我国目前约有５万多个通信局站，预计到２０００年将有１０万多个或更多的通信局站。同时“九五”期间，可靠性差、节能性差的老电源设备也将更新换代。粗略计算，目前地市以上局站大部分换成开关电源，县级通信局站还有３０％～５０％左右是老相控电源。通信电源系统主要由四 At present, there are about 50,000 communication stations in our country and it is estimated that there will be 100,000 or more communication stations by the year 2000. At the same time, during the “Ninth Five-Year Plan” period, the old power equipment with poor reliability and poor energy saving will also be replaced. Rough calculation, most of the station above the city to switch power supply, county communications bureau station about 30% to 50% is the old phase control power supply. Communication power system consists of four