IEC TR 61850-90-12:2020 PDF

Overview

IEC TR 61850-90-12:2020 - "Communication networks and systems for power utility automation – Part 90-12: Wide area network engineering guidelines" - is a Technical Report that provides engineering guidance for designing, specifying, commissioning and testing wide area networks (WANs) used in power utility automation based on IEC 61850. Targeted at data network engineers, system integrators and utility automation teams, the second edition (2020) updates use cases, wireless/PLC options, radio performance, packet-switched migration and adds MPLS mapping for teleprotection.

Key topics and technical requirements

• Scope of communication: substation-to-substation, substation-to-control centre and control centre-to-control centre WAN links supporting protection, control and monitoring.
• Critical IEC 61850 services: engineering and transport considerations for GOOSE, sampled measured values (SMV) and multicast transfer of large volumes of synchrophasor data.
• Performance metrics: latency, jitter, latency symmetry, propagation and residence delays, recovery delay, and time accuracy classes.
• Quality of Service (QoS): traffic classification, prioritization and traffic management to meet protection and control timing constraints.
• Redundancy & reliability: topology options, redundancy principles, availability, single points of failure and maintainability for mission-critical WANs.
• Transport technologies: guidance across Layer 1–4 technologies (fibre, radio, PLC, Ethernet, SDH/SONET, MPLS, IP), tunnelling and VPNs applicable to utility WANs.
• Clock synchronization & time accuracy: requirements for time-aligned measurements and deterministic behavior for protection/WAMS.
• Security & maintenance: recommendations for secure WAN design, component selection, testing and lifecycle maintenance.
• Use cases: practical examples including teleprotection, WAMS/WAMPAC, SCADA/telecontrol, distribution automation, condition monitoring and inter-control-centre communication.

Practical applications and users

• Utilities planning or migrating WANs for IEC 61850-based protection, control and monitoring.
• Network architects and data network engineers specifying link-level and end-to-end QoS, latency budgets and redundancy.
• System integrators and vendors selecting equipment, designing VPN/MPLS overlays, and implementing multicast for SMV/PMU streams.
• Protection engineers validating teleprotection and time-critical data flows; test labs defining acceptance tests based on the TR’s metrics.
• Project managers using use cases and templates to write procurement specifications and acceptance tests.

Related standards

• IEC 61850 family (substation automation)
• IEC 61850-5 (substation WAN interfaces referenced)
• Other referenced documents and standards for measurement and synchrophasor transport (e.g., C37.118 is discussed in the report)

Keywords: IEC TR 61850-90-12 2020, IEC 61850 WAN engineering guidelines, GOOSE, SMV, synchrophasor, teleprotection, MPLS, QoS, latency, redundancy, wide area network utilities.