ELECTRO EMPERICAL
FOR E
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DOS & DON’TS FOR 210 MW TURBO GENERATORS & ITS AUXILIARIES BEFORE START UP & DURING OPERATION
BEFORE STARTUP
MAIN T.G.
DOS
1. Check IR value & polarization index of stator winding w.r.t body as well as w.r.t other phases. Megger used is 1000 volts.
2. Check IR value rotor winding with 500 volt megger.
3. Check IR value of generator bearing pedestals on exciter side and that of the seal oil and lubricating oil pipelines.
4. Check up IR values of various RTD’s.
5. Check the lubricating oil is flowing through the generator bearing.
6. Check that oil is flowing through the shaft seals of the generator.
7. Check that inlet valves of TG gas coolers are fully open and water flow through gas coolers is regulated by outlet valves only.
8. Check the functioning of the various instruments connected with main TG.
9. Check the tension of brushes on T.G. slip rings.
10. Check that de-mineralized water of required specific resistivity and pressure is flowing through the T.G. stator winding.
DON’TS
1. Don’t run the machine if the IR and PI value of stator and rotor winding is less than the specified values.
2. Do not run the machine in air medium.
3. The outlet temperature of bearing oil should no case be more than 65C.
4. Do not close the generator field breaker.
5. Do not run the machine if the specific resistivity of the D.M water flowing through the stator winding is less than the specified values.
SEAL OIL SYSTEM
DOS
1. When pressure inside the casing is about 0.2 Kg/cm2 switch on thrust oil supply first; then seal oil supply should put ‘ON”.
2. Check the interlocking of A.C & D.C seal oil pumps.
3. Check the functioning of float valve in the hydraulic seal.
4. Check the oil filter is clean
5. Check the setting of DPR (Differential Pressure Regulator) and D.O.R (Pressure Oil Regulator).
6. Check the following various alarm settings:-
a) Low oil level in damper tank.
b) Emergency oil level in damper tank.
c) Low pressure of seal oil.
d) Low oil level in hydraulic seal.
e) High oil level in hydraulic seal.
7. Check for the flow of cooling water through seal oil coolers.
8. Check the functioning of NRV’s (Non Return Valve)
9. Check the correct functioning of alarm annunciations of ILI’s (Induction Liquid Indicators).
10. Check the various pressure gauges & ECPG’s (Electronic Contact Pressure Gauges) for zero errors and calibration.
DON’TS
1. Do not supply differential pressure to shaft seals before thrust pressure.
11. Do not start the set if the interlocking between A.C & D.C seal oil pumps is faulty.
STATOR WATER COOLING SYSTEM
DOS
1. Check the correct functioning of interlocks between stator water circulating pumps.
2. Check for the correct functioning of differential pressure transducers.
3. Check that the secondary cooling water is in operation.
4. Check for the correct functioning of the non-return valves.
5. Check that water flows through winding is of the required parameter as to discharge, pressure and temperature.
6. Check for zero error & calibration of the various pressure gauges connected in system.
7. Check for the correct pressure of stator water at the outlet of working pumps A & B
8. Check for the correct functioning and alarm setting of specific resistivity meter.
9. Check that the magnetic filter and stator water filters are clean.
10. Check for the correct functioning of level regulator in expansion tank.
DON’TS
1. Do not run the TG set if interlocks between the stator water circulating pumps are not O.K.
2. Do not run the machine if the specific gravity of the stator water is less than the specified minimum value.
GAS SYSTEM
DOS
1. Check for the passing & setting of the safety valves on the carbon dioxide and hydrogen manifolds.
2. Check for the hydrogen leakage on the various joints of the T.G., hydrogen drier and pipes connected in the gas system.
