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用全部容量Ⅰ依次減去部分容量Ⅱ及Ⅲ
 (D.2.4.3-1)
D.2.4.4 隨機(jī)(沖擊)負(fù)荷計(jì)算時(shí)間取5s，容量換算系數(shù)KC在沒有曲線可查時(shí)可取 0.9，則
圖 D.2.4.2-1 第二階段負(fù)荷曲線
圖 D.2.4.3-1 第三階段負(fù)荷曲線
隨機(jī)負(fù)荷計(jì)算容量KR=IR/0.9，將CR疊加在Cc2或Cc3上，然后與Cc1比較，取 其大者，即為蓄電池的計(jì)算容量。
D.3 表格化階梯負(fù)荷計(jì)算法(見圖D.3-1及表D.3-1)，仍按式(D.2.2-1)計(jì)算，計(jì)算結(jié) 果見表D.3-2，計(jì)算方法及步驟，舉例如下：
圖 D.3-1 階梯負(fù)荷計(jì)算示意圖
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