generator erection activity - copy

7/31/2019 Generator Erection Activity - Copy

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PRESENTATION ONGENERATOR ERECTION

MAJOR ACTIVITIES


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1. CHECKING OF FOUNDATION

CHECK FOUNDATION wrt. LONGI-TUDINAL AXIS, TRANSVERSE AXIS ANDELEVATION.

CHECK VERTICILITY & LOCATION OFSLEEVES AS PER DRAWING.


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2. PREPARATION OFMACHINERY PART

REMOVAL OF PROTECTIVE COATING.

ATTENDING MINER DAMAGES.


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3. SETTING & ALIGNMENT OF MACHINE

SOLE PLATES

POSITIONING / LEVELING / ALIGNMENTOF SOLE PLATE AS PER DRAWING.

GROUTING OF SOLE PLATE WITH NONSHRINKABLE GROUT CEMENT

CURING OF GROUT CEMENT FORATLEAST 14 DAYS.


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4. VISUAL INSPECTION OF STATOR

Check presence of any foreign materials instator bore, space between stator coreand casing.

Check for any visual damage to statorcore.

Check that all fasteners are tight.

Ensure DC resistance test and IR / PI testof winding completed.


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5. VISUAL INSPECTION OF ROTOR

(Contd.)

Inspect compressor blades and retainingrings for any chipping of metal, dentsmarks, cracks etc.

Inspect journal for pitting and scratches.

Check for positioning of all balancingweights as per its proper looking.

Check locking of all screws in centeringring.


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5. VISUAL INSPECTION OF ROTOR

(Contd.)

Check freeness of all ventilating holes.

Ensure that physical dimension of rotorhave been recorded and checked.

Ensure that DC resistance test, impedancetest and IR of rotor winding have beencompleted and values are within limit.


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6. MOUNTING OF BUSHING

COMPARTMENT

It is flanged to the stator frame at exciterend below the stator frame.

Inserting the bushing compartment intothe foundation.

Mounting the bushing compartment.


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7. INSERTION & REMOVAL OF

HYDROGEN COOLERS

TE stator end shield houses 4 numbershydrogen coolers.

Inspection of generator before placementof H2 cooler.

Hydraulic test of coolers at rated pressure.

Identification & insertion of cooler.


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8. GENERATOR ROTOR INSERTION

Generator rotor supported on end shieldmounted bearing at each end of thestator.

Rotor insertion inside the stator casing iscarried out after stator has been placed onfoundation & its alignment wrt turbinecentre line has been done.

NOTE - Ensure that rotor does not touchany part of stator during threading in.


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9. ALIGNMENT OF GENERATOR

Alignment of generator rotor wrt turbinerotor.

The two shaft must be aligned along theline of their natural deflection (catenary)

Alignment of generator rotor relative to analready aligned turbine shaft perform by acorresponding shifting of generatorhousing in axial & radial direction.


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9. ALIGNMENT OF GENERATOR

(Contd.)

Aligning the generator rotor relative to thestator core.

Positioning the generator rotor in axialdirection.

Aligning the complete shaft line.

Run out check at the coupling. Final tightening of coupling bolts.


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10. MOUNTING AND ALIGNMENT OF

FANS

Circulation of cooling air is obtained by amultistage fan at the turbine in of thegenerator.

Axial & radial clearances is to be checkedbetween fan blades.


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12. MOUNTING OF SHAFT SEAL

Shaft seal is mounted after the generatorrotor has been inserted and afterinstallation of generator upper half end

shield.

Checking the END shield flange face to theSEAL RING CARRIER.


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11. ALIGNING & COUPLING THE EXCITER

ROTOR

Aligning the exciter rotor to an alreadyaligned generator rotor should be done byshifting the base frame of exciter to the

required position.

Alignment of coupling.


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generator erection activity - copy

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