enercon-4[1].docx

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Objective:

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To verify the cho verify the characteristics of Long Shunt Comparacteristics of Long Shunt Compound DC Generatoround DC Generator..

Materias:

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Discussion:

The principe of Long shunt com

The principe of Long shunt compound DC generator +erpound DC generator +ere amost the same ine amost the same in Short Compound DC Generator that if

Short Compound DC Generator that if an armature rean armature revoves bet+een t+ovoves bet+een t+o stationary poes, the current in the

stationary poes, the current in the armaturarmature moves in e moves in one direction duringone direction during haf. To produce a steady -o+ of unidirectiona or direct current such a haf. To produce a steady -o+ of unidirectiona or direct current such a device. t is necessary to provide a means of

device. t is necessary to provide a means of reverreversing the current -o+sing the current -o+ outside the generator once during each revoution.

outside the generator once during each revoution.

Circuit Diagram:

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Data and /esut:

L

LOA

OA

D

V

V _NL_NL V V _FL_FL I I _RSH_RSH I I _L_L I I _RSE_RSE I I _A_A

N

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Computation:

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New Era University

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ENERGY CONVERSION LABORATORY

EXPERIMENT #4

LONG SHUNT COMPOUND DC GENERATOR

Dela Cruz, Ella Mae S.

M 10-1PM M 10-1PM

4ECE-A 4ECE-A

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ENGR. TIMOTEO LIMSIACO ENGR. TIMOTEO LIMSIACO

INSTRUCTOR INSTRUCTOR Observation Observation Con!"sion Con!"sion

Compound Wound Generator

In a

In a Compound Compound Wound Generator,Wound Generator, there are two sets of the field winding there are two sets of the field winding on each pole. One on each pole. One ofof them is connected in series having few

them is connected in series having few turns of thick wire, and the other is conturns of thick wire, and the other is connected in parallelnected in parallel having many turns of fine wire with the

having many turns of fine wire with the armature windings. It is connected in two ways. One armature windings. It is connected in two ways. One is ais a long shunt compound generator, and another is a

long shunt compound generator, and another is a short shunt compound generator.short shunt compound generator. The following two generators are discussed below.

The following two generators are discussed below.

Contents



 !ong "hunt Compound Generator !ong "hunt Compound Generator



 "hort "hunt Compound Generator "hort "hunt Compound Generator

!ong "hunt Compound Wound Generator

In a

In a long shunt wound generator,long shunt wound generator, the shunt field winding is parallel with both armature and the shunt field winding is parallel with both armature and

series field winding. The connection diagram of long shunt wound generator is shown below.

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Long Shun

Long Shunt Compound t Compound WoWound Generatund Generator or

"hunt field current is given as

"eries field current is given as

Te

Terminal voltage is given rminal voltage is given asas

If the brush contact drop is included, the terminal voltage e#uation is written as

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"hort "hunt Compound Wound Generator

In

In a Short Shunt Compound Wound a Short Shunt Compound Wound Generator, the shunt field winding is connected in parallel Generator, the shunt field winding is connected in parallel

with the armature winding only. The connection diagram of short shunt wound generator is

shown below.

Short Shunt Compound Wound Generator

"eries field current is given as

"hunt field current is given as

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Te

Terminal voltage is given rminal voltage is given asas

If the brush contact drop is included, the terminal voltage e#uation is written as

In this type of $C generator, the field is produced by the

In this type of $C generator, the field is produced by the shunt as well as series winding. Theshunt as well as series winding. The

shunt field is stronger than the series field. If the magnetic flu% produced

shunt field is stronger than the series field. If the magnetic flu% produced by the series windingby the series winding

assists the flu% produced by the shunt field winding, the generator is said to be

assists the flu% produced by the shunt field winding, the generator is said to be CumulativelyCumulatively

Compound

Compound WoWoundund generator. generator.

If the series field flu% opposes the shunt field flu%, the ge

If the series field flu% opposes the shunt field flu%, the generator is said to benerator is said to beDifferentiallyDifferentially

Compounded. Compounded. R Reeaad d mmoorree:: http://circuitglobe.com/compound-wound- http://circuitglobe.com/compound-wound-generator.html#ixzz4LvOQ!"g generator.html#ixzz4LvOQ!"g

Characteristic of DC Compound )ound Generators Characteristic of DC Compound )ound Generators

n

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and shunt@. This

and shunt@. This type of generatorstype of generators can be used as either ong shunt or short shunt can be used as either ong shunt or short shunt compound +ound generators as sho+n in the diagram beo+. n both the cases the compound +ound generators as sho+n in the diagram beo+. n both the cases the e(terna characteristic of the generator +i be neary same. The compound +ound e(terna characteristic of the generator +i be neary same. The compound +ound generators may be

generators may be cumuativey compounded or diAerentiay compoundedcumuativey compounded or diAerentiay compounded ?discuss

?discussed earier in ed earier in thethe type of generatorstype of generators@. DiAerentiay compound +ound@. DiAerentiay compound +ound generators are very rarey used. So, here +e mainy concentrate upon the generators are very rarey used. So, here +e mainy concentrate upon the characteris

characteristic tic ofof cumulatively compound wound generatorscumulatively compound wound generators..

