SEL SEL-9L Line Relay

SEL-9L

Line Relay

Apply the SEL-9L Line Relay on lines of any length or voltage level. With features such as software-selectable contact input ranges and software-configurable small form-factor pluggable (SFP) transceivers—plus advanced cybersecurity as well as modern configuration software that simplifies commissioning and settings management—the SEL-9L provides a flexible, easy-to-use solution.

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 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 transmission lines with up to five zones of distance protection. Apply protection using phase or ground quadrilateral or mho elements.

Quickly clear faults and prevent potential equipment damage with subcycle operating times. The SEL-9L can be applied on lines of any length or voltage level.

Communications-Assisted Tripping

Provide communications-assisted protection for transmission 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.