Description
Product Overview
The 3BHE030579R0003 is the ABB UNITROL 1020 BASIC (UNS0119A-Z,V1) compact digital automatic voltage regulator (AVR), part of the UNITROL 1000 excitation family. This integrated all-in-one excitation unit combines control logic, IGBT power stage, measurement inputs, local HMI and communication ports in a single cabinet-mount package. It performs generator voltage regulation, reactive power control and excitation limit functions for small and medium synchronous generators, widely deployed on hydro, diesel and small gas turbine gen-sets, combined heat & power and marine power plants.
Technical Specifications
| Item | Parameter |
|---|---|
| Manufacturer | ABB |
| Part Number | 3BHE030579R0003 |
| Model | UNITROL 1020 BASIC, UNS0119A-Z,V1 |
| Product Type | Integrated Digital Excitation AVR |
| Topology | IGBT based indirect excitation |
| Rated Excitation Output | 20A continuous @40°C; 15A @55°C; 40A 10s overload |
| Power Supply Input | 100–400V AC auxiliary supply |
| Generator Voltage Input | Up to 690V L-L |
| Mounting | DIN rail / cabinet panel mount |
| Enclosure Rating | IP20 |
| Operating Temperature | -20°C ~ +60°C |
| Humidity | 5%–95% non-condensing |
| Weight | 3.736 kg |
| Protocols | Modbus RTU, optional Profibus, IEC 61850 |
| Local Interface | Front LCD + keypad HMI |
Key Features
- Fully integrated excitation solution; control board and IGBT power converter built inside one unit, reducing separate cabinet spare components.
- High-precision digital AVR with voltage, reactive power and power factor control modes for grid-parallel or island generator operation.
- Complete excitation protection suite: overexcitation, underexcitation, V/Hz limiter, field overcurrent and loss of excitation monitoring.
- Built-in multi-line HMI for local parameter viewing, manual excitation adjustment, alarm browsing and fault diagnostics.
- Flexible analog and digital I/O terminals for breaker status, synchronisation enable, external setpoint and alarm relay outputs.
- Supports static indirect excitation, suitable for brushless synchronous generators.
- Compact footprint for retrofit of older analog AVRs; simple commissioning via ABB UNITROL engineering software.
Installation & Testing Notes
- Ensure proper cabinet ventilation; derate output current if ambient cabinet temperature exceeds 40°C.
- Confirm PT/CT secondary wiring is correctly terminated; short CT terminals before wiring work to avoid hazardous voltage.
- Check auxiliary AC input matches unit rated range before energising.
- Configure generator nameplate parameters, AVR setpoints and limit curves in UNITROL PC tool.
- Perform static excitation test before generator rotation; run no-load voltage regulation test and grid paralleling check.
- Inspect front HMI, terminal blocks, power semiconductors and cooling fans for dust, corrosion or physical damage before spare deployment.
- Verify firmware revision matches site generator application before commissioning.
FAQ
Q: What is 3BHE030579R0003? A: It is the ABB UNITROL 1020 BASIC integrated digital excitation controller (AVR) for medium and small synchronous generators.
Q: Is UNITROL 1020 a plug-in card or complete excitation unit? A: It is a standalone complete excitation cabinet unit, not a subrack plug-in PCB card.
Q: What software is used for configuration? A: ABB UNITROL engineering software for parameter setup, fault record retrieval and firmware upgrade.
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