低壓無功補償必須串聯電抗器嗎？

一(yi) 電(dian)(dian)容器的(de)電(dian)(dian)壓(ya)(ya)特性，電(dian)(dian)壓(ya)(ya)不(bu)能是(shi)暫態的(de)。當電(dian)(dian)源側開關的(de)電(dian)(dian)壓(ya)(ya)不(bu)是(shi)零(ling)(ling)時，電(dian)(dian)容器和電(dian)(dian)源側就會有電(dian)(dian)壓(ya)(ya)差(cha)，因為這部分(fen)設備(bei)的(de)阻抗很小，引線上會產(chan)生(sheng)高(gao)頻(pin)電(dian)(dian)流(liu)，可(ke)能會對(dui)設備(bei)造(zao)成(cheng)損壞。解(jie)決方法是(shi)電(dian)(dian)源側電(dian)(dian)壓(ya)(ya)為零(ling)(ling)，電(dian)(dian)壓(ya)(ya)差(cha)為零(ling)(ling)，不(bu)產(chan)生(sheng)勵(li)磁涌流(liu)。

二是增加電容器到電源側的阻抗，以減小勵磁涌流的大小，如串聯電抗器。當電(dian)(dian)抗(kang)器(qi)的尺寸適當時(shi)，可(ke)以(yi)防止(zhi)電(dian)(dian)容器(qi)和系統阻(zu)抗(kang)之間的共振。