Description
ABB REX521GHHPSH07G REX521 Series High‑End Feeder & Large AC Motor Protection IED for MV Switchgear
Product Introduction
The ABB REX521GHHPSH07G is a fully‑featured numerical protection relay within the legacy ABB REX521 family, designated with configuration code H07 optimized for medium‑voltage motor and feeder protection. This multi‑functional intelligent electronic device integrates protection algorithms, electrical measurement, circuit breaker control, fault event recording and multi‑protocol data communication in one compact 6U panel‑mount unit. Designed for conventional current transformers and voltage transformers, it supports multiple neutral‑grounded MV network architectures. REX521 product series was officially discontinued by ABB since 2012, yet these relays are still widely operating in utility distribution substations and industrial power plants globally. This GHHPSH07G variant is a high‑spec hardware version, commonly procured as emergency spare part for aging switchgear panel replacement and preventive spare inventory.
Specific Application Information
- MV feeder full protection: 3‑phase overcurrent, instantaneous trip, earth‑fault, directional overcurrent protection for incoming & outgoing feeders.
- Large medium‑voltage motor safeguarding: Motor start‑up supervision, thermal overload protection, negative sequence, phase reversal, locked‑rotor and undercurrent protection.
- Circuit breaker remote & local control: On‑panel HMI operation or SCADA remote trip / close command for breaker control.
- Power quality monitoring: Measure THD of voltage & current, harmonic distortion and unbalance of three‑phase system.
- Fault disturbance recording: High‑sampling waveform capture for post‑fault event analysis and root‑cause diagnosis.
- Transformer backup protection: Serve as secondary backup protection for distribution power transformers.
- Event & alarm logging: Record protection operation timestamps, relay self‑diagnostic warnings and breaker operation counters.
- Substation data gateway: Upload measured values, status and protection alarms to upper SCADA via serial communication.
REX521GHHPSH07G
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | REX521GHHPSH07G (H07 motor protection configuration) |
| Product Type | Numerical Feeder & Motor Protection Relay |
| Platform | ABB REX521 Protection IED Series |
| Rated CT Input | 1 A / 5 A selectable |
| Rated VT Input | 100 V, 110 V, 115 V, 120 V AC |
| Digital Inputs | 9 configurable binary inputs |
| Relay Outputs | 4 heavy‑duty trip outputs + 2 signal output relays + 1 IRF self‑fault contact |
| Communication Protocols | IEC 60870‑5‑103, SPA, LON, DNP3.0, Modbus RTU |
| Front Port | Optical RS232 service port for local commissioning |
| Operating Temperature | -25°C ~ +70°C |
| Mounting | 19‑inch rack 6U panel flush mounting inside MV switchgear cubicle |
| Dimensions | W 148.8 mm × H 265.9 mm × D 235 mm |
| Approx. Weight | ~2.8 kg |
| Certification | CE compliant for substation secondary equipment |
Main Features
✅ Dual‑purpose feeder & motor protection: H07 firmware preset with dedicated large motor protection logic for medium‑voltage motor loads. ✅ Rich protection function library: Multi‑stage overcurrent, earth fault, motor thermal model, negative sequence and locked rotor protection. ✅ Built‑in fault recorder: Capture pre‑fault and post‑fault waveform data to facilitate power system fault analysis. ✅ Power quality measurement: Onboard harmonic & THD calculation for grid power quality supervision. ✅ Local HMI operation: Front LCD display, LED status indicators and physical keys for on‑site parameter checking and breaker control. ✅ Multi‑protocol serial communication: Flexible connection with RTU, SCADA and plant DCS systems. ✅ Continuous self‑supervision: Hardware self‑diagnosis, internal fault alarm via dedicated IRF relay contact. ✅ Wide network adaptability: Suitable for isolated neutral, resonant earthed, solidly earthed and resistance earthed distribution networks.
Application Scenarios
- Medium‑Voltage Switchgear Cubicles: Incoming / outgoing feeder protection for single busbar distribution systems.
- Industrial Large Motor Loads: MV motor protection for pumps, compressors, fans and conveyor drive motors.
- Utility Distribution Substations: Primary and secondary substation feeder protection & breaker control.
- Mining & Mineral Plants: Medium voltage power distribution protection for crushing and conveying workshops.
- Pulp & Paper Factories: Protection for large paper‑machine auxiliary medium‑voltage motors.
- Chemical Process Plants: MV motor and feeder protection for continuous production power distribution.
- Transformer Backup Protection: Backup overcurrent and earth‑fault protection for distribution transformers.
Supporting Components
- Current transformers (CT) & voltage transformers (VT)
- Circuit breaker trip coil and close coil circuits
- Relay setting configuration software tool for REX521
- Serial communication cables (SPA / Modbus / IEC103)
- DC auxiliary power supply for protection panel
- Binary input signal wiring from breaker auxiliary contacts
- Shielded communication cables to SCADA / RTU cabinet
- Panel mounting brackets and rear terminal wiring blocks
REX521GHHPSH07G
Related Series Models (ABB REX521 Protection Relay Family, 8 Models)
- REX521GHHPSH01G — Basic Feeder Protection Configuration B01
- REX521GHHPSH02G — Standard Feeder Protection Configuration B02
- REX521GHHPSM01G — Medium Specification Feeder Protection M01
- REX521GHHPSM02G — Medium Specification Feeder Protection M02
- REX521GHHPSH01G — High‑end Feeder Protection H01
- REX521GHHPSH02G — High‑end Feeder Protection H02
- REX521GHHPSH03G — High‑end Feeder Protection H03
- REX521GHHPSH07G — High‑end Motor & Feeder Protection (Target Model)
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