ABB REX521GHHPSH50G Feeder Protection Relay

ABB REX521GHHPSH50G Relion Feeder Protection Relay with IEC 61850 Communication

The ABB REX521GHHPSH50G Feeder Protection Relay represents advanced protection technology within ABB's Relion series, delivering comprehensive multi-function protection for distribution feeders, industrial networks, and utility substations. Engineered with overcurrent, earth fault, directional, arc protection, and IEC 61850 communication, this relay provides reliable fault detection, isolation, and system coordination across medium-voltage electrical networks in utilities, industrial facilities, and renewable energy installations worldwide.

Core Technical Specifications

• Protection Functions: Overcurrent (50/51), earth fault (50N/51N), directional (67/67N), arc protection
• Voltage Rating: Suitable for medium-voltage applications up to 36 kV
• Current Inputs: 1A or 5A nominal with wide dynamic range
• Voltage Inputs: Phase and residual voltage measurement
• Communication Protocols: IEC 61850, Modbus, DNP3, IEC 60870-5-103
• Control I/O: Binary inputs, relay outputs for breaker control and signaling
• Metering Functions: Current, voltage, power, energy, power factor measurement
• Event Recording: Fault recorder with waveform capture and sequence of events
• Display: Graphical LCD with local HMI for configuration and diagnostics
• Operating Temperature: -40°C to +70°C extended industrial range
• Mounting: Panel or rack mounting in standard relay panels
• Compliance: IEC 60255, IEEE C37.90, ANSI protection standards

Advanced Protection Capabilities

The REX521GHHPSH50G incorporates sophisticated protection algorithms and coordination features essential for reliable feeder protection in modern electrical networks:

• Multi-Stage Overcurrent Protection: Independent definite-time and inverse-time overcurrent elements (ANSI 50/51) with selectable curves (IEC, IEEE, ANSI) enable coordinated protection from distribution substation to industrial loads
• Sensitive Earth Fault Detection: Dedicated earth fault elements (50N/51N) with residual current measurement detect high-impedance ground faults invisible to phase overcurrent protection, preventing equipment damage and personnel hazards
• Directional Protection: Directional overcurrent and earth fault elements (67/67N) distinguish forward and reverse faults in looped networks, enabling selective tripping and maintaining service continuity to unfaulted sections
• Arc Flash Protection: High-speed arc detection with light sensors and overcurrent supervision provides sub-cycle fault clearing, minimizing arc flash energy and protecting personnel and equipment
• Adaptive Protection: Load-dependent protection settings automatically adjust sensitivity based on operating conditions, preventing nuisance trips during cold-load pickup while maintaining fault sensitivity
• Breaker Failure Protection: Integrated breaker failure logic initiates backup tripping when primary breaker fails to clear fault, ensuring fault isolation and system stability

Distribution Network Applications

This feeder protection relay addresses critical protection requirements across diverse electrical distribution applications where reliable fault detection and isolation directly impact service reliability and equipment preservation:

• Utility Distribution Feeders: Protects overhead and underground distribution circuits from substations to customer loads with coordinated overcurrent, reclosing, and fault location capabilities reducing outage duration and improving reliability indices
• Industrial Plant Distribution: Safeguards medium-voltage feeders supplying motors, transformers, and process loads in manufacturing facilities with selective coordination preventing plant-wide shutdowns from localized faults
• Renewable Energy Integration: Protects collector feeders in wind farms and solar plants with directional elements managing bidirectional power flow and anti-islanding protection for grid-connected generation
• Mining Operations: Provides robust protection for mobile substations and trailing cables in underground and surface mining with arc flash protection addressing confined-space hazards
• Data Center Power Distribution: Ensures high-availability power delivery with fast fault clearing, selective coordination, and comprehensive metering supporting critical IT infrastructure
• Marine and Offshore Platforms: Protects shipboard and offshore electrical systems with environmental hardening, vibration resistance, and salt-spray protection for harsh maritime conditions
• Railway Traction Systems: Safeguards traction power feeders with specialized protection adapted for DC and AC railway electrification systems

IEC 61850 Substation Automation Integration

The REX521GHHPSH50G integrates seamlessly within IEC 61850-based substation automation architectures, communicating with SCADA systems, bay controllers, and peer relays via Ethernet networks. The relay publishes GOOSE messages for high-speed peer-to-peer protection signaling, subscribes to sampled values for process bus applications, and supports MMS client-server communication for remote configuration and monitoring. Integration with ABB's PCM600 engineering tool enables centralized relay management, protection coordination studies, and cybersecurity configuration.

Engineering Design Excellence

• Cybersecurity Features: Role-based access control, encrypted communication, audit logging, and IEC 62351 compliance protect against unauthorized access and cyber threats in connected substations
• Self-Monitoring Diagnostics: Continuous self-testing of measurement circuits, protection logic, and communication interfaces with automatic alarm generation ensures relay availability and functional integrity
• Flexible I/O Configuration: Programmable binary inputs and relay outputs enable custom control schemes, interlocking logic, and integration with auxiliary equipment without external logic controllers
• Disturbance Recording: High-resolution fault recorder captures voltage and current waveforms with pre-fault and post-fault data supporting detailed fault analysis and protection performance evaluation
• Hot-Swappable Design: Front-accessible connections and configuration storage enable relay replacement without de-energizing circuits or losing settings, minimizing maintenance outages
• Extended Service Life: Industrial-grade components and rigorous environmental testing ensure >20-year operational life matching substation equipment lifecycles

Installation & Commissioning

The relay installs in standard 19-inch relay panels with panel or rack mounting options. CT and VT connections utilize rear-panel terminals with proper polarity marking and test blocks for commissioning. Configuration involves protection setting calculation, I/O mapping, communication setup, and coordination verification—typically completed in 4-6 hours using PCM600 software. Commissioning includes primary and secondary injection testing, GOOSE message verification, and integration testing with substation automation systems.

Quality Standards & Compliance

Manufactured under ISO 9001:2015 quality management systems with complete component traceability and type testing per international standards. Complies with IEC 60255 protective relay standards, IEEE C37.90 relay performance specifications, and IEC 61850 substation automation protocols. Meets CE electromagnetic compatibility directives, UL recognition for industrial control equipment, and seismic qualification per IEEE 693. Suitable for installation in utility substations, industrial facilities, and critical infrastructure applications.

Related Products for Complete Protection Solutions

Why Choose Industrial Control Hub?

We specialize in delivering factory-certified authentic ABB Relion protection relays with comprehensive technical documentation, protection engineering support, and expedited global logistics. Our power system specialists provide pre-sale consultation to ensure optimal relay selection, protection coordination studies, and IEC 61850 integration design for your specific substation requirements. Post-sale support includes commissioning assistance, relay testing procedures, and lifecycle maintenance planning to maximize system reliability and regulatory compliance.

Product Authenticity: Factory-certified genuine ABB components with serialized traceability and anti-counterfeit verification
Technical Expertise: Certified protection engineers (PE, NETA) for coordination studies and relay commissioning
Express Logistics: Priority shipping to critical utility and industrial facilities with customs documentation
Warranty Coverage: Comprehensive manufacturer-backed warranty with extended protection and rapid replacement options
Documentation Suite: Complete technical manuals, protection settings files, PCM600 configuration tools, and test reports

© 2025 INDUSTRIAL CONTROL HUB. All rights reserved.
Original Source: https://www.indctrlhub.com
Contact: sales@indctrlhub.com | +0086 18359243191