Product Name

ABB REX521 GHHGSH05G / REX521 GHHPSH51G Controller

Product Description

The ABB REX521 is a digital protection and control relay designed for medium-voltage applications. It provides comprehensive protection, control, measurement, and monitoring functions for various power system components such as transformers, feeders, and generators. The relay is equipped with advanced algorithms for fault detection and communication capabilities, making it suitable for modern electrical distribution networks.

Product Parameters and Specifications

1. General Specifications:
   • Supply Voltage: 100-240V AC / DC
   • Power Consumption: Typically around 10W
   • Protection Class: IP54 / IP65 (depending on the enclosure)
   • Weight: Approximately 1.5 to 5 kg (depends on the model)
2. Protection Functions:
   • Overcurrent (OC)
   • Earth fault (EF)
   • Directional overcurrent
   • Voltage (under and over)
   • Frequency protection
   • Motor protection (optional)
3. Control Functions:
   • Circuit breaker control
   • Automatic reclosure
   • Interlocking schemes
   • Remote control capabilities
4. Measurement Functions:
   • Current and voltage measurement
   • Power factor
   • Energy metering
   • Disturbance recording
5. Communication Protocols:
   • IEC 61850
   • Modbus RTU/TCP
   • DNP3
6. User Interface:
   • LCD display with configurable parameters
   • Front panel buttons for easy navigation
   • LED indicators for status and alarms
7. Environmental Conditions:
   • Operating Temperature: -25°C to +55°C
   • Humidity: 5 to 95% (non-condensing)

Product Use

The ABB REX521 relays are used primarily in:

• Power Generation: Protection of generators from faults.
• Transformer Protection: Monitoring and protecting transformers against overcurrents and earth faults.
• Distribution Networks: Ensuring reliability in medium-voltage distribution and protecting feeders.
• Industrial Applications: Providing protection for motor-driven systems and machinery.
• Substations: Monitoring and control of equipment in substations, especially in smart grid applications.