SEL-400G

Advanced Generator Protection System

The SEL-400G is a state-of-the-art protection system designed for all types of generators, including hydro, pumped-storage, large steam turbines, and combustion gas turbines (CGT). This device integrates generator protection, generator step-up (GSU) transformer protection, autosynchronizing, and disturbance recording into a single processor. With 18 current inputs and 6 voltage inputs, it supports flexible protection schemes for complex system configurations and provides reliable protection from startup to normal operation.

Key Features

Dual Universal Differential Zones

Provides two independent differential protection zones, allowing the protection of both the generator and the GSU transformer within a single device.
Wide-Range Frequency Tracking

Supports a broad frequency tracking range from 5 Hz to 120 Hz to maintain dependable protection during generator startup or variable-speed operations (e.g., pumped storage).
100% Stator Ground Protection

Combines neutral overvoltage (59N) and third-harmonic voltage elements to protect the entire stator winding without blind spots.
Advanced Protection Algorithms

Turn-to-Turn Fault Detection: Detects sensitive internal short-circuit faults within generator windings.
Current Unbalance Protection (46): Prevents rotor heating caused by unbalanced loads.
Out-of-Step Protection (78): Protects equipment by detecting loss of synchronism between the generator and the grid.
Phase Distance Protection (21): Provides backup protection for the generator and adjacent lines.
Precision Metering and Monitoring

High-Accuracy Metering: Precisely measures voltage, current, power (MW, MVAR), energy (MWh), and frequency.
Synchrophasors: Supports wide-area monitoring with IEEE C37.118-compliant phasor measurement data.
Condition Monitoring: Includes monitoring for breaker contact wear and station battery voltage.

SEL Grid Configurator Software

Helps manage and deploy complex settings quickly and easily through a modern, intuitive interface.
Customizable HMI

The large front-panel display can implement mimic diagrams, and user-programmable pushbuttons and LEDs allow for immediate local control and status monitoring.
Built-in Autosynchronizer

Automatically matches voltage, frequency, and phase for up to three breakers for grid connection. This eliminates the need for external synchronizing devices, reducing system costs.
Robust Communication Protocol Support

Supports Ethernet-based IEC 61850 Edition 2.1 (optional), Modbus TCP, DNP3, FTP, and more.
Maximizes communication reliability by supporting PRP (Parallel Redundancy Protocol) for network redundancy.
Precision Time Synchronization

Enables microsecond-level time synchronization via PTPv2 (IEEE 1588) and IRIG-B inputs, providing accurate time-series data for event analysis.

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