在城市軌道交通通信(xin)中(zhong)其48v通信(xin)電(dian)源起到的作用(yong)是十分重要(yao)的，他(ta)的功能就是保(bao)證其穩定(ding)(ding)、可靠(kao)和安(an)全。穩定(ding)(ding)要(yao)求其供(gong)電(dian)的電(dian)壓和頻率的波(bo)動都(dou)必須在其允許的范(fan)圍之內。可靠(kao)電(dian)源是指(zhi)能保(bao)證晝夜不間斷供(gong)電(dian)的獨立電(dian)源。安(an)全是指(zhi)電(dian)源設備要(yao)采取保(bao)障安(an)全的措施。 

       首先(xian)我們(men)要(yao)保證城市(shi)軌道(dao)交(jiao)通(tong)48v通(tong)信(xin)(xin)電(dian)(dian)(dian)(dian)源(yuan)系統必須是獨(du)立的供電(dian)(dian)(dian)(dian)系統，必須要(yao)滿(man)足(zu)第一類電(dian)(dian)(dian)(dian)源(yuan)要(yao)求(qiu)，取得兩路(lu)可靠獨(du)立的電(dian)(dian)(dian)(dian)源(yuan)，其中一路(lu)為(wei)專盤(pan)專線。當然還要(yao)城市(shi)軌道(dao)交(jiao)通(tong)通(tong)信(xin)(xin)電(dian)(dian)(dian)(dian)源(yuan)設備應滿(man)足(zu)通(tong)信(xin)(xin)設備對(dui)電(dian)(dian)(dian)(dian)源(yuan)可靠性(xing)的要(yao)求(qiu)。滿(man)足(zu)其不(bu)間斷供電(dian)(dian)(dian)(dian)的需求(qiu)。最后對(dui)要(yao)求(qiu)直(zhi)(zhi)流(liu)供電(dian)(dian)(dian)(dian)的通(tong)信(xin)(xin)設備，應采用(yong)集(ji)中方式供電(dian)(dian)(dian)(dian)。直(zhi)(zhi)流(liu)48v通(tong)信(xin)(xin)電(dian)(dian)(dian)(dian)源(yuan)系統可由直(zhi)(zhi)流(liu)配電(dian)(dian)(dian)(dian)盤(pan)、整流(liu)模塊(kuai)、直(zhi)(zhi)流(liu)變(bian)換器(qi)、逆(ni)變(bian)器(qi)、閥(fa)控式密閉鉛蓄電(dian)(dian)(dian)(dian)池組(zu)(zu)組(zu)(zu)合機架組(zu)(zu)成，并應具有遙信(xin)(xin)、遙測(ce)、遙控性(xing)能和標(biao)準的接(jie)口及通(tong)信(xin)(xin)協議。