ABB REX521GHHGSH51G Multifunctional Medium‑Voltage Feeder‑Protection Relay

Product Description

Technical Specifications

• Full Model: REX521GHHGSH51G
• Brand: ABB, Origin: Finland
• Product Series: REX521 Relion feeder‑protection relay
• Auxiliary Working Power:100‑240 VAC / 100‑240 VDC wide‑range power‑supply
• Rated Current Transformer Input: 1 A /5 A configurable
• Applicable Grid Frequency:50 Hz & 60 Hz
• Built‑in Protection Logic: Three‑stage over‑current, directional/non‑directional earth‑fault, thermal overload, phase‑failure, over‑voltage and under‑voltage protection
• Communication Interfaces: RS485 serial port, supporting IEC‑60870‑5‑103, Modbus‑RTU
• Local Operation: LCD display, physical setting buttons and status‑indicator LEDs
• Power Consumption: ≤10 W
• Operating‑Temperature:‑20℃ ~ +70℃
• Storage‑Temperature:‑40℃ ~ +85℃
• Ambient Humidity:5%–95% non‑condensing industrial‑grade
• Front‑panel Protection Grade: IP54
• Installation: Panel flush‑mount installation for medium‑voltage switch‑cabinets
• Net Weight: Approx.1.5 kg
• Certifications: CE, UL, RoHS‑compliant, power‑system EMC certification

Key Features

1. Complete‑set customizable protection algorithms adapted to multiple types of neutral‑earthing medium‑voltage power‑networks.
2. Accurate real‑time measurement for three‑phase voltage, current, active‑power, reactive‑power and harmonic‑content monitoring.
3. Time‑stamped fault‑event log storage for post‑failure troubleshooting and power‑grid‑fault analysis.
4. Standard serial‑field‑bus interfaces for data‑interaction with substation upper monitoring‑system.
5. Compact integrated‑panel structure with straightforward local parameter‑setting and alarm inquiry.
6. Circuit‑breaker trip‑circuit monitoring function improves the reliability of protection‑actuating loops.
7. Multi‑language text‑based alarm prompts simplify on‑site maintenance‑workers’ operation.
8. Strong anti‑electromagnetic‑interference performance to adapt to harsh high‑voltage‑switch‑gear cabinet‑site surroundings.