Inspection of steam turbine body (1) Front casing: indication of total turbine expansion, return oil temperature, return oil volume, vibration conditions, synchronizer position, wheel angle of the oil motor position, if the adjustment valve is blocked and oil motor teeth Are the strips working properly and are they clean? (2) Bearings: oil return temperature, oil volume, vibration conditions of all bearings and possible leakage of the oil damper. (3) Cylinder: shaft seal steam supply, unit operation noise, relative expansion, exhaust cylinder vibration and exhaust steam temperature. (4) Generator and exciter: inlet and outlet air temperature, cooling water pressure, temperature of each cooler, oil pressure of sealing tiles and return oil temperature, volume of oilreturn, possible oil leak in the crankcase, internal dual water cooling generator shaft inlet end Water pressure and presence of leaks. (5) Turning equipment: The handle should be placed in the extended position, and the operating power supply should be confirmed to be normal. (6) Automatic main steam valve: indication of the position of the main steam valve and indication of the fluidity of the cooling water. (7) Main dial: pressure and vacuum indication values of steam, water and oil systems, relative expansion difference and axial displacement indication. (8) Hydrogen plate: hydrogen pressure, sealing oil pressure, hydrogen leakage and working conditions of differential pressure valve and balancing valve.
What is the maximum allowable generator winding temperature? What is the temperature of the iron core which ne should not be exceeded?
Inspection of steam turbine body (1) Front casing: indication of total turbine expansion, return oil temperature, return oil volume, vibration conditions, synchronizer position, wheel angle, oil motor position and whether the adjustment valve is stuck. If the oil motor rack is working properly and is clean. (2) Bearings: oil return temperature, oil volume, vibration conditions of all bearings and possible leakage of the oil damper. (3) Cylinder: shaft seal steam supply, unit operation noise, relative expansion, exhaust cylinder vibration and exhaust steam temperature. (4) Generator and exciter: inlet and outlet air temperature, cooling water pressure, temperature of each cooler, oil pressure of sealing tiles and return oil temperature, volreturn oil flow, possible oil leak in crankcase, dual water internal cooling generator shaft inlet end Water pressure and presence of leaks. (5) Turning equipment: The handle should be placed in the extended position, and the operating power supply should be confirmed to be normal. (6) Automatic main steam valve: indication of the position of the main steam valve and indication of the fluidity of the cooling water. (7) Main dial: pressure and vacuum indication values of steam, water and oil systems, relative expansion difference and axial displacement indication. (8) Hydrogen plate: hydrogen pressure, sealing oil pressure, hydrogen leakage and working conditions of differential pressure valve and balancing valve.
The insulation level of the generator stator winding and iron core is F, and the max temperatureimale must not exceed the temperature limit of 105°C.
During the rated operation of the generator, the temperature range of the stator winding and iron core is between 60℃ and 80℃.
Detailed information:
Regulations on generator temperature and temperature rise:
1 The temperature of the generator The bearing outlet oil should not exceed 65. ℃, the bearing temperature should not exceed 80 ℃.
2. The air temperature at the inlet of the generator should not be lower than 20℃, the maximum should not exceed 55℃, and the temperature difference between the two sides should not be greater than 3℃.
3. When the generator inlet air temperature is between +40℃ and +45℃, for every 1℃ increase, the allowable value of stator current will be reduced by 1.5% from the rated value . ?
4. WhenWhen the inlet air temperature isof +45°C, the apparent power of the generator must be reduced by 7.5%.
5. When the inlet air temperature is between +45℃ and +50℃, for every 1℃ increase, the allowable value of the stator current is reduced by 2% from the rated value.
6. When the inlet air temperature is between +50℃ and +55℃, the allowable value of stator current is reduced by 3% from the rated value for every 1℃ increase.
7. The maximum air temperature at the generator inlet must not exceed 55°C. If it exceeds, measures must be taken to reduce the active and reactive loads of the generator. If that doesn't work, please. consult the chief engineer.
8. When the generator inlet air temperature is lower than the rated value, the allowed stator current increases by 0.5% from the rated value for every 1°C decrease. is alsoallowed to increase accordingly, but the generator is only allowed to increase until the inlet air temperature is +10% lower than rated. If the intake air temperature drops further, the current value should not increase any further.
9. The air temperature difference between the generator outlet and inlet should generally not be greater than 25°C. If it exceeds 25°C, the cause must be found.
10. Under normal circumstances, the water temperature at the inlet of the air cooler should not exceed 20℃ and should not be lower than 5℃, or the air cooler should not contain condensation.
11. The maximum air temperature at the generator outlet should not exceed 70℃.
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