Protect asynchronous (induction) and synchronous motors with one SEL-710-5 Motor Protection Relay. Features include broken rotor bar detection and variable-frequency drive (VFD) support as well as options for arc-flash detection, differential protection, and synchronous motor protection. The synchronous option supports power factor regulation and also includes, at no additional cost, a voltage divider accessory to interface with the motor excitation system. Together with the industry’s best AccuTrack Thermal Model, these new features combine to provide a great solution for all of your motor protection applications.
Motor Protection—Protect a full range of medium-voltage, three-phase induction and synchronous motors. The slip-dependent thermal model (AccuTrack) allows independent thermal protection of both the rotor and stator.
Arc-Flash Mitigation—Select optional arc-flash detection (AFD) inputs for overcurrent-supervised arc-flash protection. Reduce incident energy further by selecting high-speed, high-current interrupting output contacts to achieve secure, reliable, and fast arc-flash tripping.
Differential Protection—Configure current differential elements for more comprehensive protection of large, high-value motors.
Broken Rotor Bar Detection—Detect broken rotor bars in squirrel-cage induction motors by implementing the optional spectrum analysis features. Minimize repair costs and downtime by detecting rotor bar problems before they cause catastrophic motor failure.
Synchronous Motors—Protect synchronous motors (brush and brushless). Use the optional inputs for measuring and controlling excitation system signals on brushed motors. Regulate power factor using digital or analog outputs of the relay connected directly to the excitation system.
Front-Panel Flexibility—Improve functional control and situational awareness with the programmable auxiliary buttons, LEDs, and configurable labels.
Metering and Monitoring—Analyze SER reports and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics. Use the SEL-710-5 Relay’s motor start report, motor start trending, load profile monitoring, motor operating statistics, and demand metering features to reduce separately mounted metering/monitoring devices.
Integration—Select from a variety of communications ports and protocols to integrate SEL-710-5 Relays into supervisory or coordinated protection and control systems.
The SEL-710-5 provides advanced protection for induction and synchronous motors. Protection includes thermal overload, overcurrent, undercurrent, current unbalance, current differential, phase loss, ground fault, loss-of-field, over- or underfrequency, and much more.
Optimized Start Times
The SEL-710-5 calculates percent of thermal capacity used in the motor to determine maximum safe start times with full motor protection. Accurate tracking of the motor thermal capacity also minimizes the time needed between starts.
Use the eight programmable pushbuttons and 16 configurable tricolored LEDs on the front panel for quick, personalized control, with factory default start and stop functions.
Choose from single or dual, copper or fiber-optic Ethernet as well as Modbus TCP, IEC 61850, Modbus Serial, DNP3, EIA-232, EIA-485, Telnet, and File Transfer Protocol (FTP) communications. Pick one or multiple connections, including multiple Modbus sessions for custom configuration of your application.
Install in extreme environments with the industry’s widest ambient temperature operating range, –40° to +85°C (–40° to +185°F).