The SEL-700G is the right solution for utility and industrial generator protection, with an autosynchronizer, flexible I/O, and advanced communications. It provides a complete protection and synchronization solution for synchronous generators, so you can eliminate the complexity and cost of standalone synchronizer packages. Integrating the synchronization capability into the generator protection relay provides the most cost-effective and reliable solution.
The 5-inch, 800 x 480 color touchscreen display option allows you to directly set, monitor, and control your system. A small form factor and multiple mounting adapters make it easy to upgrade protection without cutting or drilling existing cutouts. You can quickly integrate the SEL-700G into serial- or Ethernet-based communications with IEC 61850 Edition 2, IEC 60870-5-103, the IEC 62439 Parallel Redundancy Protocol (PRP), Mirrored Bits communications, Modbus, DNP3, and other protocols.
Comprehensive Generator Protection—Connect the SEL-700G across small, medium, or large generators for complete primary and backup protection. The SEL-700GT provides an IEEE 1547-compliant intertie protection solution for distributed generation. Adding the optional neutral voltage connection to the SEL-700G provides 100 percent stator ground protection, based on third-harmonic voltage measurements. You can connect the neutral current input to protect solidly grounded or resistance-grounded machines.
Autosynchronizer—Replace external generator control and synchronizer relays with the built-in automatic synchronizer function. The SEL-700G automatically synchronizes frequency, voltage, and phase control and connects the generator to the power system. A PC-based synchroscope and generator start reports allow you to monitor the generator synchronization process.
Current Differential Protection—Apply sensitive percentage-restrained current differential elements and an unrestrained element, along with synchronism check and volts-per-hertz elements, to protect both the generator and the step-up transformer. Optional current differential elements detect stator faults using a secure, sensitive current differential function. Power transformer and CT connection compensation allows the unit step-up transformer to be included in the generator differential zone.
Breaker Wear Monitoring—Record accumulated breaker contact wear with the breaker monitor function, which uses the manufacturer’s specifications for defining breaker operation limits. The internal monitor tracks the total number of close/open operations and integrates the interrupted current per phase. You can set an alarm to alert operators when measured and accumulated quantities approach maintenance thresholds. This information facilitates proactive breaker maintenance and replacement without underutilizing resources.
Easy 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, the IEC 62439 Parallel Redundancy Protocol (PRP), Mirrored Bits communications, Modbus, DNP3 serial, and DNP3 LAN/WAN. Multiple Modbus TCP or Modbus serial sessions are available for custom configuration of your application.
Islanding Detection—The optional vector-shift function (78VS) and rate-of-change-of-frequency protection (81RF) support islanding detection.
With a simple tap, quickly access bay screens, metering and monitoring data, reports, settings, and more.
Select from predefined bay screens, or configure your own. Control a single breaker, monitor as many as five disconnect switches, and view analog and digital data in a contextual display.
Verify breaker and disconnect changes using the secure control interface.
Use the onscreen keyboard to quickly and easily enter passwords, search for Relay Word bits, and enter settings.
View the real-reactive, and apparent power of each phase, and monitor the power factor.
View a graphical and testual representation of the real-time voltages and currents in a power system. Analyze the phasors to determine power system conditons.
Display the real, reactive, and apparent energy metering quantities imported and exported in a system. Easily reset the values via the display, and record the time and date of reset.
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.
Comprehensive Generator Protection
Numerous current, voltage, frequency, distance, power, and out-of-step elements provide comprehensive protection for large, medium, and small generators.
The optional, built-in automatic synchronizer function eliminates the need for expensive external synchronizer equipment. The SEL-700G automatically synchronizes frequency, voltage, and phase control and connects the generator to the power system.
Quickly integrate the SEL-700G into serial- or Ethernet-based communications with IEC 61850 Edition 2, IEC 60870-5-103, IEC 62439 PRP, Mirrored Bits communications, Modbus, DNP3 serial, DNP3 LAN/WAN, and other protocols.
100% Stator Ground Detection
The SEL-700G detects stator ground faults on high-impedance grounded generators using a conventional neutral-overvoltage element with a third-harmonic voltage differential detection scheme for 100 percent stator winding coverage.
Current Differential Protection
Optional current differential elements detect stator faults using a secure, sensitive current differential function. Power transformer and CT connection compensation allows the unit step-up transformer to be included in the generator differential zone.
Sensitive power elements protect against reverse power, overload conditions, or low forward power.
RTD-Based Thermal Protection
Use an internal 10 RTD input card or an external SEL-2600 RTD Module to acquire thermal data for alarm, monitoring, and trip functions in the SEL-700G.
Metering and Reporting
View generator autosynchronizer, Sequential Events Recorder (SER), and 180-cycle oscillographic event reports in COMTRADE and CEV formats to analyze generator startup, shutdown, or system faults. Measure electrical, thermal, and generator run-time quantities. You can retrieve COMTRADE files via Ethernet FTP or IEC 61850 MMS.
Apply SEL synchrophasors (IEEE C37.118) to turn state estimation into state measurement and to provide early warning of potential system instability. The SEL-700G phasor measurement accuracy meets the IEEE C37.118-2005 Level 1 requirement.
Vector Shift Protection
The vector shift element provides another element of protection for distributed generators connected to the utility network. It operates within three cycles—fast enough to prevent out-of-synchronization reclosing with the network feeders to avoid generator damage.
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