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產(chǎn)品簡介
PC-A984-145
PC-A984-145
產(chǎn)品價格:¥260
上架日期:2019-09-20 17:33:23
產(chǎn)地:PC-A984-145
發(fā)貨地:福州
供應(yīng)數(shù)量:不限
最少起訂:1個
瀏覽量:181
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詳細說明

    PC-A984-145現(xiàn)貨 in stock! 歡迎來電咨詢~??!

    PC-A984-145,

    PC-A984-145

    PC-A984-145


    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;對于中小型的企業(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、施工及維護經(jīng)驗 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 備不夠完善和人員運行經(jīng)驗欠缺,中小型火電廠更應(yīng)重視此 點。電源穩(wěn)定供應(yīng)、信號正確分類及電纜合理敷設(shè)、接地有效 實施作為抑制干擾、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)對電源、信號、接地的抗干擾要求,結(jié)合工程經(jīng)驗,闡述了這三方面的抗干擾設(shè)計方 案,提出了施工及維護中的一些注意事項,供項目設(shè)計、施工 以及維護參考,以便實現(xiàn)DCS的有效投入,保證電廠安全穩(wěn) 定運行。
      2 DCS系統(tǒng)抗干擾要求
      為提高電廠DCS系統(tǒng)的測量水平和控制精度,保證控制 系統(tǒng)的安全、穩(wěn)定、可靠運行,熱控專業(yè)在設(shè)計、施工、維護階段必須合理考慮DCS系統(tǒng)在電源、信號、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)計中在沒選擇電源和開關(guān)型號時,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,不僅要求根據(jù)電流容量選擇合適線徑,而 且要求有足夠機械強度,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 法實現(xiàn)獨立電源,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)自動電源切投裝置,切投時間應(yīng)確保 不影響控制系統(tǒng)的運行。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)丟失或異常動作;任何一路電源 失去都應(yīng)在控制系統(tǒng)獲得報警。
      2.2信號要求
      DCS的輸入、輸出信號線是干擾信號進入DCS的途徑之一,一般來說信號越弱受干擾的影響越大。首先應(yīng)對信號分類 如下:
     ?、買類信號:熱電阻信號、熱電偶信號、毫伏信號、應(yīng)變信號等低電平信號。
     ?、冖蝾愋盘枺?~5 V、1~5 V、4~20 mA、0~10 mA模 擬量輸入信號;4~20 mA、0~10 mA模擬量輸出信號;電平型/觸點型開關(guān)量輸入信號;脈沖量輸入信號;24VDC小于50 mA的阻性負載開關(guān)量輸出信號。
     ?、邰箢愋盘枺?4V~48VDC感性負載或電流大于50 mA 的阻性負載的開關(guān)量輸出信號。
      ④Ⅳ類信號:110VAC或220VAC開關(guān)量輸出信號,此類信號的饋線可視作電源線處理布線的問題。
      其中,I類信號很容易被干擾,Ⅱ類信號容易被干擾,而Ⅲ和Ⅳ類信號在開關(guān)動作瞬間會成為強烈的干擾源,通過空間環(huán)境干擾附近的信號線。
      為了有效減小各個信號之間的干擾,不同類型的信號電纜與DCS相連時,信號電纜的設(shè)計和布置應(yīng)滿足以下原則:
      ①對于I類信號電纜,最好采用屏蔽雙絞電纜。
    ?、趯τ冖蝾愋盘?,盡可能采用屏蔽電纜,其中Ⅱ類信號中用于控制、聯(lián)鎖的模入/模出信號、開入信號,必須采用屏蔽 電纜。
     ?、蹖τ冖纛愋盘枃澜cI、Ⅱ類信號捆在一起走線,應(yīng)作為220 V電源線處理,與電源電纜一起走線,有條件時建議采 用屏蔽雙絞電纜。
     ?、軐τ冖箢愋盘枺试S與220 V電源線一起走線(即與Ⅳ類信號相同),也可以與I、Ⅱ類信號一起走線。但在后者情 況下Ⅲ類信號必須采用屏蔽電纜,最好為屏蔽雙絞電纜,且與 I、Ⅱ類信號電纜相距15cm以上。
     ?、萜帘坞娎|的屏蔽層必須只有一點接地,并且要接地 良好。
     ?、藿^對禁止大功率的開關(guān)量輸出信號線、電源線、動力線等電纜與直接進入DCS系統(tǒng)的I、Ⅱ類信號電纜并行捆綁。
      ⑦絕對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,另外部分芯線用于傳輸Ⅲ類或Ⅳ類信號。
     ?、鄧澜恍盘柕膸仔揪€分布在不同的幾條電纜中(如三線制的熱電阻)。

    上億庫存,國內(nèi)外近千個倉庫,公司部分產(chǎn)品型號如下,歡迎聯(lián)系哦~!

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