Idamalayar Hydro Electric Project

 Draft tube with Circular Inlet & Rectangular Outlet. Increase in

net head by establishing a negative head at theturbine outlet  Converts a large proportion of ke rejected at the outlet into pressure energy  Without a draft tube, the pressure at the outlet of the turbine will be equal to the atm pressure.  Draft tube increases efficiency

 Excitor

 DC System    

at Idamalayar Power Station A 220V dc system for the Units & 110kV Feeders A 110V dc system for the 66kV IMKM feeder A 48V dc system for the PLCC systems A 24V dc system for the 11kV OD CBs

Unit Auxiliary Transformers The      

name plate details

of

Maker: National Electrical - 630kVA, 11000/433V, 53.1/840A

the

UATs

Industries

- 3Ø

- S/N: RY2692/1(UAT 2), RY2692/3(Standby)

1),

RY2692/2(UAT

 - Type

of

Cooling:

SN,

Frequency:

  - Impedance:

4.86%, Vector Group:DYn11

  - Tap

Changing:

Off

Load

Core and

Winding:

of

596kg, Total Weight:

  - Weight:

1270kg

  - Weight

Oil:

  2578kg,

Year: 1980, Tmax: 45°C

50Hz



Unit

Auxiliary

Transformers

The

name

plate

details

- Maker:

National

Electrical

Industries

- 630kVA,

11000/433V,

53.1/840A

 

of

the

     

- 3Ø

 

- S/N:

RY2692/1(UAT

1),

RY2692/2(UAT

2), RY2692/3(Standby)



- Type

of

Cooling:

SN,

Frequency:

50Hz

- Impedance:

4.86%,

Vector

Group:

DYn11

- Tap

Changing:

Off

Load

- Weight:

Core

and

Winding:

1270kg

- Weight

of

Oil:

596kg,

Total

2578kg,

Year:

1980,

Tmax:

45°C

      

  

Weight:

UATs

 LA-SC Cubicle

 -Station Arrestor & Surge Capacitor

 Generator Breakers

 - Closing Time  - Opening Time  - Dead Time

 Generator Breakers

 - Closing Time  - Opening Time  - Dead Time

 Generator Breakers

 - Closing Time  - Opening Time  - Dead Time

 Generator CTs

 - Duct CTs  - No of Cores and Spec.

 Generator PTs

 Generator PTs

 IMMA Line PTs

 IMMA Line CTs

 IMMA Line Breakers

 IMMA Line Breakers

 Lighting Arrestors for GTs

  

  - LA Gradings  - Insulation Coordination of Equipments at a

power station - Necessity

 Lighting Arrestors for GTs

  

  - LA Gradings  - Insulation Coordination of Equipments at a

power station - Necessity

•

Lightning Arrestors for IMMA

 Generator Isolators

  

  - Isolators in General  - Current Carrying Capacity

 Generator Isolators

  

  - Isolators in General  - Current Carrying Capacity

 •

Line Isolators  Bus Coupler Isolator  

   - No CB here

 for Coupling/ Decoupling operations  - This results in generation loss that could ve been

avoided.  Bus Coupler Isolator

 110/66kV Transformer

 110/66kV Transformer

 110/66kV Transformer

 Breakers for HT Side of 110kV Side



 Breakers for LT Side of 66kV Side



•



Bus PTs for 66kV Bus

•



Bus PTs for 11kV Bus

 Incomer 1 Transformer 66/11kV

 Incomer 2 Transformer 66/11kV

 Open fuses on the HT side of the Incomers

 Dam/Colony and Chakkimedu 11kV Feeders

 Dam/Colony and Chakkimedu 11kV Feeders

 EOT Crane in Service Bay

  

  Earth 

Mat in

the

Yard

 EOT Crane in Main Store

 EOT Crane in Valve House



Protections:

 

