時間過流元件的時間計算是由-個內部的內量容量存儲變量來做的。當這個變量表明能量容量已經達到100%，時間過流元件將會動作。如果這個變量積累的能量容量小于100%并且電流跌落到啟動門檻值的97%到98%，這個變量必須被減小。

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