描述
一、用電設(shè)備電流估算:當(dāng)知道用電設(shè)備的功率時(shí)可以估算它的額定電流:
三相電動(dòng)機(jī)的額定電流按照電機(jī)功率的2倍算,即每千瓦乘以2就是額定電流的電流量,譬如一個(gè)三相電機(jī)的額定功率為10千瓦,則額定電流為20安培。這種估算方式對(duì)三相鼠籠式異步電動(dòng)機(jī)尤其是四級(jí)最為接近,對(duì)于其它類型的電動(dòng)機(jī)也可以
單相220V電動(dòng)機(jī)每千瓦電流按8A計(jì)算
三相380V電焊機(jī)每千瓦電流按2.7A算(帶電動(dòng)機(jī)式直流電焊機(jī)應(yīng)按每千瓦2A算)
單相220V電焊機(jī)每千瓦按4.5A算
單相白熾燈、碘鎢燈每千瓦電流按4.5A算
注意:工地上常用的鏑燈為380V電源(只有兩根相線,一根地線),電流每千瓦按照2.7A算
二、不同電壓等級(jí)的三相電動(dòng)機(jī)額定電流計(jì)算
口訣:容量除以千伏數(shù),商乘系數(shù)點(diǎn)七六。
說(shuō)明:
(1)口訣適用于任何電壓等級(jí)的三相電動(dòng)機(jī)額定電流計(jì)算。由公式及口訣均可說(shuō)明容量相同的電壓等級(jí)不同的電動(dòng)機(jī)的額定電流是不相同的,即電壓千伏數(shù)不一樣,去除以相同的容量,所得“商數(shù)”顯然不相同,不相同的商數(shù)去乘相同的系數(shù)0.76,所得的電流值也不相同。若把以上口訣叫做通用口訣,則可推導(dǎo)出計(jì)算220、380、660、3.6kV電壓等級(jí)電動(dòng)機(jī)的額定電流專用計(jì)算口訣,用專用計(jì)算口訣計(jì)算某臺(tái)三相電動(dòng)機(jī)額定電流時(shí),容量千瓦與電流安培關(guān)系直接倍數(shù)化,省去了容量除以千伏數(shù),商數(shù)再乘系數(shù)0.76
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