-

Of

the

Machine

-

Of

the

Feeders

-

Of

the

Transformers

-

Start/Stop

Sequence

-

Relays

for

Fire

Protection

Systems

-

CO2

-

       

the

Start/Stop

sequencing

Flooding

System

for

Generator

Stator

Water

Deluge

system

for

the

GTs

-

CO2

portable

cylinders

-

AFFF

portable

cylinders

-

DCP

portable

cylinders

 

-

             

Cooling

Systems

in

place:

-

Oil TGB

Heat

Exchangers

at

UGB,

LGB,

TB

-

Surface

Air

Coolers

for

the

Generator

Stator



-

Uses the reservoir which pumping

Penstock is results method.

bleeding large in

than the and the an affordable loss

pumping head compared

method is to



Lubrication: units Servomotors, Guide vane Pump:

serves bushings

lubrication etc.

needs

of

the

Works

with from

the the

Ventury

principle,

clears

the

water

TGB's

shaft

seal

side

Shaft

Sealing:

Why

not

Pelton

for

medium

and

high

heads?

  

and

  

since small, the

 

CGLU



Ejector

 

     

leakage

Filtering

Units

pumps

-

redundancy

HP/LP

Air

Compressor

Systems

-

Redundancy



Drainage

Pit Leakage

Water

Pump Leakage

Oil

Pump



Leakage

Oil

Collector

under

bearings

Pumps

for

removing

the

leakage

Measurement

/

Instrumentation

System:

-

Condition

Monitoring

-

RTDs/TSDs

for

temp

-

Rotor

temp

measurement

-

Permit

to

Work

on

-

AVR

-

Thyristor

Panels

-

Redundancy

-

Regulation

Cubicle



Oil

 

OPUs

 

OPU

 

AOT

  

 

oil

from

these

     

measurement

   

-

        

Machines/Feeders/Other

Equipments

collectors



CBs Operation SF6



Air

Blast

 

Vacuum

 

Air

 

Spirng/Air

for

Close

/

Open

Thrust

bearing Beaing

pads

Russian

design

-

Pin

type

(Kingsbury

Pins)

Semi

Umbrella

advantage

-

Minimization

of

Iron

cost

Mattress

type

pads

HPOP

system

Jacking

Up

of

Rotor

-

Necessity

-

Min

Continous

Operating

Speed

 

Thrust

             

Braking

 

Brake

Pads up

while stopping

position

below

rotor,

lifts

the

rotor



Saves

the increased friction

babbitting during

from the

getting slow

damaged speeds

due

to

the

 Power

Transformer & Transformer

Distribution

  Tests Meggering PI  IR PD  CT Secondary

for

a

Open situation while

  Capacitor Banks -

Functions

  Turbine

Mode/Condenser mode

-

no

issue

 Startup

 Normal  Spin Generator  Generator

 Spinning Reserve?



Shutdown

Modes:



Controlled Action

Shutdown

-

Initiated turbine

under

non

urgent

mechanical/electrical

faults

of

&

generator



-

Once initiated vanes/jets

this which results to

signal in the

is the no

received, closing load

governer of values

stop the

is guide



-

GCB control) If trip failed.

is Guide in Goes

opened vanes preset to Emergency

(Nothing is dont close/GCB time, Controlled Action SHutdown

mentioned and Shutdown

abt FB is

Excitation dont considered



-

Initiated

when

the

controlled

action

shutdown

fails



-

Initiated

usually

under

electrical

&

mechanical

faults



-

Operates simultaneously

the

Emergency

Closing

Valve

&

GCB

-

Guidevanes/Jets

are

closed

very

fast

-

FB opened.

tripping

is

done

once

the

GCB

is

-

If trip

Guide in

vanes preset

dont close/GCB time, Catastrophic Shutdown

and is

FB initiated

dont



    



listed happen

     

 Catastrophic

Shutdown

 -

Initiated when a condition arises

catastrophic

 -

Or Controlled Action/Emergency SHutdown program fails

 -



Commands given to simulataneously close MIV, to Open Emergency