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在電機(jī)過載運(yùn)行時(shí)，電流的大小不是恒定的，而是不同時(shí)刻實(shí)際電流的大小可能不同，過載電流的熱效應(yīng)隨時(shí)間累積，過載熱量對(duì)時(shí)間積分。因此式(1)可以表示為：
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