根據用(yong)(yong)電(dian)(dian)(dian)設備的(de)(de)功(gong)(gong)率(lv)因數，可測算輸電(dian)(dian)(dian)線路的(de)(de)電(dian)(dian)(dian)能損失(shi)。通過現(xian)場技(ji)術改造，可使低(di)于標準要求的(de)(de)功(gong)(gong)率(lv)因數達標，實現(xian)節(jie)電(dian)(dian)(dian)目的(de)(de)。采用(yong)(yong)無(wu)功(gong)(gong)補償(chang)技(ji)術，提高低(di)壓電(dian)(dian)(dian)網(wang)和用(yong)(yong)電(dian)(dian)(dian)設備的(de)(de)功(gong)(gong)率(lv)因數，是節(jie)電(dian)(dian)(dian)工作的(de)(de)一項重要措(cuo)施(shi)。無(wu)功(gong)(gong)補償(chang)，它就(jiu)是借助于無(wu)功(gong)(gong)補償(chang)設備提花必(bi)要的(de)(de)無(wu)功(gong)(gong)功(gong)(gong)率(lv)，以提高系統的(de)(de)功(gong)(gong)率(lv)因數，降低(di)能耗(hao)，改善電(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)壓質量，穩定設備運(yun)行。

電(dian)力(li)中(zhong)無功補(bu)償元件的(de)(de)成因、性(xing)質及對其進行的(de)(de)補(bu)償

采用(yong)電力(li)半(ban)導體(ti)器件(jian)作為電容(rong)器組(zu)的(de)(de)投(tou)切(qie)開關，較常采用(yong)的(de)(de)接(jie)線(xian)方式如(ru)圖2。圖中BK為半(ban)導體(ti)器件(jian)，C1為電容(rong)器組(zu)。這種接(jie)線(xian)方式采用(yong)2組(zu)開關，另一(yi)相直(zhi)接(jie)接(jie)電網(wang)省去一(yi)組(zu)開關，有很(hen)多優越性。動態補償(chang)(chang)的(de)(de)補償(chang)(chang)效果(guo)(guo)還要(yao)看控(kong)制(zhi)器是(shi)否有較高的(de)(de)性能(neng)及參數(shu)，還有很(hen)重要(yao)的(de)(de)一(yi)項就是(shi)要(yao)求(qiu)控(kong)制(zhi)器要(yao)有良好的(de)(de)動態響應時間，準確(que)的(de)(de)投(tou)切(qie)功率(lv)，還要(yao)有較高的(de)(de)自識別能(neng)力(li)，這樣(yang)才能(neng)達(da)到 佳的(de)(de)補償(chang)(chang)效果(guo)(guo)。

投(tou)入(ru)相(xiang)應的(de)單(dan)相(xiang)電(dian)(dian)(dian)容(rong)器(qi)后(hou)(hou)，三相(xiang)的(de)電(dian)(dian)(dian)流都有所(suo)減小(xiao)，三相(xiang)間的(de)不平衡(heng)程度沒有變化(hua)，未(wei)投(tou)電(dian)(dian)(dian)容(rong)器(qi)前C相(xiang)與A相(xiang)的(de)電(dian)(dian)(dian)流比(bi)電(dian)(dian)(dian)容(rong)器(qi)為2:1，投(tou)入(ru)電(dian)(dian)(dian)容(rong)器(qi)后(hou)(hou)C相(xiang)與A相(xiang)的(de)電(dian)(dian)(dian)流比(bi)仍然是(shi)2:1。投(tou)入(ru)電(dian)(dian)(dian)容(rong)器(qi)后(hou)(hou)的(de)零線電(dian)(dian)(dian)流減小(xiao)，這是(shi)因為零線中的(de)不平衡(heng)無功(gong)電(dian)(dian)(dian)流被(bei)消(xiao)除掉了，只(zhi)剩下不平衡(heng)的(de)有功(gong)電(dian)(dian)(dian)流部分。從(cong)此例(li)可(ke)以看出，在三相(xiang)電(dian)(dian)(dian)流嚴重不平衡(heng)的(de)系統中應用(yong)(yong)時(shi)，單(dan)相(xiang)電(dian)(dian)(dian)容(rong)器(qi)分相(xiang)投(tou)切的(de)補償裝置(zhi)比(bi)三相(xiang)電(dian)(dian)(dian)容(rong)器(qi)同(tong)時(shi)投(tou)切的(de)補償裝置(zhi)的(de)使用(yong)(yong)效果(guo)要好(hao)一些(xie)。