ABB REX521GHHPSH07G Feeder and Motor Protection Relay

Description

Technical Specifications

Power Supply

• Auxiliary Voltage: 100–240 V AC/DC (±15% tolerance), wide-range input
• Frequency: 50/60 Hz (dual-frequency compatible)
• Power Consumption: 10 W (typical)

Analog Inputs

• Current Inputs: 3×phase current inputs (1 A or 5 A nominal CTs), 1×residual current input
• Voltage Inputs: 3×phase voltage inputs (100–120 V nominal VTs), 1×residual voltage input
• Sensor Compatibility: Supports conventional CT/VT and non-conventional current/voltage sensors
• Input Isolation: 2500 V rms galvanic isolation between all analog inputs

Digital Inputs/Outputs

• Digital Inputs: 16×optically isolated binary inputs (24–250 V DC/AC)
• Trip Outputs: 4×high-speed relay outputs (changeover contacts) for fault tripping
• Control Outputs: 8×general-purpose relay outputs for signaling and control
• Contact Rating: 5 A at 250 V AC / 30 V DC (resistive load)

Communication Interfaces

• Serial Ports: 2×RS-485 ports (galvanically isolated)
• Supported Protocols: Modbus RTU, DNP3.0, SPA communication protocols
• Optical Ports: Optional fiber-optic ports for noise-immune long-distance communication
• Time Synchronization: IRIG-B, SNTP network time synchronization

Display & HMI

• Display: 128×64 pixel monochrome LCD with backlight
• Controls: 8×front-panel pushbuttons for local operation and configuration
• Indicators: 12×LED indicators for power, operation, fault, and alarm status
• Interface: Local parameter setting, fault data viewing, and operation log access

Physical & Environmental

• Mounting: Panel-mounted (144 mm × 144 mm standard cut-out)
• Dimensions: 144 mm (W) × 155 mm (H) × 120 mm (D)
• Weight: 1.8 kg (approximate)
• Operating Temperature: -25°C to +70°C
• Storage Temperature: -40°C to +85°C
• Humidity: 5–95% non-condensing
• Protection Rating: Front panel IP40, rear IP20
• Certifications: IEC 60255, IEC 61850 (via adapter), CE, UL, EMC compliant

Performance

• Sampling Rate: 1.6 kHz per channel
• Trip Time: <30 ms (overcurrent protection)
• Fault Recording: 8×analog channels, 16×binary channels
• Event Logging: 500+ time-stamped events with 1 ms resolution
• Measurement Accuracy: Current/voltage: ±0.2%, power/energy: ±0.5%

Key Functional Features

Comprehensive Feeder Protection

• Overcurrent Protection: Three-stage phase overcurrent (50/51) with definite and inverse time characteristics
• Earth Fault Protection: Sensitive residual overcurrent (50N/51N), directional earth fault (67N)
• Voltage Protection: Two-stage overvoltage (59), two-stage undervoltage (27), residual overvoltage (59G)
• Frequency Protection: Overfrequency (81O), underfrequency (81U), frequency rate-of-change protection
• Automatic Reclosing: Up to 5-shot auto-reclose with programmable dead time and reclaim time
• Fuse Failure Protection: Detects blown VT fuses and blocks voltage-dependent functions

Advanced Motor Protection

• Thermal Overload Protection: Precise thermal model for stator and rotor windings (49)
• Start-Up Supervision: Monitors motor start time, locked rotor condition, and start attempt limits
• Stall Protection: Detects motor stall during operation and initiates rapid tripping
• Phase Unbalance Protection: Detects negative-sequence current and phase loss conditions
• Reverse Phase Protection: Prevents motor operation with incorrect phase sequence
• Underload Protection: Detects broken belts or uncoupled loads (motor dry-running)

Control & Automation

• Local/Remote Control: Circuit breaker trip/close control with local/remote selection
• Interlocking Logic: Programmable logic for safety interlocks and operational sequences
• Setting Groups: 4×configurable setting groups for flexible operational mode switching
• Sequence of Events: Captures breaker operations and fault events with high time resolution

Measurement & Monitoring

• Precision Metering: True RMS measurement of current, voltage, power (active/reactive/apparent), energy, power factor, frequency
• Continuous Supervision: Trip circuit supervision, breaker wear monitoring, CT/VT integrity check
• Self-Diagnostics: Continuous hardware/software monitoring with pre-alarm and fault indication
• Oscillography: Fault waveform recording for post-incident analysis

System Integration

• Multi-Protocol Support: Seamless integration with SCADA and substation automation systems
• Legacy Compatibility: Works with existing control systems via standard serial protocols
• Remote Access: Parameter setting, fault analysis, and status monitoring via communication network
• Configuration Tools: PC-based software for parameter configuration, logic programming, and diagnostics

Application Scenarios

Medium-Voltage Distribution Networks

• Distribution Substations: Primary protection for incoming and outgoing feeders
• Radial Networks: Protection for radial isolated neutral, resonant earthed, and resistively earthed systems
• Single Busbar Systems: Main protection for feeders in compact substation layouts
• Urban/Rural Grids: Feeder protection in municipal and rural power distribution networks

Industrial Motor Control

• Pumps & Fans: Protection for large water pumps, ventilation fans, and centrifugal compressors
• Conveyors & Mills: Motor protection for mining conveyors, grinding mills, and material handling systems
• Compressors & Blowers: Protection for industrial air compressors and process blowers
• Manufacturing Lines: Motor feeders in automotive, textile, and general manufacturing plants

Power Generation Plants

• Auxiliary Systems: Protection for generator auxiliary motors and plant feeders
• Cogeneration Plants: Medium-voltage feeder and motor protection in combined heat and power plants
• Renewable Plants: Collector feeder protection in solar and wind power facilities

Oil & Gas Industry

• Refineries: Motor protection for pumps, compressors, and process drive motors
• Offshore Platforms: Feeders and motor protection in marine and offshore applications
• Pipelines: Compressor station motor and distribution feeder protection

Water & Wastewater

• Water Treatment: Protection for pump motors and process feeders
• Wastewater Plants: Aeration blower and sludge pump motor protection
• Irrigation Systems: Large pump station feeder and motor protection

Mining & Minerals

• Mineral Processing: Crusher, mill, and conveyor motor protection
• Open-Pit Mining: Shovel, dragline, and pumping system motor protection
• Underground Mining: Flameproof-compatible feeder and motor protection

Marine & Offshore

• Shipboard Systems: Marine-certified protection for main and auxiliary motors
• Offshore Vessels: Feeders and thruster motor protection in dynamic positioning systems
• Naval Applications: Military vessel medium-voltage motor and feeder protection