Schweitzer SEL-710-5 Motor Protection Relay

Schweitzer SEL-710-5 Motor Protection Relay 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, including up to five two- or three-position disconnect switches. 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, EtherNet/IP, the IEEE 1588 Precision Time Protocol (PTP), and other protocols. Together with the industry’s best AccuTrack Thermal Model, these features 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-certified 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, EtherNet/IP, IEC 60870-5-103, IEEE 1588 PTP, 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. Asset Monitoring—Reduce production losses from unexpected equipment failures and lower maintenance costs by switching to predefined maintenance schedules. The SEL-710-5 can track the operating characteristics of your motor and accompanying devices with the built-in asset monitoring capability. You can monitor items such as vibration, motor start current, motor start times, motor stop times, broken rotor bars, incipient cable faults, and excessive wear on molded-case circuit breakers. Advanced Protection 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. Easy Communications Quickly integrate the SEL-710-5 into serial- or Ethernet-based communications with IEC 61850 Edition 2, EtherNet/IP, IEEE 1588 PTP, IEC 60870-5-103, PRP, Mirrored Bits communications, DNP3 serial, DNP3 LAN/WAN, and other protocols. Web Server Access The built-in web server enables secure, remote access to the relay with password protection. You can download status reports or view metering and relay information remotely. This helps minimize trips to the relay location, saving time and money. Accelerated Firmware Downloads Simplify maintenance by downloading relay firmware via the Ethernet port. This also enables you to access and update all of your network relays simultaneously. 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. IEC 61850 Test Mode Use the IEC 61850 Test Mode to test system components in energized substations without fear of operating control output contacts. 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. Incipient Fault Detection Identify potential cable failures to extend asset life and minimize unexpected downtime. The SEL-710-5 checks for self-extinguishing half-cycle faults, providing an indication of imminent cable failures. Asset Monitoring Track the operating characteristics of your motor and accompanying devices with the predictive maintenance capability. You can reduce production losses from unexpected equipment failures and lower maintenance costs by switching to condition-based maintenance schedules. 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-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. Rugged Design 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-certified and UL Class I, Division 2-certified for use in hazardous and potentially explosive environments.