ABB REB670 1MRK002820-AC 670 Series Protective Relay Device

Product Description
The ABB REB670 1MRK002820-AC is a busbar protection relay from ABB’s Relion 670 series, designed for precise fault isolation in power system busbars. It combines low-impedance differential protection algorithms with rapid response mechanisms to prevent fault propagation across the grid. Its modular architecture supports flexible configuration for various voltage levels and busbar topologies, making it suitable for both greenfield substations and retrofit projects.

Key Specifications
1 Model: 1MRK002820-AC
2 Brand: ABB
3 Function: Busbar protection relay with differential, ground fault, and overcurrent protection.
4 Protection Features:

• Differential Protection: Low-impedance algorithm supporting up to 6 constrained CT inputs, with 2nd and 5th harmonic blocking to prevent CT saturation and transformer inrush misoperations.
• Ground Fault Protection: High-sensitivity zero-sequence overcurrent protection for low/high-impedance grounded faults.
• Overcurrent Protection: Four-stage phase-to-phase and ground overcurrent protection with directional or non-directional time delays.
  5 Communication: IEC 61850-9-2LE process bus support (up to 6 merging units), compatible with Modbus RTU/TCP, PROFIBUS-DP.
  6 Electrical Parameters: Operating voltage 100-240V AC, frequency 50/60Hz, power consumption ≤50W.
  7 Environmental Adaptability: Operating temperature -20°C to +60°C (some models -40°C to +70°C), protection class IP45 (optional IP65).
  8 Reliability: MTBF ≥150,000 hours, hot-swappable design, fault recording for 40 analog signals and 96 digital signals.

Application Areas
1 Power Transmission & Distribution: Busbar protection in power plants and substations to prevent full-station blackouts.
2 Industrial Energy: Ensuring reliable busbar供电 (power supply) in steel, chemical, and metallurgical industries.
3 Renewable Energy: Protecting busbars in centralized wind/solar power plants.
4 Infrastructure: Critical power supply for railways, data centers, and airports.

Summary and Analysis
Core Strengths:
Precision and Speed: Low-impedance differential protection achieves ≤10ms response times for internal busbar faults, outperforming industry standards.
Versatility: Supports protection for two/three-winding transformers, autotransformers, and phase-shifting transformers across voltage levels ≤220kV.
Smart Integration: Built-in fault recording and event logging, compatible with ABB Ability™ for predictive maintenance and PHM.

Reasons to Choose:
Proven Reliability: Backed by ABB’s 50+ years of relay expertise, the REB670 1MRK002820-AC is certified by KEMA and CGC, with global project validation.
Low TCO: Modular design reduces spare parts inventory, while its high MTBF cuts replacement costs by 30%+ over competitors.
Future-Ready: IEC 61850 compliance enables seamless integration into smart substations, supporting Industry 4.0 upgrades.

Potential Challenges:
Initial Complexity: Requires expert engineers for protection setting calibration and logic programming; recommend ABB-certified partners for deployment.
Premium Pricing: High performance comes at a cost premium over some domestic brands, making it ideal for core infrastructure but not all scenarios.