防(fang)(fang)爆(bao)電(dian)(dian)(dian)(dian)機(ji)(ji)運(yun)行(xing)時(shi)，所(suo)(suo)消(xiao)耗的(de)(de)(de)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)包括有(you)(you)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)和無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)兩個分(fen)量。有(you)(you)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)是(shi)(shi)(shi)用于(yu)防(fang)(fang)爆(bao)電(dian)(dian)(dian)(dian)機(ji)(ji)產生機(ji)(ji)械轉矩并且驅(qu)動負載(zai)所(suo)(suo)需的(de)(de)(de)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)，它的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)隨負載(zai)的(de)(de)(de)增加而增加，而無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)，則是(shi)(shi)(shi)用于(yu)防(fang)(fang)爆(bao)電(dian)(dian)(dian)(dian)機(ji)(ji)內部的(de)(de)(de)電(dian)(dian)(dian)(dian)場(chang)與磁(ci)場(chang)隨著(zhu)電(dian)(dian)(dian)(dian)源頻率(lv)(lv)的(de)(de)(de)反(fan)復變(bian)(bian)(bian)化(hua)，在(zai)(zai)(zai)負載(zai)與電(dian)(dian)(dian)(dian)源之(zhi)間不斷地進行(xing)能量交換時(shi)所(suo)(suo)消(xiao)耗的(de)(de)(de)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)。無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)在(zai)(zai)(zai)負載(zai)變(bian)(bian)(bian)化(hua)的(de)(de)(de)情況下(xia)，其(qi)變(bian)(bian)(bian)化(hua)很微小，在(zai)(zai)(zai)相(xiang)位上，電(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)變(bian)(bian)(bian)化(hua)總(zong)是(shi)(shi)(shi)滯后于(yu)電(dian)(dian)(dian)(dian)壓90°，所(suo)(suo)以(yi)是(shi)(shi)(shi)純電(dian)(dian)(dian)(dian)感性質的(de)(de)(de)。在(zai)(zai)(zai)實(shi)際(ji)運(yun)行(xing)中，電(dian)(dian)(dian)(dian)源供給防(fang)(fang)爆(bao)電(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)總(zong)電(dian)(dian)(dian)(dian)流(liu)是(shi)(shi)(shi)有(you)(you)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)和無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)矢量和，當(dang)防(fang)(fang)爆(bao)電(dian)(dian)(dian)(dian)機(ji)(ji)處于(yu)滿負荷運(yun)行(xing)時(shi)，有(you)(you)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)大于(yu)無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)，總(zong)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)因數較高，而當(dang)負載(zai)下(xia)降時(shi)，有(you)(you)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)減小，無(wu)(wu)(wu)功(gong)(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)流(liu)基本不變(bian)(bian)(bian)，所(suo)(suo)以(yi)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)因數降低(di)。

可(ke)以這(zhe)樣認為：當(dang)防爆電機的(de)輸(shu)出(chu)功(gong)(gong)(gong)率(lv)一定時，功(gong)(gong)(gong)率(lv)因(yin)數(shu)越(yue)低(di)，就意味著(zhu)其(qi)所需的(de)無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)越(yue)大(da)，因(yin)而(er)造(zao)成的(de)損耗也較大(da)。實踐證明，無功(gong)(gong)(gong)功(gong)(gong)(gong)率(lv)所產生(sheng)的(de)電能損耗，主要是發(fa)生(sheng)在輸(shu)配電線路上的(de)，對于那些距離電源較遠，線路電阻R比較大(da)，防爆電機運(yun)行功(gong)(gong)(gong)率(lv)因(yin)數(shu)低(di)的(de)終(zhong)端設備，所造(zao)成的(de)無功(gong)(gong)(gong)損耗就更加(jia)突出(chu)了。