為什么無功補償電容柜要加電抗器
無功補償柜的(de)作(zuo)(zuo)用就是(shi)提(ti)高功率因數(shu),降低線路的(de)損耗(hao),增增加變壓器(qi)的(de)使(shi)用裕度。在電(dian)容器(qi)前端串聯電(dian)抗(kang)的(de)作(zuo)(zuo)用是(shi)防止電(dian)容器(qi)和(he)用電(dian)系統發生串、并聯諧振,導致諧波被放大,而使(shi)電(dian)容器(qi)過(guo)電(dian)流而損壞,其次的(de)話串聯電(dian)抗(kang)器(qi)還可(ke)以起到限制涌流的(de)作(zuo)(zuo)用。如1%的(de)電(dian)抗(kang)器(qi)只(zhi)是(shi)抑制電(dian)容器(qi)合閘(zha)瞬間的(de)涌流;6%電(dian)抗(kang)器(qi)是(shi)抑制5次及以上諧波的(de)。
電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)器(qi)(qi)分兩種:限(xian)(xian)流(liu)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)和(he)諧(xie)(xie)波(bo)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)。過去(qu)都(dou)是(shi)用限(xian)(xian)流(liu)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)+普通(tong)接(jie)觸(chu)器(qi)(qi),現在有專(zhuan)門切換電(dian)(dian)(dian)容器(qi)(qi)的接(jie)觸(chu)器(qi)(qi)了(le)(le),一(yi)般(ban)不再需要(yao)限(xian)(xian)流(liu)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang);當(dang)系統中(zhong)諧(xie)(xie)波(bo)較(jiao)大時(shi),應增加諧(xie)(xie)波(bo)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang),此時(shi)電(dian)(dian)(dian)容器(qi)(qi)要(yao)用消(xiao)諧(xie)(xie)電(dian)(dian)(dian)容器(qi)(qi),組成靜(jing)態補償和(he)濾除諧(xie)(xie)波(bo)裝置。一(yi)般(ban)為(wei)了(le)(le)減小響應時(shi)間,現在應考慮(lv)使用動(dong)態補償和(he)消(xiao)諧(xie)(xie)裝置。此外,當(dang)負荷中(zhong)諧(xie)(xie)波(bo)成分較(jiao)多(duo)的時(shi)候(如帶有電(dian)(dian)(dian)焊機,電(dian)(dian)(dian)爐等(deng)(deng))就必須加濾波(bo)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)器(qi)(qi),且濾波(bo)電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang)器(qi)(qi)要(yao)與(yu)系統中(zhong)的諧(xie)(xie)波(bo)次(ci)(ci)數相匹配(pei)(如主要(yao)為(wei)5、7次(ci)(ci)諧(xie)(xie)波(bo)的話匹配(pei)6%的電(dian)(dian)(dian)抗(kang)(kang)(kang)(kang))。并且此時(shi)電(dian)(dian)(dian)力(li)電(dian)(dian)(dian)容器(qi)(qi)的額定(ding)電(dian)(dian)(dian)壓要(yao)選高一(yi)等(deng)(deng)級。
電(dian)(dian)容(rong)(rong)補償柜(ju)中安裝電(dian)(dian)抗器(qi),有兩種目(mu)的:1.限制電(dian)(dian)容(rong)(rong)投入(ru)時的涌(yong)流。2.在(zai)(zai)存(cun)在(zai)(zai)大量(liang)諧(xie)波(bo)電(dian)(dian)流的系(xi)統(tong)中,串電(dian)(dian)抗器(qi)可以(yi)避免對(dui)諧(xie)波(bo)電(dian)(dian)流產生諧(xie)振放大,即所(suo)謂消(xiao)諧(xie)式電(dian)(dian)容(rong)(rong)器(qi)。
安徽得潤電氣無功補償柜使用ABB電抗器(qi),質量優,使用壽(shou)命長(chang),高(gao)達(da)二三(san)十年,提高(gao)功(gong)率因(yin)數(shu),降低線路的損耗,增(zeng)加變(bian)壓器(qi)的使用裕度。
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