IEC 61850 from a Communications Perspective: SV/GOOSE vs. RSV/R-GOOSE

The modernization of electric utility substations via IEC 61850 has transformed protection, automation, and control communications. Key protocols-Sampled Values (SV) and GOOSE-use Layer 2 Ethernet multicast to deliver time-critical data within substation LANs. SV carries high-frequency analog measurements, while GOOSE transmits binary status messages with low latency and deterministic performance. However, these protocols are limited to non-routable Ethernet domains.
To support wide-area protection, distributed energy resources, and remote control, IEC 61850 introduced Routable GOOSE (R-GOOSE) and Routable Sampled Values (RSV). Encapsulating SV/GOOSE within IP/UDP enables transmission over IP/MPLS and Ethernet WAN infrastructures, facilitating inter-substation protection and centralized automation while meeting latency and availability requirements.
This evolution demands new network design considerations-traffic engineering, QoS, path symmetry, and fast recovery using technologies like multicast VPNs, Fast Reroute, and Segment Routing. Cybersecurity becomes critical, requiring IPsec, MACsec, and IEC 62351-based protections.
This presentation examines the communication differences and deployment impacts of SV/GOOSE vs. RSV/R-GOOSE, sharing validation results from lab testing over IP/MPLS and hybrid WANs. It highlights performance metrics, interoperability challenges, and best practices for scalable, secure, and standards-based IEC 61850 deployments supporting digital substations and the broader smart grid.