ABB REX521GHHPSH06G Numerical Feeder Protection and Control Relay

Description

Technical Specifications

• Product Type
  • Numerical Feeder Protection & Control Relay
• Rated Application Voltage
  • Medium Voltage (MV): 3.3 kV – 36 kV
• Auxiliary Power Supply
  • AC Supply: 110/120/220/240 V AC, ±15%, 50/60 Hz
  • DC Supply: 110/125/220 V DC, ±20%
• Analog Inputs
  • Phase Current Inputs: 3 channels, configurable for 1 A or 5 A nominal secondary current
  • Residual Current Input: 1 channel (5 A / 1 A) for earth-fault detection
  • Voltage Inputs: 3-phase voltage + 1 residual voltage input
  • Sensor Compatibility: Works with conventional CTs/VTs and modern electronic sensors
• Binary Inputs/Outputs
  • Binary Inputs: 16 optically isolated, programmable digital inputs
  • Binary Outputs: 12 change-over relay outputs (8 signal outputs, 4 power trip outputs)
• Communication Interfaces
  • Serial: RS-485 port
  • Local: Front USB port for configuration, diagnostics, and firmware updates
  • Optional: Ethernet port for networked communication
• Supported Communication Protocols
  • Modbus RTU/TCP
  • DNP3.0
  • SPA Bus
  • IEC 60870-5-103
  • Optional IEC 61850
• Physical & Environmental Data
  • Mounting: Standard 19-inch rack-mountable, compact form factor
  • Display: Backlit graphical monochrome LCD with multi-language support
  • User Control: Front-panel navigation buttons with integrated LED status indicators
  • Protection Class: IP40 (front panel), IP20 (rear)
  • Operating Temperature: -25 °C to +70 °C
  • Storage Temperature: -40 °C to +85 °C
  • Humidity: 5 – 95% RH (non-condensing)
  • EMC Compliance: IEC 60255-6, EN 55011, EN 61000-6-2
• Certifications
  • CE, UL, IEC 60255, IEC 61850-3

Key Features

• Comprehensive Feeder Protection Suite
  • Overcurrent Protection: Three-stage, directional/non-directional phase overcurrent protection (3I>, 3I>>, 3I>>>) with selectable Definite Time (DT) and Inverse Definite Minimum Time (IDMT) characteristics.
  • Earth Fault Protection: Sensitive earth-fault (SEF) and directional earth-fault (Io>, Io>>, Io>>>) protection for high-impedance fault detection in all earthing schemes.
  • Voltage & Frequency Protection: Overvoltage, undervoltage, residual overvoltage, phase imbalance, phase reversal, and over/under frequency protection.
  • Advanced Protection Functions: Built-in harmonic restraint to prevent misoperation during transformer inrush. Includes circuit breaker failure protection (CBFP), trip circuit supervision (TCS), and fuse failure detection.
  • Auto-Reclose Function: Multi-shot automatic reclosing (up to 5 cycles) with configurable dead time, reclaim time, and synchronism check.
• High-Precision Measurement & Monitoring
  • Electrical Measurements: Real-time, true RMS measurement of three-phase current/voltage, active/reactive power, energy, power factor, and frequency with high accuracy.
  • Power Quality Analysis: Monitors Total Harmonic Distortion (THD) for current and voltage (1–13th harmonics).
  • Event & Disturbance Recording: Stores 1000+ time-stamped Sequence of Events (SOE). Captures fault waveforms in COMTRADE format for detailed post-fault analysis.
  • Equipment Monitoring: Tracks circuit breaker mechanical wear, operation count, and coil performance.
• Programmable Logic & Control
  • Embedded Logic Controller: IEC 61131-3 compliant programmable logic for custom interlocking, automation, and control schemes.
  • Control Capabilities: Supports local and remote circuit breaker control via front panel or communication network.
  • Flexible Configuration: Pre-defined standard application configurations for rapid deployment. Supports multiple setting groups for adaptive operation.
• Operational Reliability & Security
  • Continuous Self-Supervision: Built-in self-diagnostics monitors hardware and software health, ensuring high availability.
  • Security: Password-protected access and role-based user authentication to prevent unauthorized configuration changes.
  • Easy Integration: Designed for seamless retrofitting into existing switchgear and compatibility with new installations.
• Seamless System Integration
  • Wide Protocol Support: Ensures full interoperability with SCADA, DCS, and substation automation systems (SAS).
  • Remote Access: Enables remote configuration, monitoring, troubleshooting, and firmware updates.

Application Scenarios

• Utility Medium Voltage Distribution
  • Primary protection for overhead lines and underground cable feeders in radial and looped networks.
  • Protection for incoming and outgoing feeders in primary and secondary distribution substations.
  • Suitable for isolated neutral, resonant earthed, solidly earthed, and resistively earthed distribution systems.
• Industrial Power Systems
  • Feeder protection in manufacturing plants, cement factories, and mining operations.
  • Protection for critical motor feeders and large medium-voltage motors (pumps, fans, compressors).
  • Ensures process continuity by providing selective fault isolation in industrial power networks.
• Oil, Gas, and Petrochemical Facilities
  • Reliable protection for distribution feeders in refineries, offshore platforms, and pumping stations.
  • Operates in harsh industrial environments with high EMC immunity.
• Infrastructure & Critical Facilities
  • MV feeder protection in data centers, airports, seaports, and railway electrification systems.
  • Ensures high power availability for critical infrastructure and continuous operations.
• Substation Automation & Backup Protection
  • Functions as a bay controller for feeder bays in digital substations.
  • Provides reliable backup protection for power transformers and high-voltage lines.
• Renewable Energy Grid Connection
  • Protects feeders connecting solar farms, wind parks, and energy storage systems to the main grid.
  • Manages bidirectional power flow with directional protection elements.