140DAI45300
140DAI45300
安全柵的作用是保護(hù)危險(xiǎn)現(xiàn)場(chǎng)端永遠(yuǎn)處于安全電源和安全電壓范圍之內(nèi)。如果現(xiàn)場(chǎng)端短路,則由于負(fù)載電阻和安全柵電阻R的限流作用,會(huì)將導(dǎo)線上的電流限制在安全范圍內(nèi),使現(xiàn)場(chǎng)端不至于產(chǎn)生很高的溫度,引起燃燒。第二種情況,如果計(jì)算機(jī)一端產(chǎn)生故障,則高壓電信號(hào)加入了信號(hào)回路,則由于齊納二級(jí)的嵌位作用,也使電壓位于安全范圍。
值得提醒的是,由于齊納安全柵的引入,使得信號(hào)回路上的電阻增大了許多,因此,在設(shè)計(jì)輸出回路的負(fù)載能力時(shí),除了要考慮真正的負(fù)載要求以外,還要充分考慮安全柵的電阻,留有余地。
除了上述幾種接地外,在很多場(chǎng)合下容易引起混亂的還有一個(gè)供電系統(tǒng)地,也叫交流電源工作地,它是電力系統(tǒng)中為了運(yùn)行需要設(shè)的接地(如中性點(diǎn)接地)。
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