SEL-451

Protection, Automation, and Bay Control System

The SEL-451 is a protection relay that integrates advanced feeder protection, automation, and complete substation bay control into a single, economical system. It provides comprehensive protection for distribution systems alongside full control over breakers and disconnect switches. Additionally, it supports modern digital substation technologies such as TiDL and SV, making it ideal for system modernization.

Key Features

High-Impedance Fault (HIF) Detection

Uses Arc Sense technology (AST) to effectively detect low-current ground faults, such as downed conductors on poorly conductive surfaces like earth or concrete.
Synchronism Check

Ensures safe breaker closing by verifying the phase, magnitude, and frequency across the breaker, while incorporating breaker close time into the decision.
Bay Control and Reclosing

Provides integrated control for up to two breakers and supports programmable auto-reclosing for one or two breakers.
High-Speed Breaker Failure Detection

Quickly identifies breaker failures to maintain system stability and prevent secondary damage.
Fault Locator

Pinpoints fault locations to help line crews respond quickly and minimize outage durations.
Digital Process Bus Technology

Supports SEL TiDL and Sampled Values (SV) technologies, replacing copper cabling with fiber optics to enhance safety and reduce modernization costs.
Synchrophasors

Provides real-time measurement data according to the IEEE C37.118 standard for wide-area monitoring and precise analysis of the power system.

Front-Panel User Interface

Equipped with an LCD display, programmable target LEDs, and trip/close pushbuttons for intuitive local operation and status monitoring.
Versatile Communication Interfaces

Supports flexible network configurations with multiple serial ports and Ethernet cards, including 1 Gbps and 100 Mbps SFP ports.
Extensive Protocol Support

Compatible with various industry-standard protocols, including IEC 61850 Edition 2.1, DNP3, EtherNet/IP, PRP, and PTPv2, ensuring easy integration with existing systems.
Precise Time Synchronization

Maintains microsecond-level accuracy using IRIG-B time inputs as well as PTPv2 (supporting IEEE C37.238 and IEC 61850-9-3 profiles).
Advanced Configuration and Logic Management

Utilizes ACSELERATOR QuickSet and Grid Configurator software for visual logic editing and efficient settings management.
Flexible Hardware Options

Offers 4U or 5U chassis sizes, vertical or horizontal mounting, and various I/O board expansion options for customized installation.