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)性點(dian)直接(jie)接(jie)地時電氣設備外露可(ke)導(dao)電部分通過零線接(jie)地的接(jie)零保護系統。
2、TN-C
工(gong)作(zuo)零(ling)線(xian)與保(bao)護(hu)零(ling)線(xian)合一設置的接(jie)零(ling)保(bao)護(hu)系(xi)統(tong),工(gong)作(zuo)零(ling)線(xian)有不平衡電流對地有電壓,不使用。
3、TN-C-S
工作零線與保(bao)(bao)護零線前一(yi)部(bu)分(fen)合一(yi),后一(yi)部(bu)分(fen)分(fen)開設置(zhi)的(de)接零保(bao)(bao)護系統(tong)。民(min)用建筑用電設計較多(duo)為這種,但是(shi)現在配電室(shi)一(yi)般用漏電保(bao)(bao)護,所以也有比(bi)較多(duo)的(de)TN-S系統(tong)。
4、TN-S
工作(zuo)零(ling)(ling)線(xian)(xian)與保護零(ling)(ling)線(xian)(xian)分(fen)開設置的接零(ling)(ling)保護系統;適用(yong)于工業(ye)與民用(yong)等低壓供電系統,對(dui)PE線(xian)(xian)就(jiu)是地線(xian)(xian)有安全(quan)規(gui)定。
5、TT
電(dian)源中(zhong)性(xing)點(dian)直(zhi)接(jie)接(jie)地(di)(di),電(dian)氣(qi)設(she)(she)備外(wai)露可導電(dian)部分直(zhi)接(jie)接(jie)地(di)(di)的接(jie)地(di)(di)保(bao)護系統,其(qi)中(zhong)電(dian)氣(qi)設(she)(she)備的接(jie)地(di)(di)點(dian)獨(du)立于電(dian)源中(zhong)性(xing)點(dian)接(jie)地(di)(di)點(dian)。投入鋼材較多,很難回收(shou),且存在不安全因素,現在已(yi)經不使(shi)用。
二、供電系統由哪幾部分組成
電(dian)(dian)(dian)(dian)、輸(shu)(shu)電(dian)(dian)(dian)(dian)、變(bian)電(dian)(dian)(dian)(dian)、配(pei)(pei)電(dian)(dian)(dian)(dian)、用(yong)電(dian)(dian)(dian)(dian)設備及相應的(de)(de)輔(fu)助(zhu)系(xi)(xi)統組(zu)成(cheng)的(de)(de)電(dian)(dian)(dian)(dian)能(neng)生產、輸(shu)(shu)送、分配(pei)(pei)、使用(yong)的(de)(de)統一(yi)整(zheng)體稱(cheng)(cheng)為(wei)供電(dian)(dian)(dian)(dian)系(xi)(xi)統。由輸(shu)(shu)電(dian)(dian)(dian)(dian)、變(bian)電(dian)(dian)(dian)(dian)、配(pei)(pei)電(dian)(dian)(dian)(dian)設備及相應的(de)(de)輔(fu)助(zhu)系(xi)(xi)統組(zu)成(cheng)的(de)(de)聯(lian)系(xi)(xi)發電(dian)(dian)(dian)(dian)與(yu)用(yong)電(dian)(dian)(dian)(dian)的(de)(de)統一(yi)整(zheng)體稱(cheng)(cheng)為(wei)電(dian)(dian)(dian)(dian)力(li)網。也(ye)可(ke)描(miao)述為(wei)供電(dian)(dian)(dian)(dian)系(xi)(xi)統是由電(dian)(dian)(dian)(dian)源、電(dian)(dian)(dian)(dian)力(li)網以及用(yong)戶(hu)組(zu)成(cheng)的(de)(de)整(zheng)體。
供電(dian)(dian)系(xi)統在(zai)保證(zheng)電(dian)(dian)能質量、實現安(an)全可靠供電(dian)(dian)的前提(ti)(ti)下,還應(ying)實現經濟運行(xing),即努力調整負(fu)荷曲線,提(ti)(ti)高設備利用率(lv),合理利用各種動力資源,降低燃料消耗、廠用電(dian)(dian)和電(dian)(dian)力網絡的損耗,以取(qu)得最(zui)佳經濟效益。