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 (AFD), differential protection, and synchronous motor protection. The synchronous option supports power factor regulation and includes, at no additional cost, a voltage divider accessory to interface with the motor excitation system.
An optional 5-inch, 800 × 480 color touchscreen display allows you to directly set, monitor and control your system. You can quickly integrate the SEL-710-5 into serial-or Ethernet-based communications schemes with IEC 61850 Edition 2, IEC 60870-5-103, the IEC 62439 Parallel Redundancy Protocol (PRP), Mirrored Bits communications, Modbus, DNP3, and other protocols. Together with the industry’s best AccuTrack Thermal Model, these 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.
Reliable Protection in Harsh Environments—The SEL-710-5 operates in extreme conditions, with an operating temperature of –40° to +85°C (–40° to +185°F), and it is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions. In addition, the SEL-710-5 is ATEX- and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.
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.
Flexible Communications—Choose from single or dual ports, copper or fiber-optic Ethernet or serial communications, and several protocols, including IEC 61850 Edition 2, IEC 60870-5-103, PRP, Mirrored Bits communications, DNP3 serial, and DNP3 LAN/WAN. You can select from multiple Modbus TCP or Modbus serial sessions for custom configuration of your application.
With a simple tap, quickly access bay screens, metering and monitoring data, reports, settings, and more.
To control a motor, simply tap the Control folder on the home screen, and then tap Start Motor or Stop Motor.
Use the onscreen keyboard to quickly and easily enter passwords, search for Relay Word bits, and enter settings.
Control the motor using the secure control interface.
View the real, reactive, and apparent power of each phase, and monitor the power factor.
View a graphical and textual representation of the real-time voltages and currents in a power system. Analyze the phasors to determine power system conditions.
Display the real, reactive, and apparent power of each phase in your system, and monitor the power factor information.
Easily review the time-stamped Sequential Events Recorder (SER) data, including whether or not the Relay Word bit asserted or deasserted, during root cause analysis of an event.
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.
Quickly integrate the SEL-710-5 into serial- or Ethernet-based communications with IEC 61850 Edition 2, IEC 60870-5-103, PRP, and Mirrored Bits communications, DNP3 serial, and DNP3 LAN/WAN and other protocols.
IEC 61850 Edition 2 Communications Protocol
Combine IEC 61850 Edition 2, an Ethernet network, and the SEL-710-5 for the fastest overall performance for substation automation and control. You can improve security using the password authentication and session time-out features, transfer event files in COMTRADE and CEV formats, and transfer CID files, settings, and reports. acSELerator Architect SEL-5032 Software streamlines the configuration of IEC 61850 in the SEL-710-5.
Simple Network Time Protocol (SNTP)
Simplify wiring and installation by receiving a time signal over existing Ethernet networks. SNTP makes a good backup to more accurate IRIG-B time synchronization. The 5 ms accuracy is ideal for basic time synchronization throughout a substation.
Optional Touchscreen Display
The easy-to-use touchscreen interface provides a one-line mimic display for bay control and monitoring. You can view metered quantities, phasor diagrams, relay settings, event summaries, target statuses, Sequential Events Recorder (SER) data, and more. Extensive testing shows that the robust capacitive touchscreen display meets or exceeds industry standards as well as SEL quality and reliability requirements.
Use the programmable pushbuttons with tricolor LEDs on the front panel for quick, personalized control.
Expanded SELogic Control Equations
Use math and logic combinations of analog and digital values for customized applications. You can adapt system control based on prefault conditions and scale analog values and latch momentary inputs for SCADA retrieval.
Metering and Reporting
View SER and 180-cycle oscillographic event reports in COMTRADE and CEV formats for rapid commissioning, testing, and post-fault diagnostics. Ethernet FTP or IEC 61850 MMS allows you to easily retrieve COMTRADE files.
AccuTrack Thermal Model
Apply the SEL-710-5 to dynamically calculate motor slip and precisely track the rotor thermal capacity used. The AccuTrack Thermal Model uses this information to reduce the time between starts and give the motor more time to reach its rated speed before tripping.
Motor Thermal Overload Protection
The SEL-710-5 provides locked-rotor, running overload, and negative-sequence current unbalance protection. It uses the AccuTrack Thermal Model to accurately track the heating effects of load current and current unbalance during the motor’s operating conditions (starting and running).
Arc-Flash Detection (AFD)
AFD-based protection is fast, responding in a few milliseconds with high-speed, high-current interrupting output contacts. This fast response, supervised by phase overcurrent elements, provides high-speed and secure arc-ﬂash protection that improves personnel safety and reduces equipment damage. Arc-ﬂash mitigation options in the SEL-710-5 offer either four or eight AFD inputs capable of reading both point and loop sensors.
Trust the industry’s widest ambient operating temperature range, –40° to +85°C (–40° to +185°F). The SEL-710-5 withstands vibration, electrical surges, fast transients, and extreme temperatures, meeting stringent industry standards. A conformal-coating option for the printed circuit boards provides an additional barrier to airborne contaminants, such as hydrogen sulfide, chlorine, salt, and moisture. In addition, the SEL-710-5 is ATEX- and Underwriters Laboratories (UL) Class I, Division 2-certified for use in hazardous and potentially explosive environments.
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