Outline of E&M Package of 2x20 MW New Umtru Hydropower Project

1L.SHILLA. SE-Generation Circle, MePGCL

UMIam

TURBINE –GENERATOR DATA

L.SHILLA. SE-Generation Circle, MePGCL UMIam

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1 TYPE OF TURBINE FRANCIS VERTICAL

2 RATED OUTPUT 20.5 MW

3 RATED HEAD 65.41 METRE

4 RATED SPEED 250 RPM

5 RATED DISCHARGE 37.5 CUMEC PER UNIT

6 GENERATOR RATING 2X20 MW WITH 10% OVERLOADING

7 TYPE OF INLET VALVE BUTTERFLY (THROUGH FLOW)

8 INLET VALVE DIAMETER 2700 mm

ELEMENTS OF ELECTRO- MECHANICAL

PACKAGE

• Hydraulic Turbine.

• Synchronous Generator.

• Power Transformer.

• Switchyard equipments.

• Control Equipments.

• Auxiliaries- EOT Cranes, Bus duct & 11 kV Switch gear, DC System, VAC, Fire Fighting, Illumination, LTAC and Elevator.

3L.SHILLA. SE-Generation Circle, MePGCL

UMIam

PARTS OF TURBINE

4

Runner

Turbine Shaft

Guide-vaneTop Cover

Stay Ring

Stay-vane

Spiral Case

Draft Tube

Shaft Seal

Guide Bearing Pit Liner

L.SHILLA. SE-Generation Circle, MePGCLUMIam

DRAFT TUBE AND DRAFT TUBE CONE

The draft tube consists of drafttube cone and the draft tube steel platelining.

The draft tube cone is a welded steelplate design and consists of two parts, the

lower and upper cone. The inlet part of theupper cone is made of stainless steel. Thelower part is designed as a dismantling pieceand is mounted to a flange on the draft tube

bend top. It is provided with one manholefor inspection of the runner from below.

The draft tube lining is completely embeddedin concrete.

5L.SHILLA.SE-Generation Circle, MePGCL, UMIam

STAY RING & SCROLL CASING

. The stay ring consists of an upper and a lower ring to which the stay vanes (20 nos.) are welded. The stay vanes are given a favourable hydraulic shape to conduct the water towards the guide vanes with minimal losses.

The stay vanesalso carry the axial forcesinside the scroll casing..

STAY VANESLOWER RING

UPPER RING

6L.SHILLA. SE-Generation Circle, MePGCL

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SCROLL CASING

The water from the penstock

is conducted through the scroll casing

and distributed around the stay ring

and the complete circumference of the

guide vane cascade. The scroll casings

is welded steel plate constructions

The scroll casing is provided

with taps for pressure measurements,

drain, air vent outlets and a Manhole.

The scroll casings are

embedded in reinforced concrete

BEFORE EMBEDMENT

AFTER EMBEDMENT

SCROLL CASING 7L.SHILLA. SE-Generation Circle, MePGCL

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TURBINE PIT LINER

This part of theturbine housed andsupported the Servomotorand other piping of theturbine.

It is installed andleveled at the top of stayring

The pit liner ensuresthe protection of theturbine pit and installationof components such aswalkways, pipes, etc

It is made of weldedsheet steel of 10mm thick.

8L.SHILLA. SE-Generation Circle, MePGCL

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GUIDE VANE CASCADE

The guide vane cascadeis shown in the adjacentfigure. The openings of theguide vanes are adjustable bythe regulating ring, the linksand levers.

The vanes are shapedaccording to hydraulic designspecifications and given asmooth surface finish. Thebearings of the guide vaneshafts are self-lubricated.

Regulating ringlinks lever

Guide vanes

9L.SHILLA. SE-Generation Circle, MePGCL

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TURBINE COVERS

The covers are bolted to the stay ring ofthe scroll casing. They are designed forhigh stiffness to keep the deformationscaused by the water pressure at aminimum..

The upper and lower cover facingsadjacent to the guide vanes are linedwith high tension stainless steel. Theseare fastened to the covers with screws.

The covers are supporting the guide vanetrunnion bearings. The upper coversupports also the regulating ring bearing,the labyrinth ring, the turbine bearingand the shaft seal box. The lower coversupports the draft tube and the labyrinthring.

BOTTOM LINERTOP LINER

TOP COVER BOTTOM COVER

10L.SHILLA. SE-Generation Circle, MePGCL

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TURBINE SHAFT

The shaft is forgedcarbon steel properly heattreated. The shaft is hollowstructure with Integralcoupling flanges forcoupling with runner andgenerator shaft

Friction couplingis provided between therunner and the turbineshaft, and between turbineand generator shaft. Thetwo surfaces are squeezedby the mean of elongationpre-stressed bolts.

Coupling with Generator

Coupling with Runner

SHAFT Bearing Surface

11L.SHILLA. SE-Generation Circle, MePGCL

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Runner: The rotating component of a turbine in which energy conversion takes place.

