Apply the SEL-9L Line Relay on lines of any length or voltage level. The SEL-9L is an ideal choice for subtransmission applications. With features such as software-selectable contact input ranges and software-configurable, hot-swappable small form-factor pluggable (SFP) transceivers—plus advanced cybersecurity, single event upset error mitigation, and modern configuration software that simplifies commissioning and settings management—the SEL-9L sets a new standard for flexibility, reliability, and ease of use.
Learn more about the SEL 9 Series relay platform.
Preorders will be available soon.
Flexible Hardware and Firmware—Order the SEL-9L equipped for your application, and easily adapt it to future needs. Features such as a 48–250 V power supply, software-configurable SFP ports, and software-selectable contact input ranges let you adapt the relay to changes in substation systems and primary equipment. Integrated IEC 61869-9 publishing and IEC 61850 protocols enable fast and reliable communications for a variety of applications. Flexible firmware and the ability to mix and match communications-specific SFP transceivers make it easy to install future enhancements and add new functionality.
Advanced Trip Circuit Monitoring (CM)—Reduce operations and maintenance expenses with integrated advanced trip CM—available only from SEL. This feature allows the relay to validate output contact closure and differentiate output contact failure from other potential problems in the circuit, greatly reducing the frequency with which relays must be taken out of service and manually tested. The ability to validate correct operation with existing data in the relay also supports compliance efforts with reliability standards (for instance, NERC PRC-005 for North American utilities). Read our technical paper to see how it works.
Distance Protection—Protect critical subtransmission lines with up to five zones of distance protection. Apply protection using phase or ground quadrilateral or mho elements. Subcycle distance protection quickly clears faults and prevents potential equipment damage. The SEL-9L samples at 10 kHz with a 1-millisecond processing interval, ensuring a fast and accurate response. It can be applied on lines of any length or voltage level, and it is an ideal choice for subtransmission applications.
Communications-Assisted Tripping—Provide communications-assisted protection for subtransmission lines with preconfigured permissive overreaching transfer trip (POTT), directional comparison blocking (DCB), and intertripping direct transfer trip (DTT) schemes.
Simple Configuration and Commissioning—Reduce commissioning time, and more efficiently manage device settings with modern, intuitive configuration software. SEL Grid Configurator has a modern interface and customizable HMI screens that provide easy access to all the information needed to set, test, commission, and troubleshoot the SEL-9L. SEL Grid Configurator also features a spreadsheet-style settings editor, powerful protection visualization, comprehensive reporting, custom filters, and multiple-device settings management.
USB-C port
7-inch color touchscreen
16 configurable tricolor target LEDs
10 programmable pushbuttons with dual tricolor LEDs
3 advanced CM high-speed outputs with voltage, current, and trip CM logic
23 contact outputs
21 software-selectable 24–250 V contact inputs
2 Mirrored Bits ports
6 SFP ports
4 or 8 software-selectable 1 A or 5 A CTs with removable self-shorting terminal blocks
Line voltages with software-invertible polarities
Universal 48–250 V power supply with integrated battery monitor
Configurable SFP Ports
Each SEL-9L comes with one copper or fiber SFP transceiver installed. Configure the six available SFP ports with transceivers in various combinations to meet your needs. SFP transceivers can be replaced and reconfigured in the field without removing the relay from the rack or powering it down.
Flexible Communications and Networking
The SFP ports provide support for 1 Gbps Ethernet, 100 Mbps Ethernet, IEEE C37.94, and direct peer-to-peer protocols. Two dedicated RJ45 ports provide support for Mirrored Bits communications. In addition, the SEL-9L supports FTP, SNTP, DNP3 LAN/WAN, and the Parallel Redundancy Protocol (PRP) in accordance with IEC 62439-3, IEC 61850 Edition 2.1, Manufacturing Message Specification (MMS) file services, MMS authentication, and IEC 61869-9-2 Sampled Values publishing.
Advanced Hardware Features—Flexible and Safe
The SEL-9L is a 3U, 19-inch rack-mount unit. The universal power supply accepts 48–250 Vdc or 100–240 Vac. Depending on the base configuration ordered, the SEL-9L can have up to 21 binary outputs and 23 binary inputs with a software-selectable settings range of 24–250 Vdc or 0–240 Vac. CT inputs are software-selectable as 1 A or 5 A and require no changes to the hardware. Self-shorting terminal blocks can be removed from the relay without risking electrical shock to the technician or damage to the relay—making wiring and testing easier and safer.
Exceptional Protection
The SEL-9L includes a comprehensive set of protection elements:
Advanced Cybersecurity
Secure booting protects the relay during firmware upgrades, and role-based access control ensures that personnel can view and change only the data and settings they’re authorized to see.
The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.