The ABB RET670 1MRK004816-AC Transformer Protection Relay is a highly advanced protective relay designed for power transformers, offering comprehensive protection, monitoring, and control capabilities.
Below are its key functions and applications:
1. Core Functions
Transformer Differential Protection:
Provides high-speed, low-impedance differential protection for two-winding and three-winding transformers, including auto-transformers and phase-shifting transformers.
Features waveform blocking and 2nd/5th harmonic restraint to prevent maloperation during inrush currents and overexcitation conditions.
Ground Fault Protection:
Includes high-sensitivity zero-sequence differential protection for effectively detecting ground faults in solidly or low-impedance grounded transformer windings.
Supports restricted earth fault (REF) protection for enhanced sensitivity in detecting internal winding faults.
Backup Protection & System Monitoring:
Offers multi-stage directional overcurrent protection (4 stages per winding) with optional inverse-time or definite-time characteristics.
Integrates distance protection (up to 5 zones) for phase-to-phase and ground faults, with load encroachment detection.
Provides real-time system monitoring and event recording for fault analysis and diagnostics.
Communication & Automation:
Supports IEC 61850-9-2LE process bus for seamless integration with modern substation automation systems.
Compatible with SCADA and control systems for remote operation and data exchange.
2. Applications
Power Transformers: Protection for generator step-up (GSU), shunt reactors, and industrial transformers.
Grid Infrastructure: Used in transmission lines, T-connected feeders, and busbar protection schemes.
Renewable Energy: Safeguards transformers in wind/solar farms and hybrid power plants.
3. Technical Advantages
Modular Design: Hot-swappable components for easy maintenance.
High Reliability: Robust performance in harsh environments with EMI/EMC compliance.
Flexible Configuration: Adaptable to various CT ratios and system topologies.
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