7/25/2019 TURBINE DATA

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BHEL, Hardwar 6.1-0101-97/1

Steam Turbine Technical DataDescr ipt ion Steam & Casing Temperatures

Steam Temperatures

Rated Value,Annual

Average

Long-TermValue, Subject

to Annual

Average

400 hrs.Per Year

80 hrs. Per YearMax. 15 min inIndividual Case Unit

Main Steam atHP Stop Valve inLet

537.0 545.3 551.0 565.0 C

HRH Steam atIP Stop Valve inLet

537.0 545.3 551.0 565.0 C

Steam Temperatures

Rated Value

Long TermOperation

80 hrs. Per Year,Max. 15 min. in

Individual Case

In SpecialCases at

No LoadUnit

HP Turbine Exhaust 337.9 339.9 429.9500.0

C

Extraction 6 337.9 339.9 429.9 500.0

C

Extraction 5 410.0 415.0 450.0 C

Extraction 4 297.2 307.2 347.2 C

Extraction 3 183.8 196.8 243.8 C

Extraction 2 99.3 119.3 164.3 C

Extraction 1 75.4 95.4 145.4C

LP Turbine Exhaust 46.1 70.0 70.0 C

Long-Term Operation: Upper Limit Value Permissible Without Time Limit.

These Values Correspond To 600 MW Load With 3% Makeup and 0.1013 bar Back PressureWith all Heaters in Service and Rated Steam Conditions.

Only Valid For The No Load Period With High Reheat Pressure After Trip-Out From Full LoadOperation. For Individual Case Approx. 15 Minutes.

The Turbine Is Immediately Re-Loaded Or The Boiler Immediately Reduced To Minimum LoadIf No Load Operation Is Maintained.

Casing Metal Temperatures

Wall Temperatures Alarm At Machine Must Be Shut Down At Unit

HP Turbine Casing Exhaust 485 500 C

Outer Casing of LP Cylinder 90 110 C

Spray Water To LP Turbine Must Be Switched On At 900C

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BHEL, Hardwar 6.1-0101-97/2

Casing Metal Temperature Differences

Temperature Difference Alarm At Machine Must Be Tripped At Unit

Between Upper & Lower CasingHalves of HP Turbine, Middle

90 100 C

Between Upper & Lower CasingHalves of IP Turbine, Front

30 45 C

Between Upper & Lower CasingHalves of IP Turbine, Rear

30 45 C

Permissible Differential Temperature between Parallel Steam Supply Lines

No Time Limitation 17 C

Short Time Period (15 min) 28 C

In the Hottest Line the Limitations Indicated for Main and Reheat Steam Temperature must not be Exceeded

Feed Water Heater out of Service

Operation With Feed Water Heaters Out of Service Main Steam Flow, Kg/s(Indicative)

Load,MW

Extraction A6, A5 (Both Strings Out) 454.95 600

Output Limit du ring Testing with Automatic Turbine Tester

Testing of Main Steam Stop and Control Valves < 300 MW

Testing of HRH Steam Stop and Control Valves 300 MW

MotoringMotoring is the condition in which the turbine is driven by the generator at rated speed with thestop and control valves closed. In this operating mode, certain turbine components are heated upby wind age power of the blading.To prevent heat-up beyond permissible temperatures, motoring must not be allowed to continuefor longer than one minute. If the condenser low vacuum limit of 0.3 bars is exceeded, motoringmust not be allowed to continue for more than 4 seconds.