一、環網箱是什么

環網箱就(jiu)(jiu)是(shi)每個配電支路設一臺開關(guan)柜(ju)（出(chu)線(xian)(xian)(xian)(xian)開關(guan)柜(ju)），這臺開關(guan)柜(ju)的母線(xian)(xian)(xian)(xian)一同(tong)就(jiu)(jiu)是(shi)環(huan)形干線(xian)(xian)(xian)(xian)的一部分。就(jiu)(jiu)是(shi)說，環(huan)形干線(xian)(xian)(xian)(xian)是(shi)由每臺出(chu)線(xian)(xian)(xian)(xian)柜(ju)的母線(xian)(xian)(xian)(xian)連接(jie)起來共同(tong)組成的。每臺出(chu)線(xian)(xian)(xian)(xian)柜(ju)叫“環(huan)網箱(xiang)”，國外叫環(huan)網供電單(dan)元(yuan)。

二、環網箱的作用是什么

用于(yu)分(fen)合負荷電(dian)流，開斷短路(lu)電(dian)流及變壓器(qi)空(kong)載電(dian)流，必定距離架空(kong)線(xian)路(lu)、電(dian)纜線(xian)路(lu)的充電(dian)電(dian)流，起控制和(he)保護效果，是環(huan)網供電(dian)和(he)終端供電(dian)的重(zhong)要開關設備。

環網箱(xiang)除了(le)向本(ben)(ben)配電(dian)(dian)(dian)(dian)所(suo)(suo)供電(dian)(dian)(dian)(dian)外，其高(gao)壓母線(xian)還要(yao)經過環形供電(dian)(dian)(dian)(dian)網的(de)穿越電(dian)(dian)(dian)(dian)流（即(ji)經本(ben)(ben)配電(dian)(dian)(dian)(dian)所(suo)(suo)母線(xian)向相(xiang)鄰(lin)配電(dian)(dian)(dian)(dian)所(suo)(suo)供電(dian)(dian)(dian)(dian)的(de)電(dian)(dian)(dian)(dian)流），因而環網箱(xiang)的(de)高(gao)壓母線(xian)截面(mian)要(yao)根據本(ben)(ben)配電(dian)(dian)(dian)(dian)所(suo)(suo)的(de)負(fu)荷電(dian)(dian)(dian)(dian)流于環網穿越電(dian)(dian)(dian)(dian)流之(zhi)和選擇，以保證工(gong)(gong)作(zuo)中高(gao)壓母線(xian)不過負(fu)荷工(gong)(gong)作(zuo)。

三、環網箱和環網柜的區別

環網柜帶開關，可以實現配網自動化，體積比較大，適合環網供電，一般都是室內使用，也有室外使用的，廣泛使用供電可靠性比較高的地方，通常雙回路供電線路上最常用。環網箱通常不帶(dai)開關(guan)(guan)，主要是實(shi)現電纜的(de)(de)(de)分接和轉(zhuan)接，目前也有(you)帶(dai)開關(guan)(guan)的(de)(de)(de)環(huan)網箱(xiang)，有(you)的(de)(de)(de)地(di)方直接把帶(dai)開關(guan)(guan)的(de)(de)(de)環(huan)網箱(xiang)稱為戶外環(huan)網柜(ju)。