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      在現代用電企業中，在數(shu)量眾多(duo)、容量大小不等的感性設備連接于電力系統中，以致電網(wang)傳(chuan)輸功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)除有功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)外(wai)，還有無(wu)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)。如，自然平均功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)因(yin)數(shu)在0.70～0.85之間。企業消(xiao)(xiao)耗(hao)電網(wang)的無(wu)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)約占(zhan)消(xiao)(xiao)耗(hao)有功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)的60%～90%,如果把功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)因(yin)數(shu)提高到0.95左(zuo)右(you)，則無(wu)功(gong)(gong)(gong)(gong)(gong)(gong)消(xiao)(xiao)耗(hao)只占(zhan)有功(gong)(gong)(gong)(gong)(gong)(gong)消(xiao)(xiao)耗(hao)的30%左(zuo)右(you)。由(you)于減少了電網(wang)無(wu)功(gong)(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)(gong)率(lv)(lv)的輸入，會給用電企業帶(dai)來效益(yi)。

  1、節省企業電費開支。提高功率因數對企業的直接經濟效益是明顯的，因為國家電價制度中，從合理利用有限電能出發，對不同企業的功率因數規定了要求達到的不同數值，低于規定的數值，需要多收電費，高于規定數值，可相應地減少電費。可見，提高功率因數對企業有著重要的經濟意義。
  2、提高設備的利用率。對于原有供電設備來講，在同樣有功功率下，因功率因數的提高，負荷電流減少，因此向負荷傳送功率所經過的變壓器、開關和導線等供配電設備都增加了功率儲備，從而滿足了負荷增長的需要。如果原網絡已趨于過載，由于功率因數的提高，輸送無功電流的減少，使系統不致于過載運行，從而發揮原有設備的潛力。對尚處于設計階段的新建企業來說則能降低設備容量，減少投資費用，在一定條件下，改善后的功率因數可以使所選變壓器容量降低。因此，使用無功補償不但減少初次投資費用，而且減少了運行后的基本電費。