電(dian)力(li)電(dian)容(rong)(rong)器(qi)無功補(bu)償裝(zhuang)置具有安裝(zhuang)方便(bian)，安裝(zhuang)地點增(zeng)減(jian)方便(bian)；有功損(sun)耗小(僅為(wei)額(e)定容(rong)(rong)量的0.4 %左右(you));建(jian)設周期(qi)短；投資小；無旋轉部(bu)件(jian)，運(yun)行維護簡便(bian)；個(ge)別電(dian)容(rong)(rong)器(qi)組損(sun)壞，不(bu)影響整個(ge)電(dian)容(rong)(rong)器(qi)組運(yun)行等優點。高壓(ya)分散補(bu)償實際就是(shi)在單臺(tai)變壓(ya)器(qi)高壓(ya)側(ce)安裝(zhuang)的，用以改善電(dian)源電(dian)壓(ya)質量的無功補(bu)償電(dian)容(rong)(rong)器(qi)。其主要用于(yu)城市(shi)高壓(ya)配電(dian)中。

冶(ye)金(jin)行業無功補(bu)償(chang)元(yuan)件的必要性

2000年之前生產的低(di)電(dian)(dian)(dian)壓(ya)(ya)(ya)并聯(lian)電(dian)(dian)(dian)容器(qi)的額定電(dian)(dian)(dian)壓(ya)(ya)(ya)大多數是400V，而隨著農網改(gai)造和電(dian)(dian)(dian)能質量的不斷提高(gao)，目前，電(dian)(dian)(dian)網電(dian)(dian)(dian)壓(ya)(ya)(ya)特別是配(pei)電(dian)(dian)(dian)變(bian)壓(ya)(ya)(ya)器(qi)的首端，電(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)壓(ya)(ya)(ya)一般都要超過(guo)400V，有的達420V左右。而低(di)壓(ya)(ya)(ya)無功補償裝(zhuang)置(zhi)柜都是安(an)裝(zhuang)在配(pei)電(dian)(dian)(dian)變(bian)壓(ya)(ya)(ya)器(qi)低(di)壓(ya)(ya)(ya)線(xian)母線(xian)側，處于電(dian)(dian)(dian)源(yuan)的 前端，此時，電(dian)(dian)(dian)容器(qi)長期在高(gao)于其額定電(dian)(dian)(dian)壓(ya)(ya)(ya)狀態下運行(xing)，縮短了壽命。

在(zai)A相(xiang)(xiang)(xiang)(xiang)與(yu)(yu)C相(xiang)(xiang)(xiang)(xiang)之(zhi)(zhi)間接(jie)(jie)入(ru)(ru)一(yi)個(ge)適當的電(dian)(dian)(dian)感(gan)(gan)L1將(jiang)A相(xiang)(xiang)(xiang)(xiang)有功(gong)電(dian)(dian)(dian)流的1/3轉移到C相(xiang)(xiang)(xiang)(xiang)，在(zai)A相(xiang)(xiang)(xiang)(xiang)與(yu)(yu)B相(xiang)(xiang)(xiang)(xiang)之(zhi)(zhi)間接(jie)(jie)入(ru)(ru)一(yi)個(ge)適當的電(dian)(dian)(dian)容(rong)(rong)(rong)C1將(jiang)A相(xiang)(xiang)(xiang)(xiang)有功(gong)電(dian)(dian)(dian)流的1/3轉移到B相(xiang)(xiang)(xiang)(xiang)，這時電(dian)(dian)(dian)感(gan)(gan)L1在(zai)A相(xiang)(xiang)(xiang)(xiang)產(chan)(chan)生的感(gan)(gan)性(xing)(xing)無(wu)功(gong)電(dian)(dian)(dian)流恰(qia)好將(jiang)電(dian)(dian)(dian)容(rong)(rong)(rong)C1在(zai)A相(xiang)(xiang)(xiang)(xiang)產(chan)(chan)生的容(rong)(rong)(rong)性(xing)(xing)無(wu)功(gong)電(dian)(dian)(dian)流抵(di)消掉。在(zai)B相(xiang)(xiang)(xiang)(xiang)與(yu)(yu)零(ling)線(xian)(xian)之(zhi)(zhi)間接(jie)(jie)入(ru)(ru)一(yi)個(ge)電(dian)(dian)(dian)感(gan)(gan)L2將(jiang)電(dian)(dian)(dian)容(rong)(rong)(rong)C1在(zai)B相(xiang)(xiang)(xiang)(xiang)產(chan)(chan)生的容(rong)(rong)(rong)性(xing)(xing)無(wu)功(gong)電(dian)(dian)(dian)流抵(di)消掉。在(zai)C相(xiang)(xiang)(xiang)(xiang)與(yu)(yu)零(ling)線(xian)(xian)之(zhi)(zhi)間接(jie)(jie)入(ru)(ru)一(yi)個(ge)電(dian)(dian)(dian)容(rong)(rong)(rong)C2將(jiang)電(dian)(dian)(dian)感(gan)(gan)L1在(zai)C相(xiang)(xiang)(xiang)(xiang)產(chan)(chan)生的感(gan)(gan)性(xing)(xing)無(wu)功(gong)電(dian)(dian)(dian)流抵(di)消掉。于(yu)是(shi)三相(xiang)(xiang)(xiang)(xiang)電(dian)(dian)(dian)流完全平衡，并且三相(xiang)(xiang)(xiang)(xiang)的功(gong)率因數全等于(yu)1。