IEC 61850-8-2:2018

Overview

IEC 61850-8-2:2018 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies a method for exchanging data between power utility automation systems using the Extensible Messaging and Presence Protocol (XMPP). This part of the IEC 61850 series focuses on the Specific Communication Service Mapping (SCSM) that maps communication services defined in IEC 61850-7-2, particularly client/server and time synchronization services, to XMPP for seamless interoperability across diverse networks, including public networks.

The standard plays a crucial role in enabling real-time, secure, and reliable data exchange in smart grids and power utility automation systems by leveraging established internet protocols such as XMPP. It also addresses end-to-end security and defines XML payloads necessary for the communication of Abstract Communication Service Interface (ACSI) services.

Key Topics

• Client/Server Service Mapping
  IEC 61850-8-2 maps ACSI objects and services into XML messages transmitted via the XMPP protocol. It describes how client/server services, including those related to GOOSE (Generic Object Oriented Substation Events) and SMV (Sampled Measured Values) models, are efficiently encoded and exchanged.

• XMPP Protocol Usage
  Detailed guidelines cover which features of XMPP are utilized, how connections are established with Transport Layer Security (TLS) and Simple Authentication and Security Layer (SASL), stream compression, presence handling, and roster management. Extensions like XMPP PING (XEP 0199) and Stream Management (XEP 0198) are incorporated to enhance reliability.

• End-to-End Security
  The standard emphasizes secure communication through encryption and authentication mechanisms within the XMPP framework to protect critical power automation data from interception or tampering.

• XML Payload Structure
  XML Schema Definitions (XSD) and example messages are provided for each ACSI service, covering Logical Nodes, Data Objects, Data Attributes, and time synchronization. This ensures standardized and interoperable message formats for client/server communication.

• Time Synchronization Services
  Time sync services essential for synchronized operations in power systems are mapped to XMPP, supporting precise timing coordination critical for automation tasks.

• Implementation Agreements
  Specific agreements on how XMPP features and extensions should be implemented ensure consistent interoperability among devices and systems from different manufacturers.

Applications

• Power Utility Automation Systems
  Enables seamless, interoperable communication among Intelligent Electronic Devices (IEDs), substations, and control centers through XMPP-based messaging, facilitating automation, control, and monitoring.

• Smart Grid Communication
  Supports robust and secure information exchange over public and private networks, helping utilities integrate distributed energy resources and advanced grid management solutions.

• Remote Monitoring and Control
  Facilitates reliable client/server interactions for remote diagnostics, configuration, and fault management in electrical substations and distributed automation devices.

• Time-Synchronized Operations
  Provides mechanisms for precise time synchronization across networked devices, which is pivotal for protection schemes, automation processes, and data consistency.

Related Standards

• IEC 61850-7-2 – Defines the Abstract Communication Service Interface (ACSI) for power utility automation, serving as the base for service mapping in IEC 61850-8-2.

• IEC 61850-8-1 – Specifies communication service mappings to MMS (Manufacturing Message Specification), which complements the XMPP mapping for diverse communication requirements.

• XMPP Extensions (XEPs) – Protocol extensions such as XEP 0198 (Stream Management) and XEP 0199 (XMPP Ping) enhance the reliability and performance of XMPP communications as utilized in the standard.

• IEC 61850 Series – Comprehensive set of international standards covering communication networks and systems for power utility automation.

IEC 61850-8-2:2018 advances power utility communication by leveraging XMPP's scalability and security, providing a standardized approach for integrating and managing complex automation systems through interoperable client/server communication.