140DDO35300

140DDO35300

4正確選擇接地點,完善接地系統(tǒng) 

接地的目的通常有兩個,其一為了安全,其二是為了抑制干擾。完善的接地系統(tǒng)是DCS控制系統(tǒng)抗電磁干擾的重要措施之一。 

系統(tǒng)接地方式有：浮地方式、直接接地方式和電容接地三種方式。對DCS控制系統(tǒng)而言,它屬高速低電平控制裝置,應采用直接接地方式。由于信號電纜分布電容和輸入裝置濾波等的影響,裝置之間的信號交換頻率一般都低于1MHz,所以DCS控制系統(tǒng)接地線采用一點接地和串聯(lián)一點接地方式。集中布置的DCS系統(tǒng)適于并聯(lián)一點接地方式,各裝置的柜體中心接地點以單獨的接地線引向接地極。如果裝置間距較大,應采用串聯(lián)一點接地方式。用一根大截面銅母線(或絕緣電纜)連接各裝置的柜體中心接地點,然后將接地母線直接連接接地極。接地線采用截面大于22mm2的銅導線,總母線使用截面大于60mm2的銅排。接地極的接地電阻小于2Ω,接地極埋在距建筑物10～15m遠處,而且DCS系統(tǒng)接地點必須與強電設備接地點相距10m以上。

信號源接地時,屏蔽層應在信號側接地；不接地時,應在DCS側接地；信號線中間有接頭時,屏蔽層應牢固連接并進行絕緣處理,一定要避免多點接地；多個測點信號的屏蔽雙絞線與多芯對絞總屏電纜連接時,各屏蔽層應相互連接好,并經絕緣處理。選擇適當的接地處單點接點。 

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