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

電中性點直接(jie)接(jie)地(di)時(shi)電氣設備外(wai)露可導(dao)電部(bu)分通過(guo)零(ling)線接(jie)地(di)的接(jie)零(ling)保(bao)護系統。

2、TN-C

工作零線與保(bao)護零線合一設(she)置的接零保(bao)護系統(tong)，工作零線有不平(ping)衡電流對(dui)地(di)有電壓(ya)，不使用。

3、TN-C-S

工作零(ling)線(xian)與保(bao)(bao)護零(ling)線(xian)前一(yi)部(bu)分合一(yi)，后一(yi)部(bu)分分開設(she)置的接零(ling)保(bao)(bao)護系統。民用(yong)(yong)(yong)建筑用(yong)(yong)(yong)電設(she)計較(jiao)多(duo)為這種，但是現在配電室一(yi)般用(yong)(yong)(yong)漏(lou)電保(bao)(bao)護，所以(yi)也有比較(jiao)多(duo)的TN-S系統。

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4、TN-S

工作零(ling)線與(yu)保護零(ling)線分開設(she)置(zhi)的接零(ling)保護系(xi)(xi)統；適用于工業與(yu)民(min)用等(deng)低壓(ya)供電系(xi)(xi)統，對PE線就(jiu)是地線有(you)安全規定。

5、TT

電(dian)源(yuan)中(zhong)性(xing)點直(zhi)接(jie)(jie)(jie)接(jie)(jie)(jie)地(di)(di)(di)，電(dian)氣設備外露可(ke)導電(dian)部(bu)分直(zhi)接(jie)(jie)(jie)接(jie)(jie)(jie)地(di)(di)(di)的(de)接(jie)(jie)(jie)地(di)(di)(di)保護(hu)系統，其中(zhong)電(dian)氣設備的(de)接(jie)(jie)(jie)地(di)(di)(di)點獨立(li)于電(dian)源(yuan)中(zhong)性(xing)點接(jie)(jie)(jie)地(di)(di)(di)點。投入鋼材較多(duo)，很難回(hui)收，且存在不安全因素(su)，現在已經(jing)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)、配電(dian)(dian)(dian)、用電(dian)(dian)(dian)設(she)備及(ji)相(xiang)應的(de)(de)(de)(de)(de)輔助系(xi)統(tong)組成的(de)(de)(de)(de)(de)電(dian)(dian)(dian)能生(sheng)產、輸送、分(fen)配、使用的(de)(de)(de)(de)(de)統(tong)一整(zheng)(zheng)體稱為(wei)供電(dian)(dian)(dian)系(xi)統(tong)。由輸電(dian)(dian)(dian)、變電(dian)(dian)(dian)、配電(dian)(dian)(dian)設(she)備及(ji)相(xiang)應的(de)(de)(de)(de)(de)輔助系(xi)統(tong)組成的(de)(de)(de)(de)(de)聯(lian)系(xi)發電(dian)(dian)(dian)與用電(dian)(dian)(dian)的(de)(de)(de)(de)(de)統(tong)一整(zheng)(zheng)體稱為(wei)電(dian)(dian)(dian)力(li)(li)網(wang)。也可描述為(wei)供電(dian)(dian)(dian)系(xi)統(tong)是由電(dian)(dian)(dian)源、電(dian)(dian)(dian)力(li)(li)網(wang)以(yi)及(ji)用戶(hu)組成的(de)(de)(de)(de)(de)整(zheng)(zheng)體。

供(gong)電(dian)系統在(zai)保證(zheng)電(dian)能質量、實(shi)現安全可靠供(gong)電(dian)的前提(ti)下，還(huan)應實(shi)現經濟運行(xing)，即努力(li)(li)調整負(fu)荷曲線，提(ti)高(gao)設(she)備利(li)(li)用(yong)(yong)率，合理利(li)(li)用(yong)(yong)各(ge)種動(dong)力(li)(li)資源，降低燃(ran)料消耗、廠(chang)用(yong)(yong)電(dian)和電(dian)力(li)(li)網絡的損耗，以取得最佳經濟效益。