自１９８０年电力系统第一条数字微波———京汉微波建成以来，二十多年来电力系统已经逐步建设形成了以微波通信为主、光缆和卫星通信为辅的电力通信专网。电力通信专网因电网的需求而产生，并一直服务于电网，为电力生产调度部门和管理部门提供行政电话服务、调度电话服务乃 Since the first digital microwave power system in 1980-the completion of microwave in Beijing and the Han Dynasty, the power system has been gradually built in 1980s, forming a power communication network mainly composed of microwave communication and supplemented by optical fiber and satellite communication. The power and communication private network is generated due to the demand of the power grid and has been serving the power grid for providing administrative telephone services for the power production dispatching departments and administrative departments. The dispatching telephone service