ABB REX521GHHPSH50G Feeder Protection Relay

Description

Technical Specifications

• Product Type: Digital Feeder and Motor Protection Relay
• Application Scope: Medium-voltage (MV) power distribution systems
• Auxiliary Power Supply: 100–240 V AC/DC, wide voltage range
• Power Consumption: Approximately 10 W
• Input Interface:
  • Compatible with conventional current transformers (CTs) and voltage transformers (VTs)ABB Group
  • Supports electronic current and voltage sensor inputsABB Group
  • 9 digital input channels
• Output Interface:
  • 1 high-speed power output
  • 3 power outputs
  • 2 signal outputs
  • 1 IRF output
  • 1 trip circuit supervision interface
• Communication Protocols:
  • IEC 61850
  • Modbus RTU/Modbus TCP
  • DNP3.0
  • SPA, LON serial protocols
• Environmental Ratings:
  • Operating Temperature: -40°C to +70°C
  • Storage Temperature: -40°C to +85°C
  • Humidity: 5–95% non-condensing
  • EMC Compliance: IEC/EN 61000-6-2, IEC/EN 61000-6-4
• Physical Characteristics:
  • Weight: Approximately 3 kg
  • Protection Class: IP54
  • Construction: Rugged metal enclosure
• Certifications: CE, UL certified

Key Features

Comprehensive Protection Functions

• Three-Phase Overcurrent Protection: Three-stage (3I>, 3I>>, 3I>>>) non-directional and directional (67) protection, supporting definite time (DT) and inverse definite minimum time (IDMT) characteristics.
• Ground Fault Protection: Three-stage (Io>, Io>>, Io>>>) directional (67N) and non-directional protection.
• Voltage Protection: Overvoltage (3U>), undervoltage (3U<<), residual voltage (Uo>), voltage imbalance, and phase sequence protection.
• Frequency Protection: Overfrequency, underfrequency, and frequency loss protection.
• Motor-Specific Protection: Thermal overload protection with built-in thermal model, motor start-up monitoring, phase reversal protection, and fuse failure detection.
• Advanced Features:
  • Harmonic suppression and transformer inrush current detection (3I2f>) to prevent maloperation.
  • Circuit breaker failure protection.
  • Up to 5 auto-reclose sequences with configurable dead time and discrimination time.

Precision Measurement & Monitoring

• Real-time measurement of three-phase current, voltage, active/reactive power, power factor, frequency, and energy consumption.
• Supports true RMS and fundamental wave analysis.
• Power quality monitoring including total harmonic distortion (THD) analysis.
• Circuit breaker wear monitoring and trip circuit supervision.
• Event recording with disturbance recorder (DREC) function to capture fault waveforms for analysis.

Flexible Communication & Control

• Multi-protocol support for seamless integration into SCADA, DCS, and substation automation systems.
• Remote control capabilities for start/stop operations, parameter setting, and fault reset.
• Password-protected configuration to prevent unauthorized access.
• User-defined logic for customized protection and control schemes.

User-Friendly Interface

• Backlit LCD graphical display with multi-view functionality (real-time data, event logs, settings).
• Front-panel navigation buttons and LED status indicators (READY, TRIP, ALARM).
• Multi-language support for global deployment.

Application Scenarios

• Utility Power Distribution Substations:
  • Primary protection for incoming and outgoing overhead lines and underground cable feeders in primary and secondary substations.
  • Ensures selective fault isolation to minimize outage areas, improving SAIDI/SAIFI reliability indices.
• Industrial Power Systems:
  • Protection for medium and large three-phase AC motors in manufacturing plants, refineries, and mining operations.
  • Safeguards critical processes such as pumps, fans, compressors, and conveyors requiring continuous operation.
  • Provides robust performance in high electromagnetic interference industrial environments.
• Transformer & Line Backup Protection:
  • Acts as backup protection for power transformers and main high-voltage line protection relays.
  • Enhances overall power system security by providing redundant protection layers.
• Renewable Energy Integration:
  • Protects feeders connecting solar farms, wind parks, and energy storage systems to the utility grid.
  • Manages bidirectional power flow with directional protection elements, complying with grid interconnection standards.
• Infrastructure & Critical Facilities:
  • Ensures reliable power distribution in airports, seaports, data centers, and rail electrification systems.
  • Supports 24/7 operations with high availability and rapid fault diagnostics.
• System Retrofit & Modernization:
  • Ideal for upgrading legacy substations to modern digital protection and communication standards.
  • Extends the operational life of existing medium-voltage infrastructure with advanced features.