ABB UNITROL1020 UNS0119A-Z, V1 3BHE030579R0001 Integrated Digital Excitation Regulator

I. Basic Parameters
Brand: ABB
Series Model: UNITROL 1020
Hardware Number: UNS0119A-Z, V1
Material Order Number: 3BHE030579R0001
Product Type: Integrated Digital Automatic Voltage Regulator (AVR Excitation Controller) for Integrated Synchronous Generators
Applicable Generator Capacity: 100kVA to 20MVA for Medium and Small-sized Synchronous Generators
Installation Method: Standard DIN Rail / Wall-mounted Installation of Control Cabinet, Protection Grade IP20

Core Functions
1. Multi-mode Excitation Regulation Control
Constant Stator Voltage Mode (AVR): Stable voltage regulation accuracy ±0.2%, quickly suppress grid and load fluctuations, ensuring stable power supply voltage;
Constant Reactive Power / Constant Power Factor Mode: When the generator is connected to the grid, precisely allocate reactive load, equal distribution of reactive load among multiple generators;
Manual Excitation Current Closed-loop Mode: Manual adjustment of excitation during maintenance or fault conditions, achieving smooth and undisturbed automatic switching;
Built-in PSS Power System Stabilizer, effectively suppresses low-frequency oscillations in the grid, improves transient stability of grid connection.
2. Complete Set of Generator Safety Limitations and Protection Functions
Complies with IEEE 421.5 Excitation Standards, integrates complete software and hardware protection:
Overexcitation Limit OEL, Underexcitation Limit UEL, V/Hz (Voltage/Hertz) Limit (Preventing Core Magnetic Saturation);
Rotor Excitation Overcurrent, Loss of Excitation Protection, Machine Terminal Overvoltage / Undervoltage Protection, Rectifier Bridge Fault Diagnosis;
Has Black Start Function, can establish generator no-load voltage autonomously in islanding conditions.
3. Rich I/O and Communication Capabilities
Analog Input: 3 channels of voltage / current acquisition input, 2 channels of analog signal output;
Digital Input: 8 channels of switch input, 4 channels of relay contact output, used for interlock, alarm, remote switching;
Communication Interfaces: Ethernet, USB, RS485 (Modbus RTU), CAN Bus;
Companion Debugging Software: CMT1000, capable of online parameter setting, fault recording, event log query, program upload and download.
4. Integrated Integration Design
Built-in IGBT Excitation Power Drive Unit, continuous excitation output 20A, peak 38A, no need for additional external power amplifier board, compact in size, simple wiring,兼具 control + power output dual functions.

Key Electrical Technical Specifications Table
Parameters Technical Indicators
Auxiliary Power Supply DC 12.5～48V wide-range DC power supply
Terminal Voltage Sampling Three-phase 0～250V AC (secondary side of PT)
Rated Continuous Excitation Output DC 20A, 55℃ environment; Peak 38A
Voltage Regulation Accuracy ±0.2%FS
Adjustment Response Time ≤100ms
Operating Temperature -25℃～+70℃
Storage Temperature -40℃～+85℃
Certification CE, cUL, DNV shipyard certification
Overall Power Consumption ≤85W

Panel Configuration Description
LCD Liquid Crystal Operation Panel: Local viewing of voltage, current, excitation parameters, fault alarm; Buttons for local parameter setting and mode switching;
Status Indicator Lights: Operation, Fault, Excitation Limit Action, Communication Status Indication;
Interface Layout: Ethernet port, USB debugging port, CAN bus terminal, separation of strong and weak electrical green plug-in terminal block.

Typical Application Scenarios
Synchronous Generator Excitation Voltage Regulation for Small and Medium-sized Hydropower, Thermal Power, Gas Power, Diesel Standby Power Stations;
Excitation Control for Grid Connection of Metallurgical, Chemical, Mining Standby Power Plants, Waste Heat Power Generators;
AVR Control for Ship Power Generators, Offshore Platforms, Rail Transit Onboard Synchronous Generators;
Replacement of Old UNITROL1000 Series Excitation Systems and Technical Renovation and Upgrade of Excitation Equipment.

Compatible Models of the Same Series
UNITROL1010: No LCD panel, only basic AVR voltage regulation, function is simplified, cannot be directly hardware interchangeable;
UNITROL1020 Different suffix order numbers (3BHE030579R0003/R0007): Hardware is completely the same, only factory configuration differences, can be directly replaced, requires re-downloading of unit parameters.