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- 電動機接觸器熱元件選型計算公式
- 發布日期:2021年09月30日 點擊次數:79 所屬分類:技術資料
熱元件選型計算
口訣:電動機選接流,兩倍額定電流求,
電動機求電流,一千瓦等于一個流。
電動機選熱元件,一點二倍額流算,
一倍額流來整定,過載保護有保證。
說明:是(shi)接通和斷開電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)負載電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)一種控制電(dian)(dian)(dian)(dian)(dian)器,一般(ban)交(jiao)流(liu)(liu)(liu)接觸(chu)器的(de)(de)額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)按(an)(an)電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)1.3-2倍選(xuan)擇,口訣(jue)(jue)中(zhong),電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)選(xuan)接流(liu)(liu)(liu),兩倍額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)求,是(shi)指電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)選(xuan)擇交(jiao)流(liu)(liu)(liu)接觸(chu)器的(de)(de)額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)按(an)(an)電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)2倍。選(xuan)擇口訣(jue)(jue)中(zhong)的(de)(de)電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji),選(xuan)熱元件,一點(dian)二倍額(e)流(liu)(liu)(liu)算,一倍額(e)流(liu)(liu)(liu)來整定(ding)(ding)(ding),過(guo)(guo)載保護有保證,是(shi)指電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)熱元件其額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)按(an)(an)電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)1.2倍選(xuan)擇,按(an)(an)電(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)1倍額(e)定(ding)(ding)(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)整定(ding)(ding)(ding)是(shi)電(dian)(dian)(dian)(dian)(dian)路的(de)(de)過(guo)(guo)載保護。有疑問咨(zi)詢科(ke)安達(da)技術(shu)熱線:13357981888
例如:有一臺三相額定電壓為380伏,容量為10千瓦,
功率因數為0.85,效率為0.95,求電動機電流,并選擇交流接觸熱元件及整定值。
解:(1)經驗口訣公式:10千瓦×2=20(安)
(2)已知 U=380V P=10千瓦 cosΦ=0.85 n=0.95
電流I= P/(×U×cosΦ×n)
=10/(1.73×0.38×0.85×0.95)=20(安)
選擇交流接觸器:KM=Ke×(1.3-2)=20×2=40(安)
選 CJ10--40
選熱元件:FR=Ic×(1.1~1.25)=20×1.25=25(安)
選 JR16—20/30,JR按20安整定
答:電(dian)動機電(dian)流為20安(an)(an)培(pei),選40安(an)(an)接觸(chu)器,熱元件(jian)額(e)定電(dian)流為25安(an)(an),整(zheng)定到20安(an)(an)。- 相關標簽:電加熱設備
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