在城市軌道交通(tong)(tong)通(tong)(tong)信中(zhong)其(qi)48v通(tong)(tong)信電(dian)(dian)(dian)源(yuan)起到(dao)的(de)(de)作用(yong)是(shi)十分重要(yao)的(de)(de)，他的(de)(de)功能就是(shi)保(bao)證(zheng)其(qi)穩(wen)定(ding)、可靠和安全。穩(wen)定(ding)要(yao)求(qiu)其(qi)供電(dian)(dian)(dian)的(de)(de)電(dian)(dian)(dian)壓和頻率的(de)(de)波動都必須(xu)在其(qi)允許的(de)(de)范圍之內。可靠電(dian)(dian)(dian)源(yuan)是(shi)指能保(bao)證(zheng)晝(zhou)夜不間(jian)斷供電(dian)(dian)(dian)的(de)(de)獨立電(dian)(dian)(dian)源(yuan)。安全是(shi)指電(dian)(dian)(dian)源(yuan)設備(bei)要(yao)采(cai)取保(bao)障(zhang)安全的(de)(de)措施。 

       首(shou)先我們要(yao)(yao)保證城市軌(gui)道(dao)交(jiao)通(tong)48v通(tong)信電源(yuan)(yuan)系(xi)統(tong)必須是獨立的(de)(de)供電系(xi)統(tong)，必須要(yao)(yao)滿足第一類(lei)電源(yuan)(yuan)要(yao)(yao)求，取得兩路可靠(kao)獨立的(de)(de)電源(yuan)(yuan)，其中(zhong)一路為專盤專線。當然還要(yao)(yao)城市軌(gui)道(dao)交(jiao)通(tong)通(tong)信電源(yuan)(yuan)設(she)備應(ying)滿足通(tong)信設(she)備對電源(yuan)(yuan)可靠(kao)性的(de)(de)要(yao)(yao)求。滿足其不間斷供電的(de)(de)需求。最(zui)后對要(yao)(yao)求直(zhi)(zhi)(zhi)流供電的(de)(de)通(tong)信設(she)備，應(ying)采用集中(zhong)方式(shi)供電。直(zhi)(zhi)(zhi)流48v通(tong)信電源(yuan)(yuan)系(xi)統(tong)可由直(zhi)(zhi)(zhi)流配電盤、整(zheng)流模(mo)塊、直(zhi)(zhi)(zhi)流變(bian)換器、逆變(bian)器、閥控式(shi)密閉鉛蓄電池(chi)組組合機架(jia)組成，并應(ying)具有遙信、遙測(ce)、遙控性能(neng)和標(biao)準的(de)(de)接口(kou)及通(tong)信協議。