SEL-400G Генераторын дэвшилтэт хамгаалалтын систем

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. The new SEL Grid Configurator software allows you to quickly create, manage, and deploy device settings. Or, you can continue to use acSELerator QuickSet SEL-5030 Software for your configuration needs.


Advanced Generator and Unit Protection

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. 

Wide-Range Frequency Tracking

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.

Easy Communications

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.

RTD-Based Thermal Protection

Use as many as two external SEL-2600 RTD Modules to acquire thermal data for alarm, monitoring, and trip functions in the SEL-400G.

Metering and Reporting

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.

Synchrophasor Data

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.

Multiple Configuration Platforms

The SEL-400G can be configured, commissioned, and managed using either SEL Grid Configurator or QuickSet. Select the choice that best fits your application and software transition needs.