Coming soon

SEL-9L

Line Relay

The SEL-9L is a high-performance line protection relay based on SEL’s next-generation '9 Series' platform. While maintaining SEL's proven protection algorithms, it integrates flexible hardware and modern software technology optimized for contemporary substation environments. As a versatile platform that can be software-configured for Line, Feeder, or Transformer applications, this version specifically provides advanced line distance protection and high-speed tripping capabilities.

Key Features

High-Speed Computational Performance

Features a 10 kHz sampling rate and a 1 ms processing interval to ensure extremely fast and accurate response to faults.
Advanced Distance Protection

Includes highly reliable distance protection elements to precisely detect and clear line faults.
Flexible Hardware Configuration

Supports software-selectable 1 A/5 A CT inputs and a wide 24–250 V contact input range, allowing the device to adapt to various field conditions without hardware changes.
Powerful Communication

Equipped with 6 SFP ports supporting 1 Gbps and 100 Mbps Ethernet, IEEE C37.94, and Direct Peer-to-Peer protocols.
Trip Circuit Monitoring (TCM)

Provides three advanced high-speed outputs with integrated voltage, current, and trip circuit monitoring logic to maximize system reliability.
Standard Protocol Support

Supports IEC 61850 Edition 2.1, PRP (Parallel Redundancy Protocol), DNP3, and FTP for seamless system integration.
Enhanced Security

Implements TLS (Transport Layer Security) based secure communications to protect the device from external cyber threats.

7-Inch Color Touchscreen

Features a large color touchscreen HMI, allowing users to intuitively monitor metering values, status information, and one-line diagrams directly in the field.
Intuitive Status Indication

Includes 16 configurable tri-color LED targets and 10 programmable pushbuttons (with tri-color LEDs) for at-a-glance status monitoring.
Field-Replaceable SFPs

Allows users to instantly replace or reconfigure SFP transceivers in the field without powering down the device or removing it from the rack.
Safe Maintenance

Utilizes removable self-shorting terminal blocks, enabling safe wiring and testing without the risk of electric shock to personnel or damage to the relay.
Integrated Configuration Software

Leverages the SEL Grid Configurator, a next-generation tool that makes complex logic editing and settings management more intuitive and visual.
Battery Monitoring

Features an integrated battery monitoring function within the power supply to track the health of the station battery in real time.
USB-C Port

Includes a front-panel USB-C port for fast and easy connection to laptops for settings transfer and diagnostic data retrieval.

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