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ABB REX010 HESG324426R1 – Injection-Type Generator Stator Ground Fault Protection Unit
Product Overview
The ABB REX010 (material number HESG324426R1) is a specialized injection-type protection unit engineered for generator stator ground fault detection in medium- and high-voltage power generation systems–1. As a core component of ABB’s REX series within the protection and control segment, this device addresses one of the most critical challenges in generator protection: achieving 100% stator winding ground fault coverage, including the neutral point area where traditional protection schemes leave blind spots-1-.
Operating on the injection detection principle, the unit injects low-frequency signals into the stator circuit to accurately detect all winding ground faults-1. It is designed to work seamlessly with ABB REG216 or REG316 numerical generator protection relays, forming a complete stator/rotor ground fault protection scheme-1. The REX010 is widely deployed in thermal, hydraulic, and nuclear power plants, as well as industrial captive power plants and marine power systems-1. Its modular design and IP65 enclosure make it suitable for embedded installation in switchgear cabinets, even in harsh power plant environments-1.
Technical Specifications — REX010
| Parameter | Specification |
|---|---|
| Product Model | REX010 |
| Material Number | HESG324426R1 |
| Manufacturer | ABB (Switzerland) |
| Product Type | Injection-Type Ground Fault Protection Unit |
| Protection Scope | 100% stator winding (including neutral point)-1 |
| Maximum Primary Monitoring Voltage | 3200 V DC-1 |
| Auxiliary Power Supply | 36 – 312 V DC-1 |
| Frequency Range | 50 / 60 Hz-1 |
| Double-Point Fault Detection | Yes – identifies two independent ground points-1 |
| System Compatibility | ABB REG216 / REG316 protection relays-1 |
| Operating Temperature | -20°C to +55°C-1 |
| Storage Temperature | -40°C to +85°C-1 |
| Protection Rating | IP65-1 |
| Dimensions (L×W×H) | Approx. 254 × 203 × 13 mm-1 |
| Weight | Approx. 7.35 kg-1 |
| Installation | Embedded / switchgear mounting-1 |
- ABB REX010 HESG324426R1
Key Features and Benefits — REX010
100% Stator Winding Protection – Unlike conventional protection schemes that leave the neutral point unprotected, the injection-based detection method ensures complete coverage of the entire stator winding, eliminating protection blind spots-1.
Wide-Voltage DC Power Supply – The auxiliary power accepts 36 to 312 V DC, making it directly compatible with power station battery systems without requiring additional AC power conversion-1.
Dual-Point Fault Identification – The unit can detect and distinguish two independent ground faults within the protected zone, significantly improving fault diagnosis capability under complex operating conditions-1.
High-Voltage Compatibility – With a maximum primary monitoring voltage of 3200 V DC, the device covers mainstream medium- and high-voltage generator systems-1.
Built-In Self-Diagnostics – Continuous monitoring of injected voltage, signal amplitude/frequency, and grounding system status ensures reliable operation; automatic alarms are triggered for any detected abnormalities-1.
Industrial-Grade Durability – Rated IP65 with an operating temperature range of -20°C to +55°C, the unit withstands the demanding environmental conditions found in power generation facilities-1.
Related Models
REX011 – Injection transformer unit that works in conjunction with the REX010 to complete the ground fault protection system-1-.
REG216 – Numerical generator protection relay that partners with the REX010 to deliver 100% stator and rotor ground fault protection-1-.
REG316 – Advanced numerical generator protection relay compatible with the REX010 injection unit for comprehensive generator protection-.
HESG324426R0001 – Alternative material number variant of the REX010 series, used in certain system configurations-.
Installation and Maintenance — REX010
Installation Requirements: The unit features a modular design suitable for embedded installation in switchgear cabinets-1. Ensure the mounting location provides adequate clearance for ventilation and cable routing. The auxiliary power supply must be within the 36–312 V DC range; verify polarity before connection-1. Use shielded cables for signal connections and maintain proper grounding to minimize electromagnetic interference. The device must be used in conjunction with the REX011 injection transformer and either REG216 or REG316 protection relays to form a complete protection system-1.
System Integration: During commissioning, verify the injection signal amplitude and frequency are within specified parameters. The unit continuously monitors system status and provides diagnostic feedback via relay outputs-1. Parameter settings should be configured according to the specific generator characteristics and protection coordination requirements.
Maintenance Best Practices: Perform periodic inspections of all terminal connections and cable integrity. The built-in self-diagnostics continuously verify proper operation; respond promptly to any alarm indications-1. Keep the enclosure clean and free from dust accumulation to maintain thermal performance. As this is a mission-critical protection device, functional testing should be conducted during scheduled outages following the manufacturer’s guidelines. Always consult the technical reference manual before modifying any settings or performing maintenance procedures.
