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(dian)中性點直(zhi)接接地(di)時電(dian)氣(qi)設備(bei)外露可導(dao)電(dian)部分(fen)通過零(ling)線接地(di)的(de)接零(ling)保護系統(tong)。

2、TN-C

工(gong)作(zuo)零(ling)線(xian)與保護零(ling)線(xian)合一設置(zhi)的(de)接(jie)零(ling)保護系統，工(gong)作(zuo)零(ling)線(xian)有不平衡電流對地有電壓(ya)，不使用。

3、TN-C-S

工作零(ling)線與保(bao)(bao)護零(ling)線前一部分合一，后一部分分開(kai)設置的(de)接零(ling)保(bao)(bao)護系統。民(min)用(yong)建筑用(yong)電(dian)設計較多(duo)為這種，但是現在配電(dian)室一般用(yong)漏電(dian)保(bao)(bao)護，所以(yi)也有(you)比較多(duo)的(de)TN-S系統。

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4、TN-S

工作零線與保護零線分開設置(zhi)的接零保護系(xi)統(tong)；適用于工業與民用等低(di)壓供電系(xi)統(tong)，對PE線就是地線有安全規定。

5、TT

電(dian)(dian)源中性點直(zhi)接接地(di)，電(dian)(dian)氣設備外露(lu)可導電(dian)(dian)部分直(zhi)接接地(di)的接地(di)保護系統，其中電(dian)(dian)氣設備的接地(di)點獨立(li)于電(dian)(dian)源中性點接地(di)點。投入鋼材(cai)較(jiao)多，很難(nan)回收，且存(cun)在不安全因(yin)素，現在已經不使用。

二、供電系統由哪幾部分組成

電(dian)(dian)(dian)、輸電(dian)(dian)(dian)、變電(dian)(dian)(dian)、配(pei)電(dian)(dian)(dian)、用電(dian)(dian)(dian)設(she)備及(ji)相應的輔助系(xi)統(tong)(tong)組(zu)(zu)成的電(dian)(dian)(dian)能生產、輸送、分(fen)配(pei)、使用的統(tong)(tong)一整(zheng)體(ti)稱為供(gong)(gong)電(dian)(dian)(dian)系(xi)統(tong)(tong)。由輸電(dian)(dian)(dian)、變電(dian)(dian)(dian)、配(pei)電(dian)(dian)(dian)設(she)備及(ji)相應的輔助系(xi)統(tong)(tong)組(zu)(zu)成的聯系(xi)發電(dian)(dian)(dian)與用電(dian)(dian)(dian)的統(tong)(tong)一整(zheng)體(ti)稱為電(dian)(dian)(dian)力網。也(ye)可描述為供(gong)(gong)電(dian)(dian)(dian)系(xi)統(tong)(tong)是由電(dian)(dian)(dian)源(yuan)、電(dian)(dian)(dian)力網以及(ji)用戶(hu)組(zu)(zu)成的整(zheng)體(ti)。

供(gong)電系統在保(bao)證(zheng)電能質量(liang)、實現(xian)安全可(ke)靠(kao)供(gong)電的(de)前(qian)提(ti)下，還(huan)應實現(xian)經濟運行，即努力調整負荷曲線，提(ti)高設備利用率，合理利用各種動力資源，降低燃(ran)料(liao)消耗、廠用電和電力網絡的(de)損(sun)耗，以取(qu)得最(zui)佳經濟效益。