高压环网柜是为进(jin)步供电(dian)可靠(kao)性，运用(yong)(yong)户(hu)能够从两个(ge)方向取(qu)得电(dian)源，一般(ban)将供电(dian)网(wang)连接(jie)成环(huan)形。这种(zhong)供电(dian)方法简称为环(huan)网(wang)供电(dian)。在港口(kou)和高层建筑(zhu)等(deng)沟通10KV配电(dian)体(ti)系中，因负载容不大，其高压回路一般(ban)选用(yong)(yong)负荷开关或真空接(jie)触器操控，并配有高压熔(rong)断(duan)器维护。

高(gao)(gao)压环(huan)(huan)网(wang)(wang)柜(ju)是(shi)为进步(bu)供(gong)(gong)电(dian)(dian)(dian)(dian)可靠(kao)性，运用(yong)(yong)户能够(gou)从两个(ge)方(fang)向取得(de)电(dian)(dian)(dian)(dian)源，一(yi)般(ban)将供(gong)(gong)电(dian)(dian)(dian)(dian)网(wang)(wang)连接成环(huan)(huan)形(xing)。这(zhei)种供(gong)(gong)电(dian)(dian)(dian)(dian)方(fang)法简称为环(huan)(huan)网(wang)(wang)供(gong)(gong)电(dian)(dian)(dian)(dian)。在港口和(he)高(gao)(gao)层建筑等沟通10KV配(pei)电(dian)(dian)(dian)(dian)体系中，因负载容不大，其高(gao)(gao)压回(hui)路一(yi)般(ban)选用(yong)(yong)负荷开关(guan)或真空(kong)接触器操(cao)控(kong)，并配(pei)有(you)高(gao)(gao)压熔断器维护(hu)。该体系一(yi)般(ban)选用(yong)(yong)环(huan)(huan)形(xing)网(wang)(wang)供(gong)(gong)电(dian)(dian)(dian)(dian)，所运用(yong)(yong)高(gao)(gao)压开关(guan)柜(ju)一(yi)般(ban)习惯上称为环(huan)(huan)网(wang)(wang)柜(ju)。环(huan)(huan)网(wang)(wang)柜(ju)除了向本配(pei)电(dian)(dian)(dian)(dian)所供(gong)(gong)电(dian)(dian)(dian)(dian)外(wai)，其高(gao)(gao)压母(mu)线(xian)还要(yao)经(jing)过环(huan)(huan)形(xing)供(gong)(gong)电(dian)(dian)(dian)(dian)网(wang)(wang)的(de)穿越(yue)电(dian)(dian)(dian)(dian)流(liu)（即经(jing)本配(pei)电(dian)(dian)(dian)(dian)所母(mu)线(xian)向相邻配(pei)电(dian)(dian)(dian)(dian)所供(gong)(gong)电(dian)(dian)(dian)(dian)的(de)电(dian)(dian)(dian)(dian)流(liu)），因而环(huan)(huan)网(wang)(wang)柜(ju)的(de)高(gao)(gao)压母(mu)线(xian)截面要(yao)根据本配(pei)电(dian)(dian)(dian)(dian)所的(de)负荷电(dian)(dian)(dian)(dian)流(liu)与环(huan)(huan)网(wang)(wang)穿越(yue)电(dian)(dian)(dian)(dian)流(liu)之和(he)挑(tiao)选。

环网柜一般分为空气绝缘、固体绝缘和SF6绝缘三种，用于分合负荷电流，开断短路电流及变压器空(kong)(kong)载(zai)电流(liu)(liu)，一(yi)定(ding)距离(li)(li)架空(kong)(kong)线(xian)路(lu)(lu)、电缆(lan)线(xian)路(lu)(lu)的(de)(de)充电电流(liu)(liu)，起控(kong)制和(he)保护作用，是(shi)环(huan)网(wang)供(gong)(gong)电和(he)终(zhong)端(duan)供(gong)(gong)电的(de)(de)重要(yao)开(kai)关(guan)(guan)设备。柜(ju)体中，配空(kong)(kong)气(qi)(qi)绝缘的(de)(de)负(fu)荷(he)(he)开(kai)关(guan)(guan)主要(yao)有产气(qi)(qi)式(shi)(shi)(shi)(shi)、压气(qi)(qi)式(shi)(shi)(shi)(shi)、真(zhen)空(kong)(kong)式(shi)(shi)(shi)(shi)，配SF6绝缘的(de)(de)负(fu)荷(he)(he)开(kai)关(guan)(guan)为SF6式(shi)(shi)(shi)(shi)，由于SF6气(qi)(qi)体封闭在(zai)壳(qiao)体内，它形成的(de)(de)隔(ge)(ge)断(duan)断(duan)口不可见。环(huan)网(wang)柜(ju)中的(de)(de)负(fu)荷(he)(he)开(kai)关(guan)(guan)，一(yi)般要(yao)求三工(gong)(gong)位(wei)，即切(qie)断(duan)负(fu)荷(he)(he)，隔(ge)(ge)离(li)(li)电路(lu)(lu)、可行靠(kao)接地。产气(qi)(qi)式(shi)(shi)(shi)(shi)、压气(qi)(qi)式(shi)(shi)(shi)(shi)和(he)SF6式(shi)(shi)(shi)(shi)负(fu)荷(he)(he)开(kai)关(guan)(guan)易实现三工(gong)(gong)位(wei)，而真(zhen)空(kong)(kong)灭弧式(shi)(shi)(shi)(shi)只能(neng)开(kai)断(duan)，不能(neng)隔(ge)(ge)离(li)(li)，所以(yi)一(yi)般真(zhen)空(kong)(kong)负(fu)荷(he)(he)环(huan)网(wang)开(kai)关(guan)(guan)柜(ju)在(zai)负(fu)荷(he)(he)开(kai)关(guan)(guan)前再加上(shang)一(yi)个隔(ge)(ge)离(li)(li)开(kai)关(guan)(guan)，以(yi)形成隔(ge)(ge)离(li)(li)断(duan)口。