在我國(guo)對電網系統進行建設(she)的(de)過程里，無功補償(chang)的(de)容(rong)量(liang)不(bu)充(chong)足以(yi)及電網配備的(de)不(bu)合(he)理不(bu)科學(xue)是現(xian)(xian)在所發現(xian)(xian)的(de)一(yi)(yi)個(ge) 難解決的(de)問題(ti)，尤其是無功補償(chang)的(de)容(rong)量(liang)不(bu)充(chong)足這一(yi)(yi)點尤為嚴重。在這種應(ying)用中考慮熔斷器保(bao)護(hu)時(shi)，應(ying)該把電容(rong)器和串聯電抗器作為一(yi)(yi)個(ge)整體來分析，因(yin)為補償(chang)回路中除了要承載正常(chang)的(de)基波無功電流外，還應(ying)該允許它(ta)能夠承載一(yi)(yi)定(ding)量(liang)的(de)諧波電流。

諧(xie)波嚴重場合無功補償補償原理與優缺點

對具有多段(duan)串聯的電容(rong)器(qi)組，在(zai)人(ren)接觸(chu)之前(qian)還(huan)(huan)應(ying)將串聯段(duan)連接點對地短(duan)路放(fang)(fang)(fang)電。電容(rong)器(qi)如果是(shi)內部斷線(xian)，熔絲熔斷或引(yin)線(xian)接觸(chu)不(bu)良，其兩極(ji)間(jian)還(huan)(huan)可(ke)能有殘余電荷(he)，這(zhe)樣在(zai)自(zi)動放(fang)(fang)(fang)電或人(ren)工放(fang)(fang)(fang)電時，它的殘余電荷(he)是(shi)不(bu)會被放(fang)(fang)(fang)掉的。所以，運行或檢修人(ren)員在(zai)接觸(chu)故障電容(rong)器(qi)前(qian)，還(huan)(huan)應(ying)戴好絕緣手套，用短(duan)路線(xian)短(duan)接故障電容(rong)器(qi)的兩極(ji)，使其放(fang)(fang)(fang)電。

并且(qie)，這種能(neng)(neng)是在電(dian)(dian)(dian)(dian)(dian)(dian)網中(zhong)與電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(neng)進行周期性轉換，這部(bu)分(fen)功(gong)率稱為無功(gong)功(gong)率，如(ru)電(dian)(dian)(dian)(dian)(dian)(dian)磁元(yuan)(yuan)件建(jian)立磁場占(zhan)用的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(neng)，電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)器建(jian)立電(dian)(dian)(dian)(dian)(dian)(dian)場所占(zhan)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)能(neng)(neng).電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)在電(dian)(dian)(dian)(dian)(dian)(dian)感元(yuan)(yuan)件中(zhong)作(zuo)功(gong)時，電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)滯后于電(dian)(dian)(dian)(dian)(dian)(dian)壓90°。而電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)在電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)元(yuan)(yuan)件中(zhong)作(zuo)功(gong)時，電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)超(chao)前電(dian)(dian)(dian)(dian)(dian)(dian)壓90°。在同一電(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)，電(dian)(dian)(dian)(dian)(dian)(dian)感電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)與電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)方(fang)向相(xiang)反，互差180°。如(ru)果在電(dian)(dian)(dian)(dian)(dian)(dian)磁元(yuan)(yuan)件電(dian)(dian)(dian)(dian)(dian)(dian)路中(zhong)有比例地安裝(zhuang)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)元(yuan)(yuan)件，使兩者的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)相(xiang)互抵消，使電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)(de)矢(shi)量與電(dian)(dian)(dian)(dian)(dian)(dian)壓矢(shi)量之間的(de)(de)(de)(de)夾角(jiao)縮小，就能(neng)(neng)達到(dao)無功(gong)補償的(de)(de)(de)(de)目(mu)的(de)(de)(de)(de)。