ABB RED670 1MRK000028-CAR01
ABB RED670 1MRK000028-CAR01 is a transformer differential protection relay in the ABB Relion® 670 Series, specifically designed as the primary protection for power transformers (such as two-winding, three-winding, and autotransformers). Equipped with a high-precision current differential algorithm, this relay detects internal transformer faults (including winding short circuits, turn-to-turn faults, and ground faults) and provides fast, reliable tripping protection to prevent equipment damage and power grid outages.
Product Parameters
Product Model: RED670 1MRK000028-CAR01
Manufacturer: ABB
Product Type: Transformer Differential Protection Relay
Rated Current: 1A or 5A (CT secondary side, configurable)
Differential Pickup Value: 0.1-1.0Ie (step size 0.01Ie)
Restraint Coefficient: 0.1-0.8 (adjustable slope)
Harmonic Restraint: 2nd harmonic (15-30% adjustable), 5th harmonic (optional)
Operating Time: ≤25ms (for internal faults)
Communication Protocols: IEC 61850, Modbus TCP, DNP3.0
Input/Output: 12× digital inputs, 8× relay outputs
Operating Temperature Range: -25°C to +55°C (-13°F to +131°F)
Protection Class: IP40 (panel mounting)
Mounting Method: DIN Rail or panel mounting
Certification Standards: IEC 60255, IEEE C37.90, UL 508
Structure and Composition
RED670 adopts a modular design, with main components including:
Signal Acquisition Unit: Features high-precision CT interfaces and supports multi-side current inputs (e.g., high-voltage side, low-voltage side, neutral point).
DSP Processing Module: Calculates differential current and restraint current in real time, and executes percentage restraint and harmonic analysis.
Restraint Characteristic Curve: Programmable percentage restraint curve (e.g., IEEE Std C37.91).
Communication Interface Board: Equipped with dual Ethernet ports (for IEC 61850) and RS-485 (for Modbus RTU).
Human-Machine Interface (HMI): 320×240 graphic LCD for local viewing of differential current, harmonic content, and event records.
Non-Electrical Quantity Protection Interface: Supports direct access to non-electrical quantity signals from devices such as gas relays and temperature sensors.
Key Features and Advantages
High-Precision Differential Protection:
Percentage restraint characteristic prevents false tripping during external faults (e.g., CT saturation, inrush current).
2nd/5th harmonic restraint function reliably distinguishes between fault current and inrush current.
Flexible Configuration:
Transformer type (two-winding, three-winding, autotransformer) can be selected via PCM600 software.
Automatic CT ratio compensation supports mixed use of different CT ratios.
Intelligent Diagnosis and Recording:
Fault recording function (≥128 cycles) records differential current waveforms and harmonic components.
Enables fast tripping (≤8ms) and information sharing via IEC 61850 GOOSE.
Industrial-Grade Reliability:
Wide operating temperature range of -25°C to +55°C, compliant with IEC 60068-2 environmental standards.
Built-in self-test function for real-time monitoring of hardware health status.
Application Fields
RED670 is mainly used in the following scenarios:
Power Substations: Primary protection (differential + backup protection) for 110kV/220kV/500kV transformers.
Power Plants: Differential protection for generator-transformer units.
Industrial Power Distribution: Protection for large arc furnace transformers and rectifier transformers.
Typical Application Case
In a 220kV substation, RED670 serves as the main transformer differential protection. It uploads operation information to the SCADA system via Modbus TCP, trips within 20ms in case of winding short circuits, and avoids false tripping caused by energization inrush current through 2nd harmonic restraint.
Installation and Maintenance
Installation Key Points
CT secondary wires should use shielded wires with a cross-sectional area of ≥2.5mm² to avoid induced voltage interference.
The polarity of multi-side CTs must be consistent (pointing to the transformer).
Maintenance Recommendations
Conduct percentage restraint characteristic testing (using CMC256 tester) once a year.
Regularly check the software version and upgrade it via PCM600.
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Email : sales1@xrjdcs.com
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