無功補償柜的作用就是提高功率因數，降低線路的損耗，增加變壓器的使用裕度。在電容器前端串聯電抗的作用是防止電容器和用電系統發生串、并聯諧振，導致諧波被放大，而使電容器過電流而損壞，其次的話串(chuan)聯電(dian)抗器還可(ke)以起到限(xian)制涌流的作用(yong)。
電抗器分兩種：限流電抗和諧波電抗。過去都(dou)是用限流電(dian)(dian)(dian)抗(kang)+普通接觸(chu)器(qi)，現(xian)在(zai)有專門切換電(dian)(dian)(dian)容(rong)器(qi)的(de)(de)接觸(chu)器(qi)了，一(yi)般不再需(xu)要限流電(dian)(dian)(dian)抗(kang)；當系統(tong)(tong)中(zhong)諧(xie)(xie)波(bo)(bo)(bo)較(jiao)大(da)時(shi)，應增(zeng)加諧(xie)(xie)波(bo)(bo)(bo)電(dian)(dian)(dian)抗(kang)，此(ci)(ci)時(shi)電(dian)(dian)(dian)容(rong)器(qi)要用消諧(xie)(xie)電(dian)(dian)(dian)容(rong)器(qi)，組(zu)成靜態(tai)補償和濾除諧(xie)(xie)波(bo)(bo)(bo)裝置。一(yi)般為了減小響(xiang)應時(shi)間，現(xian)在(zai)都(dou)基本(ben)使用動態(tai)補償和消諧(xie)(xie)裝置。當負荷中(zhong)諧(xie)(xie)波(bo)(bo)(bo)成分較(jiao)多的(de)(de)時(shi)候(hou)(如(ru)帶有電(dian)(dian)(dian)焊機，電(dian)(dian)(dian)爐等)就(jiu)必須加濾波(bo)(bo)(bo)電(dian)(dian)(dian)抗(kang)器(qi)，且濾波(bo)(bo)(bo)電(dian)(dian)(dian)抗(kang)器(qi)要與系統(tong)(tong)中(zhong)的(de)(de)諧(xie)(xie)波(bo)(bo)(bo)次(ci)數相匹(pi)配(如(ru)主要為5、7次(ci)諧(xie)(xie)波(bo)(bo)(bo)的(de)(de)話匹(pi)配5.67%的(de)(de)電(dian)(dian)(dian)抗(kang))，并且此(ci)(ci)時(shi)電(dian)(dian)(dian)力(li)電(dian)(dian)(dian)容(rong)器(qi)的(de)(de)額定電(dian)(dian)(dian)壓要選高一(yi)等級(ji)。
如采用投切電容專用接觸器，要考慮合閘涌流問題，現在已經基本被晶閘管(guan)投切開關所取(qu)代。如(ru)是(shi)快(kuai)速變(bian)化(hua)場所（負載變(bian)化(hua)快(kuai)）可采用動態投切方式。如(ru)果是(shi)為了抑(yi)制(zhi)諧(xie)波諧(xie)振(zhen)，那么(me)要根據接入(ru)并聯(lian)電容器組處的(de)配電系統背景諧(xie)波的(de)主(zhu)要成分來(lai)決(jue)定電抗率。
希(xi)拓(tuo)電氣是一家(jia)知名的(de)無功(gong)補償裝(zhuang)置生產商(shang)，同(tong)時提供一站式(shi)電(dian)容柜(ju)改造解決方案。主(zhu)要產品包括：電(dian)容器、電(dian)抗器、晶閘管投切(qie)模塊，無(wu)(wu)功功率控(kong)制(zhi)器、低壓(ya)無(wu)(wu)功補償(chang)成套裝置、有源電(dian)力濾波器、靜止無(wu)(wu)功發生器及諧波保護器等。希拓(tuo)電(dian)氣，為污水(shui)處(chu)理(li)廠電(dian)能質量保駕護航，期待您的(de)來電咨詢！
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