Do You Know Differences Between Edition 1 and Edition 2 of Standard IEC 61850?

Do You Know Differences Between Edition 1 and Edition 2 of Standard IEC 61850?

The IEC-61850 first version was published between 2001 and 2004. Since then, each part has been revised and extended towards a version 2 to content improve and respond to needs of others aspects in electric sector. In the first edition, standard’s authors published around 800 TISSUEs (Technical Issues) that generated comments and potential solutions to problems encountered. Table 1 present historical evolution summary each standard section showing list of changes pointed out by the IEC.


Edition 1


Main Changes

Part 1: Introduction and overview

2003 / 37 pp

2013 / 73 pp

  • Scope Extension of IEC61850 standard.
  • Quality Energy Properties.
  • Statistics and Historic Data.
  • Distribution, generation, monitoring and automation.
  • Substation to Substation Communication.
  • Smart Grid Consideration.

Part 2: Glossary.





Part 3: General Requirements.

2002 / 33 pp

2013 / 136 pp

Requirements are in line with other equipment used in same environment (e.g., protection relays)

  • Addition product safety based on IEC 60255-27
  • EMC requirements on line and entire with IEC 60255 and IEC 61000-6-5.

Part 4: System and Project Management.

2002 / 59 pp

2011 / 74 pp

This second edition constitutes a technical revision to unify document with other IEC 61850 standard parts, in addition extending scope of substation automation systems to all used automation systems.

Part 5: Communication requirements for functions and device models.

2003 / 131 pp

2013 / 306 pp

  • Extension of automation systems for substation to automation systems used.
  • Interfaces inclusion for substations communication.
  • Communication requirements beyond substation limit.

Part 6: Configuration language for communication in electrical substations related to IEDs.

2004 / 144 pp

2009 / 215 pp

  • Adding functional extensions based on other parts IEC 61850 changes, especially by IEC 61850-7-2 and IEC 61850-7-3.
  • Adding functional extensions on engineering processes, especially for configuration data exchange between systems configuration tools.
  • Adición de extensiones funcionales sobre el proceso de ingeniería, especialmente para configuración de intercambio de datos entre herramientas de configuración de sistemas.
  • Clarifications and corrections.

Part 7.1: Basic communication structure – Principles and models

2003 / 110 pp

2011 / 289

Information models for specific substation on automatic systems power.

  • Device functions used on process automation.
  • Communication systems to provide interoperability within public energy service places compared to first edition, this second edition features:
    • Model for data and statistical historic.
    • Concept Proxies, gateways, hierarchies LD and inputs LN.
    • Time sychoronization Models
    • Extension log function. It also clarifies certain items.

Part 7.2: Basic communication structure – Abstract communication service interface (ACSI).

2003 / 171 pp

2010 / 213 pp

Some types of data not required have been removed.

  • Added logging service for blocks of control.
  • Fixed IEC 62351 series safety.

Part 7.3: Basic communication structure – in electrical substations related to IEDs.

2003 / 64 pp

2010 / 182 pp

This second edition defines new common data classes used by new standards definition models objects based on IEC 61850 for statistical data representation and historical.

Part 7.4: Basic communication structure in electrical substations related to IEDs – Common Data Classes.

2003 / 104 pp

2010 / 179 pp

  • Correction and clarification according to technical problems presented by users.
  • Extensions for model historical statistics data.
  • Extensions for new logical nodes for domain quality of energy.
  • Extensions for IEC 61850-90-1.
  • Extensions for new logical nodes for functions monitoring based on IEC 672271.
  • New logical nodes for IEC 61850-7-410 and IEC 61850-7-420 to general interest.

Part 8.1: Specific communication service mapping (SCSM) – Mappings to Manufacturing Message Specification MMS (ISO 9506-1 and ISO 9506-2) and to ISO/IEC 8802-3.

2004 / 133 pp

2011 / 386 pp

  • Gigabit Ethernet support.
  • Link layer redundancy.
  • Extensions object reference length.
  • Following for mapping service.
  • Second objectReference mapping when is used on tracking or like link.
  • Message GOOSE simulation.
  • SCL erase on control block.

Part 9.1: Specific communication service mapping (SCSM) – Sampled values over serial unidirectional multidrop point to point link.

2003 / 29 pp

Replaced by: IEC 61850-9-2:2011


Part 9.2: Specific communication service mapping (SCSM) – Sampled values over ISO/IEC 8802-3.

2004 / 28 pp

2011 / 65 pp

Adding link layer redundancy

  • Redefinition “reserved” fields on link layer.
  • Components USVCB and MSVCB evolution.
  • Buffer sampled value transmission encoding evolution.

Part 10: Conformance Testing.

2005 / 43 pp

2012 / 170 pp

  • Updates for devices server test procedures.
  • Addition of some test procedures (according to client device, sampled values devices, GOOSE performance).

According these matters are corrections, clarifications, new functionality and the Elimination of features obsolete, others aspects such as:

  • Added new sections parts such as the IEC-61850-80-1: a guide for information exchange from model Common Data Class Objects (CDC) using IEC 60870-5-101 or IEC 60870-5-104; In addition to models devices for Hydro-electric, Wind, Distributed Energy Resource and Power Quality.
  • Object name longitude change from 64 to 128 characters.
  • Logical Device hierarchy allowed.
  • Extended SCL use to allow design bottom-up systems and multiple projects. The extensions are assigned. IID (Instantiated IED Description) and. SSD (System Specification Description).
  • Added “tracking service” that replaces changes monitoring in outputs.
  • Defined redundant system communication, where it is suggested HSR and PRP (Parallel Redundancy Protocol) Protocol (High-availability Seamless Redundancy).
  • Improvements testing aspects for customers and sampled-values configuration language processors. Allowed to define a test mode for a function through the object Logical Mod Node LLN0. With “TEST-BLOCKED” mode help, function inputs are processed but result does not spread by physical outputs.
  • Safety mechanisms definition.
  • Mechanisms definition for declaring Multicast information subscribers (GOOSE and Sampled Values).
  • Rename standard replacing “substation” by “system” to cover further aspects of substation.
  • Erase IEC GSSE.
  • Defined named enums independent whole counters.
  • Added data types and data objects multiples.

Compatibility between versions 1 and 2 was a very important aspect considered. The most basic requirement is the ability to identify version in particular supported devices. In addition, it was necessary to consider environments where merge servers of each version. For communications, there are no major inconveniences. Some ambiguities related to buffered reports were solved. For models, the new version relates to new functionality. If a device supports this new functionality, public on version 2, while an equivalent process for access to this function is performed by a client. Same consideration applies to design tools.

In conclusion, version 2 IEC-61850 Standard Edition improves and wide-ranging features of version 1. These improvements include tests aspects, new functions inclusion and objects types used in modeling of electrical systems. It is compatible with version 1, even up to different versions servers in the same environment can co-exist.

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Written by: PhD. Iván Dario Claros, Gerente R&D – Axon Group

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