Communication networks and systems for power utility automation - Part 1-2: Guideline on extending IEC 61850

IEC TS 61850-1-2:2020, which is a technical specification, is intended for any users but primarily for standardization bodies that are considering using IEC 61850 as a base standard within the scope of their work and are willing to extend it as allowed by the IEC 61850 standards. This document identifies the required steps and high-level requirements in achieving such extensions of IEC 61850 and provides guidelines for the individual steps.
Within that scope, this document addresses the following cases:
• The management of product-level standards for products that have an interface based on IEC 61850
• The management of domain-level standards based on IEC 61850
• The management of transitional standards based on IEC 61850
• The management of private namespaces based on IEC 61850
• The development of standards offering the mapping of IEC 61850 data model at CDC level
• The development and management of IEC 61850 profiles for domains (underlying the role of IEC TR 62361-103 and IEC TR 61850-7-6)
This document includes both technical and process aspects:
On the technical side, this document:
• Reminds the main basic requirements (mostly referring to the appropriate parts of the series which host the requirements or recommendations)
• Lists all possible flexibilities offered by the standards
• Defines which flexibilities are allowed/possible per type of extension cases
On the process side, the document covers:
• The initial analysis of how the existing IEC 61850 object models and/or communication services may be applied and what allowed extensions may be required for utilizing them in new or specific domains (including private ones). The results of that step are expected to be documented
• The extension of the IEC 61850 object models for new domains. The typical associated work is to identify existing logical nodes which can be reused "as is", to determine if existing logical nodes can be extended, or to define new logical nodes
• The purpose and process to use transitional namespaces, which are expected to be merged eventually into an existing standard namespace
• The management of standard namespaces
• The development of private namespaces

General Information

Status
Published
Publication Date
15-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
16-Jun-2020
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IEC TS 61850-1-2
Edition 1.0 2020-06
TECHNICAL
SPECIFICATION
colour
inside
Communication networks and systems for power utility automation –
Part 1-2: Guidelines on extending IEC 61850
IEC TS 61850-1-2:2020-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 61850-1-2
Edition 1.0 2020-06
TECHNICAL
SPECIFICATION
colour
inside
Communication networks and systems for power utility automation –
Part 1-2: Guidelines on extending IEC 61850
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-8471-1

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 61850-1-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative References ..................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Key principles reminder ................................................................................................. 10

4.1 General ................................................................................................................. 10

4.2 Namespace introduction........................................................................................ 10

4.2.1 General ......................................................................................................... 10

4.2.2 Basic namespaces ......................................................................................... 11

5 Main cases of extensions of IEC 61850 ......................................................................... 12

5.1 Namespace extensions and associated rules ........................................................ 12

5.1.1 General ......................................................................................................... 12

5.1.2 Domain namespaces ..................................................................................... 12

5.1.3 Product standard namespaces ....................................................................... 12

5.1.4 Transitional namespaces ............................................................................... 12

5.1.5 Private namespaces ...................................................................................... 13

5.2 IEC 61850 profiles for domains ............................................................................. 13

5.3 Mapping of IEC 61850 data model to other protocols at CDC level ........................ 13

6 What to extend in relation with IEC 61850? ................................................................... 13

6.1 List of basic requirements ..................................................................................... 13

6.1.1 General ......................................................................................................... 13

6.1.2 IEC 61850 structure reminder ........................................................................ 13

6.1.3 Main deliverables and their positioning in IEC 61850 documentation

structure ........................................................................................................ 15

6.1.4 Intellectual property requirements .................................................................. 16

6.1.5 Editorial Recommendations ........................................................................... 17

6.1.6 Data Model extension requirements ............................................................... 17

6.1.7 XML namespace extensions .......................................................................... 26

6.1.8 Cyber-security requirements .......................................................................... 27

6.1.9 Conformance Testing requirements ............................................................... 27

6.1.10 Maintenance of standard extension document ............................................... 27

6.1.11 Backward compatibility treatment................................................................... 31

6.2 List of IEC 61850 flexibilities ................................................................................. 33

6.2.1 General ......................................................................................................... 33

6.2.2 Data Model flexibilities ................................................................................... 33

6.2.3 Communication services ................................................................................ 35

6.2.4 SCL language ................................................................................................ 35

6.3 Allowed flexibilities per extension cases................................................................ 37

7 The main activities for extending IEC 61850 .................................................................. 39

7.1 Typical activities applying to all types of extension................................................ 39

7.1.1 General ......................................................................................................... 39

