在城(cheng)市軌道交通通信(xin)中其(qi)48v通信(xin)電(dian)(dian)(dian)源起(qi)到的(de)作用是(shi)十分(fen)重要(yao)的(de)，他的(de)功能(neng)就(jiu)是(shi)保(bao)證(zheng)其(qi)穩定、可(ke)(ke)靠(kao)和安全(quan)。穩定要(yao)求其(qi)供(gong)電(dian)(dian)(dian)的(de)電(dian)(dian)(dian)壓和頻率的(de)波(bo)動(dong)都必須在其(qi)允許的(de)范圍之(zhi)內。可(ke)(ke)靠(kao)電(dian)(dian)(dian)源是(shi)指能(neng)保(bao)證(zheng)晝夜不間斷供(gong)電(dian)(dian)(dian)的(de)獨立電(dian)(dian)(dian)源。安全(quan)是(shi)指電(dian)(dian)(dian)源設備要(yao)采(cai)取保(bao)障(zhang)安全(quan)的(de)措施。 

       首先我(wo)們要保證城(cheng)市軌道(dao)交通(tong)(tong)48v通(tong)(tong)信(xin)電(dian)(dian)(dian)(dian)源系統必(bi)須(xu)(xu)是獨立(li)的(de)供(gong)電(dian)(dian)(dian)(dian)系統，必(bi)須(xu)(xu)要滿(man)足第一(yi)類電(dian)(dian)(dian)(dian)源要求(qiu)(qiu)，取得(de)兩路可(ke)(ke)靠(kao)獨立(li)的(de)電(dian)(dian)(dian)(dian)源，其(qi)中一(yi)路為(wei)專(zhuan)盤專(zhuan)線。當(dang)然還要城(cheng)市軌道(dao)交通(tong)(tong)通(tong)(tong)信(xin)電(dian)(dian)(dian)(dian)源設備應(ying)滿(man)足通(tong)(tong)信(xin)設備對電(dian)(dian)(dian)(dian)源可(ke)(ke)靠(kao)性(xing)的(de)要求(qiu)(qiu)。滿(man)足其(qi)不間斷(duan)供(gong)電(dian)(dian)(dian)(dian)的(de)需求(qiu)(qiu)。最(zui)后(hou)對要求(qiu)(qiu)直流(liu)(liu)(liu)供(gong)電(dian)(dian)(dian)(dian)的(de)通(tong)(tong)信(xin)設備，應(ying)采用集中方式供(gong)電(dian)(dian)(dian)(dian)。直流(liu)(liu)(liu)48v通(tong)(tong)信(xin)電(dian)(dian)(dian)(dian)源系統可(ke)(ke)由(you)直流(liu)(liu)(liu)配電(dian)(dian)(dian)(dian)盤、整流(liu)(liu)(liu)模(mo)塊、直流(liu)(liu)(liu)變(bian)換器、逆變(bian)器、閥控式密(mi)閉鉛蓄(xu)電(dian)(dian)(dian)(dian)池組組合機架組成，并應(ying)具有遙(yao)信(xin)、遙(yao)測、遙(yao)控性(xing)能和標(biao)準的(de)接口及通(tong)(tong)信(xin)協(xie)議(yi)。