ABB SPAD346C3 Differential Relay Protection Device – Key Functions
1. Core Protection Function
Differential Current Protection: Detects and trips during internal faults (e.g., short circuits) in transformers, generators, or busbars by comparing current magnitudes at different points.
High-Speed Operation: Responds within milliseconds to prevent equipment damage.
2. Advanced Features
Harmonic Restraint: Minimizes false trips during inrush currents (e.g., transformer energization).
Biased Differential Protection: Adjusts sensitivity based on load conditions for improved stability.
3. System Integration
Communication Protocols: Supports IEC 61850, Modbus, or DNP3 for SCADA integration.
Event Logging: Records fault waveforms and timestamps for post-event analysis.
4. Applications
Power Transformers: Primary protection for winding faults.
Generators/Motors: Guards against stator ground faults.
Busbars: Detects zone-specific faults in substations.
5. Key Features
Self-monitoring with alarm outputs for relay health.
Test Mode for offline verification without disconnection.
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