一、功率表和功率因數表區別

功(gong)率(lv)因(yin)數指有功(gong)功(gong)率(lv)和視(shi)在功(gong)率(lv)的比值，一般用(yong)符號(hao)λ表示(shi)，即：λ=P/S。在正弦交流(liu)電路(lu)中，功(gong)率(lv)因(yin)數等于電壓與電流(liu)之間(jian)的相位差(cha)（ψ）的余(yu)弦值，用(yong)符號(hao)COSψ表示(shi)。此時，COSψ=λ。

功(gong)率因數(shu)表是指(zhi)單相(xiang)交(jiao)流電路或電壓對稱負載平衡(heng)的三相(xiang)交(jiao)流電路中(zhong)測(ce)量功(gong)率因數(shu)的儀表。常見的功(gong)率因數(shu)表有電動(dong)系(xi)、鐵磁電動(dong)系(xi)、電磁系(xi)和變換器式等幾種(zhong)。

功率表也叫瓦特(te)(te)表，是(shi)一(yi)種測量電功(gong)(gong)(gong)率(lv)(lv)的儀(yi)器。電功(gong)(gong)(gong)率(lv)(lv)包(bao)括有功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)(lv)、無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)(lv)和視(shi)在功(gong)(gong)(gong)率(lv)(lv)。未作特(te)(te)殊說(shuo)明時，功(gong)(gong)(gong)率(lv)(lv)表一(yi)般是(shi)指測量有功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)(lv)的儀(yi)表。

二、功率因數表能替代功率表嗎

功(gong)率因數表(biao)不能替代(dai)功(gong)率表(biao)，它們有著(zhu)不同的功(gong)能和應用場景。

功(gong)率(lv)因數(shu)表只(zhi)測量(liang)功(gong)率(lv)因數(shu)和(he)其(qi)他電氣參數(shu)，不能直(zhi)接測量(liang)實際(ji)功(gong)率(lv)和(he)其(qi)他功(gong)率(lv)值。而功(gong)率(lv)表則(ze)可以同時測量(liang)實際(ji)功(gong)率(lv)、有(you)功(gong)功(gong)率(lv)、無(wu)功(gong)功(gong)率(lv)和(he)視在功(gong)率(lv)等多個參數(shu)。

功率因數表和功率表的(de)(de)應用(yong)(yong)范圍也有所(suo)不同。功(gong)率因數(shu)表主要用(yong)(yong)于測量(liang)電(dian)路(lu)中的(de)(de)功(gong)率因數(shu)，通常(chang)應用(yong)(yong)于檢測電(dian)路(lu)中的(de)(de)無功(gong)功(gong)率和功(gong)率因數(shu)等參數(shu)，以優(you)化電(dian)路(lu)負載和提高電(dian)能(neng)利用(yong)(yong)效率。功(gong)率表則可用(yong)(yong)于測量(liang)電(dian)路(lu)中各種功(gong)率值，廣泛應用(yong)(yong)于家庭(ting)、工業、商業等領(ling)域中的(de)(de)電(dian)力(li)監測和控制。

三、功率因數和功率的關系

功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)和(he)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)的(de)關系是：功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)=有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)/視在功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)。功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)是有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)與視在功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)的(de)比值，它的(de)大(da)小與電路的(de)負載(zai)性(xing)質有關。對于(yu)電感設備比如電動機等，功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)小于(yu)1。有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)和(he)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)的(de)關系可以(yi)用公式(shi)P=UIcosφ表示，其(qi)中cosφ就是功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)(lv)(lv)(lv)因(yin)數(shu)。