SEL-451 Protection, Automation, and Control System

Products for Protection, Monitoring, Control, Automation, and Metering

SEL-451

Protection, Automation, and Control System

The SEL-451 has the speed, power, and flexibility to combine the control and protection of many substation devices into one economical system.

Maximize the Capability of Substation Equipment
Fully load equipment by monitoring power, including thermal or rolling interval demand as well as peak demand on positive-, negative-, and zero-sequence current. Use the full capacity of the equipment while maintaining SEL quality protection.
Advanced Visualization Tools
The SEL-451 offers a configurable human-machine interface (HMI) to allow for easy integration into your application or operating standards. HMI tools include custom metering and status displays, direct pushbutton access, critical information alarms in chronological order, rotating display, and timestamped sequential events recorder (SER) report.
Bay Control for Two Breakers
Complete two-breaker control and breaker failure complement the versatility of the SEL-451 programmable logic to meet your bay control needs. Easily control motor-operated switches, capacitor banks, and field I/O from the front panel or remotely. Use configurable labels to customize relay controls to match your application.
Communications
Download event reports in seconds, instead of minutes, using the optional Ethernet port with Telnet and FTP. Quickly move information with DNP3 LAN/WAN or IEC 61850 protocols.
Improve Operation With IEEE Synchrophasor Data
Give operators critical system information via serial or Ethernet communications. Install required substation protection, monitoring, and control using the SEL-451, and get a built-in phasor measurement unit at each substation.
High-Accuracy Timestamping
Time-tag binary COMTRADE event reports with real-time accuracy of better than 10 µs. View system state information at time of faults, or with timed triggers, across the entire system. Use system state information to validate system models and improve transfer limits and system stability.
Digital Fault Recording
Combine relaying reliability with true DFR functionality. The SEL-451 Relay's high-speed sampling (8 kHz) and COMTRADE output provide advanced oscillography. Use the ACSELERATOR® QuickSet SEL-5030 Software graphical user interface for harmonic analysis and easy event viewing.
Integrate Many Substation Devices Into One Powerful System Using the SEL-451.
Control cooling fans, motor-operated switches, or other equipment using the processing and I/O of the SEL-451. Hardware options let you expand I/O to 55 inputs and 24 outputs.
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.
ACSELERATOR QuickSet Software
Help speed relay applications by developing relay settings offline, programming SELOGIC control equations, and analyzing post-fault event reports.

Rack- or panel-mount, horizontal and vertical hardware packages.
Ethernet connection options for primary and standby connections
- 10/100BASE-T
- 10BASE-FL
- 100BASE-FX
DNP3 Level 2 Slave communications protocol.
One or two additional I/O boards with standard, high-interrupting or high-speed/high-interrupting outputs.
User-configurable labels for operator controls and target LEDs.
Connectorized^® hardware configuration.
Enhanced HMI with 24 target LEDs and 12 operator pushbuttons.
Independent breaker trip/close pushbuttons with status indication, including 24 additional input and 4 additional output contacts.
High-impedance fault detection using Arc Sense™ technology.
Conformal Coating—Protect equipment from harsh environments and airborne contaminants such as hydrogen sulfide, chlorine, salt, and moisture.
Learn more about conformal coating.

Apply overcurrent protection for primary and backup, and three-pole tripping schemes on subtransmission lines.
Make settings for up to four shots of automatic breaker reclosing for one or two circuit breakers, with synchronism and voltage checks to optimize system restoration.
Use the built-in fault locator to efficiently dispatch line inspection and repair personnel.
Operate power systems with maximum stable loading using real-time voltage and current synchrophasors.
Implement breaker failure logic for one or two circuit breakers.
Schedule as-needed circuit breaker maintenance and send alarms when the breaker monitor detects excess breaker contact wear.
Track average and last circuit breaker operating time. Alarm on slow circuit breaker.
Alarm for low-voltage conditions on one or two station batteries.
Use SEL-5601 Analytic Assistant Software to display oscillograms and vector diagrams to analyze event reports.
Detect downed conductors and high-impedance faults with patent-pending Arc Sense technology.

SEL provides options to help you efficiently and safely commission and test these relays.
	Streamline commissioning by using the SEL-4391 Data Courier™ to send and retrieve settings, gather event reports, and install enhancements.
	When access to the back of panels and cabinets is allowed, use a Connectorized^® version of this relay for fast installation and testing.
	Improve safety, save time, and reduce costs with SEL-4600 Series Test Blocks and Plugs. Use the SEL recommended standard block and plug configurations for SEL-451 relays.

SEL accessories simplify operation and enhance the flexibility of SEL products.

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-9510 Double Mount

Budgetary Retail, Quantity 1: $4,200
Fully Optioned Price: $9,960
(Prices displayed are for planning purposes and are subject to change. Contact your SEL sales representative today for a quote on configurations and quantities to meet your needs.)