Transformer Test

8/17/2019 Transformer Test

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Contents…………………………………………………..•

Transformer TC-2 details• Tests in TC-2 RLA report• HT motor C- !"# name plate• $nstr%ment Transformers•

Batteries


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TC-2 Name platedetails………………………………•

Capacity-#! &'A Phases-"• 'olta(e Ratin(-##)*.+ ,'• C%rrent Ratin(- 2 ) " A• 'ector (ro%p - /0n##• 1$mpedance on center tap- ."!• Taps- center tap-: - for ##,'• Coolin(-3NAN• 3il-"*!! liters• Total mass-# !! ,(• &a4. temp. rise in oil and 5indin( o6er am7i. Temp. 8 !) de(ree celci%s


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Tests in RLAreport…………………………………•

&a(netic Balance Test• 'ector 9ro%p Test• indin( Resistance Test• /issol6ed 9as Analysis;%ran Analysis• ?>RA test• $R and P$


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'ector 9ro%p Test•

Testin( proced%re for /yn## 6ector (ro%p• Connect ne%tral point of star 5indin( 5ith earth.• @oin # of H' and 2 of L' to(ether.• Apply # ' three phase s%pply to H' terminals.• &eas%re 6olta(es 7et5een terminals

#. #'2 8#'2'2. # 2' # 2". # #'8#'2ND# 2N


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hat if 6ector (ro%p is /yn# F

• Testin( proced%re and connections 5ill remain same.• &eas%re 'olta(e on secondary

#= # 2 8 # 2'2= #'2 #'2'"= # # 8


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indin( Resistance Test•

&ethods for R test• '-$ method• ,el6inGs 7rid(e method

• Test e %ipment-Presti(e micro-ohm meter # R


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>%ran Analysis I/P………………………..• >%ran is hetero cyclic compo%nds ha6in( car7on and one o4y(en atom• /p8/e(ree of polymeriJation

• 9i6es meas%re of len(th of cell%lose• Paper ins%lation de(rades d%e to hi(h temp. moist%re and o4y(en.• /e(radation 7y-prod%cts are:

• ater and Car7on o4ides• >%rans

• -hydro4y-methyl-2-f%rf%raldehyde• 2-f%rf%ral• 2-Acetyl f%ran• -methyl-2-f%raldehyde• 2-f%rf%ryl alcohol


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?>RA Test………………………………………………• $t is fre %ency response of indi6id%al 5indin(.• L' sin%soidal 5a6e of 6aria7le fre %ency inKected at

5indin( to 7e tested and meas%re si(nal atten%ation indB.

• >re .ran(e-#! HJ to 2 &HJ• dB82! lo(


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&ethods :-•

Time-7ased comparison 5ithpre6io%s res%lts of the same %nit.• Type-7ased comparison 5ith

pre6io%s res%lts of the sistertransformer.

• Phase comparison comparison5ith pre6io%s res%lts of the otherphases of the same transformer.

Transformer as R-L-C

net5orM


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H' open circ%it plot


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L' open circ%it plot


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C- !"#motor………………………………………..•

Po5er- , 'olta(e-*.* ,'• >LA-+" A >%se-#*!A• Rpm-#• &o%ntin(-B"• >rame-N C•

Heat Loss- ! ,• Coolin( ater >lo5-2 (pm• orMin( Pres%%re-" Bar• ater $nlet Temp.-" OC• Recooled Air Temp.- * OC


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• Temp. class-T"• $ns%lation class->• ei(ht- *!! M(• Protection-$P• Am7. Temp.- !OC• /%ty-?#• t -#2 seconds• ciency-+ 1• Bearin(s:-

• / - >NLB ##-##!• 3/ - >NLQ ##-##!

$


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$nstr%ment Transformer……………………………

These instr%ment transformers are of t5o types:-#. C%rrent transformers2. Potential transformers


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C%rrent Transformers………………………………….?tandards speci cation-• CT as per $? s2 ! )#++2

• $ C *!! -#

Applications of CTs• &eas%rin( CT• Protecti6e CT• /%al p%rpose CT

Name Plate Details of MOCB CT

Ratio #!!!)#)# A3%tp%t 'A forcore # I 2

#

H?' *.*,'Class for core #. #Class for core 2 #!P#!$th 2* ,A for # secCore 2&aMe Precise


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C%rrenttransformers………………………………..•

?peci cation• Primary c%rrent• ?econdary c%rrent

• A or #A• Acc%racy class•

7%rden• ins%lation 6olta(e• rror• Ratio

P i l


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Potential Transformers………………………………..

