Generator Mechanical Design_rA (12-31)

8/12/2019 Generator Mechanical Design_rA (12-31)

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May, 2014

Generator Design Team

This document is the informational asset of Doosan Heavy Industries & Construction. Thus, unauthorized access, revision, distribution and copying of this document are strictly prohibited.

Generator Stator

Mechanical DesignStator


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Generator Stator esign

1. Generator Stator Component

2. Stator Frame

3. Water Header Assembly

4. Dome & H2 Cooler 5. Key & Spring Bar

6. Stator Core Assembly

7. Foundation Plate

8. Collector housing

Generator Stator Parts


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Generator Component

Generator Stator Design

1. Generator Stator Component

12 3

4 5 6 7 8 9

111

1. Rotor

2. Bearing

3. End sh ields

4. Rotor fan

5. Water header

6. Hydrog en cooler

7. Stator fram e

8. Stator co re

9. Stator bar

10. High voltage bushing

11. Current transformer

Stator Major Component

1) Stator Frame And Miscellaneous Components(5,6,7)

2) Outer End Shield Assembly(2,3)

3) Stator Core Assembly(8)


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2. Stator Frame

1) Function :Component Support :

- Stator Core, Stator Bar, End Shield, Rotor, Cooler & Dome, Lower Frame Extension

Pressure Vessel to Seal Hydrogen Gas(Explosion Pressure, Operation Pressure)

Provide Cooling Gas Passage

2) Design Consideration :

Stress : Hydrogen Gas Pressure, Shipping

Load , Abnormal TorqueVibration : Natural Frequency, Vibration

Transfer Mechanism

Ventilation : Cooling Matrix

3) FRAME SHAPE TYPE :

Horizontal Mounted Cooler Design Type

Vertical Mounted Cooler Design Type

Twin Dome Horizontal Cooler Design Type

- Duplex Cooler Type (1000MW Nuclear)

- Simplex Cooler Type(Large Thermal Power)

Full Dome Horizontal Cooler Design(1970)



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Twin Dome Horizontal Cooler Design- Large Thermal Power Plant

4

Vertically Mounted Cooler Design- Thermal Power Plant

Horizontally mounted Cooler Design

- Gas Turbine Plant

Full Dome Horizontal Cooler Design(1970)



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3. Water Header Assembly

1) Function :Pipe Line Supply Stator Bar with Cooling Water


Decision Pipe Size for Necessary

Cooling water Quantity

Pipe Clamping support Vibration and

Water Flow Force

Air Leak Test for Water Leakage

Material : Stainless Steel

3) TYPE :

Single Pass Flow :

Cooling Water Flow supply from CE side

to TE side , then drained Flow Type

Double Pass Flow :Cooing Water supply and drain TE side, only

CE side water return to TE side

(Old Vertical Cooler Type Design)

Water Header



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4. Dome & H2 Cooler

1) Function :

Dome (Top Cover) : H2 Cooler Support & Gas Passage

H2 Cooler : Cooling H2 Gas by heating

Generator operation


Dome (Top Cover) :

- H2 Cooler assembly Space

- Natural Frequency & Stress of Hydrogen PressureH2 Gas Cooling Capacity & Material

3) TYPE :

Dome : Vertical Cooler Mounted Type

(Not Applicable)

H2 Cooler :

- Simplex Type : MD1- Duplex Type : Nuclear Plant



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W/O Wrapper of Dome

4) Warning Point at installation & Applied material :

Clamp End Assembly To Seal H2 Gas tight

H2 Cooler Material

- Tube : 90-10 Cu. Ni Fin : Aluminum

- Tube Sheet & Water Box : Carbon Steel

H2 Cooler Outline



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5. Key & Spring Bar1) Function :

Key Bar : Stator Core Support / Core Stacking

Load SupportSpring Bar : Damp the amplitude of Core to

transfer Stator Frame2) Design Consideration :

Stator Core Vibration : With Magnetic Flux of the rotors

Core the frequency where the electromagnetic force

corresponds to 2 times of synchronous speed

Radial Force : Magnetic ForceTangential Force : Torque Force

2 Pole Core amplitude > 4 Pole Core amplitude3) TYPE :

4 Pole : Welded Key Bar(No Spring Bar)

2 Pole : Bolted Key & Spring Bar Assy

Medium 2 Pole : Welded Key Bar & Spring Bar



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6. Stator Core Assembly

1) Function :

provide a low reluctance path for the magnetic flux, which is generatedin the rotor and which links the armature winding.

