Here is the technical parameter introduction for the ABB REJ521 PROTECTION RELAY (Model: REJ521B416BAA) in English:

ABB REJ521B416BAA Protection Relay - Technical Specifications

The ABB REJ521B416BAA is a microprocessor-based protection relay designed for secondary protection in power distribution systems, particularly for earth-fault protection of busbars and feeders in utility substations and industrial applications. Below are its key technical parameters:

1. Core Protection Functions

• Earth-Fault Protection:
  • Low-Set Non-Directional Earth-Fault Stage: Configurable with definite time or inverse definite minimum time (IDMT) characteristics.
  • High-Set Non-Directional Earth-Fault Stage: Supports instantaneous or definite time tripping.
• Circuit-Breaker Failure Protection (CBFP): Monitors circuit-breaker status and initiates backup tripping if the primary breaker fails to operate.
• Directional Earth-Fault Protection: Optional directional feature for enhanced selectivity in complex networks.

2. Operational Characteristics

• Input/Output Configuration:
  • Digital Inputs: Configurable for functions like reset, blocking, lockout reset, and disturbance recorder triggers.
  • Analog Inputs: For current and voltage measurements, supporting multiple CT/VT ratios.
  • Output Contacts: Matrix-based output contacts for flexible signal routing (e.g., trip, alarm, and status indications).
• Measurement Accuracy: High-precision current and voltage measurements with low burden on CTs/VTs.

3. Communication and Interfaces

• HMI (Human-Machine Interface): Alphanumeric LCD display with manoeuvring buttons for local configuration and status monitoring.
• Communication Ports: Supports standard protocols (e.g., Modbus, IEC 60870-5-103) for integration with SCADA/EMS systems.
• Disturbance Recorder: Built-in recorder for fault data storage and post-event analysis.

4. Environmental and Mechanical Specifications

• Operating Temperature: -25°C to +70°C (storage: -40°C to +85°C).
• Humidity: 5% to 95% non-condensing.
• Protection Class: IP65 (for outdoor/industrial use, depending on enclosure).
• Vibration and Shock Resistance: Compliant with IEC 60068-2 standards for harsh environments.
• EMC Compliance: Meets IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions).

5. Power Supply

• Voltage Range: 88–264 VAC/VDC (universal input).
• Power Consumption: Typically < 15 W.
• Redundancy Support: Optional redundant power supply for high availability.

6. Software and Configuration

• Programming Tool: PCM600 (Protection and Control IED Manager) for parameterization, logic configuration, and real-time monitoring.
• Logic Builder: Supports custom logic programming via graphical interface.
• Firmware Upgrades: Field-upgradeable firmware via communication ports.

7. Safety and Certifications

• Self-Supervision: Continuous monitoring of internal health (e.g., hardware, memory, and communication).
• Cybersecurity: Optional encryption and authentication for secure communication.
• Certifications: CE, UL, cUL, and IEC 61850-compliant.

8. Mechanical Dimensions

• Enclosure: Ruggedized design with optional mounting options (DIN rail, panel, or rack).
• Dimensions (W x H x D): Approximately 100 mm x 150 mm x 120 mm (exact dimensions may vary by configuration).
• Weight: ~1.2 kg (depending on accessories).

9. Applications

• Utility Substations: Earth-fault protection for medium-voltage feeders and busbars.
• Industrial Power Distribution: Protection of motors, generators, and transformers.
• Renewable Energy Integration: Wind/solar farm feeder protection.

10. Additional Features

• Auto-Reclosing: Configurable reclosing logic for transient faults.
• Synchronism Check: For safe reclosing of breakers.
• Power Quality Monitoring: Voltage sag/swell detection.

The ABB REJ521B416BAA is a versatile, high-performance protection relay designed for reliability and flexibility in demanding power distribution applications. Its advanced features, robust design, and compliance with international standards make it suitable for both traditional and modern smart grid environments.

For detailed technical documentation or configuration support, refer to ABB’s official product manuals or contact ABB’s technical support team.