兩臺4KW的水泵要用鋁線需要多少平方?
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來源：互聯網發布日期：2019-07-24 09:42
現有兩臺4KW水(shui)泵，一起工作，距離(li)有300多米(mi)，電線要用(yong)鋁線需要多少平方的線?
2臺4KW=8KW電(dian)(dian)機(ji)而定(ding)電(dian)(dian)流(liu)(liu)為(wei)(wei)16安培，線(xian)(xian)路(lu)(lu)(lu)距(ju)離過(guo)長(chang)，電(dian)(dian)壓(ya)在傳輸過(guo)程(cheng)損耗很大(da)，造成的電(dian)(dian)壓(ya)降也較大(da)，按(an)變壓(ya)器端(duan)(duan)電(dian)(dian)壓(ya)400V時，線(xian)(xian)路(lu)(lu)(lu)末(mo)端(duan)(duan)允許電(dian)(dian)壓(ya)降(單(dan)線(xian)(xian))：U=15V，末(mo)端(duan)(duan)線(xian)(xian)電(dian)(dian)壓(ya)約為(wei)(wei)370V，電(dian)(dian)機(ji)總功率(lv)為(wei)(wei)4KW，額定(ding)電(dian)(dian)流(liu)(liu)：I≈16A，線(xian)(xian)路(lu)(lu)(lu)長(chang)度：L=300米根據負(fu)載電(dian)(dian)流(liu)(liu)求(qiu)鋁(lv)線(xian)(xian)(單(dan)線(xian)(xian))電(dian)(dian)阻：R=U/I=15/16=0.94(Ω)2》求(qiu)鋁(lv)芯電(dian)(dian)線(xian)(xian)(單(dan)線(xian)(xian))截面：S=ρ×L/R=0.0283×300/1.9≈8.49/0.94≈9.03(平方(fang))所以(yi)應選擇10平方(fang)。
鋁芯線(xian)(xian)相對比銅芯線(xian)(xian)的(de)價格要低(di)，可以(yi)考慮16平方的(de)電線(xian)(xian)。
