Overview
IEC 61850-9-2:2011/AMD1:2020 is an amendment to the IEC 61850-9-2 international standard, focused on communication networks and systems for power utility automation. Specifically, it addresses the mapping of sampled values (SVs) over ISO/IEC/IEEE 8802-3, commonly known as Ethernet. The amendment brings updates and clarifications to the protocols, data structures, profile conformance, multicast addressing, synchronization mechanisms, and compatibility rules-ensuring enhanced interoperability, security, and network efficiency for modern digital substations and power automation systems.
The IEC 61850 series is essential in facilitating reliable, standardized information exchange between devices and systems within electrical substations, improving grid automation, operational efficiency, and future-proofing against evolving utility requirements.
Key Topics
1. Sampled Values Communication
- Stipulates improved mapping of sampled values, streamlining multicast communication and deprecating unicast SV frames for interoperability.
- Updates to the structure and encoding of SV messages, including application of VLAN tags and IEEE 802.1Q priority tagging to enhance the separation of critical data flows.
2. Protocol and Stack Revisions
- Aligns with major protocols such as ISO/IEC/IEEE 8802-3 (Ethernet), implementing parallel redundancy (PRP) and high-availability seamless ring (HSR) options for increased network reliability.
- Introduces updates for security integration using IEC 62351-6, supporting secure SV transmissions.
3. Synchronization Enhancements
- Recommends the use of Precision Time Protocol (PTP) per IEC 61588:2009 and IEC/IEEE 61850-9-3 for accurate time synchronization across devices, which is critical for digital substations.
4. Multicast Addressing
- Details recommended multicast Ethernet address ranges for SV data, improving filtering and network segmentation according to the latest IEC guidelines.
5. Data Structure and Encoding
- Defines ASN.1 encoding and specifies presentation layer rules for various data types, ensuring consistent and reliable data handling within devices.
6. Compatibility and Conformance
- Outlines rules for backward and forward compatibility with previous versions of IEC 61850-9-2, and specifies conformance requirements to support standardized integration and system upgrades.
Applications
IEC 61850-9-2:2011/AMD1:2020 is widely applicable in:
- Digital Substations: Facilitates efficient, secure exchange of digitized analog measurements (sampled values) between merging units, protective relays, and other IEDs over Ethernet networks.
- Protection and Control Systems: Supports time-critical communications required for high-speed protection schemes, metering, and monitoring.
- Smart Grid Automation: Enables integration of advanced measurement and control platforms, supporting grid modernization and interoperability.
- Network Design: Guidance on redundancy (PRP, HSR) and VLAN deployment enables engineers to design robust, resilient automation networks.
- Device Conformance Testing: Ensures new equipment can be tested for compliance with standardized SV communication, supporting smoother procurement and deployment cycles.
Related Standards
For a comprehensive approach to power utility automation communication, the following related standards should be considered:
- IEC 61850-8-1: Communication networks and systems for power utility automation - mapping to MMS for client/server services.
- IEC/IEEE 61850-9-3: Precision Time Protocol (PTP) Profile for Power Utility Automation, for robust time synchronization.
- IEC 61588:2009: Precision clock synchronization protocol for networked measurement and control systems (PTP).
- IEC 62351-6: Security for IEC 61850 protocols, especially regarding SV message integrity and confidentiality.
- IEC 62439-3: Defines redundancy protocols like PRP and HSR for high-availability network operation.
- ISO/IEC/IEEE 8802-3: Standard for Ethernet, forming the basis of network transport for SV messages.
By adhering to IEC 61850-9-2:2011/AMD1:2020 and its related standards, utilities and equipment manufacturers can ensure seamless, secure communication in power automation, supporting both current and future smart grid initiatives.
