component of power house

8/8/2019 Component of Power House

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OPERATING MECHANISM

1. Valve Servomotor

2. Pressure Oil System

3. Compressed Air System



ADVANTAGES OF

SPHERICAL VALVE

1. Shape is well suited to resist even

the highest pressure.2. Hydraulic losses are negligible.

3. Closure is good.



BY

PASS VALVE

Should be sufficient to balance the

downstream pressure at least by 60 percent of the upstream pressure,

considering the maximum leakages

through the guide vanes.



AIR VALVEThe size of the air valve should be

sufficient to release of admit air according to rate of filling or draining of

water in the spiral casing/ distributor .



PICTORIAL

REPRESENTATIONOF VALVES



BUTTERFLY VALVE



VALVE GALLER Y



GOVERNOR

Quality of power depends on:

Frequency

Voltage

These need to be regulated properly for

stable and accurate output for good

performance.

Governing system is used for

regulating frequency and power

output.



R equirement of governor characteristicsdepend on following external and internal

factors:

1.External factors: Connected Power system

network. Type of load in Interconnected

power system .

2.Internal factors: Changes/Disturbances in

long water conductor system



REQU

IREMENTS1. Precision

2. R eliability3. Stability

4. Sensitivity



FACTORS AFFECTING

GOVERNING PERFORMANCE

1.Unit acceleration time (Tm)

This is the time in seconds to accelerate the

unit from standstill to normal speed. It is a

measure of sensibility of the unit on loadchanges.

Given by:

Tm = WR 2n2/(9.08*104*N)WR 2= flywheel effect of generation in kg-m2

n= R otational speed

N= Turbine capacity in kW



2.Inertia of water mass (TW)

Higher inertia of water masses leads tounstable governing. Where the water

conductor system is long, Surge tanks are

provided.

Given by,

TW= LV/(g*h)

Where,

L= length of water conductor in m

V= velocity in m/sec.

H= R ated head in m



3.SPEED R ISE:

Depends upon guide vanes/Deflector closing

time.

4.PR ESSUR E R ISE:

Depends upon guide vane/ needle closing

time and length of water conductor fromsurge tank to tailrace.



ELEMENTS OF GOVERNING

EQUIPMENT

SPEED SENSING DEVICE

EHGHMC

SER

VOMOT

OR



GOVERNOR

CHARACTERISTICS

TEMPOR ARY SPEED DR OOP

PER MANENT SPEED DR OOP



22



COMPONENT OF GENERATOR

STATOR

ROTOR

UPPER BRACKET

LOWER BRACKET

THR UST BEARING & GUIDE

BEARINGS

SLIP RING & BR USH ASSEMBLY AIR COOLERS

BRAKES & JACKS

STATOR HEATERS



ROTOR(DIAGRAM)



STATOR SEGMENT(DIAGRAM)



AUXILIARIES COMPONENT

GOVERNING SYSTEM

H.P. OIL INJECTION PUMPS

OIL LEAKAGE UNIT

COOLING WATER SYSTEM

EXCITATION SYSTEM

BRAKE DUST EXTRACTION

UNIT

CONT.



AUXILIARIES COMPONENT

STATOR HEATERS CONTROL

UNIT CONTROL & PROTECTION

PANELS BRAKE & JACK CONTROL UNIT

D.T.T. PANEL

R.T.D.S.

UAB

UAT

CONT.



-GENERATOR BUS DUCT & CT, LAVTS

-GENERATOR STEP UP TRANSFORMER

-SWITCHYARD/GIS & POTHEAD YARD



- CENTRALISED CONTROL

- PROTECTION PANELS

- PLCC



STATION AUX

ILIARIES

H.P. COMPRESSED AIR SYSTEM

L.P.COMPRESSED AIR SYSTEM

CONT.



STATION AUX

ILIARIES

DRAINAGE PUMPS

DEWATERING PUMPS

CONT.



STATION AUXILIARIES

VENTILATION SYSTEM

AIR CONDITIONING SYSTEM

FIRE FIGHTING SYSTEM

CONT



STATION AUXILIARIES

STATION A.C. POWER SUPPLY -

SST, H.T. BREAKERS, D.G. SETS

D.C. POWER SUPPLY, 220V, 48V, 24V

BATTERIES, CHARGERS & D.C.D.B.



STATION AUXILIARIES

E.O.T. CRANE

LIFT



THANK YOU

component of power house

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