Do you know what are the differences between the first edition and second edition of the standard IEC61850?

The first version of standard IEC-61850 was published between 2001 and 2004. Each of parts has since been reviewed and extended to a second version for improving the content and reaching the other requirements of the electrical field. In the first edition, the writers of the standard published about 800 TISSUES (Technical Issues) It generated comments and potential solutions. Table 1 is a summary of the historical evolution of each item of the standard according to the list of the changes indicated for the IEC.



Edition 1

Edition 2

Main changes

Part 1: Introduction and overview.

2003 / 37 pp

2013 / 73 pp

  • Extended application scope of the IEC 61850 standard.
  • Power quality domain.
  • Statistical and historical data.
  • Distributed generation monitoring and automation purpose.
  • For substation to substation communication.
  • Smart grid considerations

Part 2: Glossary.

2003 / 42 pp

Part 3: General requirements.

2002 / 33 pp

2013 / 136 pp

Requirements are in line with those of other equipment used in the same environment (e.g. protection relays):

  • Product safety added based on IEC 60255-27.
  • EMC requirements completed and in line with IEC 60255 series 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 align the document more closely with the other parts of the IEC 61850 series, in addition to enlarging the scope from substation automation systems to all utility automation systems.

Part 5: Communication requirements for functions and device models.

2003 / 131 pp

2013 / 306 pp

  • Extension from substation automation systems to utility automation systems.
  • Inclusion of interfaces for communication between substations.
  • Requirements from communication beyond the boundary of the substation.

L Part 6: Configuration description language for communication in electrical substations related to IEDs’s

2004 / 144 pp

2009 / 215 pp

  • Functional extensions added based on changes in other Parts of IEC 61850, especially in IEC 61850-7-2 and IEC 61850-7-3.
  • Functional extensions concerning the engineering process, especially for configuration data exchange between system configuration tools, added.
  • Clarifications and corrections.

Part 7.1:  Basic communication structure for substation and feeder equipment - Principles and models

2003 / 110 pp

2011 / 289

Substation-specific information models for power utility automation systems.

  • Device functions used for power utility automation purposes.
  • Communication systems to provide interoperability within power utility facilities. Compared to the first edition, this second edition introduces:
    • The model for statistical and historical statistical data.
    • The concepts of proxies, gateways, LD hierarchy and LN inputs.
    • The model for time synchronization.
    • The concepts behind different testing facilities.
    • The extended logging function. It also clarifies certain items.

Part 7.2: Basic information and communication structure - Abstract communication service interface (ACSI)

2003 / 171 pp

2010 / 213 pp

Data types not required have been removed,.

  • Service tracking for control blocks have been added.
  • Security issues are solved by the IEC 62351 series.
  • Service tracking for control blocks have been added.
  • The view concept will be according to the new work on role bases access (RBA).
  • Security issues are solved by the IEC 62351 series.

Part 7.3: Basic communication structure for substation and feeder equipment - Common data classes.

2003 / 64 pp

2010 / 182 pp

This second edition defines new common data classes used for new standards defining object models for other domains based on IEC 61850 and for the representation of statistical and historical data.

Part 7.4: Basic communication structure - Compatible logical node classes and data object classes. 

2003 / 104 pp

2010 / 179 pp

  • Corrections and clarifications according to technical issues raised by the users' community; 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.
  • 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.

Part 8.1; Specific Communication Service Mapping (SCSM) - Mappings to MMS (ISO 9506-1 and ISO 9506-2) and to ISO/IEC 8802-3.

2004 / 133 pp

2011 / 386 pp

  • The support of gigabit Ethernet.
  • The link layer redundancy.
  • The extension of the length of the object reference.
  • the extension of the reason for inclusion type for comprehensive logging.
  • The mapping of the tracking services.
  • A second mapping of the objectReference when used in the tracking services, or as linking.
  • The simulation of GOOSE telegram.
  • The removal of the SCL Control Block.

Part 9.1: Specific Communication Service Mapping (SCSM) - Sampled values over serial unidirectional multidrop point to point link. 

2003 / 29 pp

Remplazada por 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

Addition of an optional link redundancy layer.

  • redefinition of “reserved” reserved" fields in link layer.
  • Evolution of USVCB and MSVCB components.
  • Evolution of encoding for the transmission of the sampled value buffer.

Part 10: Conformance testing.

2005 / 43 pp

2012 / 170 pp

  • Updates to server device conformance test proceduresr.
  • Additions of certain test procedures (client device conformance, sampled values device conformance, (engineering) tool related conformance, GOOSE performance).

This subjects included corrections, explanations, new functions and deleted of obsolete characteristics, among others aspects summarized bellow:


Also, It has added new items like IEC 61850-80-1: A guide for the exchange of the information between the classes commons object model used IEC 60870-5-101 or IEC 60870-5-104; Also models of devices for Hydro-electric, Wind, Distributed Energy Resource and Power Quality

The length of objects name was 64, In the second edition is 128 characters

It is allowed hierarchy of Logical Device

Widespread use of SCL to allow the design buttom-up of systems and multiples projects. It assigned the extensions .IID (Instantiated IED Description) and .SSD (System Specific Description).

It added "service tracking", it replaces the monitoring outputs changes monitoring.

It defined systems of redundant communication, where it suggest the use of the protocol PRP (Parallel Redundant Protocol) and HSR (High-availability Seamless Redundancy)

Improves of aspects for clients test, sampled-values and processors of language configuration. It allowed to defined a test mode for a function through of the object Mod of Logical Node LLN0. With the help of mode "TEST BLOCKED", inputs of the function are processed but the result isn't spread of the physical outputs.

Definition of safety mechanisms.

Definición de un mecanismo para declarar suscriptores de información multicast (GOOSE y Sampled-Values)

Definition of mechanisms to declare subscribers of information multicast (GOOSE and Sample-Value)

It renamed of the standard "substation" by "system" to reach aspects beyond of substation.

It was removed IEC GSSE of the standard

It defined the items appointed, separate of integer counters

It added multiples data types and data objects

The compatibility across version 1 and 2 was an important aspect. The possibility to identify what version support a particular device is the most simple request. Also, It was needed to know environments where servers were mixed for each version. For the communications, there aren't big issues. About it resolve some ambiguities of the buffered reports. For the model, the new version has a function. If a device supports this function, It publishes about version 2, while the client makes an equivalent process for the access to this function. It is the same for the design tools.

In conclusion, the second edition of the standard IEC 61850 improves and extends characteristics of the first edition. The improves include aspects of test, new functions and object types used in the power system modelling.


“It is an intuitive and easy software, It has helped me to resolved issues in the tests. We need this tool.”
Guillermo Condori – Elfec - Bolivia

“I’m done among of different projects for test with your software. It’s a fantastic program for engineering.”
Marco Büttner – Vattefall - SWEDEN