113527696-EM-I-manual

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ELECTRICAL MACHINES LAB-1List of experiments

1. Magnetization characteristics of DC shunt generator.

Determination of critical field response.

2. Brake test on DC shunt motor. Determination of performance

curves.

3. Load test on DC series generator. Determination of characteristics.

4. Load test on DC compound generator. Determination ofcharacteristics.

. !"in#urn$s test and speed control of DC shunt motor. %re&

determination of efficienc'.

(. Load test on DC shunt generator. Determination of characteristics.

). *opkinson$s test on DC shunt machines.

+. Brake test on DC compound motor. Determination of performance

curves

,. -etardation test on DC shunt motor. Determination of losses at

rated speed.

1. !eparation of losses in DC shunt motor.

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ELECTRICAL MACHINES LAB-1

EXP-1. MAGNETIZATIN CHARACTERISTICS !

"C SH#NT GENERATR

AIM/ 0o dra" the magnetization characteristics or open circuit characteristics of a selfecited DC shunt generator and to determine Critical resistance critical speed.

NAME PLATE "ETAILS$

1. voltage /

2. current /3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$

!.67 6ame of thee8uipment

-ange 0'pe 9uantit'

CIRC#IT "IAGRAM/

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THER&$

PRECA#TINS$

1. 5ear the hand gloves.2. :void loose connections and hanging "ires.

3. Make sure the initial value of field resistance is minimum.

4. Don$t start the motor 76 load.

PRCE"#RE$

1. make the connection as per the circuit diagram2. ;nsure minimum resistance ar' the field current in the steps using the field rheostat.

i= ?ncreasing mode/ increase the field current in steps and not do"n thevalues of @ield current

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SAMPLE CALC#LATINS$

EXPECTE" GRAPH$

@ield current

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EXP. (. BRA)E TEST N "C SH#NT MTR.

AIM $0o stud' the performance of DC shunt motor #' conducting Brake test.

NAME PLATE "ETAILS/1. voltage /

2. current /

3. *.%5 rating/4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$

1. 5ear the hand gloves.

2. :void loose connections and hanging "ires.

3. Make sure the initial value of field resistance is minimum.4. Don$t start the motor 76 load.

. -elease the load on the motor #efore s"itch 7@@ the suppl'

PRCE"#RE$

1. Make the connection as per the circuit diagram

2. ;nsure minimum resistance

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SAMPLE CALC#LATINS$

GRAPHS$

1. ;fficienc' >s output.2. !peed >s output

3. 0or8ue >s output

4. Load current >s output. speed >s output

RES#LTS AN" CNCL#SIN$

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EXP-*. LA" TEST N "C SERIES GENERATR.

AIM $0o perform the load test on DC series generator and to dra" the internal andeternal characteristics.

NAME PLATE "ETAILS$

1. voltage /2. current /

3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$



4. Don$t start the machine 76 load.

PRCE"#RE$

1. Make the connection as per the circuit diagram.2. 0he motor generator set is started and #rought to rated speed m' var'ing themotor field rheostat.

3. 5hen it is running at rated speed the generated field is adusted to get rated

voltage on no load.4. 0he generator field rheostat is not distur#ed through out the eperiment.

. Load is put in steps on the generator the speed is adusted to rated value for each

load and the load current ?L and terminal voltage > are noted.(. 0he step is repeated till the generator is over loaded #' a#out 2H.

BSER'ATINS $

!.6o Load current

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GRAPHS$

1. ?nternal characteristics/ ;g>s ?L2. ;ternal characteristics/ >0>s ?L


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EXP-+. LA" TEST N "C CMP#N" GENERATR.

AIM $ $0o perform the load test on DC compound generator and dra" the internal andeternal characteristics.

NAME PLATE "ETAILS$


3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$


2. :void loose connections and hanging "ires.3. Make sure the initial value of field resistance is minimum.


PRCE"#RE$

1. Make the connection as per the circuit diagram.

2. 0he motor generator set is started and #rought to rated speed m' var'ing the

motor field rheostat.3. 5hen it is running at rated speed the generated field is adusted to get rated

voltage on no load.

4. 0he generator field rheostat is not distur#ed through out the eperiment.. Load is put in steps on the generator the speed is adusted to rated value for each

load and the load current ?L shunt @ield current ?sh and terminal voltage > are

noted.

(. 0he step is repeated till the generator is over loaded #' a#out 2H.

BSER'ATINS $

!.6o 0erminal

voltage 0=

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GRAPHS$

1. ?nternal characteristics/ ;g>s ?L2. ;ternal characteristics/ >0>s ?L

RES#LTS AN" CNCL#SIN

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EXP-,A. S/INB#RN0S TEST N "C SH#NT MTR

AIM $0o perform the !"in#urn$s test on given DC shunt machine and predetermine itsefficienc' at an' desired load #oth as motor and as generator.

