ABB UNITROL1020 3BHE030579R0003 Automatic Voltage Regulator

UNITROL1020 3BHE030579R0003 is a digital automatic voltage regulator (AVR) developed by ABB, serving as the core excitation control unit for medium and small synchronous generators. It accurately adjusts excitation current to stabilize generator terminal voltage under variable load conditions.

Equipped with high-speed microprocessor and built-in multiple limiting algorithms, this regulator supports flexible operation modes and standard industrial communication protocols. It features compact mechanical structure and excellent environmental adaptability for power plant cabinet installation.

Main Specifications

• Model: UNITROL1020, Part No: 3BHE030579R0003
• Digital excitation controller for synchronous generators
• Max excitation output current up to 20A DC
• Support AVR, FCR, power factor and VAR control modes
• Modbus RTU communication via RS485 interface
• Local LCD HMI for parameter viewing and configuration
• Complete set of overexcitation and underexcitation limit functions
• DIN rail cabinet mounting structure design
• Wide operating temperature range for power industry sites
• Compliant with international power system control standards

Core Functions

• Real-time automatic voltage regulation of synchronous generators
• Precise control of generator excitation current and reactive power
• Multiple limit protection to avoid generator abnormal operation
• Support generator soft start and field flashing control
• Load sharing and droop control for parallel generator sets
• System self-diagnosis, fault recording and alarm output
• Parameter configuration via local HMI or CMT1000 software
• Stable data exchange with upper SCADA monitoring system
• Anti-surge and electromagnetic interference suppression design
• Support continuous long-term unattended operation

Application Scenarios

• Hydropower station small and medium generator excitation systems
• Thermal power plant auxiliary synchronous generator units
• Diesel generator set automatic voltage control system
• Industrial self-provided power plant generator control equipment
• Ship power system synchronous machine excitation control
• Biomass and distributed energy generation projects
• Mine independent power supply generator control system
• Petrochemical factory on-site power generation equipment
• Grid-connected generator safety control unit
• ABB UNITROL series excitation system maintenance and spare parts