Draft61850-7-4©IEC:2002 -10- 57WG10-12(61850-7-4)R3.0/FD1S COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS Part 7-4:Basic communication structure for substations and feeder equipment-Compatible logical node classes and data classes 1 Scope This part of IEC 61850 specifies the information model of devices and functions related to substation applications.In particular,it specifies the compatible logical node names and data names for communication between Intelligent Electronic Devices (IED).This includes the relationship between Logical Nodes and Data. The Logical Node Names and Data Names defined in this document are part of the class model introduced in IEC 61850-7-1 and defined in IEC 61850-7-2.The names defined in this document are used to build the hierarchical object references applied for communicating with IEDs in substations and on distribution feeders.The naming conventions of IEC 61850-7-2 are applied in IEC 61850-7-4. To avoid private,incompatible extension rules this part IEC 61850-7-4 specifies normative naming rules for multiple instances and private extensions of Logical Node (LN)Classes and Data Names. In the normative Annex A all rules with examples are given for: multiple instances of logical node classes by use of a LN instance identification (ID) multiple instances of data by use of a data instance ID selecting missing data out of the complete data name set creating new logical node classes and data names In the informative Annex B examples are given for: the use of Logical Nodes in complex situations like line protection schemes multiple instances of Logical Nodes with different levels of functionality This part does not provide tutorial material.It is recommended that parts IEC 61850-5 and IEC 61850-7-1 be read first,in conjunction with part IEC 61850-7-3,and-7-2.This part does not discuss implementation issues. This standard is applicable to describe device models and functions of substation and feeder equipment.The concepts defined in this standard may also be applied to describe device models and functions for: substation to substation information exchange substation to control centre information exchange. power plant to control centre information exchange. information exchange for distributed generation, information exchange for distributed automation,or information exchange for metering. Figure 1 provides a general overview of this document. Version 3.0:22.August 2002Draft 61850-7-4  IEC: 2002 – 10 – 57/WG10-12(61850-7-4)R3.0/FDIS Version 3.0: 22. August 2002 COMMUNICATION NETWORKS AND SYSTEMS IN SUBSTATIONS Part 7-4: Basic communication structure for substations and feeder equipment – Compatible logical node classes and data classes 1 Scope This part of IEC 61850 specifies the information model of devices and functions related to substation applications. In particular, it specifies the compatible logical node names and data names for communication between Intelligent Electronic Devices (IED). This includes the relationship between Logical Nodes and Data. The Logical Node Names and Data Names defined in this document are part of the class model introduced in IEC 61850-7-1 and defined in IEC 61850-7-2. The names defined in this document are used to build the hierarchical object references applied for communicating with IEDs in substations and on distribution feeders. The naming conventions of IEC 61850-7-2 are applied in IEC 61850-7-4. To avoid private, incompatible extension rules this part IEC 61850-7-4 specifies normative naming rules for multiple instances and private extensions of Logical Node (LN) Classes and Data Names. In the normative Annex A all rules with examples are given for: • multiple instances of logical node classes by use of a LN instance identification (ID) • multiple instances of data by use of a data instance ID • selecting missing data out of the complete data name set • creating new logical node classes and data names In the informative Annex B examples are given for: • the use of Logical Nodes in complex situations like line protection schemes • multiple instances of Logical Nodes with different levels of functionality This part does not provide tutorial material. It is recommended that parts IEC 61850-5 and IEC 61850-7-1 be read first, in conjunction with part IEC 61850-7-3, and -7-2. This part does not discuss implementation issues. This standard is applicable to describe device models and functions of substation and feeder equipment. The concepts defined in this standard may also be applied to describe device models and functions for: • substation to substation information exchange, • substation to control centre information exchange, • power plant to control centre information exchange, • information exchange for distributed generation, • information exchange for distributed automation, or • information exchange for metering. Figure 1 provides a general overview of this document