ABB REX521GHHGSH05G Integrated Protection Relay

Product Introduction
The ABB REX521GHHGSH05G is a high-performance integrated protection relay designed for comprehensive protection, measurement, monitoring, and control in medium-voltage power distribution systems. It is specifically tailored for feeders and large/medium-sized three-phase AC motors, ensuring reliable operation and minimizing downtime. The relay integrates advanced protection functions with flexible configuration options, making it suitable for various grounding systems, including isolated neutral, resonance grounded, solidly grounded, and low-resistance grounded networks.

Category:
Description

Technical Specifications

  • Rated Voltage: Up to 72 kV (via external CT/VT)
  • Rated Current: 1 A/5 A nominal (external CT)
  • Frequency Range: 45-65 Hz
  • Auxiliary Power Supply: 88-265 V AC / 100-250 V DC
  • Sampling Rate: 2 kHz for analog signals (when system frequency is 50 Hz)
  • Input Points: 10 kHz collect open-circuit input points
  • Communication Protocols: Supports IEC 60870-5-103, Modbus RTU/ASCII, DNP3.0, LON, and SPA protocols via optical fiber interface. RS-485 interface supports Modbus RTU/ASCII, DNP3.0, and SPA protocols.
  • Display: 4×8 character LCD with directional navigation keys and three status indicator LEDs.
  • Operating Temperature: -20°C to +70°C (display) / -40°C to +70°C (device)
  • Enclosure Rating: Front IP52, Rear IP30
  • Dimensions: 177 x 265 x 225 mm (H x W x D)
  • Weight: Less than 5 kg

Functional Characteristics

  • Comprehensive Protection Functions:
    • Overcurrent protection (phase and ground)
    • Overvoltage and undervoltage protection
    • Thermal overload protection for motors
    • Phase imbalance and reverse phase sequence protection
    • Frequency protection (underfrequency and overfrequency)
    • Voltage unbalance and negative sequence protection
    • Fuse failure protection
    • Breaker wear monitoring
    • Auto-reclosing (up to 5 attempts)
  • Advanced Monitoring and Diagnostics:
    • Real-time monitoring of current, voltage, frequency, power factor, and energy consumption.
    • Fault location and recording with five analog input channels and up to sixteen switch input channels.
    • Event logging and alarm management for proactive maintenance.
    • Measurement of total harmonic distortion (THD) for power quality monitoring.
  • Flexible Configuration and Scalability:
    • Multiple standard configurations (e.g., H50, H51) to meet diverse application requirements.
    • Graphical configuration and logic expansion using CAP501/CAP505 software.
    • Modular design with plug-in units for easy installation, replacement, and testing.
  • High Reliability and Redundancy:
    • Supports parallel redundancy protocol (PRP) and high-availability seamless redundancy (HSR) for zero-interruption operation.
    • Self-diagnostic functions to detect internal faults and issue warnings before failure occurs.
  • User-Friendly Interface:
    • Intuitive HMI with large LCD screen and directional keys for local operation and monitoring.
    • Free CAP501 software for comprehensive relay information access and protection setting adjustments.
    • Front panel RS-232 optical isolation interface for easy connection to PCs for backend settings.

Application Scenarios

  • Power Distribution Systems: Protection of feeders, cables, and distribution substation busbars in utility and industrial networks.
  • Industrial Automation: Safeguarding critical equipment in cement, metallurgy, petrochemical, automotive, semiconductor, paper, and tobacco industries.
  • Renewable Energy: Integration of distributed generation sources, such as solar and wind farms, with flexible grounding configurations.
  • Infrastructure Projects: Application in municipal, airport, port, and real estate sectors for reliable power supply and management.
  • Smart Grid Solutions: Integration into smart grid architectures for advanced monitoring, control, and automation of electrical networks.
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