Abb rex010 HESG324426M1

1. Product Overview

The ABB REX010 (Part Number: HESG324426M1) is a high-performance earth fault protection unit, specially developed to provide reliable earth fault protection for generators, stators and other critical electrical equipment in medium and high-voltage applications. As a professional power equipment manufactured by ABB Switzerland, this product belongs to ABB’s renowned Relion protection and control relay series, delivering stable and professional protection performance for industrial power systems.

2. Main Technical Parameters

Parameter Item	Specification
Model	REX010
Part Number	HESG324426M1
Product Type	Earth Fault Protection Unit
Brand	ABB
Place of Origin	Sweden
Weight	7.35 kg
Operating Temperature Range	-40°C to +85°C
Standby Temperature Range	-20°C to +70°C
Power Supply Voltage	DC 24V / 36-312V DC
Rated Power	240W
Ingress Protection Rating	IP50 - IP67

3. Product Features

3.1 Professional Protection Functions

• Specially designed for generators and stators, delivering high-precision earth fault protection.
• Adopts multi-frequency admittance protection technology to effectively improve protection sensitivity and selectivity.
• Supports directional and non-directional overcurrent protection as well as earth fault protection.

3.2 Excellent Environmental Adaptability

• Wide temperature operating range from -40°C to +85°C, suitable for extreme industrial environments.
• Equipped with a robust and durable housing structure to withstand harsh working conditions.
• Features dustproof, moisture-proof and vibration-resistant properties for stable long-term operation.

3.3 Flexible Integration and Expansion

• Compatible with REX011 injection transformer to form a complete and integrated protection solution.
• Plug-in and pull-out design simplifies the commissioning, installation and maintenance of switchgear equipment.
• Supports multiple communication protocols, including Modbus RTU, Modbus TCP, RS-232 and RS-485.

3.4 High-Performance Processor

• Built-in 32-bit microprocessor with a running speed of 100MHz, ensuring efficient operation.
• Memory configuration: 256 MB RAM + 512 KB ROM.
• Enables high-precision measurement and rapid fault response to ensure power system safety.

4. Structure and Composition

4.1 Hardware Composition

• Main Protection Unit: Integrated with core protection algorithms and high-performance processor to realize all core protection functions.
• I/O Interface Module: 32 digital input and output points; 8 analog input and output points.
• Communication Interfaces: RS232, Ethernet and USB 2.0 interfaces, supporting diverse data transmission and device connection.
• Display Module: Optional large graphic display for convenient local data viewing and device operation.

4.2 Supporting Components

• REX011 Injection Transformer: Auxiliary device for enhancing earth fault protection performance.
• Optional Additional Card: RTD sensor or thermistor element input card is optional, used for direct temperature measurement of bearings and windings in key motor projects.
• Mounting Guide Rail: Supports standard DIN rail mounting for flexible installation.

5. Application Fields

The ABB REX010 earth fault protection unit is widely applicable to various medium and high-voltage power system scenarios, with detailed applications as follows:

Application Field	Specific Applications
Power Plants	Generator stator earth fault protection, rotor earth fault protection
Substations	Feeder protection, distribution transformer protection
Industrial Power Distribution	Medium and high-voltage motor protection, cable feeder protection
Power Transmission	Transmission line protection and monitoring
Industrial Control	Industrial automation, process control, energy management
Building Automation	Power system monitoring and protection

6. Installation and Maintenance

6.1 Installation Instructions

6.1.1 Installation Method

• Adopts a draw-out plug-in design, enabling quick insertion and removal of relay plugs for convenient operation.
• Supports standard DIN rail mounting, suitable for electrical cabinets with limited installation space.

6.1.2 Wiring Requirements

• Power supply voltage: DC 24V ± 20% or 36-312V DC.
• Ensure correct connection with the REX011 earth fault transformer.
• All wiring operations shall be implemented in accordance with ABB standard wiring diagrams.

6.1.3 Environmental Requirements

• Keep the ambient operating temperature within the range of -40°C to +85°C.
• Avoid installation in environments with high humidity and corrosive gas.
• The installation position shall be far away from strong electromagnetic interference sources to ensure stable device operation.

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