UNITROL® 6000 AVR Systems

Main Features of UNITROL 6080 AVRs

Basic regulator functions

- Voltage regulator with adjustable PID controller (AUTO operating mode)
- High Initial Response (HIR) control scheme
- Field current regulator with adjustable PI controller (MANUAL operating mode)
- Reactive and/or active current droop / compensation
- Limiters for:
  • Underexcitation (UEL) and overexcitation (OEL)
  • P/ Q underexcitation
  • Volt/ Hertz
- Superimposed controller for machine or tie-line power factor or reactive power
- Power System Stabilizer (PSS)
- Manual restrict

Operation control functions
- Operation of all auxiliaries
- Start-stop sequence for any configurable application (supply mode(s), unit operation modes e.g., generator / motor)
- Exciter operation modes (AUTO, MANUAL, IMPOSED CONTROL)
- Automatic follow-up of all non-active control modes
- Reference value setting
- Reactive load reduction to zero before shut down
- Support of TEST sequences for commissioning and maintenance

Monitoring and protection functions
- Internal event recorder with real-time stamp
- PT and/or CT signals supervision
- Loss of excitation
- Over current, inverse time and instantaneous
- Rotating diodes (rectifier) branch faults
- Thyristor converter monitoring:
  • Heat sink temperature
  • Branch fault (short circuit or not conducting)
  • Output short circuit
  • Supply voltage
  • Phase sequence
- Controller self monitoring:
  • CPU watch dog
  • Incomplete sequences
  • Loss of any auxiliary power
  • Loss of sensors
  • Loss of internal communication

Field bus serial interfaces

Human Machine Interface (HMI)

Service Control Panel (SCP) - one per Control Channel:
- Instrumentation
- Local control functions (start / stop / reference value setting)
- Local control parameter setting
- Alarm and Event display

Excitation Control Terminal (ECT) - common for all Control Channels:
- Instrumentation (Instruments, Power Chart)
- Local control
- Parameter setting
- System set-up (parameter loading, guided set-up and tuning support)
- Tuning (Trends)
- Maintenance (display of Alarm and Event list for different channels, separate or merged)
- Manual or automatic (re)triggered transient recording
- Long-term data storage events, transient records
- Provisions for remote access
ECT can be located at the excitation system as a door panel for local control and / or in the central control room for remote operation. Please refer to Tools Tab to learn more about the Excitation Control Terminal Software (ECT SW).

Operating screen of the ECT

Event list screen of the ECT

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    ABB contact for United States of America

    Sales: Mina Aziz
    Service: Rosa Vargas
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