A Practical Training Seminar on KOTA SUPER THERMAL POWER STATION submitted to MODI INSTITUTE OF TECHNOLOGY NAYAGAON, KOTASUBMITTED BY:ANIL GAUTAM GUIDED BY:(B.TECH, VII SEMESTER) SUMAN PURI HFINAL YEARELECTRICAL BRANCH
INTRODUCTION OF KSTPS In kota super thermal powerstation electricity is generated. The project was proposed bycentral electric authorithy ofindia in April,1973.The project was revised in1975 and approved in sep.,1976At first two units are installedeach producing 110MW ofpower
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
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 induction2. 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 SQUIRREL PHASE-WOUND1. Rotor consists of a 1 Rotor consists of 3-phase cylindrical double-layer distributed laminated core with windings consisting of coils parallel slots carrying the as used in alternator rotor conductors. 2 Rotor is wound 3-phase2. Each bar is placed in each even when the stator is slot. wound 2-phase3. Rotor bars are permanently 3 Requires additional short-circuited on resistance in the rotor themselves. 4 Under normal condition,4. motor Run quietly slip- rings are5. Reduces the locking automatically short- tendency of the rotor 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
TYPES OF INDUCTION MOTOR • Rotary induction motor • Linear induction motor a. Stator is a straight track and rotor moves in track when a current to stator • Power input induction motor a. Single-phase induction motor i. not self-starting ii. Split-phase motor, capacitor motor,shaded-pole motor b. Two-phase induction motor c. three-phase induction motor i. Stator & rotor ii. Self-starting torque
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 startingExternal resistancesare connected inSeries with eachphase of statorwinding duringstarting.
Auto-transformer startingAim of this to areduced supplyat starting. Asthe motor picksup sufficientspeed.
Star-delta startingstar connection duringstarting givesStator-phase voltageis 1/sqr3 timesThe line voltage andstaring torqueis 1/3 times the deltavalue
ADVANTAGE DISADVANTAGE1 Simple and extremely 1 Constant speed motor rugged, almost 2 Starting torque is inferior unbreakable construction to d.c. shunt motor2 Low cost and very reliable 3 Speed decreases as the3 Sufficiently high efficiency load increases unlike4 No brushes are needed synchronous motor5 No need of extra starting 4 High cost of Speed motor control auxiliaries6 Minimum maintenance 5 Low starting torque7 Self 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.