在(zai)城市軌道交通通信(xin)中(zhong)其48v通信(xin)電(dian)(dian)源起到的(de)作用是(shi)十分重要的(de)，他(ta)的(de)功能就是(shi)保證(zheng)其穩定、可靠和安(an)(an)全。穩定要求其供電(dian)(dian)的(de)電(dian)(dian)壓和頻率(lv)的(de)波動都必須在(zai)其允許的(de)范圍之內(nei)。可靠電(dian)(dian)源是(shi)指能保證(zheng)晝(zhou)夜不間斷供電(dian)(dian)的(de)獨(du)立電(dian)(dian)源。安(an)(an)全是(shi)指電(dian)(dian)源設備要采取保障安(an)(an)全的(de)措施。 

       首先我(wo)們要保(bao)證城市軌(gui)(gui)道(dao)(dao)交通(tong)48v通(tong)信電(dian)源(yuan)(yuan)系(xi)統必須(xu)是獨(du)立(li)的(de)(de)供(gong)(gong)電(dian)系(xi)統，必須(xu)要滿(man)足第一類電(dian)源(yuan)(yuan)要求(qiu)，取(qu)得兩路可(ke)靠獨(du)立(li)的(de)(de)電(dian)源(yuan)(yuan)，其(qi)(qi)中(zhong)一路為(wei)專(zhuan)盤專(zhuan)線(xian)。當然還要城市軌(gui)(gui)道(dao)(dao)交通(tong)通(tong)信電(dian)源(yuan)(yuan)設備(bei)應(ying)滿(man)足通(tong)信設備(bei)對電(dian)源(yuan)(yuan)可(ke)靠性的(de)(de)要求(qiu)。滿(man)足其(qi)(qi)不間斷(duan)供(gong)(gong)電(dian)的(de)(de)需求(qiu)。最后對要求(qiu)直流(liu)供(gong)(gong)電(dian)的(de)(de)通(tong)信設備(bei)，應(ying)采用集(ji)中(zhong)方式供(gong)(gong)電(dian)。直流(liu)48v通(tong)信電(dian)源(yuan)(yuan)系(xi)統可(ke)由(you)直流(liu)配電(dian)盤、整(zheng)流(liu)模塊(kuai)、直流(liu)變換器、逆變器、閥控式密閉(bi)鉛蓄電(dian)池組(zu)組(zu)合機架(jia)組(zu)成，并應(ying)具有遙(yao)(yao)(yao)信、遙(yao)(yao)(yao)測、遙(yao)(yao)(yao)控性能和標準(zhun)的(de)(de)接口及通(tong)信協(xie)議。