Presentation2

APractical Training

Seminar onKOTA SUPER THERMAL POWER STATION

submitted toMODI INSTITUTE OF TECHNOLOGY

NAYAGAON, KOTA

SUBMITTED BY: ANIL GAUTAM(B.TECH, VII SEMESTER)FINAL YEARELECTRICAL BRANCH

GUIDED BY:SUMAN PURIH

INTRODUCTION OF KSTPS

In kota super thermal power station electricity is generated. The project was proposed by central electric authorithy of india in April,1973.The project was revised in 1975 and approved in sep.,1976At first two units are installed each producing 110MW of power

DESIGNING OF UNITS

Unit-1 110MWUnit-2 110MWUnit-3 210MWUnit-4 210MWUnit-5 210MWUnit-6 195MWUnit-7 195MW

SITE SELECTION OF POWER PLANT

• Availability of water• Nearness to load centre• Distance from populated area• Availability of coal• Transportation facility• Ash disposal

CONTENTS OF KSTPS

Coal handling plant Boiler Ash handling plant Turbine Electrostatic precipitator Switchgear Switchyard Condenser Cooling Tower Dm plant

PROCESS

ADVANTAGE OF PLANT

Fuel used is cheaper

Less space is required

Cheaper in production cost

Cheaper in initial cost compared to other generating stations

DISADVANTAGE OF THERMAL PLANT

• High maintenance and operating cost

• Requirement of large water quantity

• Handling of coal and disposal of Ash

• Pollutes the atmosphere

• Costlier in running cost

• Efficiency falls below 75% of full load

INDUCTION MOTOR

INTRODUCTION OF INDUCTION MOTOR

• An induction or asynchronous motor is a type of Ac motor where power is supplied to the rotor by means of electromagnetic induction and generate rotation rather than by slip-rings and commutators as in slip-ring Ac motors.

CONSTRUCTION OF INDUCTION MOTER

• An induction motor consists of two parts 1. stator: when supplied with a 3-phase currents,

produce a magnetic flux. which is of a constant magnitude but which revolves at a synchronous speed.This revolving magnetic flux induces an e.m.f. in the rotor by mutual induction

2. rotor:it has two types .2.1 squirrel-cage rotor: squirrel-cage induction

motors employ squirrel-cage rotor.2.2 phase-wound rotor : motors employing this type

of rotor ,such as ‘slip-ring’ motors or ‘wound’ motor

DIFFERENCE b/w SQUIRREL-CAGE ROTOR&PHASE-WOUND ROTOR

SQUIRREL1. Rotor consists of a

cylindrical laminated core with

parallel slots carrying the rotor conductors.

2. Each bar is placed in each slot.

3. Rotor bars are permanently short-circuited on themselves.

4. motor Run quietly5. Reduces the locking

tendency of the rotor

PHASE-WOUND

1 Rotor consists of 3-phase double-layer distributed

windings consisting of coils as used in alternator

2 Rotor is wound 3-phase even when the stator is wound 2-phase

3 Requires additional resistance in the rotor

4 Under normal condition, slip- rings are automatically short-circuited

PRINCIPLE OF OPERATION • Depends on electromagnetic

induction• A 3-Phase winding energized

from a 3-phase supply. A rotating magnetic field set-up around the stator at a synchronous speed

• Rotating magnetic field passes the air gap and acts the rotor conductor

• e.m.f. induced in rotor conductor and current start flowing in rotor conductor and mechanical force on rotor produces a torque

• Rotary induction motor• Linear induction motora. Stator is a straight track and rotor moves in track

when a current to stator• Power input induction motora. Single-phase induction motori. not self-startingii. Split-phase motor, capacitor motor,shaded-pole

motorb. Two-phase induction motorc. three-phase induction motori. Stator & rotorii. Self-starting torque

TYPES OF INDUCTION MOTOR

Starting method of induction motor

• Direct on line starting• Stator resistance starting• Auto transformer starting• Star-delta starting

Direct on line starting

• Motor is connected directly to 3-phase supply and starting current high 4 to 10 times the full load current.

Stator resistance starting

External resistances are connected in Series with each phase of stator winding during starting.

Auto-transformer starting

Aim of this to a reduced supply at starting. As the motor picks up sufficient speed.

Star-delta starting

star connection during starting gives

Stator-phase voltage is 1/sqr3 times

The line voltage and staring torque

is 1/3 times the delta value

ADVANTAGE

1 Simple and extremely rugged, almost unbreakable construction

2 Low cost and very reliable3 Sufficiently high efficiency4 No brushes are needed5 No need of extra starting

motor6 Minimum maintenance7 Self starting torque

DISADVANTAGE

1 Constant speed motor2 Starting torque is inferior

to d.c. shunt motor3 Speed decreases as the

load increases unlike synchronous motor

4 High cost of Speed control auxiliaries

5 Low starting torque

APPLICATION OF INDUCTION MOTOR

• Used in industry with VFD’S Technology.• VFD’S gives following points.• Speed variation.• High starting torque requirements.• Low starting current requirements.• High efficiency at low speed.• In real time application, Domestic fans &

refrigerators.

REFERENCE

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