SEL-751

Feeder Protection Relay

The SEL-751 is a comprehensive feeder protection and control relay that integrates arc-flash detection. Designed for the protection, control, and monitoring of distribution lines, it is particularly well-suited for small enclosures or space-constrained environments. It supports modern sensor technologies such as Rogowski coils and low-power current transformers (LPCT), offering exceptional installation flexibility. It provides a robust solution to maximize power system stability for industrial facilities and public utilities.

Key Features

Ultra-Fast Arc-Flash Protection

Detects and clears arc-flash events in as fast as 2 ms, preventing personal injury and minimizing equipment damage during an accident.
Support for Modern Sensor Technology

In addition to traditional CTs/PTs, it supports Low-Energy Analog (LEA) voltage sensors, Rogowski coils, and Low-Power Current Transformer (LPCT) inputs for increased design flexibility.
Open-Phase and Broken-Conductor Detection

Utilizes phase discontinuity and broken-conductor detection logic to identify line faults before they escalate into ground faults or fire hazards.
Cold-Load Pickup

Ensures safe restoration by preventing nuisance tripping caused by transient currents when re-energizing a system after an extended outage.
Integrated Advanced Protection

Performs complete feeder protection with a suite of overcurrent, voltage, frequency, and power-based protection elements, along with directional control.
Enhanced Network Recovery

Supports the Rapid Spanning Tree Protocol (RSTP) to quickly recover communications via alternate paths in the event of a network failure.
Synchrophasors

Provides data according to the IEEE C37.118 standard to support wide-area monitoring and precise post-event analysis of the power grid.

5-Inch Color Touchscreen Display

Features a large color touchscreen HMI, allowing users to intuitively monitor bay screens, one-line diagrams, and metering values locally.
Extensive Communication Protocols

Supports various industry-standard protocols, including IEC 61850 Edition 2.1, DNP3, Modbus TCP/RTU, Telnet, FTP, EtherNet/IP, and PRP for easy system integration.
Multiple Power Supply Options

Offers support for ranges such as 110 – 250 Vdc / 110 – 240 Vac or 24 – 48 Vdc to match specific field installation environments.
Event Recording and Summaries

Provides detailed Sequential Events Recorder (SER) data and fault summary reports to facilitate rapid root-cause analysis after an event.