IEC TS 61850-80-4:2016

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 TS 61850-80-4:2016(E) defines the one-to-one relationship of IEC 62056 OBIS codes to IEC 61850 Logical Nodes. The purpose is to increase the availability of revenue meter information to other applications defined within the IEC 61850 framework. This increased visibility will contribute to information available for smart grid applications.

General Information

• Status: Published
• Publication Date: 15-Mar-2016
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: TC 57 - Power systems management and associated information exchange
• Drafting Committee: WG 10 - TC 57/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 16-Mar-2016
• Completion Date: 30-Jun-2016

Standards Content (Sample)

IEC TS 61850-80-4 ®
Edition 1.0 2016-03
TECHNICAL
SPECIFICATION
colour
inside
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
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IEC TS 61850-80-4 ®
Edition 1.0 2016-03
TECHNICAL
SPECIFICATION
colour
inside
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-3222-4

– 2 – IEC TS 61850-80-4:2016 © IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Data modelling hierarchy . 8
4.1 General . 8
4.2 IEC 62056 principles . 9
4.3 The data models and the application layer of IEC 62056 . 10
4.4 The IEC 61850 principles . 11
5 Translation of IEC 62056 COSEM objects into IEC 61850-Logical Nodes . 11
5.1 General translation principles . 11
5.1.1 General . 11
5.1.2 IEC 61850 DataTypeTemplates to IEC 62056 Common Data Types . 12
5.2 Translation tables . 13
5.2.1 General . 13
5.2.2 Metering and measurement . 14

Figure 1 – Overview of relationship between data models . 9
Figure 2 – The IEC 62056 framework . 9

Table 1 – IEC 62056 terminology . 7
Table 2 – IEC 61850 terminology . 8
Table 3 – IEC 62056 Register Class . 11
Table 4 – Conventions . 12
Table 5 – Data Type mapping . 12
Table 6 – Column heading descriptions . 13
Table 7 – Metering and measurement logical node classes . 14
Table 8 – MMTR . 14
Table 9 – MMTN . 15
Table 10 – MMXU . 16
Table 11 – MMXN . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

FOREWORD
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• the required support cannot be obtained for the publication of an International Standard,
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• 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.
IEC TS 61850-80-4, which is a technical specification, has been prepared by IEC technical
committee 57: Power systems management and associated information exchange.

– 4 – IEC TS 61850-80-4:2016 © IEC 2016
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
57/1602/DTS 57/1659/RVC
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 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.
A list of all parts of the IEC 61850 series, published under the general title Communication
networks and systems for power utility automation, 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 website 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.

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INTRODUCTION
IEC 61850 defines communication networks and systems for power utility automation, and
more specifically the communication architecture for subsystems such as substation
automation systems, feeder automation systems and SCADA for distributed energy resources.
In essence, IEC 61850 is a description of the communication architecture for the overall
power system management when the combined total of the above mentioned subsystems are
considered.
The devices in the electricity grid are becoming more intelligent with an increasing number of
elements and increasing complexity of data to be processed in a distributed environment.
Introduction of comprehensive data models simplifies the handling and management of the
data drastically since the models can be re-used once standardized. By defining a number of
standardized hierarchical names, it can drastically reduce errors in the field. The names in the
standard can be directly used for the configuration of devices and the communication between
devices.
This part of IEC 61850, which is a technical specification, defines the one-to-one relationship
of IEC 62056 OBIS codes to IEC 61850 Logical Nodes. The purpose is to increase the
availability of revenue meter information to other applications defined within the IEC 61850
framework. This increased visibility will contribute to information available for smart grid
applications.
The other benefit of defining these relationships is in regards to the design of protocol
converters. With a clear specification, test cases can be developed as well as end user
understanding of the quantities is unambiguous. Finally, end user configuration is simplified
by limiting the options for translation.

– 6 – IEC TS 61850-80-4:2016 © IEC 2016
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

