Description

ABB UNITROL 1020 3BHE030579R0003

1. Product Description

ABB UNITROL 1020 3BHE030579R0003 (equivalent model: UNS0119A-Z) is an industrial-grade compact digital Automatic Voltage Regulator (AVR), serving as an upgraded version of UNITROL 1010. It is mainly used for excitation control and voltage regulation of synchronous generators in static excitation systems, suitable for units with an excitation power output of up to 50 MW. It can accurately stabilize generator terminal voltage, suppress voltage fluctuations, and ensure synchronous operation of the generating unit. With complete protection and communication functions, it is a core excitation control device in power generation, marine, rail transit, wind power and other industries.

The regulator integrates high-performance control and power supply circuits, adopting a separate design for communication and control processors. It features a compact structure and simple mechanical design, suitable for harsh industrial environments. It supports a wide-range 12.5–48 V DC power input, integrates an RS-485 communication interface, and uses well-known IGBT power conversion technology. It provides rich built-in control software functions and freely configurable I/O interfaces. The separated design of power terminals and I/O connectors delivers high-level EMC immunity, complying with global grid codes and ensuring reliable unit control even under severe grid fault conditions.

It is widely applied in land-based power plants driven by diesel engines, gas/steam turbines and hydro turbines, as well as marine propulsion, diesel locomotives, direct-drive synchronous wind turbines and other scenarios. It is a high-end excitation regulation solution that balances reliability, compatibility and flexibility.

2. Technical Specifications

Parameter Category	Details
Model	UNITROL 1020 3BHE030579R0003 (equivalent model: UNS0119A-Z)
Manufacturer	ABB
Product Type	Industrial-grade compact digital Automatic Voltage Regulator (AVR), UNITROL 1000 series, excitation control equipment for static excitation systems
Core Purpose	1) Voltage regulation: accurately stabilize terminal voltage of synchronous generators and suppress fluctuations; 2) Excitation control: control excitation current (up to 40 A) with IGBT power conversion to ensure synchronous operation; 3) System adaptation: compatible with various unit types, compliant with global grid codes, suitable for static excitation systems; 4) Communication & monitoring: support RS-485 for remote monitoring and parameter configuration; 5) Fault protection: complete fault diagnosis and protection against grid faults to ensure equipment safety.
Electrical Parameters	Power input: 12.5–48 V DC, wide-range DC input supported; Excitation current output: max. 40 A (compact AVR), high-efficiency power conversion via IGBT/IGBT modules; Regulation accuracy: ±0.5% (typical); Fast response to grid voltage changes to ensure stable regulation; Multiple protections: over-excitation, under-excitation, overvoltage, undervoltage, overcurrent, loss-of-field, etc.; Compliant with IEC 60146, CE, UL, RoHS and major global grid codes.
Communication Parameters	Interface: 1×RS-485; Protocols: Modbus RTU and other mainstream industrial protocols; Remote parameter configuration, status monitoring and fault diagnosis, seamless integration into power plant or factory automation systems; Ethernet-synchronized time stamping for events and data logging.
Physical Dimensions	Compact modular package for panel / standard industrial cabinet mounting; Dimensions: approx. 130×90×65 mm (W×H×D); Weight: approx. 0.6 kg; Screw mounting, easy installation without special tools, fast integration into excitation systems; modular design for easy maintenance; Polymer housing for effective protection of internal circuits.
Protection Degree	IP20 (cabinet flush / panel mounting), basic dust protection; Separated power and I/O connectors for improved EMC performance; Industrial corrosion-resistant polymer housing, anti-EMI internal circuit design for high-interference industrial environments.
Environmental Rating	Operating temperature: -25°C ~ +70°C (wide temperature), suitable for extreme environments; optional air or water cooling for stable operation; Storage temperature: -40°C ~ +85°C; Relative humidity: 5% ~ 95% (non-condensing); Vibration: compliant with IEC industrial standards; Shock: compliant with IEC 60068-2-27; robust mechanical structure; Suitable for marine salt spray and high-interference rail transit environments.
Other Features	Separate communication and control processors for improved stability; Rich built-in software, configurable measurement and I/O interfaces (4 DI, 2 DO, 1±10V AI); Online firmware upgrade without unit shutdown; User-friendly commissioning tools (PC-based CMT 1000 tool) for on-site setup and maintenance; Built-in non-volatile flash memory for event and data logging, facilitating fault analysis; MTBF > 200,000 hours; CE, RoHS, UL certified, compliant with international industrial standards; LED status indicators for direct operation monitoring.

3. Functions & Features

(1) Precise Voltage Regulation & Stable Excitation Control

High accuracy: Typical voltage regulation accuracy ±0.5%, using advanced control algorithms to stabilize generator voltage and meet global grid requirements for static excitation systems.
High-efficiency excitation: Up to 40 A output with professional IGBT power conversion; automatic adjustment according to operating conditions, suitable for various synchronous generators up to 50 MW excitation power.
Fault-ride capability: Excellent dynamic response, ensuring stable control under severe grid faults and meeting Fault Ride Through (FRT) requirements; built-in complete fault recording for traceability and analysis.

(2) Rich Communication & Flexible System Integration

Reliable communication: RS-485 with Modbus RTU for remote configuration, monitoring and diagnosis; seamless integration with upper-level systems. USB power supply supported for file download and parameter setup without main input power.
Flexible I/O: Configurable digital and analog interfaces, customizable for various units and applications without modification; compatible with various fieldbuses and connection to PLC, DCS.
Separate processors: Independent control and communication tasks avoid interference, improving accuracy and stability; separated power and I/O connectors further enhance EMC performance.

(3) High Reliability & Comprehensive Protection

Harsh environment rated: Wide temperature, high humidity, vibration and salt spray resistance; optional air/water cooling; corrosion-resistant polymer housing for internal circuit protection.
Multi-level electrical protection: Over-excitation, under-excitation, overvoltage, undervoltage, overcurrent, loss-of-field and other protections; automatic fault isolation; clear LED and panel indication for quick troubleshooting.
Long-life operation: High MTBF, industrial-grade components, rugged modular design, low maintenance; non-volatile memory retains records after power failure.

(4) Easy Commissioning & Maintenance

Intuitive tools: PC-based CMT 1000 software for fast on-site commissioning and parameter setting; USB-based commissioning without field power.
Online maintenance: Remote firmware update without shutdown; built-in self-diagnosis with real-time alarm and fault codes; clear panel symbols for alarms and limits.
Simple installation & service: Compact size, screw mounting for panel or cabinet; fast integration for new installations and retrofits; modular structure for easy maintenance and replacement.