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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)
Generator Stator Design
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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
2) Design Consideration :
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
2) Design Consideration :
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
2) Design Consideration :
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
Generator Stator Design
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s rnh Khun dp v men trng
6-1. Tmthp
Generator Stator Design
- 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
Generator Stator Design
- 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
Generator Stator Design
- 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
Generator Stator Design
- 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
Generator Stator Design
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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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Generator End Shield Design
1. Thnh phncatmchnmy pht
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Generator End Shield Design
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
2) Design Consideration :
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
2) Design Consideration :
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
Generator End Shield Design
Bearing - TE
G t E d Shi ld D i
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6. Procedure for Disassembly of End Shield
Generator End Shield Design
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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Generator End Shield Design
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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Generator End Shield Design
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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Generator End Shield Design
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
Max. Allowable Gap 0.038mm
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
Max. Allowable Gap 0.038mm
Max. Allowable Gap 0.038mm
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