DL/T 860.73－2004(IEC 61850-7-3) 变电站通信网络和系统第7-3 部分：变电站和馈线设备的基本通信结构 公用数据类 -DL/T 860.73-2004 (IEC 61850-7-3) communication networks and systems in substations Part 7-3: substation and feeder equipment, basic communication structure for common data class