)e a Bno+ that, in

)e a Bno+ that, in series +ound DC generatorsseries +ound DC generators, the output, the output votagevotage is directy is directy proportiona +ith oad current and in

proportiona +ith oad current and in shunt +ound DC generatorsshunt +ound DC generators, output, outputvotagevotage is is inversey proportiona +ith oad current. The

inversey proportiona +ith oad current. The eectric currenteectric current in the shunt >ed in the shunt >ed +inding produces a -u( +hich causes a fa in termina

+inding produces a -u( +hich causes a fa in termina votagevotage due to armature due to armature reaction and ohmic drop in the circuit. &ut the

reaction and ohmic drop in the circuit. &ut the eectric currenteectric current in the series >ed aso in the series >ed aso produces a -u( +hich opposes the shunt >ed -u( and compensate the drop in the produces a -u( +hich opposes the shunt >ed -u( and compensate the drop in the termina

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The combinati

The combination of a series on of a series generator angenerator and a shunt ged a shunt generator gives tnerator gives thehe characteristic of a cumuative compound +ound generator.

characteristic of a cumuative compound +ound generator. $t no oad condition there is no

$t no oad condition there is no eectric currenteectric current in the series >ed because in the series >ed because thethe oad terminas are open circuite

oad terminas are open circuited. &ut the sd. &ut the shunt >edhunt >ed eectric currenteectric current heps to heps to produce >ed -u( and e(cite the machine. )hen the

produce >ed -u( and e(cite the machine. )hen the dc generatordc generator suppies suppies oad, the oad current increases and

oad, the oad current increases and eectric currenteectric current -o+s through the series -o+s through the series >ed. Therefor

>ed. Therefore, series >ed aso provides some >ed -u( and e, series >ed aso provides some >ed -u( and emf is asoemf is aso increased. The

increased. The votagevotage drop in the shunt drop in the shunt machine is thereformachine is therefore compensatede compensated by the

by the votagevotagerise in the series machine.rise in the series machine. '(terna

'(terna characteristicharacteristic of c of DC compound wound generatorDC compound wound generator is dra+n is dra+n bet+een the termina

bet+een the termina votagevotage and the oad and the oad currcurrent.&y adjusting the no. ofent.&y adjusting the no. of amp"turns in the series >ed +inding +e can

amp"turns in the series >ed +inding +e can get foo+ing e(ternaget foo+ing e(terna characteristics:

characteristics:

!. f the series turns are so

!. f the series turns are so adjusted that +ith the increase in oad adjusted that +ith the increase in oad currcurrent theent the termina

termina votagevotage aso increases, then the generator is caed over aso increases, then the generator is caed over compounded. The curve $& in the

compounded. The curve $& in the >gure sho+ing this characteristic. )hen>gure sho+ing this characteristic. )hen the oad current increase

the oad current increases then the -u( s then the -u( provides by the series >ed asoprovides by the series >ed aso increases. t gives the additiona generated votage. f the increase in increases. t gives the additiona generated votage. f the increase in generated

generated votagevotage is greater than the is greater than the votagevotage drops due to armature reaction drops due to armature reaction and ohmic drop then, termina

and ohmic drop then, termina votagevotage of the generator is of the generator is increased.increased. *. f the series turns are so

*. f the series turns are so adjusted that +ith the increase in oad adjusted that +ith the increase in oad currcurrent theent the termina

termina votagevotage remains constant, then the generator is caed -at remains constant, then the generator is caed -at compounded. The curve $C in the >gure sho+ing this

compounded. The curve $C in the >gure sho+ing this characteristic. )hencharacteristic. )hen the oad current increase

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increases and gives the additiona generated votage. f the

increases and gives the additiona generated votage. f the increase inincrease in generated

generated votagevotage is eua to the is eua to the votagevotage drops due drops due to armature reaction andto armature reaction and ohmic drop then, rated

ohmic drop then, rated terminatermina votagevotage of the generator remains same as of the generator remains same as nono oad votage.

oad votage.

2. f the series >ed +inding has esser no. of turns then the rated 2. f the series >ed +inding has esser no. of turns then the rated termina

termina votagevotage becomes ess than the no oad votage, then the generator becomes ess than the no oad votage, then the generator is caed under compounded. &ecause, the increase in generated

is caed under compounded. &ecause, the increase in generated votagevotage is is esser than the

esser than the votagevotage drops due drops due to armature reaction and ohmic drop.to armature reaction and ohmic drop. Curve $D in the >gure is sho+ing

Curve $D in the >gure is sho+ing this characteristic.this characteristic.

Characteristics of DC Compound Generator

9or sma distance operation the

9or sma distance operation the -at compounded generators are generay-at compounded generators are generay used because the ength of the feeder is negigibe. &ut to maintain

used because the ength of the feeder is negigibe. &ut to maintain constant

constant votagevotage over a ong over a ong period, the over compounded generators areperiod, the over compounded generators are used. t +orBs as