低壓無功自動補償(chang)裝(zhuang)置通過安裝(zhuang)在控制柜(ju)內的(de)自動無功補償(chang)控制器的(de)動作(zuo)，自動接(jie)通和斷開(kai)控制柜(ju)內的(de)并聯電(dian)(dian)容器組，從而(er)將電(dian)(dian)網(wang)無功功率消(xiao)耗保持在低狀態，從而(er)提(ti)高(gao)電(dian)(dian)網(wang)電(dian)(dian)壓質量，降(jiang)低輸電(dian)(dian)系統和變壓器的(de)損耗。同時(shi)，也可以通過轉換開(kai)關手動控制并聯電(dian)(dian)容器組的(de)切換。

汽車生(sheng)產(chan)線無功(gong)補(bu)償(chang)模組的成因、性質(zhi)及對其進行(xing)的補(bu)償(chang)

交流(liu)(liu)電(dian)(dian)源所(suo)能(neng)提供的(de)總(zong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，稱之為(wei)“視(shi)在(zai)(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)”或“表現功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)”，在(zai)(zai)數值上是交流(liu)(liu)電(dian)(dian)路中(zhong)電(dian)(dian)壓(ya)(ya)與電(dian)(dian)流(liu)(liu)的(de)乘積。視(shi)在(zai)(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)用字母S表示，即(ji)S=U×I，單(dan)位(wei)是伏(fu)安（VA）或千(qian)伏(fu)安（KVA）。它通常(chang)用來(lai)表示交流(liu)(liu)電(dian)(dian)源設備(bei)（如變壓(ya)(ya)器）的(de)容量(liang)大小。視(shi)在(zai)(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)既不(bu)等于(yu)有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，也不(bu)等于(yu)無功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，但它既包含(han)有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)又(you)包含(han)無功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)。能(neng)否使視(shi)在(zai)(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)為(wei)800KVA的(de)變壓(ya)(ya)器輸出800KW的(de)有功(gong)(gong)(gong)(gong)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)，主要取決于(yu)負載的(de)功(gong)(gong)(gong)(gong)率(lv)(lv)(lv)因數。

在(zai)供配電(dian)(dian)系(xi)(xi)統中，評(ping)價供電(dian)(dian)質(zhi)量(liang)有三個因(yin)素:(1)供電(dian)(dian)點(dian)的電(dian)(dian)壓和(he)頻率(lv)是(shi)否(fou)(fou)接(jie)近恒定(ding)。(2)功(gong)(gong)率(lv)因(yin)數是(shi)否(fou)(fou)接(jie)近1。(3)三相(xiang)系(xi)(xi)統中，相(xiang)電(dian)(dian)流和(he)相(xiang)電(dian)(dian)壓是(shi)否(fou)(fou)趨于平衡。利用無(wu)功(gong)(gong)補償(chang)(chang)提(ti)高(gao)功(gong)(gong)率(lv)因(yin)數，不僅可(ke)以大大降低線路中無(wu)功(gong)(gong)電(dian)(dian)流傳輸造成的功(gong)(gong)率(lv)損耗，而且可(ke)以有效提(ti)高(gao)終端用戶電(dian)(dian)壓，提(ti)高(gao)電(dian)(dian)氣設備的經濟運行水(shui)平。因(yin)此，無(wu)功(gong)(gong)補償(chang)(chang)一直(zhi)是(shi)供配電(dian)(dian)系(xi)(xi)統中非常重要(yao)的一個環節。