SEL-751A Feeder Protection Relay
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.
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®, DeviceNet™, and other protocols.
- 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, over- and undervoltage, synchronism check, dc station battery monitoring, arc-flash detection, power and demand metering elements. - Convenient Controls
Use the four programmable pushbuttons on the front panel for quick, personalized control. - Easy Communications
Choose from Ethernet or serial communications and several protocols, including Mirrored Bits® 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. - Reclosing Control
Programmable four-shot recloser with optional synchronism check to match various reclosing practices. - Rugged Design
Rely on the industry’s widest ambient temperature operating range, –40° to +85°C (–40° to +185°F). - Automatic Notification
Alert key personnel to problems automatically with direct SEL-3010 Event Messenger support. - Easy Installation
Easily install into existing locations using available retrofit kits and mounting adapters, with no cutting or drilling. - Flexible Design
Choose from many installation and integration options with a small form factor and slide-in expansion cards.
- Customize front-panel pushbutton operation and LEDs, or use default breaker trip/close functions.
- Personalize LCD messages using event-driven display point settings.
- Create an integrated control system with a variety of I/O and communications options.
- Use the programmable control logic and integration features with a communications link for control and protection of remote substations.
- Use comprehensive reporting to understand events, schedule maintenance, detect unfavorable trends, modify loads, and satisfy information requirements of supervisory systems.
- Include RTD inputs as part of system integration or to bias protection.
- Remediate arc-flash hazards with arc-flash detection.
- Analyze overcurrent protection system performance using built-in Sequential Events Recorder (SER).
- Use acSELerator QuickSet® SEL-5030 or SEL-5010 Relay Assistant Software to manage your relay settings.
- Install protection where it is needed without special enclosures or ventilation systems. Class 1, Division 2 certification allows the SEL-751A in locations that may be adjacent to hazardous gasses, vapors, or liquids.
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 digital inputs (DI) and four fast, high-current interrupting digital outputs (DO)
- Four digital outputs (DO), three digital inputs (DI), and one analog output (AO)
- Four analog inputs (AI) and four analog outputs (AO)
- Eight analog inputs (AI) for dc process values
- Eight digital inputs (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
- IEC 61850
- DNP3 LAN/WAN
- DNP3 Serial
- Modbus TCP
- Modbus RTU
- DeviceNet™
- 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.
Find other mounting options with the SEL Mounting SELector.
Conformal Coating
Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
Learn more about conformal coating.
- Projection Mounting Collars available in 45 and 90 mm.
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Find other mounting options with the SEL Mounting SELector
- SEL accessories simplify operation and enhance the flexibility of SEL products.
- The SEL-4520 Arc-Flash Test Module provides a convenient way to test the operation of arc-flash detection relays installed in metal-clad and metal-enclosed switchgear.
- Add independent breaker control to any relay. The SEL-9510 Control Switch Module easily installs in panel or rack locations for independent local control and status indications.
SEL University Training
- APP 751A: Feeder Protection Relay
This course provides complete application training for the SEL-751A Feeder Protection Relay, an extremely versatile protective relay used worldwide for industrial and utility feeder protection.
- CBT 751A: Introduction to the SEL-751A Feeder Protection Relay
This self-paced training provides an introduction to feeder protection using the SEL-751A, including front-panel navigation and displays, acSELerator QuickSet® Software settings; relay logic, and arc-flash detection.
- COM 403: IEC 61850 Technology
- IEC 61850 was created to be an internationally standardized method of
communication and integration and to support systems built from
multivendor intelligent electronic devices (IEDs) that are networked to
perform protection, monitoring, automation, metering, and control
functions. In this communications fundamentals course, you will learn
about the components and protocols that make up the IEC 61850 standard.
During this one-day course, you will walk through the IEC 61850 planning
process and identify key network considerations. This course also
provides a concise introduction to the concepts that will be applied in
SYS 403.
- SYS 403: Practical IEC 61850 Application
- The international standard IEC 61850 was designed to standardize
communications and integration methods and to support systems built from
multivendor intelligent electronic devices (IEDs) that are networked to
perform protection, monitoring, automation, metering, and control
functions. SYS 403 is designed to be interactive and activity based.
During this course, you will configure and implement a realistic IEC
61850 communications and automation scheme. Each unit of this course
will guide you, step-by-step, through configuring this comprehensive
communications and automation scheme.
Flyers
Data Sheets
Design Template Guides
Guideform Specification
Installation Guides
Instruction Manuals
Instruction Sheets
Settings Sheets
Label Instruction
SELect Input Output Card Installation Instructions
Related Downloads
For file compatibility between the DeviceNet protocol and SEL relay firmware, refer to Appendix A of the product manual.
Certificates
Application Guides
Technical Papers
Miscellaneous
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