Enhance IEC 61850 Solution Performance With IEC 61869-9

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Build scalable station bus and process bus systems, tailored to your needs, by using SEL devices—now compliant with IEC 61869-9.
Many SEL-400 series relays now comply with the IEC 61869-9 communications standard, which allows for customized Sampled Values (SV) data streams. SEL relays that comply with the IEC 61869-9 standard enable you to optimize your Ethernet network’s bandwidth and improve performance by configuring SV packets to fit your application.

Build Reliable IEC 61850-Compliant Systems With SEL Devices

SEL provides the devices you need to build standards-compliant, scalable digital secondary systems with advanced performance and resilience.Our IEC 61869-9-compliant SEL-400 series relays enhance these solutions in several ways. The customized SV streams enabled by IEC 61869-9 decrease network load by 20 percent compared to IEC 61850-9-2LE that is used for typical applications. For instance, instead of the 4 currents and 4 voltages per packet previously required by IEC 61850-9-2, you can configure each SV packet to transmit 18 current and 6 voltage values for transformer applications. The Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy Protocol (HSR) add resiliency by enabling protective devices to continue operating if one of the network connections goes down. Using acSELerator Architect SEL-5032 Software, you can make device commissioning and system design faster, simpler, and more scalable.
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  1. Flexible Server ModelArchitect helps you customize your IEC 61850 system model—making the design process faster, simpler, and more scalable.
  2. Precision Time Protocol (PTP)The SEL-2488 Satellite-Synchronized Network Clock uses PTP to distribute precise time, enabling submicrosecond time synchronization for reliable protection and control.
  3. IEC 61850 Edition 2.1This update to the IEC 61850 standard brings improvements to GOOSE messaging and Manufacturing Message Specification (MMS) for increased  interoperability.
  4. HSR and PRP*These redundancy protocols improve the reliability and availability of process bus and station bus communications.
  5. IEC 61869-9A flexible message structure for SV streams decreases network load and improves process bus performance.
*The system diagram shows a PRP implementation.

Digital Secondary System Components

Digital secondary systems (also called digital substations) that comply with IEC 61850 are comprised of two communications segments, each using Ethernet over fiber: the process bus and station bus. The process bus transfers SV data streams and other communications between devices in the substation yard and protective relays in the control house. The station bus facilitates substation monitoring, automation, SCADA communications, secure engineering access, local HMIs, and more.
The advanced tools in Architect make it easy to configure your SEL-400 series relays. By leveraging the flexible server model supported in IEC 61850 Edition 2.1, you can use the tools to streamline the system design process, enabling you to create templates for substation designs throughout your system.See Architect 
SEL software-defined networking (SDN) switches—purpose-engineered for operational technology (OT) applications, such as process bus and station bus networks—provide superior cybersecurity and performance.See Ethernet Switches 
SEL merging units are installed next to primary equipment. They convert analog measurements to SV data, send the data to subscriber relays, and use GOOSE messages to initiate control actions and exchange information with other relays. They also provide local protection for backup in case of a communications loss.See SEL Merging Units 
Subscriber relays perform protective functions and other control actions based on the data streams they subscribe to, sending control signals to other relays via GOOSE or MMS messages. SEL devices provide advanced monitoring data to help increase situational awareness of your SV system.See SV Subscriber Relays 
Satellite-synchronized network clocks ensure that process bus data are time-aligned, enabling SV subscriber relays to use coherent data for protection and control.See Satellite Clocks 
Partner with our experienced engineers to create an IEC 61850-based digital secondary system tailored to achieve your operational goals.