無功補償裝置利用補償系統的無功功率來提高功率因數和抑制諧波，從而通過提高供電質量來降低線損和提高配電設備的運行效率。低壓三相電容器有(you)兩種常見的(de)補(bu)(bu)償方式(shi)，即無功集(ji)中補(bu)(bu)償和(he)無功就地補(bu)(bu)償。由于不(bu)同的(de)補(bu)(bu)償位置和(he)模式(shi)，兩種模式(shi)的(de)功能有(you)很大的(de)不(bu)同

低壓三相電容器比較抽象，它是用于電路內電場與磁場的交換，并用來在電氣設備中建立和維持磁場的電功率。它不對外作功，而是轉變為其他形式的能量。三相電容器廠家凡是有(you)(you)電(dian)磁線圈的電(dian)氣設備(bei)，要(yao)建立(li)磁場，就(jiu)要(yao)消(xiao)耗無(wu)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)。比(bi)如40瓦(wa)的日光燈，除需40多瓦(wa)有(you)(you)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)(鎮(zhen)(zhen)流器(qi)也需消(xiao)耗一部分有(you)(you)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv))來發光外(wai)，還需80乏左右的無(wu)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)供鎮(zhen)(zhen)流器(qi)的線圈建立(li)交變磁場用(yong)。由于(yu)它不(bu)對外(wai)做(zuo)功(gong)(gong)(gong)(gong)(gong)，才被稱之為(wei)“無(wu)功(gong)(gong)(gong)(gong)(gong)”。無(wu)功(gong)(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)(gong)率(lv)的符號用(yong)Q表(biao)示，單位(wei)為(wei)乏(Var)或(huo)千乏(kVar)。

四川三相電容器具有自己的操作面板和LCD顯示屏，可顯示完整的數據。 它可以顯示內容，包括配電電壓，配電電流，配電功率因數，低壓三相電容器自身的工作電流以及電容器外殼中的溫度。

通常情況下，電氣設備不僅需要從電源獲取有功功率，而且還需要從電源獲取低壓三相電容器。如果電(dian)(dian)網中(zhong)的無功(gong)(gong)功(gong)(gong)率(lv)供應超過(guo)需求，則電(dian)(dian)氣(qi)(qi)(qi)設(she)備(bei)將沒有(you)足夠的無功(gong)(gong)功(gong)(gong)率(lv)來建立正(zheng)常的電(dian)(dian)磁(ci)場，這些電(dian)(dian)氣(qi)(qi)(qi)設(she)備(bei)將無法(fa)在額定條件下運行(xing)，并且電(dian)(dian)氣(qi)(qi)(qi)設(she)備(bei)的端(duan)電(dian)(dian)壓將下降(jiang)，這會影響電(dian)(dian)氣(qi)(qi)(qi)設(she)備(bei)的正(zheng)常運行(xing)。

打開低壓三相電容器前必須先斷開斷路器或隔離開關，讓高壓電容補償柜的放電裝置自動放電，三分鐘后方可打開柜門，打開柜門后須人工放電。高壓電容補償在運行中發出特殊響聲是內部絕緣崩潰先兆，應立即停止運行，查找故障高壓電容補償。高壓三相電容器外殼膨脹是(shi)過電壓引起介質分(fen)解析出氣體，應立(li)即停止運行查找(zhao)故(gu)障高壓電容補償(chang)。