Oil Injection of Main Turbine:
- Press Test Valve
- Turn Test Hand-wheel Anticlockwise slowly ( to develop Test Oil)
- Note Turbine Speed, Test Oil Pressure, Primary Oil Pressure when Bolts Operate(Aux Trip Oil becomes 0)
- Press Reset Valve(Aux start up oil develops and Aux trip Oil becomes equal to the value before test)
- Slowly Release Reset valve
- Slowly Release Test Valve
Overspeed
Test of Main Turbine
- Turbine Warm ( TSI expansions values >80% of Full Load )
- MS/HRH Steam Temp must be 30 Deg Superheat & >30 Deg of HP/IP Inner Casing Temp
- Turbine Speed=3000rpm, Heat soaked, Desynchronised
- Excitation OFF, FCB Open
- RTS ATT, Oil Injection(within 15 days AND more than 1 day before the test) has been done prior before actual test
- Actual Speed to be measured using Stroboscope and Speed Sensor
- Two Persons at Front Pedestal. One, for Checking actuation of Trip Bolt; Second, for Tripping Turbine (Speed>3300 rpm)by Hand at Protection Rack near Manual Trip Gear
- Desynchronise turbine, Maintain speed 3000 rpm, Switch Off Excitation, Maintain Steam temperatures(MS =60-65 ksc & 520-540 Deg ; HRH=6-8 ksc & 540 Deg)
- HP Casing Temp/Shaft Temp=520-530 Deg
- Measure TG Speed Using Tachometer, stroboscope ; compare with UCB (Note error)
- Set both Bolt Tripping electrical value at 3300 rpm.
- Speed should be maximised (3100-3150 rpm) through EHC
- Put Machine in Hydraulic using Speeder Gear from Desk
- Raise Starting Device to 100 %
- Droop set at 7% at 100 % Hydraulic Demand
- Raise Turbine speed by speeder Gear to 100 % from Governing Rack
- Further Raise speed by Overspeed Knob
- Note Speed at which Bolt Operate and Primary Oil Pressure at that point
- Put Electrical Overspeed to normal value after Test
Oil
Injection of TDBFP Turbine
- Turbine at 5300 rpm
- Press Test Lever and Lock it ( Tripping of overspeed bypass)
- Open Manual Valve Before DC Valve
- Turn Anticlockwise Regulating valve, Observe Test oil develops
- Note Bolt operation and Record Test oil Pressure
- Turn Clockwise Regulating valve, Test oil becomes 0
- Close Manual valve before DC valve
- Unlock Test Lever and Release
Actual
Overspeed of TDBFP Turbine
- Electrical Overspeed tripping be checked at 3000 rpm
- Turbine Soaked and TSI within 80 % of full Load
- Raise Turbine rpm in step of 20 rpm after 5500 rpm
- Note down speed at which Bolt Operate
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