7.1.2 List the main use cases for extending IEC 61850 -> deliverable P1 ............... 40

7.1.3 Ensure knowledge of the existing IEC 61850 content ..................................... 40

7.1.4 Identify possible IEC 61850 gaps ................................................................... 40

7.1.5 Build-up IEC 61850 extensions ...................................................................... 40

7.1.6 Maintain IEC 61850 extensions ...................................................................... 40

---------------------- Page: 4 ----------------------
IEC TS 61850-1-2:2020 © IEC 2020 – 3 –
7.2 Define a standard namespace (product, domain or transitional) – if needed –

-> deliverable P2a or P2b ..................................................................................... 40

7.2.1 General ......................................................................................................... 40

7.2.2 Get a model manager nominated ................................................................... 41

7.2.3 Get the proposed model reviewed .................................................................. 41

7.2.4 Publish a namespace extension ..................................................................... 41

7.3 Define "standard" profile(s) – if needed – deliverable P3 (and P4) ........................ 42

7.3.1 General ......................................................................................................... 42

7.3.2 Define interoperability objectives ................................................................... 42

7.3.3 Publish profile(s) -> deliverable P3 ................................................................ 42

7.3.4 Publish profile(s) testing -> deliverable P4 ..................................................... 42

Annex A (informative) IEC 61850 roadmap (example) .......................................................... 43

Bibliography .......................................................................................................................... 45

Figure 1 – IEC 61850 documentation structure ..................................................................... 14

Figure 2 – Extensions deliverables positioned in the IEC 61850 document structure ............. 15

Figure 3 – Handling versioning information for official IEC publication .................................. 28

Figure 4 – Handling versioning information during the internal IEC writing process ............... 29

Figure 5 – Example of tissue fix sequence and its impact on versioning information ............. 30

Figure 6 – Activities related to IEC 61850 extensions ............................................................ 39

Figure A.1 – Example of IEC 61850 roadmap ........................................................................ 44

Table 1 – Typical deliverables attached to IEC 61850 extensions ......................................... 16

Table 2 – Normative information related to a namespace (for example for

IEC61850‑7‑420:2009A release 5) ........................................................................................ 19

Table 3 – Informative information related to a namespace (for example for

IEC61850‑7‑420:2009A release 5) ........................................................................................ 19

Table 4 – Classification of Abbreviations in regards of their contribution to form a DO

Name (examples) .................................................................................................................. 23

Table 5 – Semantic description frame and requirements ....................................................... 25

Table 6 – Typical compatibility assessment........................................................................... 31

Table 7 – Typical compatibility assessment and associated compatibility rules –

detailed discussion ............................................................................................................... 31

Table 8 – Typical compatibility table ..................................................................................... 32

Table 9 – Allowed flexibilities per extension cases ................................................................ 37

---------------------- Page: 5 ----------------------
– 4 – IEC TS 61850-1-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMMUNICATION NETWORKS AND SYSTEMS
FOR POWER UTILITY AUTOMATION –
Part 1-2: Guidelines on extending IEC 61850
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

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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

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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

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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.

The main task of IEC technical committees is to prepare International Standards. In exceptional

circumstances, a technical committee may propose the publication of a Technical Specification

when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

Technical specification IEC TS 61850-1-2 has been prepared by IEC technical committee

TC 57: Power systems management and associated information exchange.
---------------------- Page: 6 ----------------------
IEC TS 61850-1-2:2020 © IEC 2020 – 5 –
The text of this technical specification is based on the following documents:
DTS Report on voting
57/2084/DTS 57/2145/RVDTS

Full information on the voting for the approval of this technical specification can be found in the

report on voting indicated in the above table.

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

A list of all parts in the IEC 61850 series, published under the general title Communication

networks and systems, 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
• transformed into an International standard,
• 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.

