一、供電系統分為哪幾種
供電系統就是由電源系統和輸配電系統組成的產生電能并供應和輸送給用電設備的系統,供電系統可分為以下幾種:
1、TN
電中(zhong)性(xing)點(dian)直接接地(di)(di)時電氣設(she)備外(wai)露可導電部分通過(guo)零(ling)線接地(di)(di)的接零(ling)保護系統。
2、TN-C
工作零線與保護零線合一設置的接零保護系統(tong),工作零線有不平衡電(dian)流(liu)對地有電(dian)壓,不使用(yong)。
3、TN-C-S
工作零線(xian)與保護零線(xian)前一部(bu)分(fen)(fen)合一,后一部(bu)分(fen)(fen)分(fen)(fen)開(kai)設(she)置(zhi)的接零保護系統。民用建筑用電(dian)設(she)計較多為這(zhe)種,但(dan)是現在(zai)配(pei)電(dian)室一般用漏電(dian)保護,所以也有(you)比較多的TN-S系統。
4、TN-S
工(gong)作零線(xian)與(yu)保(bao)護(hu)零線(xian)分開設置的接零保(bao)護(hu)系(xi)統(tong);適用于工(gong)業與(yu)民用等低壓供電系(xi)統(tong),對PE線(xian)就是地線(xian)有安(an)全規定。
5、TT
電(dian)(dian)源中性點直接接地(di),電(dian)(dian)氣(qi)設(she)備(bei)外露可導電(dian)(dian)部分直接接地(di)的接地(di)保護系統,其(qi)中電(dian)(dian)氣(qi)設(she)備(bei)的接地(di)點獨立于電(dian)(dian)源中性點接地(di)點。投入鋼材較多,很難回收(shou),且存在不(bu)安(an)全因素,現在已經不(bu)使用。
二、供電系統由哪幾部分組成
電(dian)(dian)(dian)、輸(shu)電(dian)(dian)(dian)、變電(dian)(dian)(dian)、配電(dian)(dian)(dian)、用電(dian)(dian)(dian)設備及相(xiang)應的(de)(de)輔(fu)助(zhu)系統(tong)組(zu)成的(de)(de)電(dian)(dian)(dian)能生產、輸(shu)送、分(fen)配、使(shi)用的(de)(de)統(tong)一整體稱(cheng)為供電(dian)(dian)(dian)系統(tong)。由輸(shu)電(dian)(dian)(dian)、變電(dian)(dian)(dian)、配電(dian)(dian)(dian)設備及相(xiang)應的(de)(de)輔(fu)助(zhu)系統(tong)組(zu)成的(de)(de)聯系發(fa)電(dian)(dian)(dian)與用電(dian)(dian)(dian)的(de)(de)統(tong)一整體稱(cheng)為電(dian)(dian)(dian)力網(wang)。也可描述為供電(dian)(dian)(dian)系統(tong)是(shi)由電(dian)(dian)(dian)源、電(dian)(dian)(dian)力網(wang)以及用戶組(zu)成的(de)(de)整體。
供電(dian)系(xi)統(tong)在保證電(dian)能質(zhi)量、實現安全可(ke)靠供電(dian)的(de)(de)前提下,還應實現經(jing)(jing)濟運行,即努力調整負荷曲線,提高設(she)備(bei)利(li)用率,合理利(li)用各種動力資源(yuan),降低燃料消(xiao)耗(hao)(hao)、廠用電(dian)和(he)電(dian)力網絡的(de)(de)損(sun)耗(hao)(hao),以(yi)取得最佳經(jing)(jing)濟效益。