Email: sales@runshengdcs.com
WhatsApp / Wechat：+86 15383419322
Phone：+86 15383419322Description
The ABB REX521GHHPSH07G is a microprocessor-based generator protection relay engineered for medium-to-large power generation assets (1-100 MVA). As part of ABB’s Relion® 521 series, this specialized “GHHPSH07G” variant integrates comprehensive generator protection, synchronization, and condition monitoring in a single 19″ rack-mount unit. Designed for hydro/thermal plants and industrial cogeneration, the ABB REX521 features advanced algorithms for stator differential (87G), loss-of-excitation (40), reverse power (32), and 100% stator earth fault protection (64G1). Its dual-processor architecture executes protection logic within 1.5 cycles while supporting IEC 61850 Ed.2, Modbus TCP, and IEC 60870-5-103 communications. With extended operational temperature (–40°C to +70°C) and 5g vibration resistance, the REX521GHHPSH07G ensures grid code compliance in the most demanding environments.
ABB REX521GHHPSH07G
Technical Specifications
| Parameter | Value |
| Product Model | REX521GHHPSH07G |
| Manufacturer | ABB |
| Product Type | Generator Protection Relay |
| Rated Inputs | 3-phase VT: 100-120V AC, CT: 1/5A; DC Supply: 48-250V DC |
| Protection Functions | Stator Diff (87G), Loss-of-Excitation (40), Reverse Power (32), Overexcitation (24), 100% Stator EF (64G1) |
| Synchronization | Auto-sync (25) with <2° phase error |
| Communication | 2x Ethernet (IEC 61850-8-1/9-2LE), RS-485 (Modbus/103), USB |
| Binary I/O | 18 DI (24V DC), 12 DO (5A @ 250V AC) |
| Measurement Accuracy | ±0.5% (V/I), ±0.2° (phase) |
| Operating Temperature | –40°C to +70°C |
| Vibration Resistance | 5g @ 10-150Hz (IEC 60255-21-1) |
| Dimensions | 177 x 204 x 147 mm (HxWxD) |
| Certifications | IEC 60255, IEEE C37.90, SIL 3 |
Main Features and Advantages
Adaptive protection philosophy:
Harmonic restraint in differential protection prevents maloperation during CT saturation
Multi-stage overexcitation with inverse-time V/Hz curves protects against core saturation
Embedded synchronization checks voltage, frequency, and phase sequence before closing
Grid resilience:
Inertia-based load ramping maintains stability during islanding transitions
ROCOF (Rate-of-Change-of-Frequency) detection for under-frequency load shedding
Cyber-secure architecture:
Hardware-enforced secure boot (IEC 62443-4-1)
Role-based access control with audit trails compliant with NERC CIP
Application Field
The ABB REX521GHHPSH07G secures critical generation assets:
Hydroelectric Plants: Protects against stator ground faults in 20kV hydro generators with variable speed operation
Industrial CHP: Manages anti-motoring protection for gas turbines during grid faults
Marine Power: Ensures seamless transition between gensets using integrated auto-synchronization
Mining: Withstands 5g vibration in diesel generator rooms for emergency power systems
Data Centers: Implements <2ms reverse power protection for backup generators
Related Products
RET615: Transformer protection relay for step-up coordination
REG670: Generator management unit with extended metering
REC650: Bay controller for switchyard integration
SDCS-GEN-IO: Expansion I/O module for additional signals
HMI565: Local display for relay diagnostics
PCM600: Configuration software with generator protection library
ABB REX521GHHPSH07G
Installation and Maintenance
Pre-installation preparation: Verify CT saturation characteristics (KTD ≥10). Isolate relay ground from station ground using 100Ω resistor for 100% stator EF protection. Pre-configure IEC 61850 GOOSE mappings via PCM600.
Maintenance recommendations: Perform annual injection testing of differential protection. Validate synchronizer settings during planned outages. Monitor rotor temperature via integrated RTD inputs. Update firmware using cryptographically signed files only.
