防(fang)爆(bao)電(dian)(dian)(dian)(dian)機運(yun)行(xing)時，所消耗(hao)的(de)(de)功(gong)(gong)(gong)(gong)率(lv)(lv)包括有(you)(you)功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)和(he)(he)無(wu)(wu)功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)兩(liang)個分量。有(you)(you)功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)是用(yong)于(yu)防(fang)爆(bao)電(dian)(dian)(dian)(dian)機產(chan)生機械轉(zhuan)矩(ju)并(bing)且驅動負(fu)(fu)載所需的(de)(de)功(gong)(gong)(gong)(gong)率(lv)(lv)，它的(de)(de)電(dian)(dian)(dian)(dian)流隨(sui)負(fu)(fu)載的(de)(de)增加而(er)增加，而(er)無(wu)(wu)功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)，則(ze)是用(yong)于(yu)防(fang)爆(bao)電(dian)(dian)(dian)(dian)機內部(bu)的(de)(de)電(dian)(dian)(dian)(dian)場(chang)與磁場(chang)隨(sui)著電(dian)(dian)(dian)(dian)源頻率(lv)(lv)的(de)(de)反復變化(hua)，在(zai)(zai)負(fu)(fu)載與電(dian)(dian)(dian)(dian)源之間不(bu)斷地進(jin)行(xing)能量交(jiao)換時所消耗(hao)的(de)(de)功(gong)(gong)(gong)(gong)率(lv)(lv)。無(wu)(wu)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流在(zai)(zai)負(fu)(fu)載變化(hua)的(de)(de)情況下，其變化(hua)很(hen)微小(xiao)，在(zai)(zai)相(xiang)位上，電(dian)(dian)(dian)(dian)流的(de)(de)變化(hua)總(zong)是滯后于(yu)電(dian)(dian)(dian)(dian)壓(ya)90°，所以是純電(dian)(dian)(dian)(dian)感性質(zhi)的(de)(de)。在(zai)(zai)實際運(yun)行(xing)中，電(dian)(dian)(dian)(dian)源供給防(fang)爆(bao)電(dian)(dian)(dian)(dian)機的(de)(de)總(zong)電(dian)(dian)(dian)(dian)流是有(you)(you)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流和(he)(he)無(wu)(wu)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流的(de)(de)矢(shi)量和(he)(he)，當防(fang)爆(bao)電(dian)(dian)(dian)(dian)機處(chu)于(yu)滿負(fu)(fu)荷運(yun)行(xing)時，有(you)(you)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流大于(yu)無(wu)(wu)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流，總(zong)電(dian)(dian)(dian)(dian)流的(de)(de)功(gong)(gong)(gong)(gong)率(lv)(lv)因數(shu)較高，而(er)當負(fu)(fu)載下降時，有(you)(you)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流減小(xiao)，無(wu)(wu)功(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流基本不(bu)變，所以功(gong)(gong)(gong)(gong)率(lv)(lv)因數(shu)降低。

可以這樣認為：當防爆電(dian)機(ji)的輸(shu)出功(gong)(gong)率(lv)(lv)(lv)一定時，功(gong)(gong)率(lv)(lv)(lv)因數(shu)越低(di)，就意味著(zhu)其所(suo)需(xu)的無(wu)功(gong)(gong)功(gong)(gong)率(lv)(lv)(lv)越大，因而造(zao)成的損(sun)(sun)耗(hao)(hao)也較(jiao)大。實(shi)踐證明，無(wu)功(gong)(gong)功(gong)(gong)率(lv)(lv)(lv)所(suo)產(chan)生的電(dian)能(neng)損(sun)(sun)耗(hao)(hao)，主要是發(fa)生在輸(shu)配(pei)電(dian)線(xian)路(lu)上的，對于那些(xie)距離(li)電(dian)源較(jiao)遠，線(xian)路(lu)電(dian)阻(zu)R比較(jiao)大，防爆電(dian)機(ji)運行功(gong)(gong)率(lv)(lv)(lv)因數(shu)低(di)的終端設備，所(suo)造(zao)成的無(wu)功(gong)(gong)損(sun)(sun)耗(hao)(hao)就更加突出了。