Synchrophasor Products

Compact, precision-time device for limited space and high-accuracy timing to ±100 nanoseconds.

The SEL-2404 is a satellite-synchronized time source with a high-visibility display. Get precise time in harsh environments at a commercial price.

Apply the SEL-411L Relay for complete protection and control of any transmission line. The SEL-411L provides differential protection with both phase and sequence based operating elements for sensitivity and high-speed operation.

Protect transmission lines with high-speed distance and directional functions.

Quickly integrate bay control status and control for breakers and disconnect switches with full automation and protection in one device. With advanced synchrophasor measurement, the SEL-451 provides system stability awareness. Choose between Ethernet and serial communications ports with DNP3 and IEC 61850 protocols.

The SEL-487E provides comprehensive protection, metering, monitoring, and automation of power transformer applications with up to five 3-phase restraint current inputs, two 3-phase voltage inputs, and three independent neutral current inputs with restricted earth fault (REF) elements.

Simplify relay settings and reduce inventory with one relay for all your capacitor bank needs. The versatile SEL-487V protects and controls both grounded and ungrounded, single- and double-wye capacitor bank applications.

The SEL-351A Relay is for industrial and utility feeder protection. Provide wide-area system stability awareness with IEEE C37.118 synchrophasors. Simplify communications with built-in Ethernet. Protect system performance with high-accuracy metering, over- and underfrequency elements, and directional elements with SEL’s Best Choice Ground Directional Element^® logic.

The SEL-351 Relay has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional Mirrored Bits^® communications and power quality monitoring add flexibility to solutions. The SEL-351 is the protection standard for utility and industrial electrical systems around the world.

The SEL-351RS Kestrel is a lightweight, advanced recloser control with integrated logic, communications, and comprehensive protection for single-phase applications.  Convenient operator controls allow easy local access to metering and event data.
 

The SEL-351S Relay is for industrial and utility feeder protection. Provide wide-area system stability awareness with IEEE C37.118 synchrophasors. Simplify communications with built-in Ethernet. Large, easy-to-use operator controls and optional independent SafeLock^® trip/close pushbuttons enhance operation and simplify panels. Protect system performance with high-accuracy metering, over- and underfrequency elements, and directional elements with SEL’s Best Choice Ground Directional Element^® logic.

The SEL-351 Directional Overcurrent and Reclosing Relay is for industrial and utility feeder protection. Provide wide area system stability awareness with synchrophasors. Protect system performance with high accuracy metering, over- and underfrequency elements, and directional elements with SEL's Best Choice Ground Directional Element. Order the SEL-351 with additional I/O, Sag-Swell-Interrupt, and power protection elements for advanced applications.

Use the SEL-651R Advanced Recloser Control for your most demanding recloser applications. Plug-compatible replacement for most Kyle/Cooper FXA, FXB, Form 3, 3A, 4, 4A, 4C, 5 and 6 recloser controls. Built-in harmonic metering, Sag-Swell-Interrupt reporting help improve power quality.

Implement subtransmission or backup distance protection at a very low cost with the SEL-311A Relay.

Economical step distance protection using the SEL-311B Relay with four-shot reclosing and synchronism check. 

Apply the SEL-311C Relay for complete three-pole distance protection, monitoring, and control of transmission lines.

Use the SEL-311L Relay with integral four-zone distance backup for easy-to-apply, high-speed line protection.

The SEL-700G Relay is the right solution for utility and industrial generator protection, with an autosynchronizer, flexible I/O, and advanced communications. Apply the SEL-700G Relay for comprehensive primary and backup generator protection.

The SEL-2431 Voltage Regulator Control is compatible with most 32-step, single-phase voltage regulators manufactured in North America. Use various hinge and wiring kits to easily upgrade existing controls without removing the regulator from service. Quickly integrate the SEL-2431 into existing communications schemes using EIA-232, EIA-485, fiber-optic ST^®, or fiber-optic V-pin connectors.

The SEL-734 Meter exceeds ANSI and IEC Class 0.2 accuracy with four-quadrant energy and demand metering. Advanced load profile trending compatible with MV-90^®, DNP3, and Modbus^® protocols ensures integration with practically any billing system.

The SEL-751 Feeder Protection Relay is ideal for directional overcurrent, fault location, arc-flash detection, and high-impedance fault detection applications. Flexible I/O options, easy mounting, and fast settings make the SEL-751 the right solution for industrial and utility feeder protection.

The SEL-751A Relay is for industrial and utility feeder protection, with flexible I/O options, easy retrofit, and fast setup and configuration. The SEL-751A provides complete feeder protection with overcurrent, voltage, and frequency elements.

The SEL-3373 PDC provides phasor data concentration and local archiving for up to 40 phasor measurement units (PMUs). It is designed to operate reliably in harsh substation environments and offers several innovative features.

Combine the power of synchrophasor message processing with flexible programmable logic for wide-area protection and control applications. The Synchrophasor Vector Processor (SVP), the first real-time synchrophasor programmable logic controller, collects synchrophasor messages from relays and phasor measurement units (PMUs). The SVP time-aligns incoming messages, processes them with an internal logic engine, and sends control commands to external devices to perform user-defined actions. Additionally, the SVP can send calculated or derived data to devices such as other SVPs, phasor data concentrators (PDCs), and monitoring systems.

synchroWAVe PDC provides phasor data concentration and archiving for more than 200 phasor measurement units.

The SEL ICON, with other SEL products, provides end-to-end solutions, including wide-area control using synchrophasors, time distribution, and transmission line protection.

The substation-hardened SEL-3620 secures all Ethernet communications between your private networks and interoperates with existing business IT and control systems over an Internet Protocol Security (IPsec) virtual private network (VPN). The SEL-3620 protects your private network from malicious traffic with an integrated firewall and strong authentication access control. Apply the SEL-3620 to satisfy your business requirements for securing routable protocols or data crossing the electronic security perimeter (ESP). The SEL-3620 provides up to 16 VPN network connections on three Ethernet ports.

The SEL-3031 Serial Radio Transceiver combines three serial data ports in one radio, allowing up to three different connections and protocols to operate simultaneously. The radio transmits data in the license-free, 900 MHz ISM band, providing an economical communications path and backup communications system.