TG503 - (GE-LSTG) EHC Mk-I Steam Turbine Controls

5 days - 3.2 Continuing Education Units Awarded

The EHC System is divided into 3 major sections that involve the control of the turbine. These are Speed, Load, and Flow. This Seminar explains the purpose of each input and output signal of a given section along with an operational description of its functionality with respect to the control of the turbine. After a thorough discussion of each section, the association of each section to another is explained to provide a working knowledge of the EHC System in that the attendee knows the HOW, WHEN, and WHY of the signals used to control the valves; signals used for testing the various components of the turbine; and signals used for safeguarding the turbine. Insight into the design criteria of the circuits, priorities for calibration, sequence of calibration, calibration techniques, and need for accuracy is given as only a HPC Certified Instructor can accomplish.

Has an upgrade been considered for your EHC Mark-I? If so, this Seminar provides some useful information. When is an upgrade inevitable? What benefits are to be gained from an upgrade? Which vendor does one choose? How does one start in preparing for an upgrade? From the information gathered and learned from the Steam Turbine Controls Upgrade Seminar that HPC sponsored in June of 2002, these questions and more will be discussed.

Recommended for Engineers and E&I Technicians.

Note: This Seminar, normally 7-days in length, has been trimmed to fit a 5-day format. To accomplish this, several topics are listed as advance self-study, and HPC will forward advance reading materials to registrants to support this effort.

Seminar OUTLINE

1. Introduction
2. Control Panel Operation (Advance Study Assignment, Q&A only in Lecture)
3. Valve Actuators
4. Front Standard Operating Mechanisms
5. Hydraulic Power Unit (Advance Study Assignment, Q&A only in Lecture)
6. Operational Amplifiers (Advance Study Assignment, Q&A only in Lecture)
7. Print Systems
8. Input and Power Grounding System
   1. Power Supplies
   2. Grounding Systems
   3. Monitoring
9. Signal Control Path
   1. Speed Control Unit
   2. Low Value Gates
   3. Speed / Acceleration Reference
   4. Frequency / Voltage Converters
   5. Wobbulator
   6. Backup Overspeed Trip
   7. Trip Anticipator
   8. Circuit Calibration
   9. System Logic
10. Load Control Unit
    1. Stop Valve Amplifier
    2. Intercept Valve Amplifiers
    3. Control Valve Amplifier
    4. Load Reference Amplifier
    5. Load Limit / Runback
    6. Stage Pressure Feedback
    7. FA / PA Circuits
    8. Power Load Unbalance
    9. Early Valve Actuation
    10. Load Control Unit Logic
    11. Calibration Procedures
11. Flow Control Unit
    1. Valve Position Units
    2. EL vs. EF
    3. Diode Function Generators
    4. Crack Points
    5. Valve Setting Procedures
    6. Valve Test Logic
12. Alarm & Trip Logic
    1. Individual Trips
    2. MTS
    3. MTSV
13. Line Up Instructions
14. Maintenance
15. Troubleshooting
16. Upgrading the EHC
    1. Inevitable
    2. Vendor Choice
    3. Benefits Gained
    4. How To Start
17. Seminar Conclusion

Satisfied Clients include: Alliant Energy - Duane Arnold Energy Center, Central Illinois Light Company - Edwards and Duck Creek Stations, Commonwealth Edison - Dresden, LaSalle & Quad Cities Nuclear Plants, Duke Energy - Oconee Nuclear Plant, GPU/Nuclear - Hope Creek, New England Power - Salem Harbor, MidAmerican Energy - Neal, New York Power Authority - Fitzpatrick Nuclear Plant, Niagara Mohawk Power - 9 Mile Point #2, Northern California Power Agency, PacifiCorp - Huntington Canyon, PECO Energy - Limerick Nuclear Station, Pennsylvania Power - Bruce Mansfield, Pennsylvania Power & Light - Susquehanna NES, Southern Nuclear Company - Plant Hatch