G504 - (W) PRX400 Voltage Regulator

4 days - 2.6 Continuing Education Units Awarded

Objectives
Upon completion of this course, participants will be able to:

1. State the function of the PRX400 Voltage Regulator
2. Describe the relationships between generator terminal voltage, excitation current, Megawatts and Megavars
3. Identify the limiting components of the generator associated with exceeding the voltage rating of the machine or the limits established by the Generator Capability Curve
4. Identify the limiting and protective features that protect against exceeding the voltage rating of the machine or the limits established by the Generator Capability Curve
5. Identify the effects on the PRX400 Regulator when the Regulator Control Switch is taken from OFF(MAN) to TEST
6. Identify the effects on the PRX400 Regulator when the Regulator Controls Switch is taken from TEST to ON(AUTO)
7. Identify the effects on the PRX400 Regulator when a “Regulator Trip” occurs
8. Identify the function of each device in the PRX400 Fixed Power Bridge
9. Identify the function of each module in the Firing Circuit Module
10. Identify the function of each Logic and Limiter module
11. Identify the function of each Protective module
12. Identify the function of the Isolation Transducers, Adjuster Panels and the Input Intelligence Panel
13. Identify which of the limiting and protective features are operable in each operating mode: OFF, TEST and ON
    • Minimum Excitation Limiter
    • Maximum Excitation Limiter
    • Volts/Hz Limiter
    • Forcing Alarm
    • Over Excitation Protection
    • Volts/Hz Protection
    • Overcurrent Protection
    • Loss of Sensing
14. Describe the actions taken by each of the limiting and protective features when the device is activated
    • Minimum Excitation Limiter
    • Maximum Excitation Limiter
    • Volts/Hz Limiter
    • Forcing Alarm
    • Over Excitation Protection
    • Volts/Hz Protection
    • Overcurrent Protection
    • Loss of Sensing
15. Identify the conditions which extinguish the “Drawer Operative” lamps on the Power Drawer and Firing Circuit module
16. Describe the effect on the operability of the PRX400 Voltage Regulator if a “Blown Fuse” or “Loss of Pulse” condition occurs
17. Given a set of plant operating conditions, analyze the conditions to determine the expected values on each meter on the Metering Panel
18. Given a set of plant operating conditions and a set of meter values, analyze the values to determine which meter is inconsistent with the plant conditions

Course Outline

1. INTRODUCTION: Course Description and Goals, PRX400 Application
2. BASIC EXCITATION AND VOLTAGE REGULATION: General Requirements, Regulator Action
3. VOLTAGE REGULATOR COMPONENTS: Solid-State Components, Block Diagram
4. BASIC REGULATION: Review of Excitation and Control Schematics; Power Amplifiers, Thyristor Operation, Control, Firing Circuit, Pulse Generation, Firing Circuit Module Analysis, DC Error Detector, Description and Purpose of Basic Regulation Circuits, Calibration
5. AUTOMATIC VOLTAGE REGULATION: Intelligence Input Panel, AC Isolation Transducer, Power Supply, AC Voltage Error Detector, Compensation, Excitation System Stabilizer, Signal Mixer, DC Isolation Transducer, Electronic Voltage Adjuster
6. LIMITING AND PROTECTION MODULES: General Description, Minimum Excitation Limiter Test and Calibration Procedure (including Setting Calculations), Forcing Alarm Test and Calibration Procedure (including Setting Calculations), Maximum Excitation Limiter Test and Calibration Procedure (including Setting Calculations), Overexcitation Protection Test and Calibration Procedure (including Setting Calculations) Volts per Hertz Limiter Test and Calibration Procedure (including Setting Calculations), Volts per Hertz Protection Test and Calibration Procedure (including Setting Calculations)
7. MAINTENANCE TESTING
8. TEST PROCEDURE COMPLIANCE: Calibration of DC Error Detector Module, Calibration of AC Error Detector Module, Voltage Adjuster Settings, Excitation System Stabilizer Test, DC Isolation Transducer Calibration, Limiters - Test and Calibration, Protective Modules - Test and Calibration