TG509 - (W) 300#/150# Steam Turbine Controls

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2 days - 1.3 Continuing Education Units Awarded


Course Dates Download Brochure PDF
USD 2,495.00


The Westinghouse Mechanical Hydraulic Control System has proven to be a highly reliable and effective means of controlling steam turbine speed and load. It will provide years of trouble free operation if it is properly adjusted and maintained. If not maintained properly, it can be the leading cause of forced outages for the steam turbine. The reliability and availability of the control system can be a matter of skilled routine operations and maintenance activities. Efficient maintenance outages are often the result of thorough job planning and a complete understanding of the necessary skills and procedures. Furthermore, availability is often a function of the plant being able to get the unit "on-line" by resolving obstacles quickly.

Increased availability and reliability can be attained through attendance at HPC's W Mechanical Hydraulic Steam Turbine Control Systems Seminar.

OBJECTIVES:
Upon successful completion of this Seminar the participant should be able to:
  1. Describe the purpose or function of the entire Hydraulic Control System and the features it must have to safely control turbine operation.
  2. Name the major components/sub-systems.
  3. Describe the purpose of each major component and /or sub-system.
  4. Describe how each major component functions within the control system and/or sub-system.
  5. Name and describe the kinds of tools, instructions, drawings, etc. that are required to maintain a particular system.
  6. Describe the general methods and techniques for inspecting, testing, adjusting, and troubleshooting the hydraulic control systems.
Seminar OUTLINE:
  1. Introduction
  2. Control System Overview
    1. Control System
      1. Throttle Valves
      2. Throttle Valve Controller
      3. Interceptor Valves
      4. Reheat Stop Valves
      5. Load Limit Valve
      6. Throttle Pressure Regulator
      7. Overspeed Trip Mechanism
      8. Protective Devices
      9. Overspeed Protection Controller
  3. Control System Functions
    1. Control Block
    2. Oil Impellers
    3. Main Governor Transformer
    4. Load Limit Valve
    5. Governing Emergency Trip Valve
    6. Auxiliary Governor
    7. Dump Valve
    8. Auxiliary governor Settings and Adjustments
    9. Dump Valve Adjustment
  4. Control System Valves
    1. Steam Chest
    2. Governing Valve Servomotor
      1. Adjustments
    3. Governing Valve Servomotor Test Valve
    4. Interceptor Valve
      1. Steam Valve
      2. Servomotor
      3. Solenoid Operated Test Valve
      4. Adjustments
    5. Multiple Orifice and Check Valve
    6. Reheat Stop and Trip Pilot Valve
    7. Throttle Valve
      1. Steam Valve
      2. Servomotor
      3. Adjustments
    8. Throttle Valve Controller
      1. Adjustment - Clutch
      2. Limit of Shaft Travel
      3. Pressure Switches
  5. Control System Overspeed Trip Mechanism
    1. Overspeed Trip Mechanism
      1. Test Procedure
    2. O/S Trip Mechanism Oil Pressure Check Valve
    3. O/S Trip Valve Automatic Latch
  6. Control System Protective Functions
    1. Protective Devices
      1. Low Vacuum Trip
      2. Low Bearing Oil Pressure
      3. Thrust Bearing Trip
      4. Solenoid Operated Trip
    2. Throttle Pressure Regulator
  7. 150# Control Systems
    1. High Pressure Oil System
    2. Control Oil System
    3. Turbine Valve Operating Mechanism
      1. Throttle Valve
      2. Reheat Stop Valve
      3. Interceptor Valve
      4. Governing Control Valve Servomotor
    4. Trip Protection
      1. Auto Stop Valve
      2. Overspeed Trip Mechanism
      3. Hand Trip Lever
      4. Operating or Cylinder
      5. Diaphragm (Sphero) Dump Valves
    5. Governing (Speed and Load) Control
      1. Speed Control vs. Load Control
      2. Governor Impeller
      3. Main Governor
      4. Auxiliary Governor
      5. Load Limit Valve
      6. Throttle Pressure Regulator
      7. Interceptor Valve Interlocking Relay
      8. Auto Stop and Governing Control Valves Emergency Trip Device
  8. Seminar Conclusion