Description
Technical Specifications
- Product Model: REX521GHHGSH51G
- Brand: ABB
- Warranty: One Year
- Input Voltage: 80‑265 V AC/DC auxiliary supplyABB Group
- Operating Temperature: -20 °C to +60 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: ≤35 ms primary trip time
- Protection Class: IP40 (front panel)
- Accuracy Class: Class 0.5 for metering measurements
- Output Frequency: 50 / 60 Hz
- Rated Current Range: 1‑5 A CT secondary input
- Communication Interface: Rear‑mounted Ethernet and serial terminal ports
- Supported Protocols: IEC 61850, Modbus TCP, SPA, DNP3
- Overload Capacity: 20× rated current for 1 second
- Dimensions: 226 mm × 122 mm × 235 mm
Product Overview
The ABB REX521GHHGSH51G is a multifunctional numerical feeder and motor protection relay built for medium‑voltage electrical distribution networksABB Group. This hardware integrates protective tripping logic, electrical measurement, circuit‑breaker control, fault recording and event logging within one compact panel‑mount unit. It addresses common MV‑network pain points including uncoordinated protection tripping, limited fault diagnostic data, and fragmented substation control hardware. Protection engineers, substation integrators and maintenance teams gain operational value from this relay, as it consolidates multiple discrete protection functions into one device, reduces cabinet hardware count and delivers timestamped fault records for post‑incident analysis. It supports standard current‑voltage transformer inputs and works with solidly‑earthed, isolated and resonant‑grounded network configurations, fitting both new substation builds and legacy‑panel retrofits without extensive cabinet reworkABB Group.
Application Scenarios
- Medium‑Voltage Substation Feeder Protection: Deployed for incoming and outgoing feeder circuits inside MV substations. It applies directional‑overcurrent and ground‑fault protection to isolate short‑circuit and earth‑fault events rapidly, limiting equipment damage and confining power outages to only the affected circuit.
- Large‑Medium AC Motor Drive Protection: Installed for circuit‑breaker‑controlled medium‑voltage motor feeders. Thermal overload, start‑up supervision and phase‑unbalance protection prevent motor winding burnout during locked‑rotor, cyclic‑load or supply‑disturbance operating conditionsABB Group.
- Legacy Substation Retrofit Upgrades: Replaces older discrete electromechanical protection relays. Pre‑configured protection profiles shorten commissioning time, while built‑in communication links enable integration with existing SCADA monitoring systems without full‑scale substation replacement.
- Backup Transformer Protection: Operates as secondary backup protection for distribution power transformers. It provides overcurrent and earth‑fault tripping if primary transformer protection fails to respond to network faults
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