3. Check the condition of silica gel in the hydrogen drier. It should be of bluish colour.
4. Check for the purity of hydrogen inside the T.G. casing.
5. Check for the zero error & calibration of the purity meter.
6. Check for the correct functioning of differential pressure transducer indicating the differential between & seal oil.
DON’TS
1. The hydrogen purity should not less than 97%.
2. The colour of the silica gel in the hydrogen drier should not be pinkish.
3. The leakage of hydrogen from TG casing pipings should not be more than 1mm of the mercury column / hour.
DURING OPERATION
MAIN T.G
DOS
1. Check for the bearing vibrations in all the directions.
2. Check for the sparking on the T.G. slip rings.
3. Check for the temperature of the bearing babbit, seal babbit and drain oil.
4. Check for the temperature of stator winding, core iron, hot gas & cold gas.
5. Check for the daily gas consumption.
6. Check for presence of moisture.
7. Check for the rotor winding copper temperature.
8. Check for temperature and pressure of the cooling water at inlet and outlet of hydrogen coolers.
9. Check for hydrogen pressure inside the T.G. casing during running.
DON’TS
1. Do not allow the rotor winding and stator winding temperatures to exceed the limits.
2. Do not allow the specific of the water flowing through the stator windings to be lower than the specified values.
3. Do not run the machine continuously at lower hydrogen pressure.
4. The bearing & shaft seal babbit temperatures should not exceed 75C.
5. The bearing drain oil temperatures should not be more than 65C.
6. Do not allow oil or dust to settle on the insulation of bearings, oil seals, sliprings and brush gear.
7. Do not allow the machine to run if any abnormal noise inside TG casing or rubbing action is heard.
SEAL OIL SYSTEM
DOS
1. Check periodically interlocking of A.C & D.C seal oil pumps.
2. Check the pressure at following points:-
a) Pressure of governing oil
b) Pressure of lubricating oil
c) Pressure after oil filter
d) Pressure drop across filter
e) Pressure before D.P.R
f) Pressure after D.P.R
g) Pressure before P.O.R
h) Pressure after P.O.R
i) Pressure at exciter and turbine end seals.
3. Check working of exhaust fan with main drain for proper functioning.
4. Check flow from seal drains through visual window.
5. Check purity of seal oil.
6. Check cooling of sealing gland of A.C & D.C seal oil pumps.
7. Check the level in the hydraulic seal every hour and correct in case of abnormality.
DON’TS
1. Do not run the machine when the differential pressure is less than 0.5 Kg/cm2.
2. Seal linear babbit temperatures should not exceed 75C.
3. Temperature of process water at inlet to seal oil cooler should not exceed 33C.
STATOR WATER COOLING SYSTEM
DOS
1. Check the rated temperature of D.M. water at he inlet of stator winding i.e. 40 + 5C.
2. Check the flow of water through stator winding (27 M3 / hour).
3. Check the pH value of stator water; it should be 7.0.
4. Check the resistivity of the water flowing through the stator winding.
5. Check interlocks between the pumps circulating water through the stator winding.
6. Check the vacuum inside the expansion tank ( It should be 250 – 300 mm of mercury column)
7. Clean periodically the filters and magnetic filters by taking into operation the standby filters.
8. Maintain the records of moisture content inside the casing by sampling the hydrogen at regular intervals.
DON’TS
1. Do not run the machine without water flowing through the stator windings.
2. Do not run the machine if specific resistivity of stator winding water falls to 80K/cm.
3. Do not run the machine when the distillate flow to stator winding is 13 M3/ hour.
4. The maximum temperature at the outlet of the stator winding should in no case be more than 85C.
GAS SYSTEM
DOS
1. Check purity of hydrogen( Minimum 97%)
2. Check colour of the silica gel periodically; reactivate if necessary.
3. Check presence of liquid inside the casing by viewing the drain at 0.0 ML.
4. Check the cold gas temperature.
5. Check the working of gas analyzer.
6. If the hydrogen consumption is more than 3 to 4 cylinders per day, check leakage.
7. Continuous availability of control supply should be ensured.
DON’TS
1. Maximum permissible moisture content should not be more than 15 gms/M3 of hydrogen.
2. The purity of hydrogen should not be less than 97%.
3. Do not operate the machine in air media.
4. The temperature of hot gas should exceed 75C.
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DOS & DON’TS FOR 210 MW TURBO GENERATORS & ITS AUXILIARIES BEFORE START UP & DURING OPERATION
BEFORE STARTUP
MAIN T.G.
