設(shè)計思路:一是測當(dāng)前的電流值;二是根據(jù)電流過載倍數(shù)分段;三是計算出隨實時電流變化的保護時間(根據(jù)電流過載倍數(shù));四是按固定時間延時保護。
廈門岳航計算機工程有限公司
聯(lián)系人:李素云
企業(yè)QQ:2851195446,2851195466
手機:18965423501
座機:0592-5165501
設(shè)計缺點:這是一個時間的累積過程,只能估計熱量的變化,不能反映電機熱量的實時變化(忽略了電流上升的升溫過程),需經(jīng)反復(fù)實驗得程序流程圖如圖3。
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圖3 軟件流程圖