?tandards speci ed-• $? "# *)#++2.• $ C *!! -2.

?peci cations-• 'olta(e Ratio• Acc%racy Class• Rated 'A B%rden• Rated 'olta(e >actor• 7%rden• ins%lation 6olta(e

Name plate details of MOCB PT

Ratio **!!)##! ''A #2!Class #

H?' .2 ,'$ns%lation le6el 22)*!,'


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Batteries…………………………………………………..

Batteries

Primary ?econdary

AlMaline4-Ni-Cd


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Lead-Acid Battery•

Positi6e - P73 2• Ne(ati6e P7• lectrolyte H 2?3

•

Reaction :-


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Ni-Cd 7attery•

Positi6e - Ni


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Ni-Cd 7attery details-P4•

Name plate• ,PH #!!P• ,8AlMaline 7attery• P8 PocMet type plate < 3ther types are sintered foam 7er plate• H8#!!Ah capacity• P8Polypropelene container

• Nominal 6olta(e -#.2 '• Battery 7anM details

• BanM #- 7atteries #!!Ah• BanM 2- 7atteries !Ah


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• Nominal voltage of Battery : The 6olta(e from 5hich the 7attery starts dischar(in5hen loaded.

Ni-Cd 7attery 8 #.2! 'PC

Lead acid 8 2.2! 'PC• Float voltage : The 6olta(e 5hich is sli(htly hi(her than the nominal 6olta(e and 5ill

not dama(e the cell if applied contin%o%sly.

Ni-Cd 7attery 8 #. # 'PC

Lead acid 8 2."! 'PC• Boost voltage : The 6olta(e 5hich is m%ch hi(her then the Soat 6olta(e to re(ain the

7attery ori(inal capacity.

Ni-Cd 7attery 8 #. 'PC

Lead acid 8 2. 'PC• End cell voltage : The 6olta(e at 5hich 7attery dischar(in( sho%ld stop. Battery

sho%ld not 7e Mept in this state for lon(er time to a6oid permanent fail%re.

Ni cd 7attery 8 #.!! 'PC

Lead acid 8 #. 'PC


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Ad6anta(es of Ni-Cd o6er Lead-Acid•

Lon( lifetime and lon( stora(e life.• the electrolyte in nicMel-cadmi%m is less corrosi6e to7attery parts than in a lead-acid 7attery.

• NicMel-cadmi%m 7atteries ha6e lo5er o6eralle ciencies 7et5een *!1 to 1.

•

Can 7e f%lly dischar(ed 5itho%t any dama(e.• Red%ced sensiti6ity to temperat%re.• Lo5 maintenance re %irements


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/isad6anta(es of Ni-Cd o6er Lead-Acid•

T5ice 4pensi6e then Lead acid• Lo5er all o6er e ciency• &emory ect

Battery


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BatteryChar(er………………………………………..•

P%rpose• To s%pply dc po5er in emer(ency e %ipment.

• Types• >loat char(er•

>loat c%m 7oost char(er


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3peration•

Normally 7oth char(ers are in >L3AT mode and s%pplyload and tricMle char(in( c%rrent to 7attery 7anMs.• /#-/ diodes are in circ%it to red%ce 6olta(e from #2# '

to ## '.• $n case of s%pply fail%re 7atteries 5ill feed the load a

diodes 5ill 7e 7ypassed 7y contactor.• Boost mode is re %ired 5hen 7atteries are needed tochar(e fast. Char(er 5ill not feed any load in this mode.


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Battery Char(er-P4…………….……………………….•

Type 3f %nit- ##! ')# ! AH ?&P? 7attery char(er• &ains AC $)P # ' A.C• >loat 'olta(e #. ')cell• >loat c%rrent- A• Boost 'olta(e #. ')cell• Boost c%rrent * A• Am7ient Temp !UC• Ripple-#1


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arthin(……………………………………………………


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THAN, 03

Documents

Transformer Test