DOS
1. Check IR value & polarization index of stator winding w.r.t body as well as w.r.t other phases. Megger used is 1000 volts.
2. Check IR value rotor winding with 500 volt megger.
3. Check IR value of generator bearing pedestals on exciter side and that of the seal oil and lubricating oil pipelines.
4. Check up IR values of various RTD’s.
5. Check the lubricating oil is flowing through the generator bearing.
6. Check that oil is flowing through the shaft seals of the generator.
7. Check that inlet valves of TG gas coolers are fully open and water flow through gas coolers is regulated by outlet valves only.
8. Check the functioning of the various instruments connected with main TG.
9. Check the tension of brushes on T.G. slip rings.
10. Check that de-mineralized water of required specific resistivity and pressure is flowing through the T.G. stator winding.
DON’TS
1. Don’t run the machine if the IR and PI value of stator and rotor winding is less than the specified values.
2. Do not run the machine in air medium.
3. The outlet temperature of bearing oil should no case be more than 65C.
4. Do not close the generator field breaker.
5. Do not run the machine if the specific resistivity of the D.M water flowing through the stator winding is less than the specified values.
SEAL OIL SYSTEM
DOS
1. When pressure inside the casing is about 0.2 Kg/cm2 switch on thrust oil supply first; then seal oil supply should put ‘ON”.
2. Check the interlocking of A.C & D.C seal oil pumps.
3. Check the functioning of float valve in the hydraulic seal.
4. Check the oil filter is clean
5. Check the setting of DPR (Differential Pressure Regulator) and D.O.R (Pressure Oil Regulator).
6. Check the following various alarm settings:-
a) Low oil level in damper tank.
b) Emergency oil level in damper tank.
c) Low pressure of seal oil.
d) Low oil level in hydraulic seal.
e) High oil level in hydraulic seal.
7. Check for the flow of cooling water through seal oil coolers.
8. Check the functioning of NRV’s (Non Return Valve)
9. Check the correct functioning of alarm annunciations of ILI’s (Induction Liquid Indicators).
10. Check the various pressure gauges & ECPG’s (Electronic Contact Pressure Gauges) for zero errors and calibration.
DON’TS
1. Do not supply differential pressure to shaft seals before thrust pressure.
11. Do not start the set if the interlocking between A.C & D.C seal oil pumps is faulty.
STATOR WATER COOLING SYSTEM
DOS
1. Check the correct functioning of interlocks between stator water circulating pumps.
2. Check for the correct functioning of differential pressure transducers.
3. Check that the secondary cooling water is in operation.
4. Check for the correct functioning of the non-return valves.
5. Check that water flows through winding is of the required parameter as to discharge, pressure and temperature.
6. Check for zero error & calibration of the various pressure gauges connected in system.
7. Check for the correct pressure of stator water at the outlet of working pumps A & B
8. Check for the correct functioning and alarm setting of specific resistivity meter.
9. Check that the magnetic filter and stator water filters are clean.
10. Check for the correct functioning of level regulator in expansion tank.
DON’TS
1. Do not run the TG set if interlocks between the stator water circulating pumps are not O.K.
2. Do not run the machine if the specific gravity of the stator water is less than the specified minimum value.
GAS SYSTEM
DOS
1. Check for the passing & setting of the safety valves on the carbon dioxide and hydrogen manifolds.
2. Check for the hydrogen leakage on the various joints of the T.G., hydrogen drier and pipes connected in the gas system.
