City of Tallahassee
Power Plant Operator
Job Performance Measure
Plant Operator Hopkins Electric Generator System TH-HOP-16
Performance Measure: Electric Generator System
Name:
All Parts Satisfactorily Completed:
(Examiner’s Signature) (Date)
Supervisor’s Comments: ______
______
______
______
References:
1. Training Electric Generator System TH-HOP-16
Materials Needed:
1. Pencil
2. System Description – Electric Generator System TH-HOP-16-SD
3. System Operating Procedure – Electric Generator System TH-HOP-16-SOP
4. Associated Operator Route Check List
Safety/Environmental:
1. Wear hard hats, safety glasses, safety toe shoes, and ear plugs as required.
2. Discuss safety and environmental hazards associated with operating the system.
3. Discuss any unusual operating conditions associated with the system.
Note: Always observe all plant safety rules in accordance with City of Tallahassee Safety and Health Procedures and all Federal, State and/or Local OSHA Standards.
Part A: Location of System Components
Conduct a walkthrough of the Electric Generator System.
Locate, identify, and describe the operational function of the components listed below for the combustion turbine generator and steam turbine generator:
1. Electric Generator
2. Brushless Exciter
3. Permanent Magnet Generator
4. AC Exciter
5. Rectifier Assembly
6. Generator Shaft Seals
7. Air Side Seal Oil Pump
8. Turbine Lube Oil Backup Control Valves
9. Air Side Seal Oil Backup Pump
10. Hydrogen Side Seal Oil Pump
11. Seal Oil Coolers
12. Hydrogen Side Drain Regulator
13. Generator Bearing Drain (Loop Seal) Tank
14. Generator Bearing Oil Drain Line Vapor Extractor
15. Hydrogen Bulk Storage and Supply Manifold
16. Carbon Dioxide Storage and Supply Manifold
17. Hydrogen Distribution Tube
18. Carbon Dioxide Distribution Tube
19. Hydrogen Monitoring System
20. Gas Dryer
21. Liquid Level Detectors
Satisfactorily Completed ______
Part B: Location of Local Control Panels and Breakers
Conduct a walkthrough of the Steam Turbine System. Locate, identify and describe the operational function of the Steam Turbine System local control panels and breakers.
Generator Control Panel
Lube Oil Conditioner Hydrogen Control Panel
Satisfactorily Completed ______
Part C: Place the Generator Seal Oil System in Service
Using the following steps, demonstrate how to place the generator seal oil system in service. Explain your actions at each step.
Explain Your Actions1. VERIFY electrical lineup. / L
2. VERIFY the seal oil system valves are aligned. / L
3. CLOSE turbine lube oil backup supply valves. / L
4. START the air side seal oil pump. / L
5 Verify hydrogen side drain regulator level increases. / L
6. VERIFY hydrogen side drain regulator level is maintained by drain and fill valves. / L
7. CLOSE the air side seal oil outlet valve. / L
8. ADJUST the air side seal oil pump relief valve until the pressure indicator reads 100 psig. / L
9. OPEN the air side seal oil outlet valve. / L
10. ADJUST the differential pressure regulator to bring air side seal oil pressure to 12 psig above gas pressure. / L
11 START the hydrogen side seal oil pump. / L
12. CLOSE the hydrogen side seal oil valves. / L
13. CLOSE the hydrogen side seal oil recirc valve. / L
14. ADJUST the hydrogen side seal oil pump relief valve until the pressure indicator reads 100 psig. / L
15. OPEN the hydrogen side seal oil valves. / L
16. ADJUST the regulating valves until the associated pressure gauges read ± 2” H2O. / L
17. ADJUST the backup main oil pressure regulating valve to a 125 psig outlet. / L
18. OPEN the turbine oil backup supply valves. / L
19. STOP the air side seal oil pump. / L
20. ADJUST the backup supply regulator to maintain the seal oil supply at 8 psig above hydrogen pressure. / L
21. RESTART the air side seal oil pump. / L
22. OPEN pressure switch PS-8 test valve. / L
23. When pressure on the associate indicator reaches 5 psi, VERIFY the air side seal oil backup pump starts. / L
24. CLOSE the pressure switch PS-8 test valve. / L
25. STOP the air side seal oil backup pump. / L
26. STOP the hydrogen side seal oil pump. / L
27. VERIFY the HYDROGEN SIDE SEAL OIL PUMP OFF alarm at the Hydrogen Control Panel. / L
28. RESTART the hydrogen side seal oil pump. / L
Part D: Synchronize the Generator Manually
Using the following steps, demonstrate how to manually synchronize the generator. Explain your actions at each step.
