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8/16/2019 Report on Mejia Thermal Power Plant Dvc
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at
NAME:Pravin biswakarma
JALPAIGURI GOVT. ENGG.
COLLEGE ELECTRICAL ENGG.
DEPARTMENT.
DATE OF TRAINING: From 13th June,14 to 03th
July,14
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VOCATIONAL TRAINING PROJECT REPORT ON MEJIA THERMAL
POER !TATION "M.T.P.!#$DAMODAR VALLE%
CORPORATION"D.V.C#
A&OUT M.T.P.!
Mejia Thermal Power Station is locte! t Durlo"#ur, Dist: $n%ur,&' %m (rom Dur)#ur city in *est $en)l+ ommissione! on 1--',
.T/ is the lr)est therml #oer #lnt, in terms o( electricity
)enertin) c#city in the stte o( *est $en)l s ell s mon) other
D2 #oer #lnts+
P'w(r P)ant:
.ei Therml /oer ttion hs n instlle! c#city o( &340 .*+ The
#lnt hs units un!er its o#ertion+ The in!i"i!ul units h"e the
)enertin) c#cities s (ollos:
Unit N'. G(n(ratin* Ca+a,it- C'mmissi'n( 'n
561 &10 .* 1--'
56& &10 .* 1--
563 &10 .* 1---
564 &10 .* &007
567 &70 .* &00
56' &70 .* &00-
568 700 .* &010
56 700 .* &010
5nits 1 to ' re collecti"ely nme! s MTP!/+0as(1, hile thee9tension o( 5nits 8 is clle! MTP!/+0as( 2+ All the units
http://en.wikipedia.org/wiki/Durgapur,_West_Bengalhttp://en.wikipedia.org/wiki/West_Bengalhttp://en.wikipedia.org/wiki/West_Bengalhttp://en.wikipedia.org/wiki/Durgapur,_West_Bengal
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h"e ;oilers, tur;ines n! )enertors mnu(cture! ;y $hrt
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DA.ODAR 2A==E@ OR/ORATION .ei Therml /oer ttion /+O:.T/,Dist:$n%ur8&&13,*est $en)l P0'n(:34251/242231 6A7/34251/282241
No+.TC/=C2oc+Tr)+C2ol+IIC1'&
Dte!:&-th .rch&014
TO WHOM IT MAY CONCERN
This is to certi(y tht .r+/r"in $is%rm, stu!ent o(electricl en)ineerin) o( Jl#i)uri Go"ernment En)ineerin)
olle)e, Jl#i)uri83710&>*+$? un!ertoo% "octionl trinin)
t .ei Therml /oer ttion, D2, (or the #erio! o(
&1>Tenty One? !ys +e+( 13+0'+&014 un!er Electricl De#t+,
.T/+
Durin) his trinin) he hs ;een (oun! sincere, hr!or%in) n! ell !isci#line!+
+++++++++++++++++++++++++++++++++++++++++
"!0ri &i0a-ak D9tta#
The Dyhie( En)ineer >Elect+? .T/, D2
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ACNOW!EDGEMENT
Any #roect is the (ruit(ul outcome o( the hr! or% o(
mny+ Throu)h this !ocument e oul! li%e t' (+r(ss
'9r *ratit9( t'wars t0's( w0' s9++'rt( 9s in
makin* 9s an '9t,'m( ;r'm 9s.
Firstly, e oul! li%e to thn% !0ri. &i0a-ak9tta>De#uty hie( En))+ Elec+?+ Trinin) A!"isor? ho )ui!e!
us in ech n! e"ery ste# till our com#letion o( our
trinin)+ *e re thn%(ul to them (or their continue!
