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ABB 3BHE030579R0006
The ABB 3BHE030579R0006 (UNITROL 1020-0006 FULL) is a digital automatic voltage regulator (AVR) and excitation controller from ABB’s UNITROL 1000 excitation system family. It is designed for small and medium-sized synchronous generators and industrial synchronous machines, providing precise excitation control, voltage regulation, reactive power management, and generator stability functions.
As the FULL-function version of the UNITROL 1020 series, this model provides enhanced control functions compared with BASIC versions, including advanced monitoring, data logging, and flexible operating modes. It is commonly used in power generation, industrial plants, marine power systems, and generator retrofit projects.
Product Parameters
| Parameter |
Specification |
| Manufacturer |
ABB |
| Model |
UNITROL 1020-0006 FULL |
| Part Number |
3BHE030579R0006 |
| Product Type |
Digital Automatic Voltage Regulator / Excitation Controller |
| Series |
ABB UNITROL 1000 |
| Application |
Synchronous generator excitation control |
| Excitation Type |
Indirect excitation system |
| Continuous Output Current |
Up to 10 A DC |
| Short-Time Current Capability |
Up to 38 A (depending on operating conditions) |
| Nominal Input Voltage |
Approx. 250 VAC |
| Auxiliary Power Supply |
Wide-range AC/DC supply |
| Communication Interfaces |
RS-485 Modbus, Ethernet, USB (depending on configuration) |
| Protection Class |
IP20 |
| Operating Temperature |
Up to approximately 55°C standard operation |
| Mounting Type |
Panel / cabinet installation |
| Country of Origin |
Switzerland |
Core Functions
Automatic Voltage Regulation (AVR)
The UNITROL 1020 provides high-precision generator terminal voltage control by continuously adjusting excitation output, ensuring stable generator voltage under changing load conditions.
Reactive Power and Power Factor Control
The controller supports:
- Reactive power regulation (VAR control)
- Power factor control
- Manual excitation current control
- Voltage control mode switching
These functions help optimize generator operation and improve grid stability.
Excitation System Monitoring
Integrated monitoring functions include:
- Generator voltage measurement
- Excitation current monitoring
- Operating status supervision
- Fault diagnostics
- Event recording
Communication Capability
The controller supports integration with plant automation systems through industrial communication interfaces such as:
- Modbus RTU
- Ethernet communication
- USB service connection
This allows configuration, commissioning, and maintenance through ABB engineering tools.
Design Features
Compact Digital Architecture
The UNITROL 1020 uses a compact digital control platform combining microprocessor-based regulation technology with power electronic control, providing fast response and stable excitation performance.
Flexible Control Modes
The FULL version supports multiple operating modes:
- Automatic voltage regulation
- Manual excitation control
- Reactive power control
- Power factor control
High Reliability Design
Features include:
- Continuous self-monitoring
- Protective limitation functions
- Industrial-grade components
- Compact cabinet installation design
Upgrade Compatibility
ABB positions the UNITROL 1020 series as a replacement solution for earlier UNITROL 1000 variants. The 3BHE030579R0006 corresponds to the UNITROL 1020 FULL configuration replacing certain UNITROL 1000-7 and UNITROL 1000-15 applications.
Hardware Composition
The ABB UNITROL 1020-0006 FULL mainly consists of:
- Digital controller board
- Power electronic excitation output stage
- Voltage and current measurement circuits
- Communication interface modules
- Digital and analog I/O channels
- LCD display and local operation interface
- Terminal connection system
Typical I/O resources include:
- Analog inputs for measurement signals
- Analog outputs for control signals
- Digital inputs for commands and status signals
- Configurable digital outputs for alarms and control functions
Typical Applications
Power Generation Plants
Used for excitation control of:
- Hydro generators
- Diesel generator sets
- Industrial power generators
Industrial Facilities
Suitable for:
- Steel plants
- Chemical plants
- Mining facilities
- Large industrial synchronous motors
Marine Power Systems
Applied in:
- Shipboard generators
- Marine auxiliary power systems
Generator Retrofit Projects
Used as a modernization solution for replacing older analog excitation regulators and improving generator control performance.
Maintenance Considerations
- Verify excitation parameters before replacement or commissioning.
- Check voltage transformer (PT) and current transformer (CT) wiring compatibility.
- Regularly inspect communication connections and terminal conditions.
- Backup configuration parameters before replacement.
- Ensure firmware and commissioning software compatibility.
- Monitor alarms related to over-excitation, under-excitation, voltage deviation, and communication faults.
Overall Evaluation
The ABB 3BHE030579R0006 UNITROL 1020-0006 FULL is a compact and reliable digital excitation controller designed for synchronous generator voltage regulation and excitation management. With advanced AVR functions, communication capability, protection features, and flexible operating modes, it is widely used in industrial power generation and generator modernization projects.
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