通常(chang)情(qing)況(kuang)下，造成功(gong)(gong)(gong)(gong)率(lv)因(yin)數低的(de)(de)(de)原因(yin)是在供(gong)電(dian)(dian)(dian)(dian)(dian)系(xi)統中，絕大(da)多數用(yong)電(dian)(dian)(dian)(dian)(dian)設(she)備(bei)都具有電(dian)(dian)(dian)(dian)(dian)感的(de)(de)(de)特性(xing)（諸如：感性(xing)電(dian)(dian)(dian)(dian)(dian)動機，電(dian)(dian)(dian)(dian)(dian)力變壓器(qi)，電(dian)(dian)(dian)(dian)(dian)焊機等）。這些(xie)設(she)備(bei)不僅需要從(cong)電(dian)(dian)(dian)(dian)(dian)力系(xi)統吸收(shou)有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)，還(huan)要吸收(shou)無功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)以(yi)提(ti)供(gong)這些(xie)設(she)備(bei)正(zheng)常(chang)工作所(suo)需要的(de)(de)(de)交變磁(ci)場(chang)。然而在輸(shu)送有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)一定的(de)(de)(de)情(qing)況(kuang)下，無功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)增大(da)，就會(hui)降(jiang)低供(gong)電(dian)(dian)(dian)(dian)(dian)系(xi)統的(de)(de)(de)功(gong)(gong)(gong)(gong)率(lv)因(yin)數。因(yin)此，功(gong)(gong)(gong)(gong)率(lv)因(yin)數是衡(heng)量(liang)供(gong)電(dian)(dian)(dian)(dian)(dian)系(xi)統電(dian)(dian)(dian)(dian)(dian)能(neng)利(li)用(yong)程(cheng)度及(ji)電(dian)(dian)(dian)(dian)(dian)氣設(she)備(bei)使用(yong)狀況(kuang)的(de)(de)(de)一個具有代表性(xing)的(de)(de)(de)重(zhong)要指標(biao)，只有通過合(he)理配(pei)置無功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)補(bu)償設(she)備(bei)，提(ti)高系(xi)統的(de)(de)(de)功(gong)(gong)(gong)(gong)率(lv)因(yin)數，才能(neng)達到(dao)節約電(dian)(dian)(dian)(dian)(dian)能(neng)，降(jiang)低損耗的(de)(de)(de)目的(de)(de)(de)。
人工補償法提高功率因數
實際中可使用電路電容器或調相機，一般多采用電力電容器補償無功，即：在感性負載上并聯電容器。并聯電容器的補償方法又可分為：個別補償、分組補償、集中補償。
功率因數補償建議：
根據各分支電(dian)(dian)(dian)路(lu)及(ji)(ji)個別設(she)備的(de)(de)需(xu)要(yao)在用電(dian)(dian)(dian)線路(lu)中增(zeng)加并聯電(dian)(dian)(dian)容(rong)器(qi)，以補償(chang)設(she)備對(dui)無(wu)功(gong)功(gong)率需(xu)要(yao)，從(cong)而減少(shao)電(dian)(dian)(dian)力(li)系統中的(de)(de)電(dian)(dian)(dian)能損(sun)失。另(ling)定期(qi)對(dui)電(dian)(dian)(dian)力(li)系統中使用的(de)(de)補償(chang)電(dian)(dian)(dian)容(rong)器(qi)組成查檢，觀察電(dian)(dian)(dian)容(rong)器(qi)組是(shi)(shi)否有外殼(ke)膨脹、破裂、液體溢出、異(yi)味等現(xian)象，用儀器(qi)檢測電(dian)(dian)(dian)容(rong)器(qi)組是(shi)(shi)否過壓及(ji)(ji)過電(dian)(dian)(dian)流(liu)、表面溫度是(shi)(shi)否過高、三相(xiang)電(dian)(dian)(dian)壓及(ji)(ji)電(dian)(dian)(dian)流(liu)是(shi)(shi)否平衡等，以便能及(ji)(ji)時的(de)(de)更(geng)(geng)換損(sun)壞的(de)(de)電(dian)(dian)(dian)容(rong)器(qi)組（更(geng)(geng)換時必須將電(dian)(dian)(dian)容(rong)器(qi)內殘(can)余負(fu)荷放掉(diao)），從(cong)而保證功(gong)率因數的(de)(de)穩(wen)定，節約(yue)能源及(ji)(ji)費用。
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