描述
A8251-758
空間的輻射電磁場（EMI）主要是由電力網(wǎng)絡(luò)、電氣設(shè)備的暫態(tài)過程、雷電、無線電廣播、電視、雷達(dá)、高頻感應(yīng)加熱設(shè)備等產(chǎn)生的，通常稱為輻射干擾，其分布極為復(fù)雜。若DCS系統(tǒng)置于所射頻場內(nèi)，就回收到輻射干擾，其影響主要通過兩條路徑：一是直接對DCS內(nèi)部的輻射，由電路感應(yīng)產(chǎn)生干擾；而是對DCS通信內(nèi)網(wǎng)絡(luò)的輻射，由通信線路的感應(yīng)引入干擾。輻射干擾與現(xiàn)場設(shè)備布置及設(shè)備所產(chǎn)生的電磁場大小，特別是頻率有關(guān)，一般通過設(shè)置屏蔽電纜和DCS局部屏蔽及高壓泄放元件進(jìn)行保護(hù)。實(shí)踐證明，因電源引入的干擾造成DCS控制系統(tǒng)故障的情況很多，筆者在某工程調(diào)試中遇到過，后更換隔離性能更高的DCS電源，問題才得到解決。DCS系統(tǒng)的正常供電電源均由電網(wǎng)供電。由于電網(wǎng)覆蓋范圍廣，它將受到所有空間電磁干擾而在線路上感應(yīng)電壓和電路。尤其是電網(wǎng)內(nèi)部的變化，入開關(guān)操作浪涌、大型電力設(shè)備起停、交直流傳動裝置引起的諧波、電網(wǎng)短路暫態(tài)沖擊等，都通過輸電線路傳到電源原邊。DCS電源通常采用隔離電源，但其機(jī)構(gòu)及制造工藝因素使其隔離性并不理想。實(shí)際上，由于分布參數(shù)特別是分布電容的存在，絕對隔離是不可能的。與DCS控制系統(tǒng)連接的各類信號傳輸線，除了傳輸有效的各類信息之外，總會有外部干擾信號侵入。此干擾主要有兩種途徑：一是通過變送器供電電源或共用信號儀表的供電電源串入的電網(wǎng)干擾，這往往被忽視；二是信號線受空間電磁輻射感應(yīng)的干擾，即信號線上的外部感應(yīng)干擾，這是很嚴(yán)重的。由信號引入干擾會引起I/O信號工作異常和測量精度大大降低，嚴(yán)重時(shí)將引起元器件損傷。對于隔離性能差的系統(tǒng)，還將導(dǎo)致信號間互相干擾，引起共地系統(tǒng)總線回流，造成邏輯數(shù)據(jù)變化、誤動和死機(jī)。DCS控制系統(tǒng)因信號引入干擾造成I/O模件損壞數(shù)相當(dāng)嚴(yán)重，由此引起系統(tǒng)故障的情況也很多。
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)勢價(jià)格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門子，摩托羅拉，安川。力士樂。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
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