ABB REX521GHHGSH51G Numerical Protection and Control Relay

Key Features and Functional Highlights

• Comprehensive Protection Functions: Integrates a wide array of protection schemes including three-stage overcurrent protection, directional and non-directional earth fault protection, thermal overload protection, broken conductor protection, and frequency protection.
• Advanced Automation and Control: Capable of controlling circuit breakers (close, trip, spring charge), executing auto-reclosing sequences (up to 5 shots), and managing complex interlocking logic to prevent operational errors.
• High-Precision Metering: Provides accurate measurement of electrical parameters such as phase currents, voltages, active and reactive power, energy, and power factor. It also monitors power quality by measuring total harmonic distortion (THD) and unbalance.
• IEC 61850 Native Support: Fully compliant with IEC 61850 Edition 2, supporting GOOSE (Generic Object Oriented Substation Event) for fast peer-to-peer communication and Sampled Values (SV) for process bus applications over fiber optics.
• Network Redundancy: Supports high-availability protocols such as HSR (High-availability Seamless Redundancy) and PRP (Parallel Redundancy Protocol) to ensure zero-time recovery in case of network failures.
• Precise Time Synchronization: Features support for IEEE 1588 v2 (PTP), SNTP, and IRIG-B for high-precision time synchronization across the substation, crucial for event sequencing and fault analysis.
• Condition Monitoring and Self-Supervision: Continuously monitors the health of the relay, including trip circuit integrity, CT/PT circuit status, and internal diagnostics. It also provides circuit breaker wear monitoring based on electrical stress.
• User-Friendly Interface: Equipped with a high-resolution graphical LCD display showing customizable single-line diagrams (SLD), oscillographic records, and event logs. The interface supports multiple languages and can be accessed via a front panel or web browser.

Technical Specifications

• Product Family: Relion® 600 Series Numerical Relays
• Application: Medium Voltage Feeders and Motors (Typically 11kV to 36kV)
• Protection Functions:
  • ANSI 50/51: Three-stage phase and earth fault overcurrent protection (instantaneous and time-delayed).
  • ANSI 67: Directional overcurrent protection.
  • ANSI 49: Thermal overload protection (simulates motor heating).
  • ANSI 46: Negative sequence protection (phase failure/unbalance).
  • ANSI 27/59: Undervoltage and overvoltage protection.
  • ANSI 81: Underfrequency and overfrequency protection with rate-of-change detection.
  • ANSI 79: Auto-reclosing control.
  • ANSI 50BF: Breaker failure protection.
• Communication Ports:
  • Primary: 2x 10/100/1000 Mbps Ethernet ports (RJ45) supporting IEC 61850-8-1 (GOOSE, MMS).
  • Secondary: RS-485 for Modbus RTU/ASCII, DNP3.0, and IEC 60870-5-103.
  • Optical: Fiber optic port for IEC 61850-9-2 LE (Sampled Values).
• Inputs and Outputs:
  • Analog Inputs: 3 phase currents (1A/5A nominal), residual current, 3 phase voltages (110V/100V nominal).
  • Digital Inputs: Configurable binary inputs for status monitoring (e.g., breaker position, trip commands).
  • Digital Outputs: Relay outputs for tripping and indication (typically 4-6 outputs).
• Power Supply: Universal supply range, typically 24V to 250V DC or 110V to 240V AC.
• Environmental Standards:
  • Operating Temperature: -40°C to +70°C.
  • EMC Compliance: IEC 61000-4 series (Surge, ESD, Burst).
  • Enclosure: IP40 rating for front panel, withdrawable design for cubicle mounting.
• Data Recording: Integrated disturbance recorder with high sampling frequency (e.g., 2 kHz at 50Hz) to capture pre-fault and post-fault data for root cause analysis.

Application Scenarios

The ABB REX521 is widely deployed in sectors requiring high reliability and advanced automation:

• Utility Substations: Protection of incoming and outgoing feeders in secondary distribution networks, including radial and ring-main configurations.
• Industrial Manufacturing: Safeguarding motors driving pumps, conveyors, crushers, and compressors, as well as protecting plant incoming feeders.
• Renewable Energy: Protection of collector systems in wind farms and solar parks, including interconnection feeders to the grid.
• Mining and Metals: Heavy-duty protection for crushers, mills, and processing equipment operating at medium voltage.
• Infrastructure: Medium voltage switchgear in commercial complexes, airports, and data centers.
• Railway Traction: Protection of feeders in electric railway power supply systems.

Ordering Information for REX521GHHGSH51G

The specific order number REX521GHHGSH51G defines a unique hardware and feature configuration within the REX521 series. While the exact breakdown is proprietary to ABB’s configuration system, the structure generally follows this pattern:

• REX521: Identifies the product family as a feeder and motor protection relay.
• GHHG: This segment typically defines the Hardware Platform and Protection Application. “GH” often indicates a specific generation of the Relion 600 series hardware with a withdrawable unit design. “HG” usually specifies the protection package, likely including comprehensive feeder protection functions (overcurrent, earth fault, voltage) and advanced control logic.
• SH51: This part usually denotes the I/O and Communication Configuration. “S” might indicate a specific set of analog inputs (e.g., 3I + Io, 3V). “H51” often refers to the inclusion of high-speed communication modules, such as dual Ethernet ports for IEC 61850 GOOSE messaging, and a specific count of digital inputs/outputs.
• G: This suffix often relates to Special Features or Regional Standards. In many ABB part numbers, a trailing “G” can indicate a configuration tailored for specific markets (e.g., Chinese market configurations often have unique part numbers for local standards) or the activation of specific advanced logic schemes like arc protection or specialized metering profiles.