ABB REJ601 BD446NN1XG Digital Protection Relay (Multifunctional)

ABB REJ601 BD446NN1XG – Technical Overview

Product Type:
Digital Protection Relay (Multifunctional)

Primary Application:
Designed for power system protection in medium/high-voltage networks, including:

• Overcurrent & Earth Fault Protection (directional/non-directional)
• Voltage Protection (over/under voltage, frequency, phase unbalance)
• Motor Protection (starting supervision, thermal overload)
• Feeder Protection in industrial grids or utility substations.

Key Features:

1. Modular Design:
   • Supports flexible configuration via plug-in modules (e.g., communication, I/O).
   • BD446NN1XG suffix may indicate specific hardware variants (e.g., communication protocols or input types).
2. Protection Functions:
   • Multiple protection stages with independent settings.
   • Advanced logic capabilities (FlexLogic™) for customizing protection schemes.
3. Communication & Integration:
   • Protocols: IEC 61850, Modbus RTU/TCP, DNP3.0, or Profibus (varies by variant).
   • Integration with SCADA/EMS via Ethernet or serial ports.
4. Measurement & Monitoring:
   • Real-time RMS values (current, voltage, power, harmonics).
   • Event recording (COMTRADE format) and disturbance logging.
5. Hardware Specifications:
   • Power Supply: 24–250 V DC/AC (wide range).
   • Inputs: 
     • Analog: Up to 5A/1A CT inputs, 110V/230V VT inputs.
     • Digital: 8–16 binary inputs (status signals).
   • Outputs: 
     • Relay contacts (trip/alarm), configurable as NO/NC.
   • Isolation: 4 kV between circuits.
6. Environmental Ratings:
   • Operating Temperature: -25°C to +70°C.
   • Certifications: IEC 60255, UL 508, CE, and IEC 61000-6 for EMC immunity.
7. Human-Machine Interface (HMI):
   • LCD display with local control buttons.
   • Configurable via PCM600 software (ABB’s configuration tool).

Typical Use Cases

• Industrial Plants: Protecting motors, transformers, and feeders.
• Renewable Energy: Grid integration of solar/wind farms.
• Utility Networks: Substation automation and fault isolation.

Advantages

• High Reliability: Redundant power supply and self-supervision.
• Cybersecurity: Supports role-based access and protocol encryption.
• Retrofit Compatibility: Can replace legacy relays with minimal reengineering.