無功(gong)(gong)補(bu)償投(tou)(tou)(tou)切開(kai)關(guan)(guan)顧名思(si)義是(shi)用來在無功(gong)(gong)補(bu)償裝置中(zhong)控制(zhi)電(dian)容(rong)(rong)(rong)投(tou)(tou)(tou)入(ru)與切除的元件，無功(gong)(gong)補(bu)償投(tou)(tou)(tou)切元件又分(fen)(fen)為很(hen)多種類，大致可以分(fen)(fen)為機械(xie)開(kai)關(guan)(guan)類和電(dian)子開(kai)關(guan)(guan)類。剛開(kai)始應用于(yu)低壓電(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)投(tou)(tou)(tou)切的開(kai)關(guan)(guan)是(shi)交流(liu)(liu)接觸器(qi)(qi)(qi)，這(zhe)是(shi)一種傳統的電(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)投(tou)(tou)(tou)切方式，由(you)(you)于(yu)三相交流(liu)(liu)電(dian)的相位互成120°，對交流(liu)(liu)接觸器(qi)(qi)(qi)投(tou)(tou)(tou)切控制(zhi)，理(li)論上不(bu)存在 優(you)操作相位點(dian)（即投(tou)(tou)(tou)切瞬時不(bu)可選擇性），使得它投(tou)(tou)(tou)入(ru)或切除電(dian)網時，要產(chan)生(sheng)一個暫態的過(guo)渡過(guo)程，又因電(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)是(shi)電(dian)壓不(bu)能瞬變的器(qi)(qi)(qi)件，并聯電(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)由(you)(you)交流(liu)(liu)接觸器(qi)(qi)(qi)投(tou)(tou)(tou)切電(dian)網時，由(you)(you)于(yu)其相位點(dian)是(shi)隨機的，所(suo)以會產(chan)生(sheng)幅值很(hen)大、頻(pin)率很(hen)高的浪涌(yong)電(dian)流(liu)(liu)（涌(yong)流(liu)(liu) 大時可能超過(guo)100倍電(dian)容(rong)(rong)(rong)器(qi)(qi)(qi)額定電(dian)流(liu)(liu)）。

汽車生產(chan)線無功補償柜的主要作用(yong)

將無功(gong)補(bu)償技術用于(yu)高壓(ya)(ya)(ya)(ya)系統(tong)領域。目前無功(gong)補(bu)償技術還主要(yao)用于(yu)低(di)壓(ya)(ya)(ya)(ya)系統(tong)，高壓(ya)(ya)(ya)(ya)系統(tong)由于(yu)受到(dao)晶閘(zha)管耐壓(ya)(ya)(ya)(ya)水平的限制(zhi)，是(shi)通過(guo)變(bian)壓(ya)(ya)(ya)(ya)器接入的，如(ru)用于(yu)電(dian)氣化鐵道牽引變(bian)電(dian)所(suo)等。研制(zhi)高壓(ya)(ya)(ya)(ya)動態無功(gong)補(bu)償的裝置則具(ju)有重要(yao)意(yi)義，關鍵問題是(shi)要(yao)解決(jue)補(bu)償裝置晶閘(zha)管和(he)二極(ji)管的耐壓(ya)(ya)(ya)(ya)，即多個晶閘(zha)管元件串(chuan)聯及均壓(ya)(ya)(ya)(ya)、觸發(fa)控制(zhi)的同步性(xing)等。

總(zong)結：電(dian)(dian)容(rong)器在變配電(dian)(dian)所各(ge)種設備中屬于可(ke)(ke)靠性比較薄(bo)弱的(de)(de)電(dian)(dian)器，它比同級電(dian)(dian)壓的(de)(de)其他設備的(de)(de)絕(jue)緣(yuan)較為薄(bo)弱，內(nei)(nei)部元件發熱(re)較多，而散熱(re)情況(kuang)又(you)欠(qian)佳，內(nei)(nei)部故障機會較多，制造電(dian)(dian)力(li)電(dian)(dian)容(rong)器內(nei)(nei)部材料的(de)(de)可(ke)(ke)燃物成分又(you)大，所以(yi)運行中極易著火(huo)。因此，對電(dian)(dian)力(li)電(dian)(dian)容(rong)器的(de)(de)運行應盡可(ke)(ke)能(neng)地創(chuang)造良(liang)好的(de)(de)低溫和通風條件。