---

1. (normative) Interpretation of mode and behaviour 156

2. (normative) Local I Remote concept 158

3. (informative) Deprecated logical node classes 160

Annex D (informative) Relationship between this standard and IEC 61850-5 161

Annex E (informative) Algorithms used in logical nodes for automatic control 162

Annex F (normative) Statistical calculation 167

Annex G (normative) Functional relationship of data objects of autorecloser RREC 172

Annex H (normative) SCL enumerations 173

Bibliography 179

1. - Overview of this standard 12

2. - LOGICAL NODE relationships 21

Figure E.1 - Example of curve based on an indexed gate position providing water flow 162

Figure E.2 - Example of curve based on an indexed guide vane position (x axis) vs. net

head (y axis) giving an interpolated runner blade position (Z axis) 163

Figure E.3 - Example of a proportional-integral-derivate controller 164

Figure E.4 - Example of a power stabilisation system 165

5. 5 - Example of a ramp generator 165

Figure E.6 - Example of an interface with a set-point algorithm 166

5. 1 - Statistical calculation of a vector 168

6. 2 - Examples of statistical calculations 170

7. 1 - Diagram of autorecloser function 172

Table 1 - List of logical node groups 19

Table 2 - Interpretation of logical node tables 20

Table 3 - Relation between IEC 61850-5 and IEC 61850-7-4 for automatic control LNs 27

Table 4 - Relation between IEC 61850-5 and IEC 61850-7-4 for control LNs 32

Table 5 - Conditional attributes in FPID 39

Table 6 - Relation between IEC 61850-5 and IEC 61850-7-4 for metering and measurement LNs 50

Table 7 - Relation between IEC 61850-5 and IEC 61850-7-4 (this standard) for protection LNs 60

Table 8 - Relation between IEC 61850-5 and IEC 61850-7-4 for protection related LN 80

Table 9 - Relation between IEC 61850-5 and IEC 61850-7-4 for supervision and monitoring LNs 87

Table 10 - Description of data objects 117

Table A.1 - Values of mode and behaviour 156

1. 2 - Definition of mode and behaviour 1571 - Relationship between Loc/Rem data objects and control authority 159

Table D.1 - Relationship between IEC 61850-5 and this standard for some miscellaneous LNs 161INTERNATIONAL ELECTROTECHNICAL COMMISSION

COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION -

Part 7-4: Basic communication structure -
Compatible logical node classes and data object classes

FOREWORD

1. The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)’’). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non­governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2. The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3. IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user.

4. In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5. IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies.

6. All users should ensure that they have the latest edition of this publication.

7. No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8. Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication.

9. Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61850-7-4 has been prepared by IEC technical committee 57: Power systems management and associated information exchange.

This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision.

Future standards in this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition.

The major technical changes with regard to the previous edition are as follows:

• corrections and clarifications according to information letter "IEC 61850-technical issues by the IEC TC 57” (see document 57/963/INF, 2008-07-18);

• extensions for new logical nodes for the power quality domain;

• extensions for the model for statistical and historical statistical data;

• extensions regarding IEC 61850-90-1 (substation-substation communication);

• extensions for new logical nodes for monitoring functions according to IEC 62271; • new logical nodes from IEC 61850-7-410 and IEC 61850-7-420 of general interest. The text of this standard is based on the following documents:

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The content of this part of IEC 61850 is based on existing or emerging standards and applications. In particular the definitions are based upon:

• the specific data objects types defined in IEC 60870-5-101 and IEC 60870-5-103;

• the common class definitions from the Utility Communication Architecture 2.0: Generic Object Models for Substation and Feeder Equipment (GOMSFE) (IEEE TR 1550);

• CIGRE Report 34-03, Communication requirements in terms of data flow within substations, December 1996.

A list of all parts of the IEC 61850 series under the general title Communication networks and systems in substations, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be

• reconfirmed,

• withdrawn,

• replaced by a revised edition, or

• amended.

A bilingual version of this publication may be issued at a later date.

IMPORTANT - The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.INTRODUCTION

This part of IEC 61850 is part of a set of standards, the IEC 61850 series. IEC 61850 defines communication networks and systems for power utility automation, and more specially the communication architecture for subsystems such as substation automation systems. The sum of all subsystems may result also in the description of the communication architecture for the overall power system management. The defined architecture provided in specific parts of IEC 61850-7-x gives both a power utility specific data model and a substation domain specific data model with abstract definitions of data objects classes and services independently from the specific protocol stacks, implementations, and operating systems. The mapping of these abstract classes and services to communication stacks is outside the scope of IEC 61850-7-x and may be found in IEC 61850-8-x and in IEC 61850-9-x.

IEC 61850-7-1 gives an overview of the basic communication architecture to be used for all applications in the power system domain. IEC 61850-7-3 defines common attribute types and common data classes related to all applications in the power system domain. The attributes of the common data classes may be accessed using services defined in IEC 61850-7-2. These common data classes are used in this part to define the compatible data object classes.

