Agm & Sr. Faculty Member (pmi) Ntpc Ltd.: Dr. K. V. Vidyanandan

Dr. K. V. Vidyanandan AGM & Sr. Faculty Member (PMI) NTPC Ltd. PMI - Noida

[email protected]

NEED FOR TURBINE PROTECTION  A steam turbine being rotating equipment, operating at very high temperature, pressure and speed, is subjected to enormous stresses.

 Deviations in various operating parameters of a turbine may lead to costly damages of various components, resulting in long outages.  Accordingly, a turbine needs to be tripped for the following reasons: 1. To protect the turbine from inadmissible operating conditions 2. To prevent damages in case of plant failure

3. To restrict occurrence of failure to a minimum

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

GOVERNING OIL RACK (KWU- 200 MW)

TRIP GEAR AND REMOTE TRIP SOLENOID

Remote Trip Solenoids

Main Trip Gears

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

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TURBINE PROTECTION (KWU)

Dr. K. V. Vidyanandan

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TURBINE PROTECTIONS (KWU - 500 MW)

FEW TRIPPING SET-VALUES

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

GENERATOR MOTORING  Motoring is the condition in which the turbine is driven by the generator at rated speed with the stop/control valves closed.

 In this operating mode, longer blades of the turbine are heated up due to blading windage.  To prevent heat-up beyond permissible temperatures, motoring must not be allowed to continue for longer than one minute.  If the condenser vacuum is very poor, (i.e. condenser pressure is

high), motoring must not be allowed for more than 4 seconds.

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

FIRE PROTECTION -1

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

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FIRE PROTECTION - 2

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

[email protected]

Dr. K. V. Vidyanandan

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MECHANICAL OVER-SPEED TRIP DEVICE

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

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OVER-SPEED TRIP DEVICE (KWU)

Dr. K. V. Vidyanandan

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OVER-SPEED TRIP DEVICE (KWU)

Overspeed trip bolts Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

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LOW VACUUM TRIP DEVICE

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

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THRUST BEARING TRIP DEVICE 1. Compression spring 2. Bearing pedestal 3. Piston 4. Valve body 5. Turbine shaft 6. Pawl 7. Torsion spring 8. Piston 9. Compression spring 10. Limit switch 11. Knob a: c: u: x:

Dr. K. V. Vidyanandan

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Test Oil Return Oil Aux. Startup Oil Aux. Trip Oil

Dr. K. V. Vidyanandan

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Dr. K. V. Vidyanandan

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ELECT. TURBINE PROTECTIONS (660 MW)

Dr. K. V. Vidyanandan

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Suggestions and feedback are welcome. Dr. K.V. Vidyanandan, AGM & Sr. Faculty Member (PMI), NTPC Ltd., Noida. U.P. [email protected]