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Help CenterABB REJ601BD446NN1XG Relion® 605 Series Feeder Protection Relay
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1. Product Description
ABB REJ601BD446NN1XG is an industrial‑grade digital feeder protection relay belonging to the ABB Relion® 605 series. It is specially designed for public substations and industrial power systems in primary and secondary distribution networks. It is mainly used as the main protection for overhead lines, cable feeders and distribution transformers. It is not equipped with a circuit breaker control unit and focuses on core protection and monitoring functions such as overcurrent and earth fault.
The relay adopts a compact and modular design, supporting both conventional CT (1A rated current, IEC standard) and Rogowski current sensor input types. It integrates a high‑precision signal processing unit and a comprehensive self‑monitoring system, featuring fast response, high reliability and strong electromagnetic interference immunity. It is compatible with various earthing systems including solid earthing, resistance earthing and isolated neutral. With universal wide‑range AC/DC auxiliary power supply and configurable binary I/O, it simplifies installation and commissioning, providing a cost‑effective protection solution for medium‑voltage switchgear, distribution network renovation and new construction projects.
2. Technical Specifications
| Parameter Category | Details |
|---|---|
| Model | REJ601BD446NN1XG (IEC standard, CT 1A, without communication module) |
| Manufacturer | ABB |
| Product Type | Digital feeder protection relay (without circuit breaker control), Relion® 605 series, suitable for medium‑voltage distribution network protection |
| Core Functions | 1) Main protection: overhead lines, cable feeders, distribution transformers (inrush stabilization);2) Fault monitoring: overcurrent, earth fault, phase failure, negative sequence, thermal overload;3) Data recording: events, fault recording, disturbance recording;4) System integration: wide‑range power supply + configurable I/O, suitable for various switchgears;5) CT selection: field‑selectable 1A/5A (this model is fixed at 1A CT) |
| Electrical Parameters | Auxiliary supply: universal wide range 24–265V AC/DC; Power consumption: ≤15W;CT rated current: 1A (IEC standard);Overvoltage, reverse polarity, overcurrent and over‑temperature protection;Compliant with IEC 61850, IEC 60255, CE, RoHS, IEC 61508 SIL2 |
| Protection Performance | Three‑stage overcurrent + two‑stage earth fault protection;Supports DT definite time / IDMT inverse time curves;Inrush stabilization prevents maloperation during transformer energization;Protection operating time ≤20ms; Current measurement accuracy: ±0.2% FS |
| I/O & Communication | No communication module in this version (optional Modbus RTU/IEC 60870‑5‑103 via RS‑485);Standard: 8 DI + 4 DO (configurable via HMI);Front USB port for fault data export;Local LHMI graphical interface for parameter setting and status monitoring |
| Physical Dimensions | DIN‑standard panel mounting; Dimensions: 96×96×70mm (W×H×D); Weight: approx. 0.6kg;Plug‑in terminals with CT short‑circuit design, tool‑free installation |
| Protection Degree | Front panel IP54, rear casing IP30;EMC compliance with IEC 61000‑4 series, suitable for high‑interference substation/switchgear environments |
| Environmental Rating | Operating temperature: -25°C ~ +70°C; Storage temperature: -40°C ~ +85°C;Relative humidity: 5% ~ 95% (non‑condensing);Vibration: IEC 60068‑2‑6; Shock: IEC 60068‑2‑27 |
| Other Features | Modular hardware + firmware upgrade; Full hardware and software self‑supervision and alarms;Pre‑configured protection schemes for high commissioning efficiency;All settings can be completed via local HMI without extra software;MTBF > 150,000 hours |
3. Functions & Features
(1) Wide Application & Seamless System Compatibility
Full grid coverage: suitable for overhead lines and cable feeders in solid‑earthed, resistance‑earthed and isolated neutral systems. Inrush stabilization allows direct use as main protection for distribution transformers without additional devices.
Hardware & interface compatibility: supports 1A CT (this model) and Rogowski sensors, enabling direct replacement of old electromechanical relays. Universal 24–265V AC/DC power supply eliminates external power modules. Configurable DI/DO match signal and control circuits of various switchgears.
Fast deployment: pre‑configured templates, settings import via local HMI or USB. Plug‑in terminals with integrated CT short‑circuit allow safe installation without disconnecting CT circuits.
(2) Accurate Protection & Efficient Monitoring
Hierarchical protection system: three‑stage overcurrent (definite / inverse time selectable) + two‑stage earth fault protection, plus phase failure, negative sequence and thermal overload. Transformer inrush detection prevents tripping during energization.
High‑accuracy measurement & recording: current measurement accuracy ±0.2% FS. Built‑in event recording, fault recording and disturbance recording, with fast data export via front USB for fault analysis.
No circuit breaker control: dedicated to protection and monitoring without integrated breaker control, ideal for applications requiring only protection functions, reducing cost and system complexity.
(3) High Reliability & Comprehensive Protection
Industrial‑grade EMC immunity: compliant with IEC 61000‑4 series, stable operation in strong electromagnetic interference environments. Robust mechanical design withstands vibration and shock per IEC 60068.
Complete self‑supervision: dual online hardware and software diagnostics. Any abnormality (CT ，power fault, program error) triggers alarm and recording. Non‑volatile memory retains settings and fault data during power loss.
Safe terminal design: plug‑in terminals with built‑in CT shorting links. No external CT shorting needed during replacement, avoiding high voltage and ensuring personnel safety.
(4) Easy Maintenance & Intelligent Management
Intuitive local operation: integrated LHMI with display and keypad for real‑time data viewing, setting configuration, alarm reset and fault log export without a laptop.
Flexible firmware upgrade: supports online update via USB or optional communication module to fix issues and add functions, extending product lifecycle.
Low maintenance cost: MTBF > 150,000 hours, low failure rate. Modular design for common spare parts. No complicated customization required, minimizing maintenance workload.
4. Applications
Distribution feeder: main protection for overhead lines and cable feeders in urban and industrial park distribution networks, suitable for solid‑earthed, resistance‑earthed and isolated neutral systems.
Distribution transformer: main protection, using inrush stabilization to prevent maloperation during energization, protecting against overcurrent and earth fault damage.
Medium‑voltage switchgear: compact panel‑mount design for new switchgear projects and protection system retrofits in old substations.
Industrial power systems: feeder protection in factory internal grids and captive power plants, meeting high reliability and anti‑interference requirements in industrial environments.
5. FAQs & Troubleshooting
1. Protection fails to operate or maloperates
Check correct CT wiring (1A CT, correct polarity), no open/short circuit in CT circuit.
Verify protection settings (overcurrent level, time settings, earth fault parameters) match site requirements.
Confirm transformer inrush detection is enabled if applied to transformer protection.
Check system earthing type; earth fault protection in isolated neutral systems requires coordination with insulation monitoring.
2. Cannot export fault data or configuration fails
Ensure USB drive is formatted to FAT32 and capacity ≤32GB.
Check USB connection for looseness or damage; test with another USB drive.
Upgrade firmware to resolve potential software compatibility issues.
For communication‑based configuration, verify matching parameters (address, baud rate, protocol).
3. Frequent alarms or unexpected restart
Measure auxiliary supply voltage within 24–265V AC/DC, check for fluctuations.
Eliminate strong electromagnetic interference (e.g., nearby large motor starting); separate communication and power cables, use shielded twisted pair.
Verify reliable earthing; single‑point earthing required for relay chassis.
If problems persist, contact ABB authorized service for hardware inspection.
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