The runner is cast welded fabricated construction of stainless steel 13Cr-4 Ni. The runner torque is transferred to the turbine shaft through a bolted friction joint.

The crown and band are fitted with liner so that minimum leakage is achieve between the rotating parts and stationery part.

Runner vane

Band(inlet)

Band(outlet)

Crown

12L.SHILLA. SE-Generation Circle, MePGCL

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SHAFT SEAL

Shaft seal is AxialHydrostatic Type. The working shaftseal ensure that the spinning partsare sealed from the pressurizedwater circulating around therunner. In addition there is alsomaintenance seal which is usedwhen the machine stop.

The working seal is designed tohave maim leakage of 100l/min.

The seal is made of phenolic resin.

13L.SHILLA. SE-Generation Circle, MePGCL

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TURBINE GUIDE BEARING

The turbine guide bearing isof Shell type in two parts, lined withbabbit metal. It is fitted to two partsflange having radial holes for oil. Thebearing metal is immersed in oil in arotating sump which is fastenedsecurely to the turbine shaft. Thebearing shell is strongly supported andbolted to the turbine head cover. Thecooling is from the oil in the sump andno external cooling is needed.

The temperature of bearingmetal and bearing oil will not exceed70 degrees and 65 degreescentrigrade.

Lubricating oil grade will be ISO VG-46or equivalent.

14L.SHILLA. SE-Generation Circle, MePGCL

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MAIN INLET VALVE

The main inlet valve ofthe butterfly type is forshutting-off pressure watersupply from the penstock tothe turbine spiral casing. It ishydraulically operated. Itconsist also companionflanges, dismantling joint,bypass, drain and air bleedervalves, operating mechanism..In the closed position thevalve shall be leak tight.

The normal flow througheach Butterfly valve is 37.17m3/s.

Valve Disc Counter Weight

Valve Body

Valve Seal

Through Flow

Servomotor

15L.SHILLA. SE-Generation Circle, MePGCL

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SALIENT FEATURE OF GENERATORi) Numbers Two sets

ii) Type Vertical shaft,

Francis turbine driven,

iii) Rated output 20.00 MW

iv) Continuous overload 22.00 MW

output (110% of rated)

v) Power factor 0.9 lagging

vi) Frequency 50 Hz

vii) No. of phases 3

viii) Rated voltage 11.00 KV

ix) Class of insulation F

xii) Rated speed 250 r.p.m.

xiii) Generator earthing Star point earthed

through distribution transformer.

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CONSTRUCTION FEATURE OF GENERATOR

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1 The generator is umbrella type with combined thrust and guide bearing located

below the rotor.

2 The guide bearing are segment type,12 in number. The thrust bearing is

Kingsbury type with 12 pads.

3 The rotor comprises the hub, spider, rim, fans and the 24 poles with their

windings.The poles are mounted on a pole spider, which is a welded, spoke

wheel. The spider is mounted on the forged steel shaft. Damper bars are built in

the pole faces.

4 The stator core is built with a slotted, laminated iron core that is supported by a

welded steel frame suitably for rigidity.

5 The stator winding is bar type insulated throughout with class ‘F’ insulation

6 8 nos Air Coolers are used for forced-air cooling of stator with an air-to-water heat

exchanger

7 A pneumatic brake and hydraulic jacks are housed at bottom of rotor

8 The generator foundations and housing (barrel) is made of concrete.

STATIC EXCITATION SYSTEM

a) Static Excitation System forSynchronous Generators usesTHYNE 5 with integrate sequencerGMR3

b) The excitation system consists oftwo separate Thyristor convertersets, both with automatic andmanual channel and house inpanel. Excitation transformer(265KVA) is housed seperately.

c) The DC output of the excitationsystem is connected to the fieldwinding of the Generator.

d) The 3 Phase AC Power to theExcitation System is fed from theGenerator Terminals throughExcitation Transformer or from the415 V AC station supply

AVR

18L.SHILLA. SE-Generation Circle, MePGCL

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TRANSFORMER

19L.SHILLA. SE-Generation Circle, MePGCL

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UNIT AUXILIARY TRANSFORMER11/0.415 KV, 500 KVA, ONAN

STATION SERVICE TRANSFORMER11/0.415 KV, 500 KVA, ONAN

GENERATING TRANSFORMER11/132 KV, 24.5 MVA, ONAF

L.SHILLA. SE-Generation Circle, MePGCLUMIam

SWITCHYARD INCOMMING BAY

CT & BREAKERISOLATORS

21L.SHILLA. SE-Generation Circle, MePGCL

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OUTGOING BAYSWITCHYARD OUTGOING BAY 22L.SHILLA. SE-Generation Circle, MePGCL

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L.SHILLA. SE-Generation Circle, MePGCL UMIam

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UNIT CONTROL BOARDRTU PANELS

GENERATOR CONTROL PANEL