīng)有兩路電源供電,一路應(yīng)采用交流不問斷電源(UPS),另一路來自廠用低壓工 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)線是干擾信號(hào)進(jìn)入DCS的途徑之一,一般來說信號(hào)越弱受干擾的影響越大。首先應(yīng)對(duì)信號(hào)分類 如下:
        ①I類信號(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)。
        ②Ⅱ類信號(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)載開關(guān)量輸出信號(hào)。
        ③Ⅲ類信號(hào):24V~48VDC感性負(fù)載或電流大于50 mA 的阻性負(fù)載的開關(guān)量輸出信號(hào)。
        ④Ⅳ類信號(hào):110VAC或220VAC開關(guān)量輸出信號(hào),此類信號(hào)的饋線可視作電源線處理布線的問題。
        其中,I類信號(hào)很容易被干擾,Ⅱ類信號(hào)容易被干擾,而Ⅲ和Ⅳ類信號(hào)在開關(guān)動(dòng)作瞬間會(huì)成為強(qiáng)烈的干擾源,通過空間環(huán)境干擾附近的信號(hào)線。
        為了有效減小各個(gè)信號(hào)之間的干擾,不同類型的信號(hào)電纜與DCS相連時(shí),信號(hào)電纜的設(shè)計(jì)和布置應(yīng)滿足以下原則:
        ①對(duì)于I類信號(hào)電纜,最好采用屏蔽雙絞電纜。
       ②對(duì)于Ⅱ類信號(hào),盡可能采用屏蔽電纜,其中Ⅱ類信號(hào)中用于控制、聯(lián)鎖的模入/模出信號(hào)、開入信號(hào),必須采用屏蔽 電纜。
        ③對(duì)于Ⅳ類信號(hào)嚴(yán)禁與I、Ⅱ類信號(hào)捆在一起走線,應(yīng)作為220 V電源線處理,與電源電纜一起走線,有條件時(shí)建議采 用屏蔽雙絞電纜。
        ④對(duì)于Ⅲ類信號(hào),允許與220 V電源線一起走線(即與Ⅳ類信號(hào)相同),也可以與I、Ⅱ類信號(hào)一起走線。但在后者情 況下Ⅲ類信號(hào)必須采用屏蔽電纜,最好為屏蔽雙絞電纜,且與 I、Ⅱ類信號(hào)電纜相距15cm以上。
        ⑤屏蔽電纜的屏蔽層必須只有一點(diǎn)接地,并且要接地 良好。
        ⑥絕對(duì)禁止大功率的開關(guān)量輸出信號(hào)線、電源線、動(dòng)力線等電纜與直接進(jìn)入DCS系統(tǒng)的I、Ⅱ類信號(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用于傳輸I類 或Ⅱ類的信號(hào),另外部分芯線用于傳輸Ⅲ類或Ⅳ類信號(hào)。
        ⑧嚴(yán)禁同一信號(hào)的幾芯線分布在不同的幾條電纜中(如三線制的熱電阻)。

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