UNITROL® 5000 Excitation Systems

The UNITROL 5000 is the most powerful product in the ABB Switzerland

UNITROL® series of excitation systems. The microprocessor-based voltage

regulator uses the latest available technology. The development is based

on more than 40 years experience with semiconductor voltage regulators

and more than 15 years experience with microprocessor technology for

this application

Application areas

• Static Excitation Systems (SES) for

50 Hz, 60 Hz or 16 2/3 Hz power supply

with field currents from 1000 ADC to

more than 10,000 ADC

• Automatic Voltage Regulating Systems

(AVR) for exciter machines with special

functions, supply frequencies from

16 2/3 Hz to 400 Hz.

Regulator highlights

Additional regulator redundancy

• Dual-channel system with backup

current regulator

Digital input processing

• Three-phase voltage measurement

• Three-phase current measurement

• Digital processing of the input values

with a signal processor

Additional functions

• Software solutions only – without

additional hardware

Additional inputs and outputs

• Easy to extend to the required number

with ARCnet® devices

• Digital and analog

Event and error log

• With real-time stamp

• Remote interrogation possible.

Power section highlights

Power converter redundancy

• Up to a maximum of eight parallel

power converters are possible

• Power converter redundancy is completely

independent of the regulator

configuration

Intelligent power converter

electronics

• Active equalization of the current

between the power converters

• 4-quadrant operation (negative

excitation current is possible)

• Thyristor current monitoring

• Fan control and monitoring

• Monitoring of fuses, power converter

temperature and cooling-air flow

• Bridge current display.