Key Takeaways :
IEC 61850 is an international standard for substation automation that defines communication protocols enabling interoperability between protection relays, IEDs, merging units, and SCADA systems in digital substations. HSR (High-availability Seamless Redundancy, IEC 62439-3) and PRP (Parallel Redundancy Protocol, IEC 62439-3) are the two zero-recovery-time network redundancy protocols most widely adopted in IEC 61850 deployments.
- IEC 61850 digital substations rely on process bus and station bus networks for protection, control, and monitoring.
- HSR and PRP provide seamless redundancy for substation communications, supporting high network availability in different deployment scenarios.
- ORing industrial Ethernet switches help build secure and reliable digital substations with rugged design, advanced redundancy, and centralized management.
This guide covers the design and deployment of IEC 61850-compliant substation communication networks using HSR (High-availability Seamless Redundancy) and PRP (Parallel Redundancy Protocol) architectures. It addresses process bus and station bus network design, redundancy strategy selection, cybersecurity considerations based on IEC 62443 and IEC 62351, and the application of ORing industrial Ethernet switches in modern digital substation environments. Intended for protection engineers, substation automation specialists, and network architects working on utility-grade communication infrastructure.
What Is IEC 61850 and How Does Digital Substation Architecture Work?
IEC 61850 defines standardized communications for substation automation systems, enabling interoperability between protection relays, IEDs, SCADA platforms, and monitoring systems. Digital substations typically consist of two primary networks:
- Process Bus – transports sampled values and protection messaging from merging units and field devices.
- Station Bus – connects protection relays, gateways, and SCADA systems within the control network.
How Does HSR (High-availability Seamless Redundancy) Work in Substations?
HSR networks create ring-based topologies where each node forwards traffic in both directions. Frames are duplicated and transmitted along both paths to ensure that communication continues even if a network link fails.
- Zero recovery time for network failures
- Ring topology connecting protection relays and IEDs
- Commonly used in bay-level protection networks
- No need for spanning tree protocols
How Does PRP (Parallel Redundancy Protocol) Work in Substations?
PRP networks use two independent Ethernet networks operating in parallel. Devices transmit duplicate frames across both networks, ensuring seamless communication if either network fails.
- Two fully independent LAN networks
- Zero switchover time
- Ideal for station bus and control networks
- Supports integration with non-PRP devices via RedBoxes
What Should Engineers Consider When Designing an IEC 61850 Substation Network?
- Define clear separation between process bus and station bus networks.
- Deploy redundant core switching infrastructure for SCADA and station control systems.
- Use HSR rings for protection relay communication where deterministic recovery is required.
- Use PRP architectures for station-level networks requiring extremely high availability.
- Segment networks using VLANs and Layer 3 routing to improve security and performance.
How Should Cybersecurity Be Addressed in IEC 61850 Digital Substations?
Substation communication networks should be designed to support modern cybersecurity frameworks including IEC 62351-6 (GOOSE and sampled values authentication), IEC 62443-3-3 (system security requirements), and IEC 62443-4-2 (component-level security). Recommended practices include network segmentation, secure remote access, centralized monitoring, and encrypted management communications.
Which ORing Switches Are Suitable for IEC 61850 Digital Substations?
ORing industrial Ethernet switches provide the rugged design, high availability, and advanced redundancy features required for modern substation automation networks.
- Support for IEC 61850 digital substation architectures
- HSR / PRP redundancy support (IEC 62439-3)
- Rugged hardware compliant with IEC 61850-3 and IEEE 1613
- Advanced Layer 3 routing and network segmentation
- Centralized management using Open Vision Pro
Frequently Asked Questions
1. Which ORing switches support HSR and PRP in IEC 61850 digital substations?
ORing supports HSR and PRP in several industrial Ethernet switch models, including the RGS-PR9000, RGS-P9000, and IGS-P9084GPI. These switches are designed for digital substation applications that require seamless redundancy and high network availability.
2. What is the difference between HSR and PRP in substation networks?
HSR uses a ring topology where each node forwards duplicated traffic in both directions, while PRP uses two independent LANs that transmit duplicate frames at the same time. Both provide zero recovery time, but HSR is often used in bay-level or process-level networks, while PRP is commonly chosen for station bus and control system deployments.
3. Which ORing model is suitable for IEC 61850 HSR or PRP deployment?
The best model depends on network size, installation method, and the role of the switch in the substation architecture. The RGS-PR9000 and RGS-P9000 are generally suitable for high-performance station bus or backbone applications, while the IGS-P9084GPI is a strong option for compact or distributed field deployments that still require HSR/PRP support.
4. Can ORing RGS-PR9000, RGS-P9000, and IGS-P9084GPI be used in IEC 61850 substations?
Yes. These three models are suitable for IEC 61850 digital substation environments that require high availability and seamless network redundancy. They are designed for industrial networking applications where reliable communication is critical for protection relays, IEDs, gateways, and SCADA systems.
5. Why are HSR and PRP important in digital substations?
HSR and PRP are important because substation communication networks must continue operating even when a link or network path fails. By duplicating traffic and removing recovery delay, these redundancy protocols help maintain uninterrupted communications for critical protection and automation traffic.
6. How do ORing switches help improve cybersecurity in substations?
ORing industrial Ethernet switches support secure substation design through network segmentation, advanced management, and resilient communication architecture. When deployed with cybersecurity frameworks such as IEC 62351 and IEC 62443, models like the RGS-PR9000, RGS-P9000, and IGS-P9084GPI help build more secure and manageable utility communication networks.
7. What should engineers consider when choosing between RGS-PR9000, RGS-P9000, and IGS-P9084GPI?
Engineers should compare deployment location, available space, port requirements, network role, and whether the switch will be installed in a station bus, process bus, or distributed field cabinet. The right choice depends on the balance between performance, topology requirements, and installation flexibility.
