當電(dian)(dian)力系統中的負載具(ju)有(you)儲能(neng)(neng)元件的時候，就(jiu)會(hui)有(you)無功(gong)功(gong)率產(chan)生(sheng)，像電(dian)(dian)容、電(dian)(dian)感(gan)都是使用普遍的儲能(neng)(neng)元件。電(dian)(dian)阻負載消耗(hao)的有(you)功(gong)功(gong)率將(jiang)電(dian)(dian)能(neng)(neng)轉(zhuan)換成(cheng)為(wei)熱能(neng)(neng)，或者(zhe)進一步轉(zhuan)換成(cheng)其他(ta)形式。而電(dian)(dian)感(gan)和電(dian)(dian)容并不實(shi)際(ji)消耗(hao)能(neng)(neng)量，在一個周(zhou)期內會(hui)先將(jiang)電(dian)(dian)能(neng)(neng)轉(zhuan)換成(cheng)磁場能(neng)(neng)儲存(cun)起來(lai)，再釋放(fang)出來(lai)，返回電(dian)(dian)源。

首次裝置(zhi)無功補(bu)償(chang)柜的成(cheng)因、性質及(ji)對其進行的補(bu)償(chang)

繼電(dian)器(qi)與交流(liu)接(jie)(jie)觸器(qi)相配合組成(cheng)漏(lou)電(dian)保(bao)護裝置，適用于電(dian)源系統(tong)(tong)中性點直接(jie)(jie)接(jie)(jie)地(di)，低壓(ya)（380、220V）配電(dian)系統(tong)(tong)中，作間接(jie)(jie)接(jie)(jie)觸保(bao)護。在線路漏(lou)電(dian)流(liu)很小的場合，當其它保(bao)護失敗時(shi)，漏(lou)電(dian)保(bao)護裝置提供直接(jie)(jie)觸保(bao)護。安全(quan)、省電(dian)、方便、抗擊。

為此(ci)，對無功補(bu)償功率較大的(de)電(dian)(dian)(dian)(dian)容(rong)器，如需(xu)接在(zai)電(dian)(dian)(dian)(dian)源進(jin)線側，則應(ying)(ying)對電(dian)(dian)(dian)(dian)容(rong)器另外加(jia)控制開關，在(zai)電(dian)(dian)(dian)(dian)動機(ji)停運(yun)時予以切除。就地(di)補(bu)償的(de)電(dian)(dian)(dian)(dian)容(rong)器不宜采用普通(tong)(tong)電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)容(rong)器：推廣就地(di)補(bu)償技術(shu)時，不宜直接使用普通(tong)(tong)油浸紙(zhi)質電(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)容(rong)器，因為其自愈功能很差(cha)，使用中可能產生性擊穿，甚(shen)至引起爆炸，危及人(ren)身安全。 應(ying)(ying)用選型需(xu)要考慮的(de)因素