SEL SEL-751A Feeder Protection Relay

SEL-751A

Feeder Protection Relay

SEL recommends selecting the SEL-751 Feeder Protection Relay in place of the SEL-751A.

The SEL-751 supports additional protection and communications options, such as fault location, high-impedance fault detection, EtherNet/IP, and an integrated web server.

It is also available with a color touchscreen display.

Feeder Protection

Protect radial and looped distribution circuits with comprehensive protection capabilities, including time-overcurrent, autoreclosing, over-/undervoltage, frequency, and much more.

Arc-Flash Mitigation

Improve safety for personnel with optional arc-flash detection capabilities.

The SEL-751A offers combined light and high-speed overcurrent detection for arc-flash events. This combination provides the ideal solution for speed and security.

Automation and Control

Apply the SEL-751A on feeders and provide protection, automation, and control capabilities all in one package.

SELogic control equations support many automated applications without the need for additional automation controllers.

The configurable front-panel buttons can replace conventional panel controls and simplify overall applications and wiring.

Event Analysis

Conduct post event analysis more efficiently with the detailed event records that are available in the SEL-751A.

Combine oscillographic and digital information to find root cause. Add a satellite-synchronized time source, like the SEL-2401 or SEL-2407 Satellite-Synchronized Clocks, for convenient alignment of event information from multiple devices.

Situational Awareness

Improve situational awareness and asset utilization with IEEE C37.118 synchrophasor measurement.

Aggregate synchrophasor information from across your system to understand system trends, make decisions based on state measurement rather than state estimation, and aid in post event analysis.

Reliable Protection in Harsh Environments

The SEL-751A operates in extreme conditions, with an operating temperature of –40° to +85°C (–40° to +185°F), and it is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions

. In addition, the SEL-751A is Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.

Flexible I/O for Local Control and System Applications

The base system includes three digital outputs and two digital inputs. There are three card slots for optional SELect I/O cards, including the following:

Four arc-flash sensor inputs

Four digital inputs (DI) and four digital outputs (DO)

Four DI and four fast, high-current interrupting DO

Four DO, three DI, and one analog output (AO)

Four analog inputs (AI) and four AO

Eight AI for dc process values

Eight DI

Three ac voltage inputs

Ten RTD inputs

Integrated Communications

The SEL-751A offers many communications media and protocol options.

Versatile communications options provide fast integration into both new and existing applications.

Communications Media

Ethernet 10/100BASE-T

Ethernet 100BASE-FX

Single or dual Ethernet ports

EIA-232 serial

EIA-485 serial

Fiber-optic serial multimode ST

Communications Protocols

Mirrored Bits communications

IEC 61850

DNP3 LAN/WAN

DNP3 Serial

Modbus TCP

Modbus RTU

Telnet

FTP

IEEE C37.118 Synchrophasors

Retrofit Replacement Kits

Replace existing feeder protection with the SEL-751A and the applicable mounting kits.

These kits provide the parts needed to easily replace many older feeder relays with the SEL-751A.