廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
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更新時間:2018-06-01 02:27:09瀏覽次數(shù):275
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IC693CBL313---IC693CBL313
IC693CBL313---IC693CBL313
串聯(lián)單點接地等效電路
圖3中各接地點的電位是:
Va=(I1+I2+I3)R1;
Vb=(I2+I3)R2+(I1+I2+I3)R1;
Vc=I3R3+(I2+I3)R2+(I1+I2+I3)R1
對于地線電流大,而線徑細的場合,三點電位將相差很多,高頻阻抗將產(chǎn)生共阻抗干擾。因此,我們在進行自控系統(tǒng)設計時,在選用單點接地方式時盡可能采用并聯(lián)單點接地方式外,還應考慮將參考點分開(數(shù)字量參考點、模擬量參考點、電源參考點),然后將它們連接到系統(tǒng)參考點。有可能的話,將系統(tǒng)參考點連接到現(xiàn)有的金屬外殼(可以減小共振和天線效應)。
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