ABB REX010 Earth Fault Protection Unit for Generator and Distribution System Protection
ABB REX010 Earth Fault Protection Unit for Generator and Distribution System Protection
0.0
Points
Brand:ABB PLC Item No.:ABB REX010 Product Origin:Sweden Product Dimensions:1.3 × 25.4 × 20.3 cm Product Weight:0.5 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The ABB REX010 Earth Fault Protection Unit is a specialized protection device designed to detect ground (earth) faults in electrical power systems, particularly in generators and medium- to high-voltage networks. Manufactured by ABB, the REX010 is commonly used as part of generator protection schemes and works together with other protection relays to provide comprehensive earth-fault monitoring.
The unit continuously supervises insulation and neutral grounding conditions. When abnormal earth currents or insulation breakdowns occur, it quickly triggers alarms or trip signals to prevent equipment damage and ensure personnel safety. This fast response capability makes it critical for protecting generators, transformers, motors, and cables in power plants and industrial installations.
In many generator protection systems, the REX010 is paired with the REX011 injection transformer and protection relays such as REG216 or REG316 to achieve 100% stator and rotor earth-fault protection coverage.
Technical Specifications
Parameter
Specification
Product Model
REX010
Manufacturer
ABB
Product Type
Earth Fault Protection Unit
Typical Applications
Generator, transformer, motor earth-fault protection
Rated Frequency
50 / 60 Hz
Voltage Range
277 / 480 V AC (typical system voltage)
Current Range
5 A – 2000 A
Detection Accuracy
±2% earth-fault resistance measurement
Auxiliary Power Supply
Approx. 36–312 V DC
Response Time
< 30 ms (typical detection speed)
Protection Class
Up to IP65 depending on enclosure
Operating Temperature
−20°C to +55°C
Storage Temperature
−40°C to +85°C
Dimensions (H × W × D)
Approx. 1.3 × 25.4 × 20.3 cm
Weight
Approx. 0.5 kg
Specifications may vary depending on configuration and system design.
Recommended Related Models
Model
Description
REG216
Generator protection relay
REG316
Advanced generator protection relay
REX011
Injection transformer block for earth-fault detection
RET670
Transformer protection relay
RED670
Line differential protection relay
Popular ABB Models
Model
Module Type
PM583-ETH
PLC CPU Module
CI840A
Communication Interface Module
AI830A
Analog Input Module
SB822
Power Supply Module
PP865A
Industrial Operator Panel
Applications
The ABB REX010 unit is designed for earth-fault monitoring and insulation supervision in critical electrical equipment.
Typical applications include:
Generator stator earth-fault protection
Rotor earth-fault monitoring systems
Medium- and high-voltage power generation plants
Industrial motors and large rotating machines
Transformer neutral grounding protection
Power plant generator protection systems
Substation protection schemes
The unit is particularly important in power plants, where generator earth faults can cause severe damage if not detected quickly.
Advantages
Reliable Earth-Fault Detection
Continuously monitors grounding conditions and detects insulation failures early to prevent equipment damage.
Fast Fault Response
High-speed detection (typically under 30 ms) ensures rapid protective action during earth faults.
Comprehensive Generator Protection
Works together with generator protection relays and injection transformers to achieve full stator and rotor protection coverage.
Robust Industrial Design
The device is designed for demanding environments such as power plants and heavy industrial installations.
Flexible System Integration
Can be integrated into generator protection schemes, substation protection systems, and industrial automation environments.
Compact Installation
Small footprint allows installation in control panels and generator protection cabinets.
Technical FAQs
1. What is the main function of the ABB REX010?
It detects earth faults and protects generators or electrical equipment from ground faults.
2. What systems typically use the REX010?
Generator protection systems, medium-voltage networks, and industrial electrical installations.
3. Does the REX010 work with other ABB devices?
Yes, it often operates together with REX011 injection transformers and generator protection relays such as REG216 or REG316.
4. What type of faults does it detect?
Earth faults caused by insulation breakdown or current leakage to ground.
5. How fast does the device detect faults?
Typical detection time is less than 30 milliseconds.
6. What current range can the unit monitor?
Approximately 5 A to 2000 A depending on the system configuration.
7. Can it be used in power plants?
Yes, it is widely used in generator protection systems in power generation facilities.
8. What voltage systems can it operate in?
Typical systems operate around 277 / 480 V AC for monitoring circuits.
9. What environmental conditions can it handle?
It operates from −20°C to +55°C and can be installed in industrial environments.
10. Why choose the ABB REX010 unit?
Because it provides reliable and fast earth-fault protection for generators and critical electrical equipment.
