無功補償電(dian)容器主(zhu)要(yao)元件是由(you)聚丙烯鋅鋁鍍(du)膜制成(cheng)，隨(sui)(sui)著(zhu)電(dian)容器運(yun)行(xing)的(de)(de)時間長短，環(huan)境(jing)和(he)溫度(du)的(de)(de)關系(xi)，電(dian)容器介質(zhi)會(hui)產(chan)生(sheng)惡化，容量隨(sui)(sui)著(zhu)下(xia)(xia)降(jiang)，每(mei)年(nian)下(xia)(xia)降(jiang) 8~15%不等。測一下(xia)(xia)電(dian)容器的(de)(de)電(dian)流，電(dian)流下(xia)(xia)降(jiang)太大，也必須要(yao)更換(huan)，否則無功補償不夠。

首次裝(zhuang)置低壓補償(chang)模組(zu)的(de)成因、性質及(ji)對其進行的(de)補償(chang)

當(dang)電(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)壓(ya)過高(gao)(gao)時，將引(yin)起電(dian)(dian)(dian)(dian)容(rong)器內部有(you)功功率損耗顯(xian)著增加，使電(dian)(dian)(dian)(dian)容(rong)器介(jie)質遭受熱力擊(ji)穿，影響其使用壽命。另(ling)外(wai)電(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)壓(ya)過高(gao)(gao)時，除了電(dian)(dian)(dian)(dian)容(rong)器過載外(wai)，還會引(yin)起鄰近電(dian)(dian)(dian)(dian)器的(de)鐵芯磁通過飽和，從而產生高(gao)(gao)次諧波(bo)對電(dian)(dian)(dian)(dian)容(rong)器更不利(li)。有(you)些用電(dian)(dian)(dian)(dian)設備，對電(dian)(dian)(dian)(dian)壓(ya)波(bo)動很(hen)敏(min)感，例如白(bai)熾(chi)燈(deng)，當(dang)電(dian)(dian)(dian)(dian)壓(ya)升高(gao)(gao)5％時，壽命將縮短(duan)50％，白(bai)熾(chi)燈(deng)由于電(dian)(dian)(dian)(dian)壓(ya)升高(gao)(gao)燒毀燈(deng)泡的(de)事已屢見不鮮。

過補償(chang)(chang)既不經(jing)濟也不合理(li)，當系統(tong)負(fu)載性質轉(zhuan)換為容性時，在功(gong)率因(yin)數超過1以后(hou)，反而降低。而且在超過l的同時也可(ke)能引(yin)起電路電流(liu)諧(xie)振(zhen)。以上(shang)兩(liang)種(zhong)補償(chang)(chang)方(fang)式顯然都不可(ke)取。補償(chang)(chang)的基本原則(ze)就是必須采用欠補償(chang)(chang)方(fang)式，補償(chang)(chang)后(hou)的功(gong)率因(yin)數則(ze)要求(qiu)小于1，并且盡量(liang)接(jie)近1。為了防止諧(xie)振(zhen)，一般將上(shang)限確定在0.95。