1 Scope
Included within the IEC 61850 power utility automation architecture are its concepts, data
models, communication protocols and the mapping data exchanges on the substation
network. This extends beyond just IEDs to other IEC 61850 enabled devices like meters,
system applications and remote access gateways.
This part of IEC 61850, which is a technical specification, considers the requirements of
power utility automation applications; i.e. the scope is limited by the use cases relevant for
meter data exchange in HV/MV substations and MV/LV substations. Only use cases that
require the data exchange involving a revenue meter are considered. Applications not
covered by the existing standards listed in Clause 2 are out of scope.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC TS 61850-2, Communication networks and systems in substations – Part 2: Glossary
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 61850-7-3:2010, 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 62056-6-1:2015, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-1: Object Identification System (OBIS)
IEC 62056-6-2:2016, Electricity metering data exchange – The DLMS/COSEM suite –
Part 6-2: COSEM interface classes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC TS 61850-2 and
IEC 61850-7-2 apply. In addition, the terms and definitions given in IEC 62056-6-1 and
IEC 62056-6-2 apply.
Due to the fact that the same or similar terminology exist from the two standards areas and
may have different meanings, the terminology to be used in this document is explicitly defined
in Table 1 and Table 2. In addition, in some cases, the terms are elaborated to provide more
insight on the application for users who are not experts in the standards area.
Table 1 – IEC 62056 terminology
Term Description
COSEM Companion Specification for Energy Metering according to IEC 62056-6-2.
OBIS Code Object Identification System according to IEC 62056-6-1, uniquely identifying data objects
within COSEM compliant metering equipment.
COSEM Interface The Interface Class (IC) defines the common characteristics (by means of attributes and
Class (IC) methods) of a set data objects. The interface class specifies the characteristics of the objects
encountered at the interface through which a system interacts with the objects.
Implementation issues are not considered.
An IC consists of several attributes and methods. The first attribute is always the “logical
name”.
The set of standardised Interface Classes are defined in IEC 62056-6-2.
COSEM object An Interface class is instantiated by assigning a specific OBIS code to the logical name of the
IC. The result of the instantiation of an IC is a specific data object. The instantiation of an
Interface Class may be part of the meter configuration or part of the production process. A
meter operating in the field contains a set of objects. Data is exchanged by accessing these
objects.
Example: the IC “Register” defines the generic data structure for any metering register
containing 3 attributes (logical name, measured value and the unit).
By assigning the logical name “total electrical energy A+” to the IC “Register” we have formed
a specific data object providing information on the totally energy consumption.
The set of standardised OBIS codes are defined in IEC 62056-6-1.
Class ID(CID) The Class ID identifies a specific class of the set of standardised Interface Classes. For
example, Class_ID of 3 identifies the class type “Register”.
Physical Device A physical device is a subsystem which has a physical connection to a communication
medium and which can be addressed by a physical address. The behaviour of the physical
device is modelled with a set of logical devices.
A physical device must contain a “management logical device”.
Logical Device A logical device is an abstract entity within a physical device. A logical device is addressed
via its Service Access Point (SAP) provided by the communication layer below the application
layer. The behaviour of the logical device is modelled with a set of COSEM objects.
Logical Name The logical name contains an OBIS identifier; it is the first attribute of any object.
By assigning a specific OBIS code to the logical name the IC is instantiated. The OBIS code,
the Class ID and the version of the Interface Class uniquely identifies a data object.
COSEM Attribute A numbered set of attributes form (together with the methods) an interface class.
The first attribute is always the logical name. The nature of the value is described by the logic
name using OBIS identification system. For example, a register may contain the
instantaneous voltage on phase 1. This would correspond to a specific OBIS code stored in
the logical name attribute. The second attribute is a value with a choice of representation
among which is integer and floating point representation. The third attribute is the scaler and
unit. The first method of class register is a method to reset the register.
Common Data Common Data Types are made of simple and complex data types used to describe the
Types attributes of the IC. The typical simple data types include integer and floating point numbers.
Complex data types include array and structures. CHOICE is a data type that allows one of
many representations for an attribute. (see IEC 62056-6-2). The data types are described in
ASN1.
Metering A physical device which may contain multiple logical devices to measure energy usage of
Equipment different media. Equivalent to a Physical Meter.
Common abbreviation for Active Energy import and Active Energy export respectively.
+A and –A
Common abbreviation for Reactive Energy import and Reactive Energy export respectively.
+R and –R
– 8 – IEC TS 61850-80-4:2016 © IEC 2016
Table 2 – IEC 61850 terminology
Term Description
Logical Node The group defines Logical Nodes Classes with similar functions. For example, Group M
Group contains classes related to Metering and Measurement. (See IEC 61850-7-4).
Logical Node Aggregation of data, data sets, report controls, logs, log controls, etc. They represent typical
Class functions of a substation system. For example, Metering for commercial purposes of a 3
phase system (MMTR) is one Logical Node Class. An instance of a Logical Node Class is a
Logical Node and the smallest part of a function that exchanges data. (See IEC 61850-5).
Data Object This is a meaning and representation that is part of a Logical Node Class. For example, “Net
Name reactive energy” is one of many instances of the BCR Common Data Class of the MMTR
Logical Node. (see IEC 61850-7-4).
Common Data This class (See IEC 61850-7-3) is composed of Constructed Attribute Classes, other common
Class (CDC) data classes or types defined in IEC 61850-7-2 (Basic Data Types and Common ACSI
Types).
Constructed These classes are defined in IEC 61850-7-3:2010, Clause 6.
Attribute Class
(CAC)
DataAttribute This class (see IEC 61850-7-3) is composed of relatively simply data structures that are
Type commonly used. Examples include analog value
...