由于各行各業對電能質量的要求越來越高,許多企業開始選擇電力補償電容器進行無功功率補償。
今天,我想談談電(dian)容(rong)運(yun)(yun)(yun)行(xing)中(zhong)更重(zhong)要的幾個(ge)“數據(ju)指(zhi)標(biao)”:運(yun)(yun)(yun)行(xing)電(dian)流、運(yun)(yun)(yun)行(xing)電(dian)壓、運(yun)(yun)(yun)行(xing)溫(wen)度(du)。
運行電流
在實際運(yun)行中(zhong),電力補(bu)償(chang)電容(rong)器的額定電流應小于(yu)1.3倍,否(fou)則(ze)可(ke)能導致補(bu)償(chang)電容(rong)器與相(xiang)關(guan)設備之(zhi)間的連續(xu)故障(zhang)。如(ru)果(guo)補(bu)償(chang)電容(rong)器實際運(yun)行中(zhong)出現過電流現象,需要首(shou)次分析電容(rong)器運(yun)行電流高(gao)于(yu)額定電流的原(yuan)因。
一般(ban)來說,運行(xing)(xing)電(dian)流過高意味(wei)著電(dian)容器正(zheng)在(zai)過壓運行(xing)(xing),最好的(de)解決(jue)辦法是先退出運行(xing)(xing)。
另外,如(ru)果(guo)運行電流因(yin)系統(tong)諧(xie)波(bo)而增大(da),則需要安裝電抗器來進行諧(xie)波(bo)“消除”避免產生(sheng)諧(xie)波(bo)電流。
運行電壓
補償電容器應避免在過電壓條件(jian)下(xia)長期運行,否則會導致電容器超(chao)負荷運行,加熱現象(xiang)會越來越嚴(yan)重。
如(ru)果電(dian)(dian)(dian)(dian)力補償電(dian)(dian)(dian)(dian)容(rong)器的實際運行電(dian)(dian)(dian)(dian)壓是電(dian)(dian)(dian)(dian)容(rong)器額定電(dian)(dian)(dian)(dian)壓的1.1倍,電(dian)(dian)(dian)(dian)容(rong)器的實際使(shi)用壽命將大大降低,嚴重(zhong)時可能直接導致熱(re)擊穿(chuan)故(gu)障(zhang),導致電(dian)(dian)(dian)(dian)容(rong)器無法繼續使(shi)用。
運行溫度
為(wei)保(bao)證電(dian)力補償電(dian)容器的安(an)(an)全穩(wen)定(ding)運(yun)行(xing)(xing),必須保(bao)證其運(yun)行(xing)(xing)溫(wen)度在許可范圍內(一般不(bu)超過50℃)。如(ru)果補償電(dian)容器的運(yun)行(xing)(xing)溫(wen)度過高,會加(jia)速電(dian)容器內部絕緣老化,為(wei)無功(gong)補償埋下安(an)(an)全隱患。
為保證無功補償的安(an)全穩定,電力電容器運行時應特別注(zhu)意上述情況(kuang)“指標”!!