IEC 61850

IEC 61850
Title	IEC 61850
Status	International
Started	2000s
Organization	International Electrotechnical Commission
Domain	Power system automation

IEC 61850 IEC 61850 is an international International Electrotechnical Commission standard for communication and systems in power utility automation. It defines a standardized framework for substation automation, distributed energy resources, and protection, enabling interoperability among devices from different manufacturers. The standard integrates concepts from traditional protection schemes with modern Ethernet-based networking, and draws on related work from standards such as IEC 60870-5-104, DNP3, and IEEE 802.3.

Overview

IEC 61850 establishes a common data model, service definitions, and a configuration language to support functions in substations, control centers, and distributed generation. It targets interoperability among intelligent electronic devices (IEDs), relays, and control systems produced by vendors including ABB, Siemens, Schneider Electric, and GE Grid Solutions. The standard harmonizes with global institutions like CIGRÉ, IEEE, and ISO to align protection, automation, and telecontrol requirements with networking technologies such as MMS, GOOSE, and Sampled Values (SV). Major adopters include transmission operators such as National Grid, TenneT, RTE, and utilities in regions governed by EU directive frameworks and national regulators.

History and Development

Work on IEC 61850 began under technical committees of the International Electrotechnical Commission to address vendor-specific protocols and the growing need for standardized substation automation architecture. Early demonstrations involved collaborations among suppliers and utilities at pilot sites like testbeds supported by EPRI and research consortia including CEGB-era projects and later initiatives hosted by CIGRÉ working groups. Influential milestones included the adoption of Object Models and Abstract Communication Service Interface concepts from OSI model discussions and input from research centers such as ETH Zurich and Imperial College London. Subsequent revisions incorporated lessons from deployments in networks operated by PG&E, EDF, Tata Power, and transmission projects in Germany, Denmark, and Japan.

Scope and Architecture

The standard's scope covers substation automation, distributed energy resources, power quality, and remote control of grid assets. Architecture elements include logical devices, logical nodes, servers/clients, and a system hierarchy used by utilities like Southern Company and system integrators such as ABB Group. IEC 61850 prescribes information exchange patterns to support protection, control, monitoring, and metering functions across assets like circuit breakers, transformers, and phasor measurement units produced by Siemens Energy and Hitachi Energy. The modular architecture references models used in projects by Mitsubishi Electric and grid upgrades overseen by authorities such as Ofgem.

Communication Models and Protocols

Communication in IEC 61850 depends on protocols and mappings to enable real-time and configuration communications. Key protocols include MMS for configuration and control, GOOSE for high-priority event exchange, and Sampled Values (SV) for exchanging analogue measurements between merging units and protection relays. Transport and physical layers leverage Ethernet, IEEE 802.1Q VLANs, and IEEE 1588 Precision Time Protocol for time synchronization in deployments by National Instruments and telecom partners like Ericsson. Interoperability testing often involves test labs run by KEMA and certification by bodies such as IECEx-related entities.

Data Models and Logical Nodes

IEC 61850's data modeling uses object-oriented concepts to represent power system functions as logical nodes and data objects, facilitating mapping to vendor implementations from companies such as SEL and AREVA. Logical nodes model functions like protection (e.g., overcurrent), measurement, and control, with naming conventions aligned to utility practices seen at Enel and Duke Energy. The standard promotes a common semantics to reduce engineering time in projects delivered by system integrators like Hitachi ABB Power Grids and equipment manufacturers including Toshiba.

Configuration Language (SCL) and Tools

The Substation Configuration Language (SCL) is a key component, defined as an XML-based format to describe station, substation, communication, and IED configuration. SCL files facilitate engineering workflows involving tools from vendors like ETAP, Siemens PSS®, Schneider Electric EcoStruxure, and testing suites provided by OMICRON. Utilities such as Iberdrola and consultants from KEMA and DNV use SCL for project handover, device replacement, and lifecycle management conforming to asset management regimes like those of National Grid ESO.

Implementations and Applications

IEC 61850 finds applications in substation automation, protection schemes, renewable integration, and microgrid control in projects by ABB, Siemens Energy, GE Renewable Energy, and regional operators such as TenneT and California ISO. Implementations range from retrofit conversions in legacy substations managed by TransGrid to greenfield installations in HVDC links and offshore wind farms developed by Ørsted and Vestas. Research and pilot programs at institutions including TU Delft, RWTH Aachen University, and KTH Royal Institute of Technology explore extensions for wide-area monitoring, cyber-security interoperability with frameworks from ENISA, and integration with IEC standards like IEC 62351 for security.

Category:IEC standards