NAME PLATE "ETAILS$

1. voltage /

2. current /

3. *.%5 rating/4. speed /

APPARAT#S RE%#IRE"$

!.67 6ame of the

e8uipment

-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$




PRCE"#RE$

1. make the connection as per the circuit diagram2. ;nsure minimum resistance

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Rnnin2 3s 3 2ener3tor$

:rmature current -a

-ated current ?r

:rmature current for motor ?ao ?I?fConstant losses

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EXP-,B. SPEE" CNTRL ! A "C SH#NT MTRAIM / 0o control the speed of the DC shunt motor #' var'ing field current an armature

voltage.

NAME PLATE "ETAILS$

. voltage /

(. current /). *.%5 rating/

+. speed /

APPARAT#S RE%#IRE"$

!.67 6ame of the

e8uipment

-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$




.

PRCE"#RE$


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EXP-9. LA" TEST N "C SH#NT GENERATR

AIM $0o perform the load test on DC compound generator and dra" the internal and

eternal characteristics

NAME PLATE "ETAILS$

1. voltage /

2. current /3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

THER&$

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PRECA#TINS$




PRCE"#RE$

1. Make the connection as per the circuit diagram.

2. 0he motor generator set is started and #rought to rated speed m' var'ing the

motor field rheostat.3. 5hen it is running at rated speed the generated field is adusted to get ratedvoltage on no load.

4. 0he generator field rheostat is not distur#ed through out the eperiment.

. Load is put in steps on the generator the speed is adusted to rated value for eachload and the load current ?L shunt @ield current ?sh and terminal voltage > are

noted.

(. 0he step is repeated till the generator is over loaded #' a#out 2H.

BSER'ATINS $

!.6o 0erminal

voltage 0=

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GRAPHS$

1. ?nternal characteristics/ ;g>s ?L

2. ;ternal characteristics/ >0>s ?L


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EXP-:$ HP)INSN0S TEST R REGENERATI'E0S

TEST BAC) T BAC) TEST

AIM $0o perform *opkinson$s test on DC shunt machines.

NAME PLATE "ETAILS$


3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

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THER&$

PRECA#TINS$




PRCE"#RE/

1. make the connection as per the circuit diagram


+. -epeat the procedure for different generator armature currents.

BSER'ATINS$!6o >oltage

Tot34 4osses$

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:rmature copper losses in motor ?22-a"atts

!hunt copper losses in motor> ?3"atts

:rmature copper losses in generator ?42-a"atts

!hunt copper losses in generator > ? "attsMotor dra"n suppl' from the suppl' > ?1 "atts

0otal stra' losses > ?1&?22

-a I?42

-a "atts.!tra' losses for each machine 52 "atts.

Motor inpt$

:rmature input I !hunt field input

> ?2 I> ?3.Motor 4osses$ :rmature copper losses I!hunt copper losses I!tra' losses

?22-aI> ?3I52

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EXP-=. BRA)E TEST N "C CMP#N" MTR.

AIM/ 0o stud' the performance of DC compound motor #' conducting Brake test.

NAME PLATE "ETAILS$


3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$


-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

THER&$

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PRECA#TINS$



4. Don$t start the motor 76 load.. -elease the load on the motor #efore s"itch 7@@ the suppl'

PRCE"#RE$

1. make the connection as per the circuit diagram


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GRAPHS$

1. ;fficienc' >s output.2. !peed >s output

3. 0or8ue >s output

4. Load current >s output. speed >s output



EXP ->. RETAR"ATIN TEST

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AIM/ 0o conduct a -etardation test on DC shunt motor and to determine dndt and

determination of losses at rated speed.

NAME PLATE "ETAILS$

1. voltage /2. current /3. *.%5 rating/

4. speed /

APPARAT#S RE%#IRE"$

!.67 6ame of the

e8uipment

-ange 0'pe 9uantit'

CIRC#IT "IAGRAM$

THER&$

PRECA#TINS$



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PRCE"#RE$

. make the connection as per the circuit diagram

(. ;nsure minimum resistance

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THER&$

RECA#TINS$




PRCE"#RE$


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GRAPHS$

%lot 5s6 vs field ecitation

@rom graph

7%:IC

%9tan N1slope of line %9%9 BID

?f motor runs at different ecitation then

7- :IC1

-!tan N2 slope of line -!-!BID1

C&C17%&7-D&D1tan N1&tan N2

?f B1 ma and B2ma are flu densities of t"o different ecitations then

(.1

2

1

(.1

2

1

1 ma

ma

=

=

EB

EB

B

B

C

C

5here ;B1 and ;B2 are #ack emf developed in motor at t"o different ecitations then

2

2

1

2

2

1

1 ma

ma

=

=

EB

EB

B

B

D

D

C&C17%&7-

D&D1tan N1&tan N2

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:B

C

D*'sterisis losses :6

;dd' current lossesB6

2

@riction losses C6

5indage losses D62!tra' losses

113527696-EM-I-manual

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