ABB UNITROL 1000 Excitation System

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1. Product Overview

The ABB UNITROL 1000 is a high-performance static excitation system for synchronous generators. It provides precise control of generator field current to maintain stable voltage output and efficient power regulation. Suitable for power plants, industrial generators, and renewable energy systems, the UNITROL 1000 offers fast digital control, reliable protection, and enhanced generator stability and safety.

2. Technical Specifications

• Model: UNITROL 1000

• Brand: ABB

• Type: Static Excitation System for Synchronous Generators

• Rated Power: Custom based on generator capacity

• Excitation Type: Static excitation (IGBT or controlled rectifier)

• Control Method: Digital closed-loop control with PID regulation

• Input Voltage: System-dependent, typically 380–480 V AC or 24–110 V DC auxiliary power

• Output Current: Designed according to generator rated field current

• Response Time: Typical < 50 ms

• Protection: Over-excitation, under-excitation, overcurrent, overvoltage, undervoltage, short-circuit, reverse current protection

• Operating Temperature: ‑10 °C to +55 °C

• Mounting: Cabinet or panel-mounted

• Communication Interfaces: Supports Modbus, IEC61850, DNP3, etc.

• Application: Industrial generators, steam turbines, hydro turbines, wind turbines

3. Key Advantages & Features

1. Precise Voltage Control – High-speed digital control ensures stable generator voltage, improving grid quality.

2. Fast Dynamic Response – IGBT or controlled rectifier responds quickly to load changes and grid disturbances.

3. Multiple Protection Functions – Built-in over-excitation, overcurrent, undervoltage, and short-circuit protection.

4. Digital Control & Monitoring – PID regulation and SCADA integration for advanced monitoring.

5. High Reliability – Modular design enables easy maintenance and long-term industrial operation.

6. Flexible Application – Suitable for steam, hydro, gas, and wind turbine generators of varying capacities.

4. Typical Applications

• Synchronous generator excitation in thermal power plants

• Hydro generator excitation in hydropower plants

• Wind turbine generator excitation control

• Industrial standby generators and large factory power systems

• Voltage regulation and reactive power control in power grids

5. Installation & Usage Notes

1. Power Supply Requirements – Ensure auxiliary power is stable and reliable.

2. Grounding & Safety – Proper grounding according to electrical safety standards.

3. Environmental Conditions – Avoid high temperature, humidity, and corrosive gases; ensure cabinet ventilation.

4. Parameter Configuration – Configure excitation current and PID parameters according to generator specifications and operating conditions.

5. Regular Maintenance – Inspect excitation modules, cooling fans, and wiring terminals to ensure stable long-term operation.