)ui!nce n! su##ort ith their "st #ool o(%nole!)e, hich s essentil (or the com#letion o(
this #roect+ Alon) the y , e ere lso ;ly
su##orte! n! )ui!e! ;y sts o( the "rious
!e#rtments+ An! li%e e mentione!, the hel# is e"en
more cre!i;le, consi!erin) tht the or%lo! o( the st
s immense+
*e oul! lso li%e to thn% our (rien!s n! (mily (or
#ro"i!in) encour)ement n! morl su##ort t e"ery
ste#+ *e reco)nise e"ery;o!ys hel#in) hn!+
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CONTENTS
=
NO
TOPIC
1 INTRODUCTION AND HI!TOR%
& OVERVIE O6 A POER PLANT
3 ELECTRICAL !%!TEM
a" GENERATOR # AU$I!IRIES 1+ $AI /RINI/=E ONTR5TION &+ EITATION @TE. 3+ A2R 4+ OO=ING @TE. 7+ /ROTETION @TE. '+ GENERATOR .ETERING INT5.ENTATION
8+ E=ETRIA= /ROTETION AND AFET@
INTER=OB
%" O&ER&IEW OF GT' UT' UAT'UST' ST'
SAT'SST' NGT
(" SWITCHYARD
1+2ARIO5 O./ONENT&+/ROTETION
)" STATION GROUNDING SYSTEM
e" MOTORS
*"
*#
DC SYSTEM
DG SET
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INTRODUCTION # HISTORY
D2, le)cy to the #eo#le o( In!i, emer)e! s culmintion o(
ttem#ts m!e o"er hole century to control the il! n! errtic
Dmo!r ri"er+ The ri"er s#ns o"er n re o( &7,000 %m& co"erin) the
sttes o( $ihr >no Jhr%hn!? *est $en)l+
Dmo!r 2lley or#ortion s est;lishe! on 8th July 1-4+It is one o(
the most re#utte com#ny in the estern one o( In!i+ D2 is
est;lishe! on Dmo!r ri"er+ It lso consists o( the Dur)#ur Therml
/oer /lnt in Dur)#ur+ The hy!el #roect in .ython is one o( the most
Hourishin) #rt o( D2+ The .T/>.ei Therml /oer ttion? un!er
D2 is one o( the lr)est therml #oer #lnt in *est $en)l+ It is one
o( the (our therml #oer sttions o( D2 in the sttes o( *est $en)l+ The totl #oer #lnt cm#us re is surroun!e! ;y ;oun!ry lls
n! is ;siclly !i"i!e! into to mor #rts, rst #oer #lnt re itsel(
n! secon! is the colony re (or the resi!ence n! other (cilities (or
.T/s em#loyees+
!ALIENT 6EATURE!
=oction: .ei in $n%ur District in *est $en)l+
Instlle! #city: >&104 .*K&70& .* K 700& .*?L&340.*
ol source: $+++= n! E++=, lso im#orte! (rom In!onesi
Fuel Muntity:1&' T/(or unit 1 to 4 only?
170 T/(or unit 7 n! ' only? &8& T/< >(or unit8 only?
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(or unit 1 to '?
&8-m >(or #hse II?
*ter source: DA.ODAR RI2ER
$eneciry tte: *ET $ENGA=, J
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OVERVIE O6 POER PLANT
OPERATION
A #oer #lnt is ;siclly n ener)y con"ersion mechnism+ Therml
#oer #lnts o#erte on mo!ie! Rn%in ycle ith rehetin) n!
su#erhetin)+ In essence , it is mo!ie! (rom o( the ;sic stem cycle
to increse the cycle ePciency+ ol is ;urnt in ;oiler, hich con"erts
ter into stem+ The stem is e9#n!e! in tur;ine, hich #ro!uces
mechnicl #oer !ri"in) the lterntor cou#le! to the tur;ine+ The
or%in) o( the #oer is !i"i!e! into (our min circuits:
Fuel n! sh circuit+ Air n! Fuel )s circuit+ Fee! ter n! stem circuit+ oolin) ter circuit+
THE ENERG% CONVER!ION
hemicl ener)y to het ener)y In $oiler
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ENERG@ F=O* DIAGRA. OF DIFFERENT /ART :
.ET5R$INE?
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OVER VIE O6 A POER PLANT
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VARIOU! COMPONENT! O6 A POER PALNT:
DEAERATOR: The con!ense! ter (rom the con!enser is t%en to
!eertor here the ter is m!e (ree (rom o9y)en minly i+e+ (ree(rom ir+ The !eertor is !irect het e9chn)er ;ecuse the stem
(rom I/T is s#rye! to the con!ense! ter (rom the ;ottom n! the
ter is s#rye! (rom the to# #rt o( the !eertor+ This results in !e
o9yction i+e+ remo"l o( o9y)en (rom the ter+
&OILER 6EED PUMP! "&6Ps#: The outlet o( the !eertor is
connecte! to ;oiler (ee! #um#s, there re three $F/ in ro out o(
hich to re in runnin) con!ition n! one is t stn!;y,in unit 61 to '
ll $F/ re .D$F/,consumes hi)hest #oer in the #lnt 4+'.* in (ull
lo! n! unit68 n! one o( these is .D$F/> motor !ri"en?, n! other
to re TD$F/>stem !ri"en?+.D$F/ consumes the hi)hest #oer in
this #lnt i+e+ 10.*+ .D$F/ is use! only t the strtin) time (or its hu)e
#oer consum#tion+
HIGH PRE!!URE HEATER: The
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I/T n!