Explain Your Actions1. VERIFY the generator is filled with hydrogen with at least 95% purity and a pressure of 50 psig. / L
2. VERIFY the generator seal oil system is in service. / L
3. VERIFY the turbine is at synchronous speed, 3,600 rpm. / L
4. VERIFY the generator is ready for synchronization. / L
5 CLOSE the generator field breaker. / L
6. VERIFY the field voltage rises to the no-load value. / L
7. PLACE the synchroscope to the bus that will be synchronized, east or west. / L
8. PLACE the synchronizing bus switch for the proper bus in the MANUAL position. / L
9. VERIFY the power transformer disconnects are closed. / L
10. ADJUST the “INCOMING” voltage slightly higher than the “RUNNING” voltage by 200 – 400 volts. / L
11 ADJUST the turbine speed slightly above system frequency. / L
12. When the scope hand reaches the 12 o’clock position, CLOSE the selected generator breaker, east or west. / L
13. CLOSE the remaining generator breaker. / L
14. RAISE load of generator to 5% for the hold period. / L
15. PLACE the voltage (WTA) regulator in service. / L
16. VERIFY generator operation. / L
17. INCREASE load as desired. / L
18. VERIFY the seal oil coolers are maintaining seal oil temperature between 80 and 120 °F. / L
19. READJUST the differential seal oil pressure regulator, if necessary, to establish seal oil pressure at 12 psi above the hydrogen gas pressure. / L
20. OPEN the seal oil hydrogen side recirculation valve until pressure indicators give a steady reading. / L
21. ADJUST the regulating valves until the associated pressure gauges read ± 2” H2O. / L
Part E: Shut Down the Generator
Using the following steps, demonstrate how to shut down the generator. Explain your actions at each step.
Explain Your Actions1. VERIFY the generator is no longer required for service. / L
2. REDUCE generator load to 5%. / L
3. REMOVE the voltage regulator from service. / L
4. ADJUST voltage and base of WTA as required. / L
5 OPEN both generator breakers. / L
6. REMOVE voltage from the field. / L
7. OPEN the generator field breaker. / L
8. If required, TRIP or SHUTDOWN the steam turbine. / L
9. REPLACE hydrogen with carbon dioxide. / L
10. If required, SHUTDOWN the seal oil systems. / L
11. For extended shutdown, FILL the generator with air. / L
ALARM CONDITIONS
Alarms / Initiating Device(s) / Device Setpoint(s
Control Room (BTG) Alarms
Hydrogen Annunciator Panel Alarm / Hydrogen Panel
Exciter Switchgear Alarm / Relay
Field Breaker Trip Alarm / Relay
Control Room (Generator Panel) Alarms
Generator is Motoring / Relay
Generator Loss of Field / Relay
Generator Ground Fault / Relay
HP 112/113 (Generator Breaker) Failure / Relay
86G Relay Trip / Relay
86T Relay Trip / Relay
Exciter Power No. 1 or 2 Firing Circuit / Relay
Exciter Pulse No. 1 or 2 Firing Circuit / Relay
Exciter Auto Trip / Relay
Exciter Regulator Trip / Relay
Exciter Forcing Alarm / Relay
Exciter Maximum Excitation Timing / Relay
Exciter Field Ground Detector / Relay
Exciter Volts/Hertz Limiting / Relay
Hydrogen Control Panel
Hydrogen Purity High/Low / Purity Meter
Hydrogen Pressure High / Hydrogen Pressure Transmitter
Hydrogen Supply Pressure Low / PS-3
Water Detector High / ASH614A/B/C
Hydrogen Temperature High / n/a
Defoaming Tank Level High / LS-6
Air Side Seal Oil Pump Off / PDS-7
Seal Oil Pressure Low / PDS-8
Hydrogen Side Level Low / LS-9
Seal Oil Turbine Backup Pressure Low / PS-10
Hydrogen Side Seal Oil Pump Off / PDS-11
Air Side Seal Oil Backup Pump Running
Satisfactorily Completed ______
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