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
電中性點直接接地時(shi)電氣設備外露可導電部分通過零(ling)線接地的接零(ling)保護系統。
2、TN-C
工作零(ling)(ling)(ling)線(xian)與保(bao)(bao)護(hu)零(ling)(ling)(ling)線(xian)合(he)一設置的接零(ling)(ling)(ling)保(bao)(bao)護(hu)系統,工作零(ling)(ling)(ling)線(xian)有不平衡(heng)電流對地有電壓,不使用。
3、TN-C-S
工作零(ling)(ling)線與保護(hu)(hu)零(ling)(ling)線前(qian)一(yi)(yi)(yi)部(bu)分(fen)合一(yi)(yi)(yi),后一(yi)(yi)(yi)部(bu)分(fen)分(fen)開設(she)置的(de)接(jie)零(ling)(ling)保護(hu)(hu)系統。民用建筑用電設(she)計較多為這種,但是(shi)現在配電室一(yi)(yi)(yi)般(ban)用漏(lou)電保護(hu)(hu),所以也有比較多的(de)TN-S系統。
4、TN-S
工作零線(xian)與保護零線(xian)分開(kai)設置的接零保護系統;適用(yong)于工業與民用(yong)等(deng)低壓供電系統,對PE線(xian)就是地線(xian)有安全規定。
5、TT
電(dian)源中性(xing)點(dian)直接接地(di),電(dian)氣設(she)備外露可導電(dian)部分直接接地(di)的(de)接地(di)保(bao)護(hu)系統,其(qi)中電(dian)氣設(she)備的(de)接地(di)點(dian)獨立于電(dian)源中性(xing)點(dian)接地(di)點(dian)。投(tou)入(ru)鋼材較多,很難(nan)回收,且存(cun)在不安全因素,現在已經不使(shi)用。
二、供電系統由哪幾部分組成
電(dian)(dian)(dian)(dian)(dian)、輸電(dian)(dian)(dian)(dian)(dian)、變(bian)電(dian)(dian)(dian)(dian)(dian)、配(pei)電(dian)(dian)(dian)(dian)(dian)、用(yong)電(dian)(dian)(dian)(dian)(dian)設備及(ji)(ji)相(xiang)應的(de)(de)輔助系(xi)(xi)(xi)統(tong)組(zu)(zu)成的(de)(de)電(dian)(dian)(dian)(dian)(dian)能(neng)生產、輸送、分配(pei)、使用(yong)的(de)(de)統(tong)一整體(ti)(ti)稱(cheng)為(wei)供電(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)。由(you)輸電(dian)(dian)(dian)(dian)(dian)、變(bian)電(dian)(dian)(dian)(dian)(dian)、配(pei)電(dian)(dian)(dian)(dian)(dian)設備及(ji)(ji)相(xiang)應的(de)(de)輔助系(xi)(xi)(xi)統(tong)組(zu)(zu)成的(de)(de)聯(lian)系(xi)(xi)(xi)發電(dian)(dian)(dian)(dian)(dian)與用(yong)電(dian)(dian)(dian)(dian)(dian)的(de)(de)統(tong)一整體(ti)(ti)稱(cheng)為(wei)電(dian)(dian)(dian)(dian)(dian)力網。也可描述(shu)為(wei)供電(dian)(dian)(dian)(dian)(dian)系(xi)(xi)(xi)統(tong)是由(you)電(dian)(dian)(dian)(dian)(dian)源、電(dian)(dian)(dian)(dian)(dian)力網以及(ji)(ji)用(yong)戶組(zu)(zu)成的(de)(de)整體(ti)(ti)。
供電(dian)系(xi)統在保證電(dian)能(neng)質量、實現安全可靠供電(dian)的前提下,還應實現經濟運行(xing),即努力調(diao)整負(fu)荷曲(qu)線,提高設備利(li)用(yong)率,合理利(li)用(yong)各種動力資源,降低燃料消耗、廠用(yong)電(dian)和電(dian)力網絡的損耗,以取得最佳(jia)經濟效益。