ABB SYNCHROTACT 5 Automatic Synchronizing & Synchrocheck Relay
1. Core Functions
Automatic Synchronization: Controls the voltage, frequency and phase of generators / lines to fully match the power grid, enabling safe closing and grid connection.
Synchrocheck: Provides safety interlocking during manual grid connection to prevent out-of-synchronism closing.
Multi-object Control: A single device can store 7 sets of parameters and control up to 7 circuit breakers.
Dead Bus Synchronization: Supports closing logic when one side is without voltage.
Frequency Compatibility: Suitable for 50Hz / 60Hz / 16.7Hz (railway traction networks).
2. Key Technical Highlights
Dual-channel Safety Architecture
Two systems with independent hardware, CPUs from different manufacturers, and different software operate in series.
Channel 1 performs synchronization, while Channel 2 provides independent monitoring to prevent common cause failures and achieve the highest safety level.
Communication & Remote Functionality
Supports IEC 61850, Modbus, Profibus, and LON buses.
Supports TCP/IP remote maintenance, diagnosis, and firmware upgrade.
Configuration Software – SynView 5

Supports parameter configuration, oscillography, event logging, and fault diagnosis on Windows platforms.
3. Typical Applications
Power plants: Generator-to-grid synchronization
Substations: Line / busbar paralleling
Industrial captive power plants, data centers, marine power stations
Power grid black start (dead bus closing)
4. Upgrade Path
Can be directly upgraded to SYNCHROTACT 6: fully compatible in dimensions and wiring, with low replacement cost.














