The SEL-751A Feeder Protection Relay is the right solution for industrial and utility feeder protection, with flexible I/O options, easy mounting, and fast settings.
The SEL-751A provides complete feeder protection, with overcurrent, overvoltage, undervoltage, and frequency elements. Easily upgrade protection without cutting or drilling existing cutouts with a small form factor and multiple mounting adapters. Quickly integrate into serial- or Ethernet-based communications with IEC 61850, Mirrored Bits communications, and other protocols.
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 ATEX- and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.
The 2 × 16 character LCD provides navigation, relay control, data, and diagnostics via default messages or up to 32 customizable display messages
Programmable front-panel LEDs with user-configurable labels alert operators to faulted phases and element operation
Programmable operator pushbuttons with user-configurable labels allow front-panel customization
A wide variety of communications protocols and media provide flexibility to communicate with other devices and control systems
Power supply options include 24–48 Vdc or 110–250 Vdc/110–240 Vac
The optional fiber-optic serial port provides quick and easy engineering access
Card slots include positions for optional I/O, a voltage input card, or an arc-flash detection card with sensors that help improve safety and prevent damage
Phase current and optional phase voltage inputs are on one card, freeing up space for additional SELect™ I/O card options
Complete Feeder Protection
Maximize control scheme flexibility using time- and instantaneous-overcurrent, overvoltage, undervoltage, and frequency elements with breaker failure protection for one three-pole breaker.
Optional Protection Features
Use the SEL-751A with one of the voltage input options to provide over- and underfrequency, rate-of-change-of-frequency, and over- and undervoltage protection as well as synchronism check, dc station battery monitoring, arc-flash detection, and power and demand metering.
Use the four programmable pushbuttons on the front panel for quick, personalized control.
Choose from Ethernet or serial communications and several protocols, including Mirrored Bits communications and IEC 61850. Pick multiple sessions of Modbus TCP, Modbus Serial, DNP3 LAN/WAN, or DNP3 serial for custom configuration of your applications.
Expanded SELogic Control Equations
Use math and logic combinations of analog and digital values for customized applications. Adapt system control based on prefault conditions. Scale analog values and latch momentary inputs for SCADA retrieval.
Match various reclosing practices using the programmable four-shot recloser with optional synchronism check.
Trust the industry’s widest ambient operating temperature range, –40° to +85°C (–40° to +185°F). The SEL-751A withstands vibration, electrical surges, fast transients, and extreme temperatures, meeting stringent industry standards. A conformal-coating option for the printed circuit boards provides an additional barrier to airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture. In addition, the SEL-751A is ATEX- and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.
Alert key personnel to problems automatically with direct SEL-3010 Event Messenger support.
Easily install into existing locations using available retrofit kits and mounting adapters, with no cutting or drilling.
Choose from many installation and integration options with a small form factor and slide-in expansion cards.
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