The SEL-400G offers primary and backup protection for generators of all sizes and types, including hydro, pumped-storage hydro, steam turbine, and combustion gas turbine generators. It combines generator, bus, and step-up transformer protection in one package, making the relay an economical solution for an entire generation unit.
Advanced protection functions, like transverse differential protection, provide turn-to-turn fault detection, which allows for earlier fault detection, limits damage to your generator, and helps you return to service faster. Adaptive differential protection and a wide frequency tracking range (5–120 Hz) improve protection security. Dual frequency zones and autosynchronization offer smooth synchronization to the grid.
You can quickly integrate the SEL-400G into serial- or Ethernet-based communications. SEL Grid Configurator software allows you to quickly create, manage, and deploy device settings.
Advanced Generator Protection—Two independent universal differential elements provide protection for the generator and GSU transformer in a single relay. With its 18 current inputs, 6 voltage inputs, and wide-range frequency tracking (5–120 Hz), the SEL-400G can be applied in a wide variety of generator configurations. In addition, its advanced antimotoring protection and loss-of-field protection elements further protect your generator.
Pumped Storage Logic—This feature enables pumped storage hydropower protection without the need for external relays to switch CT wiring, which lowers costs and improves reliability.
Stator Ground Fault Protection—Achieve passive and active ground fault detection across 100 percent of the stator winding. The stator winding ground fault protection elements include integrating timers that detect intermittent ground faults and isolate the generator before the fault evolves into a permanent fault.
Rotor/Field Winding Protection—Applying the SEL-2664 Field Ground Module and the SEL-2664S Stator Ground Protection Relay with the SEL-400G allows you to protect your system against rotor/field winding short circuits. With the field ground protection element, the first fault will trigger an alarm and a second fault results in a trip signal. This allows you to continue meeting your generating obligations and to schedule an outage at a preferred time.
Simplified Settings Management—SEL Grid Configurator is a new configuration software tool that increases efficiency and improves settings insights. It features a spreadsheet-style editor, powerful protection visualization, comprehensive reporting, custom filters, and multiple-device settings management.
Communication and Integration—Quickly integrate the SEL-400G into serial- or Ethernet-based communications with IEC 61850, IEC 62439 PRP, Mirrored Bits communications, Modbus, DNP3, and other protocols.
EIA-232 front serial port is quick and convenient for system setup and local access
Front-panel display allows operators to control and view the status of disconnects and breakers
User-selectable mimic screens show the system configuration in one-line diagram format
Easy-to-use keypad aids simple navigation
Front-panel, tricolor LEDs indicate custom alarms and provide fast and simple information to assist dispatchers and line crews with rapid power restoration
Programmable operator pushbuttons with user-configurable labels allow front-panel customization
Choose from a horizontal panel-mount or rack-mount chassis
Communications protocols include FTP, Telnet, synchrophasors, DNP3 LAN/WAN, the Parallel Redundancy Protocol (PRP), IEC 61850 Edition 2, and the IEEE 1588 Precision Time Protocol Version 2 (PTPv2). For PTPv2 implementation, Ports 5A and 5B must be ordered as an option.
Use three rear EIA-232 ports for Mirrored Bits communications, DNP3, SCADA, and engineering access
Power supply options include: 24–48 Vdc; 48–125 Vdc or 110–120 Vac; or 125–250 Vdc or 110–240 Vac
The 18 current and 6 voltage channels can be configured for a variety of applications
Increase machine life by detecting faults and abnormal conditions before they cause permanent damage. The 18 current and 6 voltage inputs on the SEL-400G enable complex generator protection schemes or protection of other equipment, such as transformers.
The wide-range frequency tracking (5 to 120 Hz) ensures that all protection functions are secure and dependable across a wide range of system frequencies or generator speeds. This provides protection during events such as unit overspeed or inverter-driven startup.
The built-in automatic synchronizer function eliminates the need for expensive external synchronizer equipment. The SEL-400G automatically synchronizes frequency, voltage, and phase control and connects the generator to the power system.
Quickly integrate the SEL-400G into serial- or Ethernet-based communications with IEC 61850, IEC 62439 PRP, Mirrored Bits communications, Modbus, DNP3, and other protocols.
Use as many as two external SEL-2600 RTD Modules to acquire thermal data for alarm, monitoring, and trip functions in the SEL-400G.
View generator autosynchronizer, Sequential Events Recorder (SER), and various event reports in COMTRADE format to analyze generator startup, shutdown, or system faults. Measure electrical, thermal, and generator run-time quantities and 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-400G phasor measurement accuracy complies with IEEE C37.118.1/2-2011, -2014a.
The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.