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t%es #lce in the rst #ss n! the hetin) o( stem throu)h < t%es
#lce in the secon! #ss+
!UPER HEATER: The im#ortnt #oint is to ;e lys %e#t in min! tht
ll the heters tht re use! in therml #oer #lnt re mechnicl
ty#e heters i+e+ het e9chn)e! #henomen hets one me!ium ;y
e9chn)in) het (rom nother hotter me!ium+ u#er heters re
ctully sus#en!e! #i#es in the secon! #ss section o( the ;oiler, the
Hue )s h"in) "ery hi)h tem#erture hets the stem tht comes (rom
the !rum ;e(ore they hit the tur;ines to tem#erture u# to 740Q+ The
#ressure o( stem is %e#t constnt hen #ssin) throu)h su#er heter+
The min conce#t ;ehin! m%in) the stem su#er hete! is to m%e
the stem ;solutely moisture (ree ;e(ore they hit the tur;ine ;ecuse
moisture content o( stem ill !m)e the ;l!es o( tur;ine ;y
corrosion+
TUR&INE !ECTION: The tur;ine section consists o( three #rts nme!
s Interme!ite #ressure
tur;ine?,=/T>=o #ressure tur;ine?+ The su#erhete! stem (rom the
u#erheter enters the
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o"erll unit+
6LUE GA! PATH :
AIR PREHEATER: The Hue )s #ro!uce! s result o( com;ustion o(
(ossil (uel in the (urnce is t%en to the ir #re heter+ The ir #re heter
is use! to het u# the tmos#heric ir to m%e hot ir use! (or
com;ustion n! trns#ort o( col !ust (rom mill to (urnce hich clle!
secon!ry ir+ This heter hs uniMue #rocess o( hetin), it hs
sh(t ttche! to rottin) heel ty#e structure>li%e tur;ine ;utrrn)ement ;l!es re !ierent?+ Atmos#heric ir re suc%e! ;y FD
(ns #sses throu)h one si!e o( the rottin) sh(t n! the hot Hue )s
#sses throu)h nother si!e+ This y het o( the Hue )s )ets
trns(erre! to the tmos#heric ir n! )ets hete!+ There re to ir
#re heters (or ech unit nme! s A
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5n!er )o"ernment rules n! re)ultion (or in!ustril #ollution control,
E/ is must to ech n! e"ery in!ustry hich !els hi)h sh s
resi!in)+ An electrosttic #reci#ittor is lr)e , in!ustril emission
control unit+ It is use! in in!ustries li%e therml #oer #lnt, cement,
##er, chemicls, metllur)icl in!ustries etc, hich emit #rticles+ In
the therml #oer #lnt it is !esi)ne! to tr# n! remo"e sh #rticle
(rom the e9hust )s o( ;oiler+ len )s, u# to --+-U clener thn
hen it enter is then #sses out o( the #reci#ittors+
collectin) electro!e
e%est el!
Emittin) electro!e
OR
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tor!s the chr)e! sur(ce, they in turn chr)e the #ssin) #rticle+
The electrosttic el! then !rs the #rticles to the collector sur(ce
here they re !e#osite!+ /erio!iclly, the collecte! #rticles re
remo"e! (rom the collectin) sur(ce ;y r##in) or "i;rtin) the
collector to !islo!)e the #rticles+ The !islo!)e! #rticles !ro# ;elo
the electricl tretment one n! re collecte! throu)h ho##ers (or
ultimte !is#osl+
The mor com#onents tht ccom#lishe! ;o"e cti"ities in E/ re
s (ollos:
V
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DRA6T 6AN! :
There re ;siclly three ty#es o( (ns in therml #oer
#lnt+
i+ IND5ED DRAFT >ID FAN?ii+ FORED DRAFT FAN >FA FAN?iii+ /RI.AR@ AIR FAN >/A FAN?
INDUCED DRA6T 6AN= ID 6AN:
This (n is use! to crete
ne)ti"e #ressure in the (urnce i+e+ (urnce #ressure is loer thn
tmos#heric #ressure, s result o( hich re ;lls insi!e the (urnce
cn not come out o( the (urnce+ID (ns lso !ri"es the Hue )s throu)hout its #th n! nlly eects it out o( chimney+ It suc%s ir (rom the
(urnce n! eects it to the tmos#here+ .echniclly ID (n is cou#le!
ith one 3#h synchronous ty#e motor+ It is the only synchronous motor
in the #oer #lnt ;ecuse it )i"es more ccurte control to its s#ee!
