在城市軌道交通(tong)(tong)通(tong)(tong)信中其48v通(tong)(tong)信電(dian)源(yuan)起到的(de)作用是十分重要(yao)的(de)，他(ta)的(de)功能就(jiu)是保證(zheng)其穩(wen)定(ding)、可(ke)靠和(he)安(an)全。穩(wen)定(ding)要(yao)求其供電(dian)的(de)電(dian)壓和(he)頻率的(de)波動都必須在其允許的(de)范圍之內。可(ke)靠電(dian)源(yuan)是指能保證(zheng)晝夜不間斷(duan)供電(dian)的(de)獨(du)立電(dian)源(yuan)。安(an)全是指電(dian)源(yuan)設備要(yao)采取(qu)保障安(an)全的(de)措(cuo)施。 

       首先我們要(yao)(yao)保證(zheng)城市軌道交(jiao)通(tong)(tong)48v通(tong)(tong)信電(dian)(dian)(dian)源(yuan)(yuan)系統(tong)必須是獨立的(de)(de)供(gong)電(dian)(dian)(dian)系統(tong)，必須要(yao)(yao)滿足(zu)第一類電(dian)(dian)(dian)源(yuan)(yuan)要(yao)(yao)求(qiu)(qiu)，取(qu)得兩路可靠獨立的(de)(de)電(dian)(dian)(dian)源(yuan)(yuan)，其中一路為專盤專線(xian)。當然還要(yao)(yao)城市軌道交(jiao)通(tong)(tong)通(tong)(tong)信電(dian)(dian)(dian)源(yuan)(yuan)設(she)備(bei)(bei)應(ying)滿足(zu)通(tong)(tong)信設(she)備(bei)(bei)對(dui)電(dian)(dian)(dian)源(yuan)(yuan)可靠性的(de)(de)要(yao)(yao)求(qiu)(qiu)。滿足(zu)其不間斷供(gong)電(dian)(dian)(dian)的(de)(de)需求(qiu)(qiu)。最后對(dui)要(yao)(yao)求(qiu)(qiu)直(zhi)流(liu)供(gong)電(dian)(dian)(dian)的(de)(de)通(tong)(tong)信設(she)備(bei)(bei)，應(ying)采用集中方(fang)式供(gong)電(dian)(dian)(dian)。直(zhi)流(liu)48v通(tong)(tong)信電(dian)(dian)(dian)源(yuan)(yuan)系統(tong)可由直(zhi)流(liu)配電(dian)(dian)(dian)盤、整流(liu)模塊(kuai)、直(zhi)流(liu)變換器(qi)、逆變器(qi)、閥控式密閉鉛蓄電(dian)(dian)(dian)池組(zu)組(zu)合機架組(zu)成，并應(ying)具有遙信、遙測、遙控性能和標準的(de)(de)接口及通(tong)(tong)信協議(yi)。