To reach interoperability, all data objects in the data model need a strong definition with regard to syntax and semantics. The semantics of the data objects is mainly provided by names assigned to common logical nodes defined in this part and the data objects they contain, as defined in this basic part, and dedicated logical nodes defined in domain specific parts such as for hydro power control systems. Interoperability is easiest if as much as possible of the data objects are defined as mandatory. Because of different approaches and technical features, some data objects, especially settings, were declared as optional in this edition of the standard. There are also data objects which were declared as conditional, i.e. they will become mandatory under some well-defined conditions. After some experience has been gained with this standard, this decision may be reviewed in the next edition of this part.

It should be noted that data objects with full semantics are only one of the elements required to achieve interoperability. The standardized access to the data objects is defined in compatible, power utility and domain specific services (see IEC 61850-7-2). Since data objects and services are hosted by devices (IED), a proper device model is also needed. To describe both the device capabilities and the interaction of the devices in the related system, a configuration language is also needed, as defined in IEC 61850-6 by the substation configuration description language (SCL).

The compatible logical node name and data object name definitions found in this part and the associated semantics are fixed. The syntax of the type definitions of all data objects classes is governed by abstract definitions provided in IEC 61850-7-2 and IEC 61850-7-3. Not all features of logical nodes are listed in this part; for example, data sets and logs are covered in IEC 61850-7-2.COMMUNICATION NETWORKS AND
SYSTEMS FOR POWER UTILITY AUTOMATION -

Part 7-4: Basic communication structure -
Compatible logical node classes and data object classes

1 Scope

This part of IEC 61850 specifies the information model of devices and functions generally related to common use regarding applications in systems for power utility automation. It also contains the information model of devices and function-related applications in substations. In particular, it specifies the compatible logical node names and data object names for communication between intelligent electronic devices (IED). This includes the relationship between logical nodes and data objects.

The logical node names and data object 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 lEDs in systems for power utility automation and, especially, with lEDs in substations and on distribution feeders. The naming conventions of IEC 61850-7-2 are applied in this part.

To avoid private, incompatible extensions, this part specifies normative naming rules for multiple instances and private, compatible extensions of logical node (LN) classes and data object names. Any definition is based on IEC 61850 or on referenced well identified public documents.

This part does not provide tutorial material. It is recommended to read parts IEC 61850-5 and IEC 61850-7-1 first, in conjunction with IEC 61850-7-3, and IEC 61850-7-2.

This standard is applicable to describe device models and functions of substation and feeder equipment. The concepts defined in this standard are also 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 standard. The groups of logical nodes defined in this standard are shown in Figure 1, ordered according to some semantic meaning, for instance different control levels such as plant level, unit level, etc. For convenience, the logical nodes are defined below in alphabetical order.

General LN information

System LNs .. . L

Interface LNs ... /

Unit/Вау level... С, P, R,...

Process/Equipment level. K, S, X, T, Y, Z

General use ... G, F

Data semantics

Annex

/ЕС 1102/03

Figure 1 - Overview of this standard

2. Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 60270:2000, High-voltage test techniques - Partial discharge measurements

IEC 61000-4-7:2002, Electromagnetic compatibility (EMC) - Part 4-7; Testing and measurement techniques - General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto

IEC 61000-4-15, Electromagnetic compatibility (EMC) - Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications

IEC 61850-2, Communication networks and systems in substations - Part 2: Glossary

IEC 61850-5, Communication networks and systems in substations - Part 5: Communication requirements for functions and device models

IEC 61850-7-1: 1, Communication networks and systems for power utility automation - Part

7-1: Basic communication structure - Principles and models

To be published.

IEC 61850-7-2: ², Communication networks and systems for power utility automation - Part

7-2: Basic information and communication structure - Abstract communication service interface (ACS!)

IEC 61850-7-3: 3, Communication networks and systems for power utility automation - Part

7-3: Basic communication structure - Common data classes

IEC 61850-9-2, Communication networks and systems for power utility automation - Part 9-2: Specific Communication Service Mapping (SCSM) - Sampled values over ISO/IEC 8802-3

IEEE C37.111:1999, IEEE Standard Common Format for Transient Data Exchange (COMTRADE) for Power Systems

IEEE 519:1992, IEEE Recommended Practises and Requirements for Harmonic Control in Electrical Power Systems

IEEE C37.2:1996, Electrical Power System Device Function Numbers and Contact Designation

IEEE 1459:2000, IEEE Trial-Use Standard Definitions for the Measurement of Electric Power Quantities Under Sinusoidal, Nonsinusoidal, Balanced, or Unbalanced Conditions

IEEE 1588, Precision clock synchronization protocol for networked measurement and control systems

2. Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61850-2 and IEC 61850-7-2 apply.

2. Abbreviated terms

The following terms are used to build concatenated data object names. For example, ChNum is constructed by using two terms "Ch" which stands for "Channel" and "Num" which stands for "Number". Thus the concatenated name represents a "channel number".