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金泉電(dian)力向(xiang)您介(jie)紹環網柜的工作(zuo)原理

環網是指環形配(pei)電(dian)(dian)(dian)(dian)網，即供(gong)(gong)電(dian)(dian)(dian)(dian)干(gan)(gan)(gan)線(xian)(xian)形成一個(ge)閉合的環形，供(gong)(gong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)源(yuan)向這個(ge)環形干(gan)(gan)(gan)線(xian)(xian)供(gong)(gong)電(dian)(dian)(dian)(dian)，從(cong)(cong)干(gan)(gan)(gan)線(xian)(xian)上(shang)再一路(lu)一路(lu)地(di)通過高壓開關向外(wai)配(pei)電(dian)(dian)(dian)(dian)。這樣(yang)的好處是，每(mei)一個(ge)配(pei)電(dian)(dian)(dian)(dian)支路(lu)既可以從(cong)(cong)它(ta)的左側干(gan)(gan)(gan)線(xian)(xian)取(qu)電(dian)(dian)(dian)(dian)源(yuan)，又可以從(cong)(cong)它(ta)右側干(gan)(gan)(gan)線(xian)(xian)取(qu)電(dian)(dian)(dian)(dian)源(yuan)。當左側干(gan)(gan)(gan)線(xian)(xian)出了故障(zhang)，它(ta)就從(cong)(cong)右側干(gan)(gan)(gan)線(xian)(xian)繼續(xu)得(de)到(dao)(dao)供(gong)(gong)電(dian)(dian)(dian)(dian)，而當右側干(gan)(gan)(gan)線(xian)(xian)出了故障(zhang)，它(ta)就從(cong)(cong)左側干(gan)(gan)(gan)線(xian)(xian)繼續(xu)得(de)到(dao)(dao)供(gong)(gong)電(dian)(dian)(dian)(dian)，這樣(yang)一來，盡(jin)管總電(dian)(dian)(dian)(dian)源(yuan)是單路(lu)供(gong)(gong)電(dian)(dian)(dian)(dian)的，但從(cong)(cong)每(mei)一個(ge)配(pei)電(dian)(dian)(dian)(dian)支路(lu)來說卻(que)得(de)到(dao)(dao)類似于雙(shuang)路(lu)供(gong)(gong)電(dian)(dian)(dian)(dian)的實惠，從(cong)(cong)而提高了供(gong)(gong)電(dian)(dian)(dian)(dian)的可靠性。

所謂“環(huan)網柜(ju)(ju)”就(jiu)是(shi)每個配電支路設一臺(tai)(tai)開關柜(ju)(ju)（出線(xian)(xian)開關柜(ju)(ju)），這臺(tai)(tai)開關柜(ju)(ju)的(de)母線(xian)(xian)同時就(jiu)是(shi)環(huan)形干線(xian)(xian)的(de)一部(bu)分。就(jiu)是(shi)說，環(huan)形干線(xian)(xian)是(shi)由(you)每臺(tai)(tai)出線(xian)(xian)柜(ju)(ju)的(de)母線(xian)(xian)連(lian)接(jie)起來(lai)共同組成的(de)。每臺(tai)(tai)出線(xian)(xian)柜(ju)(ju)就(jiu)叫(jiao)“環(huan)網柜(ju)(ju)”。實(shi)際(ji)上(shang)單獨(du)拿出一臺(tai)(tai)環(huan)網柜(ju)(ju)是(shi)看不出“環(huan)網”的(de)含義的(de)。

這些環網柜的(de)額定(ding)電流都不大，因而(er)環網柜的(de)高壓開(kai)關(guan)一般(ban)(ban)不采用(yong)結構復雜的(de)斷路器(qi)而(er)采取結構簡(jian)單的(de)帶高壓熔(rong)斷器(qi)的(de)高壓負荷開(kai)關(guan)。也就是(shi)說(shuo)，環網柜中(zhong)的(de)高壓開(kai)關(guan)一般(ban)(ban)是(shi)負荷開(kai)關(guan)。環網柜用(yong)負荷開(kai)關(guan)操(cao)作正常(chang)電流，而(er)用(yong)熔(rong)斷器(qi)切除短路電流，這兩(liang)者結合起來取代了斷路器(qi)。當然(ran)這只(zhi)能(neng)局限在一定(ding)容量內。