Ventilation passage provision(ISSB, OSSB)

Support Stator Bar Assembly


Core Tightness - Periodic Pressing

Core VibrationCore Insulation

3) Import Inspection Fact

Core Insulation Condition & Core Looseness

STATOR FRAME FLANGE

KEY & SPRING BAR ASSY

GAS DUCT(ISSB) PUNCHINGS

OUTSIDE SPACE BLOCK

Step Punching



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Stator Core Assembly Component

1. Stator Core

2. Copper Facing

3. Inside Space Block4. Outside Space Block

5. Stator Flange

6. Gas Gap Baffle

7. Shunt Core

1

2

3

4

5

6

7



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s rnh Khun dp v men trng

6-1. Tmthp


- Chtliuv mng: Thp xilic, dy 0.35mm

- Phnli thp: Sdngl thp srnh uv khe hhnchdng inxoy trong lithp sinh ra nhit.

- Bmt: Phchtcch inC10


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6-2. Phnkhng gian lprp khibn trong


- Vtliu: Thp cc bon, Thp khng r

- Chcnng: Cung cpkhongkhng gian thng thikh H2 giacc li


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6-3. Phnkhng gian lprp khibn ngoi


- Vtliu: Thp khng rbncao

- Chcnng: Gip lccacinhbch chn p lcv tmchn p lcgiali vtmchn p lc.

Truyntili v thng thikh H2


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6-4. Mtbch Stator


- Vtliu: ngstc

- Khng gian bn ngoi tipxc vibmtcdn bngnng cao kha nngchn.- Chcnng: Chn, Ktcubmtng,Cung cpktcudctrc

- Vtliu:ngtinh khit.

- Chcnng: Tthng r ngnsgimnhitv cung cpngxcho kh.

6-5. Bmtng


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7. Cc bnmng

1) Chcnng:

Cung cpcho my pht giasn TG v chn.Hnchsxe dchdctrc

2) Xem xt thitk:

Chuci bnh thng cho khi lng my

pht, Momen tigy ra do ngnmch

3) Bphn :Chn ,bu lng, chm, c vt

4) HthngtmFDN

Thitkkiucht

Thitkkiukeo

Foundation Plate



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8. Hpcgp

1) Chcnng:

bovkch thchngnngatai nningy ra

2) Xem xt thitk :

n: di85dBA

Thng thong

Bovcon ngi

C khnngbodngchithan

3) Kiu:

Kiunithm : Kch thcgnnh

Kiunhtrn tng: Cgp ttrn tng

(Vinnh)

Walk In Type

Reach In Type



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May, 2014

Turbine Generator BU

This document is the informational asset of Doosan Heavy Industries & Construction. Thus, unauthorized access, revision, distribution and copying of this document are strictly prohibited.

Thit k tm chnStator my pht


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1. Thnh phn ca cc tm chn my pht

2. Phn ngoi ca tm chn

3. Lp t phn chn H2

4. B pht hin du r

5.

6. Quy trnh tho r tm chn

7. Quy trnh lp rp tm chn

Generator End Shield

Generator End Shield Design


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1. Thnh phncatmchnmy pht


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1-1. Thnh phncatmchnmy pht


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2. Phnbn ngoi catmchn1) Chcnng:

,Pht hindu,chn H2

ngchtkh H2

2) Xem xt thitk :

xe dchv p lcnn theo p lccakh

H2

rung :Tnstnhin

3) Nghimthu thctlptv bodngKim loivikim loi(Dcv ngang) kh trn

Phn ngoi va khung lp rp da ra tho lun

ngdng cacc thnh phn trn cho chnh

xc

Kimtra rnh du

chn



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3. Lptphnchn H21) Chcnng:

With rotation part the hydrogen gas leak proofwhich leads the clearance between of fixation parts

2) Structure :

Seal Oil Shut tightly H2 Gasbetween Seal Ring

Seal Ring Float by Spring in operation

Seal Casing Assembly Seal H2 Gas by Metal

to Metal Contact

CE Seal Assembly with earth insulationSeal with Oil Deflector assemblies internal

influx Seal Oil

3) Important inspection fact at installation & maintenanceMetal to Metal Assembly difference