3. Check the condition of silica gel in the hydrogen drier. It should be of bluish colour.
4. Check for the purity of hydrogen inside the T.G. casing.
5. Check for the zero error & calibration of the purity meter.
6. Check for the correct functioning of differential pressure transducer indicating the differential between & seal oil.
DON’TS
1. The hydrogen purity should not less than 97%.
2. The colour of the silica gel in the hydrogen drier should not be pinkish.
3. The leakage of hydrogen from TG casing pipings should not be more than 1mm of the mercury column / hour.
DURING OPERATION
MAIN T.G
DOS
1. Check for the bearing vibrations in all the directions.
2. Check for the sparking on the T.G. slip rings.
3. Check for the temperature of the bearing babbit, seal babbit and drain oil.
4. Check for the temperature of stator winding, core iron, hot gas & cold gas.
5. Check for the daily gas consumption.
6. Check for presence of moisture.
7. Check for the rotor winding copper temperature.
8. Check for temperature and pressure of the cooling water at inlet and outlet of hydrogen coolers.
9. Check for hydrogen pressure inside the T.G. casing during running.
DON’TS
1. Do not allow the rotor winding and stator winding temperatures to exceed the limits.
2. Do not allow the specific of the water flowing through the stator windings to be lower than the specified values.
3. Do not run the machine continuously at lower hydrogen pressure.
4. The bearing & shaft seal babbit temperatures should not exceed 75C.
5. The bearing drain oil temperatures should not be more than 65C.
6. Do not allow oil or dust to settle on the insulation of bearings, oil seals, sliprings and brush gear.
7. Do not allow the machine to run if any abnormal noise inside TG casing or rubbing action is heard.
SEAL OIL SYSTEM
DOS
1. Check periodically interlocking of A.C & D.C seal oil pumps.
2. Check the pressure at following points:-
a) Pressure of governing oil
b) Pressure of lubricating oil
c) Pressure after oil filter
d) Pressure drop across filter
e) Pressure before D.P.R
f) Pressure after D.P.R
g) Pressure before P.O.R
h) Pressure after P.O.R
i) Pressure at exciter and turbine end seals.
3. Check working of exhaust fan with main drain for proper functioning.
4. Check flow from seal drains through visual window.
5. Check purity of seal oil.
6. Check cooling of sealing gland of A.C & D.C seal oil pumps.
7. Check the level in the hydraulic seal every hour and correct in case of abnormality.
DON’TS
1. Do not run the machine when the differential pressure is less than 0.5 Kg/cm2.
2. Seal linear babbit temperatures should not exceed 75C.
3. Temperature of process water at inlet to seal oil cooler should not exceed 33C.
STATOR WATER COOLING SYSTEM
DOS
1. Check the rated temperature of D.M. water at he inlet of stator winding i.e. 40 + 5C.
2. Check the flow of water through stator winding (27 M3 / hour).
3. Check the pH value of stator water; it should be 7.0.
4. Check the resistivity of the water flowing through the stator winding.
5. Check interlocks between the pumps circulating water through the stator winding.
6. Check the vacuum inside the expansion tank ( It should be 250 – 300 mm of mercury column)
7. Clean periodically the filters and magnetic filters by taking into operation the standby filters.
8. Maintain the records of moisture content inside the casing by sampling the hydrogen at regular intervals.
DON’TS
1. Do not run the machine without water flowing through the stator windings.
2. Do not run the machine if specific resistivity of stator winding water falls to 80K/cm.
3. Do not run the machine when the distillate flow to stator winding is 13 M3/ hour.
4. The maximum temperature at the outlet of the stator winding should in no case be more than 85C.
GAS SYSTEM
DOS
1. Check purity of hydrogen( Minimum 97%)
2. Check colour of the silica gel periodically; reactivate if necessary.
3. Check presence of liquid inside the casing by viewing the drain at 0.0 ML.
4. Check the cold gas temperature.
5. Check the working of gas analyzer.
6. If the hydrogen consumption is more than 3 to 4 cylinders per day, check leakage.
7. Continuous availability of control supply should be ensured.
DON’TS
1. Maximum permissible moisture content should not be more than 15 gms/M3 of hydrogen.
2. The purity of hydrogen should not be less than 97%.
3. Do not operate the machine in air media.
4. The temperature of hot gas should exceed 75C.
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