Product Short Description
Product Introduction
The ABB REJ601 BD446NN1XG is an entry‑level, dedicated numerical feeder protection relay from ABB’s Relion® 605 series, designed for primary and secondary medium‑voltage (3 kV–36 kV) distribution networks. It integrates comprehensive protection, basic control, measurement, and monitoring functions in a compact, cost‑effective unit, optimized for utility substations and industrial power systems. This model supports conventional current transformer (CT) interfaces and offers flexible configuration for solidly earthed, resistance‑earthed, and isolated neutral networks. It features a press‑fit mounting design, universal power supply, and preconfigured functions for fast commissioning, making it ideal for space‑constrained switchgear and retrofit applications.
Description
Technical Specifications
| Parameter | Detail |
|---|---|
| Manufacturer | ABB |
| Model | REJ601 BD446NN1XG |
| Product Type | Numerical Feeder Protection Relay |
| Application Voltage | 3 kV–36 kV (medium‑voltage distribution) |
| Rated Frequency | 50 Hz / 60 Hz |
| Auxiliary Power Supply | Universal 24–265 V AC / 24–250 V DC ±20% |
| Power Consumption | < 10 W (typical) |
| Analog Inputs | 4 AC inputs (3 phase currents + 1 residual current); field‑selectable 1 A / 5 A CT rating |
| Digital Inputs | 4 galvanically isolated dry‑contact inputs |
| Digital Outputs | 6 configurable relay outputs (includes trip and signal contacts) |
| Communication Interface | RS‑485 port |
| Supported Protocols | Modbus RTU, IEC 60870‑5‑103 |
| Time Synchronization | Internal clock; supports external synchronization via communication |
| HMI | Local Human‑Machine Interface (LHMI) with LCD display, LED indicators, and pushbuttons |
| Operating Temperature | -25 °C to +70 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5–95% (non‑condensing) |
| Ingress Protection | IP20 (terminal area), IP40 (front panel) |
| Mounting | Press‑fit design; compatible with ABB VD4/HD4 circuit breakers; 19‑inch rack or panel mounting |
| Dimensions | Compact form factor (standard relay size) |
| Weight | Approx. 1.5 kg |
| Certifications | CE, IEC 61000, RoHS, KEMA type‑test certified |
| MTBF | ≥ 100,000 hours |
Functional Features
Comprehensive Protection Functions
- Three‑Stage Overcurrent Protection: Directional/non‑directional phase overcurrent (50/51) with Definite Time (DT) and Inverse Definite Minimum Time (IDMT) characteristics (Normal Inverse, Very Inverse, Extremely Inverse, Long‑time Inverse, and special RI Inverse)eero.
- Two‑Stage Earth‑Fault Protection: Residual overcurrent (50N/51N) with selectable DT/IDMT; supports external core balance CT or internal residual current calculationeero.
- Thermal Overload Protection: Real‑time thermal modeling for cables, overhead lines, and transformers to prevent overheating.
- Negative‑Phase Sequence Protection: Detects phase imbalance and protects against unbalanced load conditions.
- Phase Discontinuity Protection: Identifies broken conductors and single‑phasing faults.
- Inrush Current Stabilization: Filters transformer inrush currents to avoid nuisance tripping during energizationeero.
- Circuit Breaker Failure Protection (CBFP): Initiates backup tripping if the main breaker fails to clear faults.
- Auto‑Reclosing: Configurable 1–2 shot auto‑reclose (79) for rapid restoration of overhead line feeders.
Control & Configuration
- Local Breaker Control: Dedicated pushbuttons for manual ON/OFF control of one circuit breaker via LHMIeero.
- Setting Groups: 2 independent setting groups for quick adaptation to network operating modes.
- Configurable Logic: User‑programmable Boolean logic and timers for custom interlocking and control sequences.
- Selective Test Function: Independent testing of protection functions, binary signals, and communication for fast commissioning.
Measurement & Monitoring
- Precision Measurements: Real‑time measurement of phase currents, residual current, and basic power parameters.
- Event Logging: Stores up to 2,000 sequence‑of‑events (SOE) with timestamps for fault analysis.
- Disturbance Recording: Captures fault data in COMTRADE format via front USB port for post‑fault diagnostics.
- Self‑Supervision: Continuous hardware and software diagnostics with alarm generation for internal faults.
- CT/VT Supervision: Detects secondary circuit faults and blocks protection to prevent misoperation.
Communication & Integration
- RS‑485 Connectivity: Supports Modbus RTU and IEC 60870‑5‑103 for integration with SCADA systems.
- USB Port: Front‑facing USB for fast upload of event logs, fault records, and configuration files.
- Plug‑and‑Play: Press‑fit mounting enables tool‑less installation and replacement without system shutdown.
Reliability & Safety
- EMC Compliance: Meets IEC 61000 standards for immunity to electromagnetic interference.
- Galvanic Isolation: Full isolation between analog inputs, digital I/O, and communication ports.
- CT Shorting Facility: Detachable terminals with built‑in CT shorting for safe maintenance.
Application Scenarios
Utility Distribution Networks
- Feeder Protection: Primary protection for overhead lines and cable feeders in urban/rural primary and secondary distribution substationseero.
- Compact Substations: Ideal for ring main units (RMUs), kiosk substations, and space‑limited switchgear assemblies.
- Distribution Transformers: Inrush current stabilization and overload protection for small‑to‑medium distribution transformerseero.
- Isolated/Resistance‑Earthed Networks: Reliable earth‑fault protection in non‑solidly earthed systems.
Industrial Power Systems
- Manufacturing Facilities: Protection for medium‑voltage motor feeders and process power circuits in light industry.
- Mining & Minerals: Compact design for underground and surface mine distribution systems.
- Water & Wastewater: Protection for pump station medium‑voltage feeders and treatment plant power systems.
- Commercial Buildings: Cost‑effective feeder protection for large commercial complexes and retail centers.
Retrofit & Upgrade Projects
- Legacy Substation Modernization: Replaces electromechanical relays in existing distribution substations with minimal wiring changes.
- Switchgear Retrofit: Direct mounting on ABB VD4/HD4 circuit breakers for quick upgrade of aging switchgear.
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