变电站通信网络和系统标准 变电站通信网络和系统第7-2 部分:变电站和线路(馈 线)设备的基本通信结构 抽象通信服务接口(acsi)-Standards for substation communication networks and systems communication networks and systems in substations Part 7-2: Substation and line (feeder) Basic communication structure