TG333 - Combined Cycle Steam Turbine Generator Operation

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4.5 days - 2.9 Continuing Education Units Awarded

Course Dates Download Brochure PDF
USD 2,695.00

Learn (or re-affirm) proper operation of the steam turbine-generator from the perspective of the control room operators. Emphasis is on decision-making regarding safe and effective operation of steam turbine generator equipment: TG Instruments / Controls, Starting and Loading Procedures/Considerations, and those Abnormal Events that occur all too often. Equipment discussed is normally a function of the participants' background. Presentation includes industry events/case studies.

Learn how a machine is at risk in service. Learn what are the symptoms of abnormal conditions and what might be proper corrective actions. Learn the purpose and function of the turbine-generator controls, how the controls are properly operated, how the controls respond to system conditions and what is the type and purpose of various protective circuits.

This course is intended to have a positive impact upon steam turbine operator decision-making. The course specifically targets Control Room Operators, wannabe CRO, and Shift Supervisors. Plant engineers will benefit as well. It has been HPC's experience that all too often that the procedures for starting up and loading a steam turbine are to select "start" and let the computer do the sequencing. Knowledgeable oversight of the computer processing is important. This course is directed toward the development of operational personnel through the "understanding" of what considerations the ideal and automated procedures are based upon. HPC believes that if personnel thoroughly understand the operating concepts the result will be less forced outages, improved efficiency and improved availability.

  1. Describe those steam turbine generator components that are susceptible to damage in abnormal operating conditions.
  2. Describe the type of damage that could occur and what the operator can (or cannot) do to correct for the situation.
  3. Describe in detail the function of the turbine generator support systems, procedural issues, “typical” abnormal conditions, and operator corrective action.
  4. Draw a simple block - diagram that describes all the elements of steam turbine controls: speed, load, and pressure control, the generation of a servomechanism signal, feedback and regulation.
  5. Draw a simple block – diagram that describes all the elements of generator controls.
  6. Describe the function of each of the block diagram elements drawn.
  7. Describe each of those operating parameters monitored by turbine supervisory instruments: eccentricity, shell expansion, differential expansion, rotor expansion, thrust position, and vibration.
  8. Describe normal steam turbine generator start-up procedures.
  9. Describe normal steam turbine generator shutdown procedures.
  10. List and describe those actions that can be taken by operations to minimize efficiency losses.
  11. List abnormal conditions often experienced in operating steam turbine-generators, and for each abnormal condition discussed: Describe any operational symptoms, Describe how the steam turbine-generator is at risk,  Describe typical controls’ automatic response, and describe required (recommended) operator response.
    1. 1 copy of HPC Technical Services' textbook, Combined Cycle Steam Turbine Generator Operation, a $195 value, as written by Harold Parker.  
    2. A "Certificate of Completion" with 2.9 CEUs.

Seminar OUTLINE:

  • Monday
    • Steam Turbine Fundamental Review: Theory, Turbine Sections and Component Descriptions
    • Turbine Systems: Lubricating Oil Systems, Steam Seal Systems and Hydraulic Power Unit.  Emphasis is on the purpose of the system, normal operations, and abnormal operations.
    • Turbine Supervisory Instrument Location & Function: Eccentricity, Speed Detection, Valve Position, Thrust, Vibration, Shell Expansion, Differential Expansion, Metal Temperatures
  • Tuesday
    • Steam Turbine Control Concepts:Speed Control, Load Control, Limiters, Flow Control, Overspeed and Reset System, Overspeed Trip.  Emphasis is on the operators’ perspective of unit operation and operational concepts applied by the OEM.
    • Turbine Normal Operations: Thorough Examination of the Cause and Effect of Thermal Stress, Starting and Loading Procedures (including what the OEM didn’t tell you), Drains, Pre-warming Procedures, Normal Operations, Load Changes, Shutdown
  • Wednesday
    • Minimizing Performance Loss
    • Vibration Analysis as an Indicator of Abnormal Operating Conditions: Oil Whip, Bowed Rotors, Packing Rubs (Low Speed versus High Speed), Mechanical Unbalance, Resonant Vibration, Coupling Unbalance, Cracked Rotors
    • Abnormal Conditions: Detection, Potential Results and Operator Action to Prevent Loss: Loss of Turning Gear, Extended Turning Gear Operation, Inability to Stay on Turning Gear during Prewarm, Abnormal Cooler Discharge Oil Temperatures, Bearing Wipes, Water Induction, Excessive Differential Expansion, Axial Rubs, Low Speed Operation, Sling-Shot Starts, Low Frequency Operation, High Exhaust Hood Temperatures, Vacuum Breaking, Over Pressure, Over Temperature, Loss of Boiler, Inlet Pressure Fluctuations, Valve Oscillation, Governor Bobble, Full-Load Rejection, Hot Restarts, Feedwater Heater Removal
  • Thursday
    • Generator Fundamentals: Principles of a Simple Generator, Principles of Large Generators, Generator Regulation, Active and Reactive Power, Operation of Paralleled Generators, Power Angle Relation and Instability
    • Generator Construction: Stator Assembly and Rotor Assembly
    • Generator Support Systems: Shaft Sealing System and Hydrogen Control
    • Excitation Systems: Introduction to Voltage Regulators, Transient Response of a Voltage Regulator, Stabilizing Circuits
  • Friday
    • Generator Operations: Prior to Startup, Startup, Shutdown, Power Factor Adjustment, Operation of Gas Coolers, Abnormal Operations, Relationship Between Operation, Protection and Alarms, Alarms, Protection when Generator is Off-Line, Tripping Methods, Protective Actions for Generator