接點(diǎn)輸入改變對(duì)應(yīng)的靈活邏輯操作響應(yīng)時(shí)間等于去振蕩時(shí)間定值(頻率追蹤啟用時(shí)隨系統(tǒng)頻率改變)。如果狀態(tài)改變恰好發(fā)生在保護(hù)檢查過(guò)程之后，只能由下一個(gè)保護(hù)檢查過(guò)程來(lái)進(jìn)行識(shí)別。也就是說(shuō)，狀態(tài)改變的識(shí)別要延后一個(gè)保護(hù)檢查過(guò)程時(shí)間。如果改變發(fā)生在保護(hù)檢查過(guò)程之前，則改變能夠被馬上識(shí)別。統(tǒng)計(jì)表明,一般情況下平均存在半個(gè)保護(hù)檢查周期的延時(shí)。

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