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ABB REJ601 Feeder Protection Relay

I. Product Overview

II. Technical Specifications

III. Application Scenarios

1. Utility Distribution Grids: Protects MV feeders (10kV/20kV) in urban or rural power distribution networks, isolating faults (e.g., line-to-ground short circuits) to prevent outages from spreading to other areas.
2. Industrial Power Networks: Safeguards MV feeders supplying power to factories (e.g., manufacturing plants, refineries) or industrial parks—ensuring uninterrupted power for critical production lines by quickly clearing overloads or short circuits.
3. Commercial & Infrastructure Projects: Used in airports, railways, or large commercial complexes to protect MV feeders powering auxiliary systems (e.g., lighting, HVAC, traction power for trains), minimizing downtime for public services.
4. Renewable Energy Integration: Protects MV feeders connecting solar/wind farms to the grid, preventing overcurrent from renewable energy fluctuations (e.g., sudden wind gusts) and ensuring grid stability.

IV. Key Advantages

1. Comprehensive Protection Coverage: Integrates all essential feeder protection functions (overcurrent, earth fault, overload) in one device, eliminating the need for multiple standalone relays and simplifying system design.
2. Fast & Precise Tripping: Inverse-time tripping curves (e.g., IEC standard curves like IDMT, EIDMT) enable selective fault clearing—tripping only the faulty feeder while keeping adjacent circuits operational, reducing outage 范围.
3. Advanced Communication: Native IEC 61850 support enables seamless integration with smart grids and digital substation systems, facilitating remote monitoring, configuration, and fault diagnosis (e.g., real-time fault location via SCADA).
4. Flexible Configuration: User-defined protection settings (e.g., tripping delays, current thresholds) and optional functions (breaker failure protection) adapt to diverse feeder types (e.g., overhead lines, cables) and network requirements.
5. Reliable Operation: Industrial-grade components, wide temperature tolerance (-25°C to +70°C), and robust EMC immunity (IEC 61000-6-2) ensure stable performance in harsh MV switchgear environments (dust, vibration, electrical interference).

V. Usage Notes

1. CT/VT Matching: Ensure CT (current transformer) and VT (voltage transformer) ratings match the relay’s input specifications (e.g., 5A CT for 5A input relay). Mismatched CT/VT will cause measurement errors or failed protection.
2. Protection Setting Calibration: Configure tripping curves and thresholds based on the feeder’s load characteristics (e.g., use IDMT curve for overhead lines, definite time for cables) and coordinate with upstream/downstream relays to avoid "nuisance tripping" or delayed fault clearing.
3. Communication Network Security: For IEC 61850/Modbus TCP, implement network security measures (e.g., firewalls, access control lists) to prevent unauthorized access or cyber threats to the relay.
4. Regular Testing: Perform periodic functional tests (e.g., inject test currents to verify tripping, check communication connectivity) and calibration (annually recommended) to ensure protection logic operates correctly.
5. Fault Record Analysis: Use the relay’s built-in fault recorder (to capture pre-fault/post-fault data) to analyze fault causes (e.g., short circuit location, overload duration) and optimize network reliability.
6. Genuine Spare Parts: Only replace components (e.g., power supply modules, relay outputs) with ABB-approved parts—non-genuine parts may compromise protection performance and void the warranty.

The structure and details of the product：

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