在(zai)城市軌道交通(tong)(tong)通(tong)(tong)信中(zhong)其48v通(tong)(tong)信電源(yuan)起(qi)到(dao)的(de)作用是十分(fen)重要的(de)，他的(de)功能就是保證其穩定、可靠和(he)安全。穩定要求其供電的(de)電壓和(he)頻(pin)率的(de)波動都必須在(zai)其允許的(de)范圍之內。可靠電源(yuan)是指能保證晝夜(ye)不間斷供電的(de)獨立(li)電源(yuan)。安全是指電源(yuan)設備(bei)要采(cai)取(qu)保障(zhang)安全的(de)措施。 

       首先我(wo)們要(yao)保證城市(shi)軌道(dao)交通(tong)(tong)48v通(tong)(tong)信(xin)電(dian)(dian)源(yuan)系(xi)統(tong)必(bi)須(xu)是獨立(li)的(de)(de)供(gong)電(dian)(dian)系(xi)統(tong)，必(bi)須(xu)要(yao)滿(man)足(zu)第一類電(dian)(dian)源(yuan)要(yao)求(qiu)，取得兩路可靠獨立(li)的(de)(de)電(dian)(dian)源(yuan)，其中(zhong)一路為專盤(pan)專線。當然還(huan)要(yao)城市(shi)軌道(dao)交通(tong)(tong)通(tong)(tong)信(xin)電(dian)(dian)源(yuan)設備(bei)應(ying)(ying)滿(man)足(zu)通(tong)(tong)信(xin)設備(bei)對(dui)電(dian)(dian)源(yuan)可靠性(xing)的(de)(de)要(yao)求(qiu)。滿(man)足(zu)其不間斷供(gong)電(dian)(dian)的(de)(de)需(xu)求(qiu)。最后對(dui)要(yao)求(qiu)直(zhi)(zhi)流(liu)(liu)供(gong)電(dian)(dian)的(de)(de)通(tong)(tong)信(xin)設備(bei)，應(ying)(ying)采用集中(zhong)方式(shi)供(gong)電(dian)(dian)。直(zhi)(zhi)流(liu)(liu)48v通(tong)(tong)信(xin)電(dian)(dian)源(yuan)系(xi)統(tong)可由直(zhi)(zhi)流(liu)(liu)配(pei)電(dian)(dian)盤(pan)、整(zheng)流(liu)(liu)模塊(kuai)、直(zhi)(zhi)流(liu)(liu)變(bian)換(huan)器、逆變(bian)器、閥控(kong)式(shi)密閉(bi)鉛蓄電(dian)(dian)池組(zu)(zu)組(zu)(zu)合機(ji)架組(zu)(zu)成，并應(ying)(ying)具有遙(yao)信(xin)、遙(yao)測、遙(yao)控(kong)性(xing)能和標(biao)準的(de)(de)接(jie)口及通(tong)(tong)信(xin)協(xie)議(yi)。