TG501 – (GE) Turbine Supervisory Instruments

TG501 – (GE) Turbine Supervisory Instruments

3 days - 21 PDH Credits Awarded



This course provides a working knowledge of each parameter that is monitored by the GE Turbine Supervisory Instrumentation (TSI). The function and location of each detector along with an operational description of its amplifier is discussed. With this knowledge, the participant has the information needed to reliably calibrate, maintain, and troubleshoot the TSI. Additionally, this information enables the participant to qualify the accuracy of the TSI indications to an operator, thereby providing confidence to the operator when important decisions have to be made. This covers those Turbine Supervisory Instruments that were originally installed on GE steam turbines. (Coverage of Bently-Nevada TSI systems is elsewhere in HPC’s catalog). Topical Outline includes: Overview of Steam Turbines, Block Diagrams, Operational Issues, Eccentricity Detector, Speed Detector, Valve Position Detectors, Shell Expansion Detectors, Differential Expansion Detectors, Rotor Expansion Detectors, Vibration Detectors, Alarm and Trip Settings. Recommended for technicians, electricians, and/or engineers who have a responsibility to maintain this equipment at any fossil or nuclear turbine generator installation. Turbine experience is desirable but not necessary. HPC recognizes with each passing year there is less of a demand for this course. We continue to offer it, however, as a service to the industry and we will continue to do so as long as needed.


Upon completion of this course the participant should be able to:
  1. State the purpose and function of the Turbine Supervisory Instrumentation.
  2. List the turbine parameters that are measured by the Turbine Supervisory Instrumentation.
  3. State the purpose and give the general description of the information contained in the Manufacturing Instructions, Internal Connection Diagrams, External Connection Diagrams, and Elementaries.
  4. Explain how the need for Turbine Supervisory Instrumentation is affected by the construction of the turbine, turbine valves and auxiliary systems.
  5. For each detector listed below, describe the function and location of the detector, describe the TSI amplifier, how the signal is modified and outputted.
    • Vibration
    • Vibration Phase Angle
    • Shell Expansion
    • Rotor Expansion
    • Differential Expansion
    • Eccentricity
    • Speed
    • Valve Position
    • Thermocouples - RTDs
  6. Demonstrate the knowledge necessary to calibrate each of the circuits listed above.

Course Dates / Location / Fee

See for detail on the course dates / locations / and registration fees. HPC’s 3-4-2 policy applies: Sign up 3 for the same course/date, pay in advance, and pay for only 2 (the 3rd participant is free)! HPC Technical Services reserves the right to cancel any course/seminar within 10-working days of the scheduled date. Fees are 100% refunded or credited to another Seminar (clients' choice) if HPC should cancel any Seminar. HPC is not responsible for non-refundable airline tickets or other travel expenses under any circumstance.

What you will receive

  1. 1 copy of HPC Technical Services' textbook, (GE) Turbine Supervisory Instruments, as written by Harold Parker and revised by Mike Whisnant.
  2. A "Certificate of Completion" with 21 PDH awarded.

Course Outline


  1. Overview
    1. Block Diagram
    2. Principles of Operation


  1. TSI Interpretation for Operators
    1. Bowed Rotors
    2. Eccentricity Detector
    3. Good/Bad Eccentricity
    4. Speed
    5. Coast Down Times
      1. Abnormal Coast Down
    6. Valve Position Recorder
    7. Vibration Recorder
      1. Equipment
      2. Critical Speeds
      3. Packing Rubs
      4. Thermal Sensitivity
      5. Mechanical Unbalance
      6. Misalignment
      7. Equipment
    8. Shell Expansion
    9. Differential Expansion
      1. Rotor Long
      2. Rotor Short
    10. Rotor Expansion
    11. Steam & Metal Thermocouples
  2. Vibration Circuits
    1. Vibration Detector Probe
    2. Phase Reference Generator
    3. Probe Mounting
    4. Vibration Channel
    5. Vibration Amplifier
    6. Vibration Phase Angle Boards
    7. Setting Alarm and Trip Set Points
    8. Calibration


  1. Eccentricity Detector
    1. Probe Mounting
    2. Eccentricity AC Amplifier
    3. Peak to Peak Amplifier
    4. Balance Adjustments
    5. Checking & Adjusting Zero
      1. Abnormal Coast Down
    6. Response Test
  2. Speed and Valve Position
    1. Hardware
    2. Speed Amplifier
    3. CV Position Amplifier Board
    4. Checking & Adjusting Zero
    5. Span Adjustment
  3. Differential Expansion
    1. Detector
    2. Detector Assembly
    3. Amplifier Board
    4. Calibration
  4. Shell Expansion
    1. Detector
    2. Detector Assembly
    3. Amplifier Board
    4. Calibration
  5. Alarms and Trips
    1. Multi Channel Alarm Board
    2. High / Low Alarm Board
    3. Trip / Low Alarm Board
    4. Calibration
  6. Power Supplies and Test Panel
    1. Circuit Description
    2. Calibration

Frequently Asked Questions

  • Will HPC Technical Services bring this course to our location for our personnel only? YES, call or email Stephen Parker, for a price quotation.
  • Will HPC Technical Services customize the presentation at our site to suit our particular needs?
  • Is HPC Technical Services' textbook available for purchase as a reference document? No, this book relies heavily on print interpretation.
  • What is the cost for HPC Technical Service to deliver this course at our location? Well, of course that can vary, but generally speaking, if you're planning on having 6+ attend, when considering your T&L, it is to your advantage to perform the course at your plant (office). You gain from the customization and price.
  • Can HPC Technical Services perform a functional checkout and calibration of your control system during the upcoming outage OR provide troubleshooting support should it be required? Yes we can. Call or contact Stephen Parker, for our rate sheets and any further information required.

Steam Turbine I&C Maintenance Certification

Those who attend this course are automatically qualified to take HPC Technical Services' Certification Examination. This examination is offered at no additional expense to the participant. An 80% passing grade is required. The examination length will not exceed 2-hours. Those who complete this examination will receive a revised "certificate of completion" that recognizes this accomplishment along with two-copies of a "To Whom It May Concern" letter that states their accomplishment. (Two copies are provided, one for the participants' employer and one for the participants' personal file.) Consult HPC's website,, for detail on this certification program.