Products
Protective Relays
SEL relays detect faults and other abnormal conditions in electric power systems and initiate protective actions to maintain system stability and safety. They are used in a wide range of applications, from transmission and distribution to industrial power systems.
Time-Domain Protection
SEL time-domain technology provides ultra-high-speed protection of transmission lines by using traveling waves and incremental quantities.
Generator Protection
SEL generator protection systems offer comprehensive protection for generators of all sizes and types, including wind, hydro, pumped-storage hydro, steam turbine, and combustion gas turbine generators.
Transformer Protection
SEL transformer protection systems provide comprehensive protection and monitoring of power transformers across diverse applications.
Busbar Protection
SEL busbar protection systems offer flexible low- and high-impedance differential protection for busbars of various topologies and sizes.
Line Protection
SEL transmission line relays provide high-speed, subcycle line differential and multizone distance protection. Advanced fault-locating features enable rapid crew dispatch and faster service restoration.
Feeder Protection
SEL feeder relays enhance distribution system safety and reliability with comprehensive overcurrent, arc-flash, and backup protection. They are designed for utility, industrial, and commercial environments.
Recloser Controls
SEL recloser controls automatically isolate distribution faults and facilitate quick service restoration. Interoperable with a wide range of recloser vendors, they provide single- and three-phase tripping and assist wildfire mitigation with advanced fault detection features.
Capacitor Bank Protection
SEL capacitor bank protection systems offer complete protection for all types of capacitor configurations, providing safe and reliable operation.
Motor Protection
SEL motor protection systems provide complete protection for all types of motor faults. They are optimized for industrial and commercial applications.
Digital Secondary Systems
SEL digital secondary system (or digital substation) solutions improve personnel safety and reduce copper cabling by digitizing data close to the primary equipment and transmitting that data via fiber-optic cables.
Bay Controls
SEL bay control systems offer the flexibility to integrate substation bay control with high-speed protection for complete protection, control, and monitoring solutions.
Arc-Flash Detection
SEL arc-flash detection relays significantly reduce incident energy and trip times by combining light sensing with fast overcurrent protection. They coordinate easily with other devices in low- and medium-voltage systems across utility, industrial, and commercial sectors.
Downed-Conductor Detection
SEL downed-conductor detection technology identifies high-impedance faults in electric power systems, enhancing public safety and mitigating wildfire risk.
Configuration and Visualization Software
SEL software offers powerful tools for configuring protective relays, analyzing event reports, and visualizing other power system data.