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IEC 61850

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IEC 61850 is an important international standard for substation automation that will have a very significant impact on how electric power systems are designed and built for many years to come. IEC61850 is a part of the International Electrotechnical Commission’s (IEC) Technical Committee 57 (TC57) architecture for electric power systems. The model-driven approach of the TC57 standards, including IEC61850, is an innovative approach that requires a new way of thinking about substation automation that will result in very significant improvements in both cost and performance of electric power systems.

The abstract data models defined in IEC61850 can be mapped to a number of protocols. Current mappings in the standard are to MMS (Manufacturing Messaging Specification), GOOSE, SMV, and soon to Web Services. These protocols can run over TCP/IP networks and/or substation LANs using high speed switched Ethernet to obtain the necessary response times of < 4ms for protective relaying. Other mappings have been proposed but are not yet standardized as is the case of the ACSI-CORBA mapping.

Standard Documents

IEC 61850 consists of the following parts detailed in separate IEC 61850 standard documents

  • IEC61850-1: Introduction and overview
  • IEC61850-2: Glossary
  • IEC61850-3: General requirements
  • IEC61850-4: System and project management
  • IEC61850-5: Communication requirements for functions and device models
  • IEC61850-6: Configuration description language for communication in electrical substations related to IEDs
  • IEC61850-7: Basic communication structure for substation and feeder equipment
    • IEC61850-7-1: Principles and models
    • IEC61850-7-2: Abstract communication service interface (ACSI)
    • IEC61850-7-3: Common data classes
    • IEC61850-7-4: Compatible logical node classes and data classes
  • IEC61850-8: Specific communication service mapping (SCSM)
    • IEC61850-8-1: Mappings to MMS (ISO/IEC9506-1 and ISO/IEC 9506-2)
  • IEC61850-9: Specific communication service mapping (SCSM)
    • IEC61850-9-1: Sampled values over serial unidirectional multidrop point to point link
    • IEC61850-9-2: Sampled values over ISO/IEC 8802-3
  • IEC61850-10: Conformance testing

History

Prior to IEC-61850, there were multiple protocols involved in a substation which include many proprietary protocols with custom communication links. So it had become necessary to make a complete protocol which suits for a complete substation so that all the devices from different vendors can interoperate. For achieving this goal about 60 experts from different countries worked in three IEC working groups from 1995. They responded to all the concerns and objectives and created future-proof standard for substation communications which is known as IEC 61850. The objectives that set for the making the standard were:

  1. A single protocol for complete substation considering modeling of different data required for substation.
  2. Definition of basic services required to transfer data so that the entire mapping to communication protocol can be made future proof.
  3. Promotion of high interoperability between systems from different vendors.
  4. A common method/format for storing complete data.
  5. Define complete testing required for the equipments which confirms to the standard.

IEC 61850 Features

IEC 61850 features include:

  1. Data Modeling -- Complete functionality of the substation is modelled into different standard logical nodes which can be grouped under different logical devices. There are logical nodes for data/functions related to the logical device (LLN0) and physical device (LPHD).
  2. Reporting Schemes -- There are various reporting schemes (BRCB & URCB) for reporting data from server through a server-client relationship which can be triggered based on pre-defined trigger conditions.
  3. Fast Transfer of events -- Generic Substation Event (GSE) are defined for fast transfer of event data for a peer-to-peer communication mode. This is again subdivided into GOOSE & GSSE
  4. Setting Groups -- The setting group control Blocks (SGCB) are defined to handle the setting groups so that user can switch to any active group according to the requirement.
  5. Sampled Data Transfer -- Schemes are also defined to handle transfer of sampled values using Sampled Value Control blocks (SVCB)
  6. Commands -- Various command types are also supported by IEC 61850 which include direct & SBO commands with normal and enhanced securities.
  7. Data Storage-- SCL(Substation Configuration Language) is defined for complete storage of configured data of the substation in a specific format.

IEC 61850 - Key Developments

  1. IEC 61850-7-410 Ed.1 approved as International Standard -- IEC 61850-7-410 Ed.1 Communication networks and systems for power utility automation - Part 7-410: Hydroelectric Power Plants - Communication for monitoring and control.
  2. Mapping of IEC 61850-7-3 to IEC 60870-5 and DNP3 -- Mapping of IEC 61850-7-3 common data classes to messages in IEC 60870-5-10x, DNP3in IEC 61400-25-4 is underway in IEC TC 57 WG 10 Task Force "104 mapping". The result will be published as IEC 61850-80-1

Literature

  • PRAXIS PROFILINE Special edition: IEC 61850 - Generating Tomorrow’s Electricity [1]

See also

External links

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