---------------------- Page: 7 ----------------------
– 6 – IEC TS 61850-1-2:2020 © IEC 2020
COMMUNICATION NETWORKS AND SYSTEMS
FOR POWER UTILITY AUTOMATION –
Part 1-2: Guidelines on extending IEC 61850
1 Scope

This part of IEC 61850, which is a technical specification, is intended for any users but primarily

for standardization bodies that are considering using IEC 61850 as a base standard within the

scope of their work and are willing to extend it as allowed by the IEC 61850 standards. This

document identifies the required steps and high-level requirements in achieving such

extensions of IEC 61850 and provides guidelines for the individual steps.
Within that scope, this document addresses the following cases:

• The management of product-level standards for products that have an interface based on

IEC 61850
• The management of domain-level standards based on IEC 61850
• The management of transitional standards based on IEC 61850
• The management of private namespaces based on IEC 61850

• The development of standards offering the mapping of IEC 61850 data model at CDC level

• The development and management of IEC 61850 profiles for domains (underlying the role

of IEC TR 62361-103 and IEC TR 61850-7-6)
This document includes both technical and process aspects:
On the technical side, this document:

• Highlights the main basic requirements (mostly referring to the appropriate parts of the

series which host the requirements or recommendations)
• Lists all possible flexibilities offered by the standards
• Defines which flexibilities are allowed/possible per type of extension cases
On the process side, the document covers:

• The initial analysis of how the existing IEC 61850 object models and/or communication

services may be applied and what allowed extensions may be required for utilizing them in

new or specific domains (including private ones). The results of that step are expected to

be documented

• The extension of the IEC 61850 object models for new domains. The typical associated work

is to identify existing logical nodes which can be reused "as is", to determine if existing

logical nodes can be extended, or to define new logical nodes

• The purpose and process to use transitional namespaces, which are expected to be merged

eventually into an existing standard namespace
• The management of standard namespaces
• The development of private namespaces
---------------------- Page: 8 ----------------------
IEC TS 61850-1-2:2020 © IEC 2020 – 7 –
2 Normative References

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 61400‑25 (all parts), Wind energy generation systems – Part 25‑1: Communications for

monitoring and control of wind power plants – Overall description of principles and models

IEC 61850-8 (all parts), Communication networks and systems for power utility automation

IEC TR 61850‑1, Communication networks and systems for power utility automation – Part 1:

Introduction and overview

IEC TS 61850‑2, Communication networks and systems for power utility automation – Part 2:

Glossary

IEC 61850‑5, Communication networks and systems for power utility automation – Part 5:

Communication requirements for functions and device models

IEC 61850‑6, Communication networks and systems for power utility automation – Part 6:

Configuration description language for communication in electrical substations related to IEDs

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

Basic communication structure – Principles and models

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

Basic information and communication structure – Abstract communication service interface

(ACSI)

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

Basic communication structure – Common data classes

IEC 61850‑7‑4:2010, Communication networks and systems for power utility automation –

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

classes

IEC TR 61850‑7‑6, Communication networks and systems for power utility automation –

Part 7‑6: Guideline for definition of Basic Application Profiles (BAPs) using IEC 61850

IEC TS 61850‑7‑7, Communication networks and systems for power utility automation –

Part 7‑7: Machine‑processable format of IEC 61850‑related data models for tools

IEC 61850‑8‑1, Communication networks and systems for power utility automation – Part 8‑1:

Specific communication service mapping (SCSM) – Mappings to MMS (ISO 9506‑1 and ISO

9506‑2) and to ISO/IEC 8802‑3

IEC TS 61850‑80‑1, Communication networks and systems for power utility automation –

Part 80‑1: Guideline to exchanging information from a CDC‑based data model using
IEC 60870‑5‑101 or IEC 60870‑5‑104

IEC TS 61850‑80‑4, Communication networks and systems for power utility automation –

Part 80‑4: Translation from the COSEM object model (IEC 62056) to the IEC 61850 data model

IEC 61850-9 (all parts), Communication networks and systems for power utility automation

---------------------- Page: 9 ----------------------
– 8 – IEC TS 61850-1-2:2020 © IEC 2020

IEC 62271‑3:2015, High‑voltage switchgear and controlgear – Part 3: Digital interfaces based

on IEC 61850

IEC 61869‑9, Instrument transformers – Part 9: Digital interface for instrument transformers

IEC TR 62361‑103, Power systems management and associated information exchange –
Interoperability in the long term – Part 103: Standard profiling

IEC 62351 (all parts), Power systems management and associated information exchange –

Data and communications security

IEEE 1815.1, Standard for Exchanging Information between networks Implementing IEC 61850

and IEEE Std 1815 (Distributed Network Protocol – DNP3)
"Guidelines for code components" document accessible at:
http://www.iec.ch/tc57/supportdocuments
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
code component

part of a standard document which has to be copied/modified from the IEC publication by any

potential users of the standards.

