高(gao)(gao)壓環網(wang)(wang)柜是為(wei)提高(gao)(gao)供(gong)電可靠性，使(shi)用(yong)戶可以從兩(liang)個方向獲得電源，通常(chang)將供(gong)電網(wang)(wang)連接成環形(xing)。這種供(gong)電方式簡稱為(wei)環網(wang)(wang)供(gong)電。在工(gong)礦企業、住(zhu)宅小(xiao)區、港口(kou)和(he)高(gao)(gao)層建筑(zhu)等交流10KV配(pei)電系統(tong)中，因負載(zai)容(rong)不大，其高(gao)(gao)壓回路通常(chang)采用(yong)負荷開(kai)關或真空接觸器(qi)控制，并配(pei)有高(gao)(gao)壓熔斷器(qi)保護(hu)。
該系統通常(chang)采用(yong)環形網(wang)供電(dian)(dian)(dian)(dian)，所(suo)使用(yong)高壓(ya)開關柜(ju)(ju)(ju)一般習慣上(shang)稱為環網(wang)柜(ju)(ju)(ju)。環網(wang)柜(ju)(ju)(ju)除了向本配(pei)電(dian)(dian)(dian)(dian)所(suo)供電(dian)(dian)(dian)(dian)外，其高壓(ya)母(mu)線(xian)還要(yao)通過(guo)環形供電(dian)(dian)(dian)(dian)網(wang)的(de)穿(chuan)越(yue)電(dian)(dian)(dian)(dian)流(liu)(liu)（即經本配(pei)電(dian)(dian)(dian)(dian)所(suo)母(mu)線(xian)向相鄰配(pei)電(dian)(dian)(dian)(dian)所(suo)供電(dian)(dian)(dian)(dian)的(de)電(dian)(dian)(dian)(dian)流(liu)(liu)），因此環網(wang)柜(ju)(ju)(ju)的(de)高壓(ya)母(mu)線(xian)截面要(yao)根據本配(pei)電(dian)(dian)(dian)(dian)所(suo)的(de)負荷(he)電(dian)(dian)(dian)(dian)流(liu)(liu)與(yu)環網(wang)穿(chuan)越(yue)電(dian)(dian)(dian)(dian)流(liu)(liu)之和選擇(ze)，以保證(zheng)運行中高壓(ya)母(mu)線(xian)不(bu)過(guo)負荷(he)運行。
|
