在城市軌道交通(tong)通(tong)信(xin)中其48v通(tong)信(xin)電(dian)(dian)(dian)(dian)源(yuan)(yuan)起到的(de)(de)(de)(de)作用是十分重要的(de)(de)(de)(de)，他的(de)(de)(de)(de)功能就是保(bao)證(zheng)其穩定(ding)、可靠(kao)(kao)和安(an)全(quan)。穩定(ding)要求其供電(dian)(dian)(dian)(dian)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)壓和頻率的(de)(de)(de)(de)波動都必須在其允(yun)許(xu)的(de)(de)(de)(de)范圍(wei)之內。可靠(kao)(kao)電(dian)(dian)(dian)(dian)源(yuan)(yuan)是指(zhi)能保(bao)證(zheng)晝夜不(bu)間(jian)斷供電(dian)(dian)(dian)(dian)的(de)(de)(de)(de)獨立電(dian)(dian)(dian)(dian)源(yuan)(yuan)。安(an)全(quan)是指(zhi)電(dian)(dian)(dian)(dian)源(yuan)(yuan)設(she)備要采取保(bao)障安(an)全(quan)的(de)(de)(de)(de)措施。 

       首(shou)先我(wo)們要(yao)保證城市軌道交(jiao)通(tong)48v通(tong)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)系統必(bi)須(xu)是獨立(li)的供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)系統，必(bi)須(xu)要(yao)滿足第(di)一(yi)類電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)要(yao)求，取(qu)得兩路可(ke)靠獨立(li)的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)，其中(zhong)一(yi)路為專盤專線。當(dang)然(ran)還(huan)要(yao)城市軌道交(jiao)通(tong)通(tong)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)設(she)備應滿足通(tong)信(xin)設(she)備對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)可(ke)靠性(xing)的要(yao)求。滿足其不間斷供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的需求。最后對(dui)要(yao)求直(zhi)(zhi)流(liu)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)的通(tong)信(xin)設(she)備，應采用集中(zhong)方式供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。直(zhi)(zhi)流(liu)48v通(tong)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)系統可(ke)由直(zhi)(zhi)流(liu)配電(dian)(dian)(dian)(dian)(dian)(dian)(dian)盤、整流(liu)模塊、直(zhi)(zhi)流(liu)變換器(qi)、逆變器(qi)、閥控式密閉鉛蓄電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池組(zu)(zu)組(zu)(zu)合機架組(zu)(zu)成(cheng)，并應具有遙信(xin)、遙測、遙控性(xing)能和標準的接口及通(tong)信(xin)協議(yi)。