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 in Harsh Environments—Rely on the SEL-751A for protection and control applications, even in harsh and hazardous environments. The SEL-751A is designed and tested to meet and exceed utility and industrial requirements. An operating temperature range of –40° to +85°C (–40° to +185°F), Class 1, Zone 2 approval, and optional conformal coating mean this relay will provide years of reliable service.
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.
Rely on the industry’s widest ambient temperature operating range, –40° to +85°C (–40° to +185°F).
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.
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:
The SEL-751A offers many communications media and protocol options. Versatile communications options provide fast integration into both new and existing applications.
Find other mounting options with the SEL Mounting Selector.
Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
Learn more about conformal coating.