Note 1 to entry: Code Components are components included in IEC standards that are intended to be directly

processed by a computer and also includes any text found between the markers and ENDS>, or otherwise clearly labelled in this standard as a Code Component.
3.2
namespace
domain in which any name and its related information is univocal
3.3
IEC 61850 basic namespace
data model namespace hosted in the IEC 61850 core standard (namely related to
IEC 61850-7-2, IEC 61850-7-3, IEC 61850-7-4 parts)
Note 1 to entry: Refer to IEC 61850-7-1, "Namespace".

Note 2 to entry: The 61850-7-4 namespace content may be revised in future in order to discriminate the elements

which are generic from the ones which are substation specific.
3.4
IEC 61850 domain namespace

data model namespace which extends IEC 61850 with the purpose of better supporting an

application domain
Note 1 to entry: Refer to IEC 61850-7-1, "Namespace".
---------------------- Page: 10 ----------------------
IEC TS 61850-1-2:2020 © IEC 2020 – 9 –
3.5
IEC 61850 product namespace

data model namespace which extends IEC 61850 with the purpose of better supporting a

specific product (like switchgear) or function (like metering)
Note 1 to entry: Refer to IEC 61850-7-1, "Namespace".
3.6
IEC 61850 private namespace

private data model namespace which extends IEC 61850 with the purpose of better supporting

a private implementation or specification of IEC 61850
Note 1 to entry: Refer to IEC 61850-7-1, "Namespace".
3.7
IEC 61850 transitional namespace

data model namespace which has the goal to expose a proposed extension of the data model

to the market, before being formally embedded into a standard (product, domain or basic)

namespace
Note 1 to entry: Refer to IEC 61850-7-1, "Namespace".

Note 2 to entry: Transitional namespaces are supposed to have a limited time life, their future being to be integrated

into standard namespaces (or standard namespace extensions). At the time of the integration of transitional

namespace into the concerned standard parts, backward compatibility may be broken to take into account market

feedbacks.
3.8
IEC 61850 core standard

standard from the following list: IEC 61850-5, IEC 61850-6, IEC 61850-7-1, IEC 61850-7-2,

IEC 61850-7-3, IEC 61850-7-4, IEC 61850-8-x, IEC 61850-9-x
3.9
IEC 61850 flexibility
option or user-free area stated as such in the IEC 61850 standards
3.10
IEC 61850 extension

additional element or requirement, taking advantage of the IEC 61850 flexibilities, and which

therefore goes beyond the original definition/mandatory requirements of IEC 61850 as stated

in the IEC 61850 standards

Note 1 to entry: Typical extensions of IEC 61850 are new namespaces, including new LNs, and/or new data objects,

or more stringent requirements for presence of DOs/Attributes than required by the IEC 61850 core standards,

additional rules for naming LN prefixes, LDs, IEDs, etc.
3.11
model managers team

team within the IEC in charge of handling/maintaining the IEC 61850 model throughout the

different IEC publications and the different IEC entities, and in charge of preserving its

consistency, as well as its backward compatibility
3.12
profile
agreed-upon subset of requirements derived from a specification

Note 1 to entry: A common profile is required for achieving interoperability especially in those cases when a

specification could have more than one interpretation and there are probably many optional features. Refer to IEC TR

62361-103 and IEC TR 61850-7-6 for more in-depth content on profiles and profiling.

3.13
tissue
technical issue related to an IEC 61850 part
---------------------- Page: 11 ----------------------
– 10 – IEC TS 61850-1-2:2020 © IEC 2020
4 Key principles reminder
4.1 General

This clause summarizes some main IEC 61850 principles needed for understanding of the rest

of the document.
4.2 Namespace introduction
4.2.1 General

Considering that namespaces can be handled by multiple entities, which can evolve over time

at different speeds, IEC 61850 introduced the following namespace concepts and requirements

from the beginning (Refer to IEC 61850-7-1, "Namespaces" (Clause 13 in Edition 2,

Amendment 1 ).):

• The concept of namespaces: namespaces are largely used and widespread in the IT world

to organize the names or identifiers of data types, data objects, functions, etc. into logical

sets in order to prevent name collisions that can occur when these are being defined in

parallel. In the specific case of IEC 61850, namespaces are a defined but structured

collection of logical nodes (LN), data objects and potentially common data classes (CDC)

and attributes. Each IEC publication which extends the IEC 61850 data models shall have

its own namespace. Each private extension of IEC 61850 shall also have its own

namespace. Each namespace has a unique "machine" name, i.e. a name which can be used

by a machine to uniquely refer to the semantic attached to a data.
• The concept of namespace owner: IEC TC 57 is the owner of the basic namespaces
...

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