Lesson Plan Em II

LESSON LESSON PLAN Sub: ELECTRICAL MACHINES-II Staf name: k.srinivasuu

s.n ! 1

II B.TECH IISEM

T!"i# UNIT – I

T!ta n! !$ #asses

SINGLE SINGLE PHASE PHASE TRANSF TRANSFORM ORMERS ERS – 

01

CONSTRUCTION & OPERATION:

2 3 4 5 6

7 8 9 10 11 12 13

14 15 16 17 18

19

20 21 22 23

24

25 26

Single phase transformers-types – constructional details-minimization of hystersis and eddy current losses-emf equation –  oper operat atio ion n on no load oad and and on load load - phas phasor  or  diag diagra ram ms - Equi Equiva vale lent nt cir circui cuit - losse ossess and and efficiency-regulationAll day day effi effici cien ency cy - effe effect ct of vari variat atio ions ns of  frequency & supply voltage on iron losses.

UNIT

–

II

TEST TESTIN ING G

OF

SING SINGLE LE

PHAS PHASE E

TRANSFORMER AND AUTOTRANSFORMER:

OC and SC tests - Sumpners test  predetermination of efficiency and regulationseparation of losses test parallel operation !ith equal and unequal voltage ratios – auto transformers-equivalent circuit – comparison !ith t!o !inding transformers.

UNIT

-

III

POLYPH POLYPHASE ASE

POLYP POLYPHAS HASE E

03 02 03

02 02 03 03

TRANSFORMERS: TRANSFORMERS:

"olyphase transformers - "olyphase connections  #$#% #$∆% ∆$#% ∆$∆ and open ∆% hird harmonics in phase voltagesthree !inding transformers-tertiary !indingsdete determ rmin inat atio ion n of 'p% 'p% 's and and 't tran transi sien ents ts in s!itching –  off off load oad and and on load load tap tap chan changi ging ng(( Scot Scottt connection.

UNIT–IV

01 02

INDUCTIO INDUCTION N

03 03 02 01

MOTORS MOTORS::

"olyphase induction motors-construction details of  cage and !ound rotor machines production of a rotating magnetic field - principle of operation rotor emf and rotor frequency - rotor reactance% roto rotorr curr curren entt and and pf at stan stands dsti till ll and and duri during ng operation)ot )otor po!e po!err inpu inputt% rot rotor copp copper er loss oss and and mecha echani nica call po!e po!err deve develo lope ped d and and thei theirr inte inter  r  relationtorque equation-deduction from torque equation – e*pr e*pres essi sions ons for for ma*i ma*imu mum m torq torque ue and and star starti ting ng torque –   torque slip characteristic

02 02 02

04

03

02

27 28

UNIT – V

CHARACTERISTICS OF INDUCTION

+ou,le cage and deep ,ar rotors equivalent circuit –  phasor diagram - cra!ling and cogging. Circle Circle diagram diagram-no -no load load and ,loce ,loced d rotor rotor teststests-

02

MOTORS:

29 30 31

02 04

Remarks

LESSON PLAN II B.TECH IISEM Sub: ELECTRICAL MACHINES-II Staf name: k.srinivasuu 32  predetermination of performance-methods of  starting and starting current and torque calculations 33 34 UNIT – VI

35 36 37

SPEED CONTROL METHODS:

Speed control-change of frequency( change of   poles and methods of consequent poles( cascade connectioninection of an emf into rotor circuit /qualitative treatment only0-induction generator-principle of  operation.

Signature of sta Signature of HOD

02

02 03 03 02