G531 - (W) WTAVoltage Regulator

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4 days - 2.6 Continuing Education Units Awarded

On-Site-Only


Course Dates Download Brochure PDF


Learn the necessary knowledge to maintain, repair and calibrate the WTA Excitation System.

HPC's WTA Excitation System Seminar makes heavy use of prints, on which the participants are encouraged to take notes. This provides a valuable reference for future use. In addition, the student manuals contain a complete description of the excitation system operation.

This Seminar is directed toward Electricians, Technicians and Engineers.

OBJECTIVES:
Upon successful completion of this Seminar the participant will be able to:
  1. Define and describe true power (MW), reactive power (VARs), apparent power (MVA), and power factor.
  2. Discuss how an excitation system accomplishes voltage and VAR control.
  3. Discuss the primary and secondary roles of an excitation system.
  4. Discuss the major excitation system components, including limit and protective features.
  5. Discuss the purpose and operation of the brushless exciter.
  6. Discuss the purpose and operation of the Manual Voltage Regulator (Base Adjuster).
  7. Discuss the purpose and operation of the boards in the logic drawer that comprise the Automatic Voltage Regulator.
  8. Discuss the purpose and operation of the Trinistat Power Amplifier.
  9. Discuss the purpose and operation of the Firing Circuits.
  10. Discuss the purpose and operation of Blown Fuse Alarm.
  11. Discuss the purpose and operation of the Excitation System Damping Board.
  12. Discuss the purpose and operation of the Reactive Current Compensator Module.
  13. Discuss the purpose and operation of the Maximum Excitation Limit.
  14. Discuss the purpose and operation of the Overexcitation Protection.
  15. Discuss the purpose and operation of the Minimum Excitation Limit.
  16. Discuss the purpose and operation of the Field Supply Breaker.
  17. Discuss the Automatic Ground Detector and Motor Operated Adjuster Panels.
  18. Trace a signal change through the WTA Excitation System, given prints.
  19. Discuss routine maintenance including what can and cannot be done on-line.
  20. Discuss troubleshooting of the WTA Excitation System, including expected voltage/signal levels at the boards.
  21. For a given symptom, list the most probable fault location(s).
  22. Discuss the options available to quickly narrow down the fault location.
Seminar OUTLINE:
  1. Introduction
  2. Review of Fundamentals
    1. Fundamentals of AC Power
    2. Generator Fundamentals
    3. Excitation System Fundamentals
  3. WTA Overview
    1. Block Diagram
    2. General Description
    3. Excitation Switchgear Layout
    4. Trinistat Power Amplifier Drawer
    5. Trinistat Firing Circuit Drawer
    6. Regulator Logic Drawer
    7. Regulator Protective Drawer
    8. Base Adjuster
  4. WTA Detailed Discussion
    1. Trinistat Power Amplifier
      1. Components
      2. Operation of Power Amplifier Section
      3. Operation of the Pulse Transformer Module
      4. Operation of the Blown Fuse Alarm
    2. Trinistat Firing Circuit Assembly
      1. Components
      2. Operation of the Transformer Module
      3. Operation of the Phase Shifter Module
      4. Operation of the Input Module
      5. Operation of the Pulse Generator
      6. Operation of the Loss of Pulse Module
    3. Logic Drawer
      1. Components
      2. Operation of the Excitation System Damping Board
      3. Operation of the Reactive Current Compensator Module
      4. Operation of the Reactive Droop Compensation Module
      5. Operation of the Reactive Line Droop Compensation Module
      6. Operation of the Resistive Line Drop Compensation Module
      7. Operation of the Voltage Error Detector Module
      8. Operation of the Signal Mixing Module
      9. Operation of the Minimum Excitation Limiter
      10. Operation of the Timer Limiter Module
    4. Protective Drawer
      1. Components
        1. Operation of the Forcing Alarm
        2. Operation of Timing Module (Fixed Time Timer)
      2. DC-DC Isolation Transducer
        1. Purpose and Application
        2. Description and Operation
      3. Motor Operated Adjuster Panel
      4. Field Supply Breaker
      5. Automatic Ground Detector Panel
        1. Operation
  5. Routine Maintenance
    1. On-Line
    2. Off-Line
  6. Troubleshooting & Repair
    1. Six-step Troubleshooting Method
    2. Symptom Analysis
    3. Expected Voltage/Signal Levels
    4. Most Common Failures
    5. Post Replacement Calibration