GENERATOR Mech Construction for ETs

7/31/2019 GENERATOR Mech Construction for ETs

1/27

Turbogenerator-An Introduction


2/27

Stator Slot - THDF 500 MW


3/27

Capability of Generator Modules

125/67

800


4/27

Library of Designs

80 MW 1000 MW

AIR COOLED

170 MW

HYDROGEN COOLED

350 MW

WATER COOLED STATOR

1000 MW

660 MW

DESIRED MW CAPACITIES


5/27

THDF Generators - Design features

DIRECT WATER COOLING OF STATOR WINDING AND

DIRECT AXIAL HYDROGEN COOLING OF ROTOR WINDING OPTIMALLY DESIGNED LEAF SPRING SUPPORT FOR CORE

END SHIELD MOUNTED BEARINGS

VPI INSULATION SYSTEM

MASSIVE SUPPORT RING FOR STATOR WINDING OVERHANGTO ABSORB SHORT CIRCUIT FORCES

SIDE AND TOP RIPPLE SPRINGS IN STATOR SLOTS TOCONTAIN BAR BOUNCING FORCES

5 STAGE AXIAL COMPRESSOR AND VERTICAL HYDROGENCOOLERS ON TURBINE END

COLD GAS AND PRIMARY WATER TEMPERATURE CONTROL

VALVES TO MAINTAIN AVERAGE INLET COOLING MEDIUMTEMPERATURES CONSTANT

DOUBLE FLOW RING TYPE SHAFT SEALS

BRUSHLESS EXCITATION SYSTEM


6/27

THRI 108/39 Stator with End Shield & Terminal box


7/27

Main Parts of Turbogenerator

1. Stator - Stator Frame (Fabrication & Machining)

2. Core Assembly - Stator Core, Core Suspension Arrangement3. End Shield

4. Stator Winding Assembly - Stator Winding , Winding Assembly,

Connecting Bus bar

5. Rotor - Rotor Shaft, Rotor Wedges, Rotor Coils, Wound Rotor,

Rotor Assembly

6. Completing Assembly - Bearing Assembly, Shaft Seal Assembly,

Oil Catchers, Insert Cover etc7. Exciter

8. Auxiliary System


8/27


Stator

Stator Core

End Shield

Rotor

Wdg Overhang

Bearing

Shaft Seal

Terminal Bushing

Oil Catcher

Cooler

Rotor fan

Insert

Cover


9/27


Coolers

Terminal bushing

Foundation


10/27

Stator Frame

Rigid fabricated cylindrical frame

Withstands weight of core & wdg, forces & torques during operationNatural frequency away from exciting frequencies

Provision for H2/CO2 filling

Provision for temp measurements

Foot plates for supporting on foundation

provision for H2 coolers


11/27

Stator Frame (500 MW)


12/27

Stator Frame (Fabrication & Machining)


13/27

TURBINE SIDE ENDSHIELD EXCITER SIDE END

SHIELD

STATOR

TEST PRESSURE= 10 BAR FOR 30 MIN

Hydraulic/Pneumatic testing of Stator


14/27

Stator Frame (Air Cooled TG)


15/27

Stator Core

Made up of punched segments of thin sheets of ETS

Punchings coated by insulating varnish

Vent segments at designed intervals for flow of cooling gas

Compressed with tension bolts, pressure plate and clamping fingers

Stepped arrangement at the end for reduction in eddy current losses


16/27

Core Suspension - THRI/THW TG


17/27

Core Suspension - 500 MW


18/27

Core Suspension - Air Cooled TG

Core End Plate

Core Housing

Location forSpring

Core


19/27

End Shield

Closes both ends of Stator Frame

Fabricated rigid box type structure in two parts

Supports and houses bearings

Provision for mounting Shaft seal body, Oil catchers, etc

Provision for supply of Bearing Oil, Seal oil, Thrust oil and its drain


20/27

End Shield - THRI TG


21/27

End Shield (Exciter side 500 MW)


22/27

End Shield (Turbine side 500 MW)


23/27

Bearing Assembly


24/27

Terminal Bushing Box 500 MW


25/27

A VOID FREE HIGH VOLTAGE INSULATION ALON G THE ENTIRE LENGTH OF THE BAR

A MECHANICALY FIRM BOUND BETWEEN ALL WINDING

COMPONENTS AND THE INNER FRAME AND CORE BETTER SUITABILITY AGAINST THERMAL STRESSES DURING OPERATION

BETTER HEAT TRANSFER

LESS INSULATION THICKNESS - SPACE OPTIMIZED

MACHINE LIFE IMPROVES

INCREASE IN GENERATOR EFFICIENCY

INCREASE IN SHORT CIRCUIT RATIO

INCREASE IN LINE CHARGING CAPABILITY

REDUCTION IN SPARES INVENTORY - STATOR BARS AND STATOR SLOT WEDGES ARENO MORE REQUIRED AS SPARES

REDUCTION IN OVERHAULING REQUIREMENTS :

STATOR WEDGE TIGHTNESS CHECKING NOT REQUIRED

LOOSENING OF CORE AND FASTNERS REDUCED

GLUE INJECTION NOT REQUIRED

ROTOR WITHDRAWL DURING INITIAL INSPECTION NOT REQUIRED

New dev - Total Impregnated generator


26/27


27/27

GENERATOR Mech Construction for ETs

Documents

Transcript of GENERATOR Mech Construction for ETs