Seal Ring inside Babbitt condition &

Permission Clearance (3000rpm : 1.5 times)

Seal Ring and Casing Hook Fit surface

Contact Condition

Insulation Condition (500 Volt Megger Test : 100K

above in operation)



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4. Oil Deflector1) Function :

Rotor Shaft the generator inside and outside

influx or Outflow prevention

- Inner Oil Deflector : Lubricating oil generator internal

influx prevention

- Outer Oil Deflector : Lubricating oil generator external

influx prevention


Design for FunctionFor Oil leakage prevention, Gap between Rotor

diameters and Seal Ring

3) Important inspection fact at installation & maintenanceCheck Tooth Damage

Alignment using Height Screw



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5. Bearing

1) Bearing Classification by shape :

Tilting Pad Bearing : High StabilityElliptical Bearing : High load and low-end operation temperature

3) Bearing Insulation :

Double Insulation Design(Large Generator)

Single Insulation Design(Medium Generator)

4) Important inspection fact at installation

& maintenanceBearing with earth insulation condition (500 Volt

Megger Test : 100Kabove in operation)Bearing Fit Contact Condition

Bearing Torque or Pinch Fit

Gap between Bearing and Journal


Bearing Load to Rotor

Rotor Axial orgin stability

Easy Disassembly & Assembly



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Bearing - CE

5) MD1 Bearing Size :

- Turbine End : 23x 13

- Collector End : 21x 13


Bearing - TE

G t E d Shi ld D i


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6. Procedure for Disassembly of End Shield


Inspect unit for oil leaks

Inspect Outer Oil Deflector to Bearing Cap

Horizontal Joint gap within a 0.038mm Shim(filler gage)

Remove Bearing Cap

Check Clearance between Shaft &Outer Oil Def. Teeth

Upper Bearing Rings are assembled with Bearing Cap

Inspect horizontal joint for oil tightness.

Remove Outer Oil Deflector

Remove Hydrogen Seal

Nominal Clearance: 1.016~1.143mmDia. Clearance : L/S, R/S = 1/2, BOTTOM = 1/3, TOP = 2/3

Inspect teeth damage and inside diameter.

Check Clearance between Shaft & Inner Oil Def. Teeth

Remove the Bearing and Bearing Rings

Nominal Clearance: 1.016~1.143mm

Dia. Clearance : L/S, R/S = 1/2, BOTTOM = 1/3, TOP = 2/3

Check drain back.

Roll out lower half bearing and Bearing Rings

Include Seal Rings and Mid Oil Deflector



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Use Upper End Shield Access Covers

6. Procedure for Disassembly of End Shield

Remove Fan Nozzle Ring Segments

Remove Inner Oil Deflector

Inspect teeth damage and inside diameter.Check drain back.

Remove Upper Half End Shield and Drop Lower Half

End Shield



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Inspect End Shield

Assembled the Lower Half End Shield to the Frame

The Field Weight must be removed

Measure the Tight Gaps of the Lower Half Vertica

Joint

Rest the Upper Half End Shield on the Lower Half

and Dowel

Measure the LooseGapAround the Horizontal Joint

Max. Allowable Gap 0.038mm

When necessary, Check Surface Contact

7. Procedure for Assembly of End Shield

- Clean the Joint Faces- Any Damage to the Sealing Surface

- Remove High Spots and Burrs

75% contact is desired.

- The Field Weight must be removed- Max. Allowable Gap 0.038mm

- 0.038mm feeler gauge may not penetrate the joint for

more than 6.35mm.



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Tighten the bolts on the Horizontal Joint

Make TightGapChecks around the Horizontal Joint

- The Field Weight must be removed

7. Procedure for Assembly of End Shield

Tighten the Bolts on the Upper Half Vertical Joint

Make Tight Gap Checks of the Upper Half Vert. Joint

Inspect for Steps at the Horizontal Joint


Inspect for Steps at the Horizontal Joint

Max. Allowable steps 0.038mm.

- Max. Allowable Gap 0.038mm

- 0.038mm feeler gauge may not penetrate the joint for

more than 6.35mm.

Lower Field Weight onto End Shield




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Documents

Generator Mechanical Design_rA (12-31)