;y 2C( metho! (or mintinin) ne)ti"e #ressure s controllin) o(
ne)ti"e #ressure is the most "itl (ctor in ny therml #oer #lnt+
There re to ID (n (or ech unit+
6ORCED DRA6T 6AN:/
5nli%e ID (n, the FD (n is ment (or cretin)
#ositi"e #ressure in the (urnce n! lso su##lies ir (rom /A (n n!
secon!ry ir (or com;ustion+ The FD (n t%es ir (rom tmos#here
n! e9#el it to the #lnt >i+e+ in the (urnce, in! ;o9 etc?+.echniclly
FD (n consist o( one 3#h in!uction motor, min ;erin) >nti(riction
;erin)? n! lu;e oil system+
PRIMAR% AIR 6AN=PA 6AN:
/rimry ir (n is use! (or mi9in) o(
col! ir o( FD (n outlet ith hot ir o( ir #reheter outlet+ The min
(unction o( this is to trns#ort #ul"erise! col (rom the mill to (urnce+
.i9in) o( hot ir n! col! ir is necessry ;ecuse it is nee!e! to
mintin the tem#erture o( the #ul"erise! col (rom 0Q to -0Q (or
;etter trns#ort o( col n! ;etter com;ustion in the (urnce+
.echniclly the construction o( /A (n is sme s FD (n+
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T0( E)(,tri,a) !-st(m:/
The electricl system ;siclly strts t the tur;o lterntor n!
throu)h the GT>)enertor trns(ormer? to the sitchyr! n! nlly to
the trnsmission lines+ In ;eteen the netor% consists o( mny
isoltors, circuit ;re%ers, T, /T n! other mechnisms+ At .T/ the
tur;o lterntor )enertes "olt)e o(
17+87B2>5nit61C&C3C4?,1'+'B2>5nit67C'?, &1 B2> /hse II?+ The GTs
ste#s this u# to &&0 B2>400B2 (or /hse II?+ The trnsmission is to
Blynesri ,$urn#ur,$oror,Dur)#ur n! (or #hse IIthe
trnsmission is to .ython, DT/, Jmshe!#ur+
There(ore the electricl system is :
For Unit+, to - .
G(n(rat'r GT 223
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GENERATOR &A!IC PRINCIPLE AND
CON!TRUCTION: Prin,i+)(:
Genertor con"erts mechnicl #oer into electricl (orm n! (ee!s it
into the #oer system netor% + The or%in) #rinci#le ;ehin! the
o#ertion o( )enertor is Fr!ys =s o( electrom)netic in!uction+ The in!uce! lterntin) "olt)e in )enertor cn ;e e9#resse! s
EL4+44(TW 2olt
*here,
EL 2olt)e in!uce! in "olt+
(L(reMuency o( rottion in
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3+$erin) n! lu;riction 4+Terminl $ushin) n! $us
!uct
7+E9cittion system '+ li# rin) n! $rush )er
ssem;ly
8+oolin) system + elin) system
ttor:
The sttor em;o!ies the core, sttor in!in) n! hy!ro)en coolers n!
#ro"i!es )s ti)ht enclosure (or hy!ro)en )s+ It com#rises o( n
inner n! n outer (rme+ The outer (rme is ri)i! (;ricte! structure
o( el!e! steel #ltes c#;le o( ;erin) the #ressure !ue to minore9#losion o(
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TUR&O GENERATOR
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E9chn)es het in the e+)+ micnite? is use! (or linin) the slots+ *ith increse in
)enertor c#city rotor in!in)s use! to crry (irly hi)h !irect
current (or suPcient m)netic stren)th+ This hi)her lo!in) cuses
consi!er;le mount o( het loss n! lr)e rotors incor#orte
com;intion o( hollo con!uctors ith slots or holes rrn)e! to
#ro"i!e (or circultion o( the coolin) )s throu)h the ctul con!uctors
;y )# #ic% u# metho! +Due to "ery hi)h rottionl s#ee! centri(u)l(orce tries to li(t the in!in) out o( the slots+
o they re contine! in #ro#er #lce ;y !urlumin e!)es+ The en!
turns outsi!e the slots re co"ere! ;y nonm)netic steel retinin) en!
rin)s n! re secure! to the rotor ;o!y+ The en! in!in) re insulte!
(rom retinin) rin)s ith the hel# o( )lss e#o9y mol!e! se)ments+ The
retinin) rin) is sin)le #iece (or)in) hich #rotects the rotor en!
in!in) (rom hi)h centri(u)l (orce+
E7CITATION !%!TEM O6 TUR&O GENERATOR:/
The #ur#ose o( e9cittion system is to continuously #ro"i!e the
##ro#rite mount o( D+ el! current to the )enertor el! in!in)+
The e9cittion system is reMuire! to (unction reli;ly un!er the (olloin)
con!itions o( the )enertor n! the system to hich it is connecte! +
i?Durin) strt u# o( the )enertor+
ii?Durin) ste!y stte o#ertin) con!ition+
iii?At the time o( trnsient !istur;nces >!ue to su!!en ##lictions orremo"l o( lo!?+
i"?Durin) #rolon)e! system !istur;nces+
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The sim#lest cse is tht o( !urin) strt u#
hen the )enertor is runnin) t rte! s#ee! ith )enertor circuit
;re%er o#en>rmture o#en circuite!?+ The terminl "olt)e ill
increse ith the increse in el! current+ Amount o( el! current
reMuire! ill ;e (unction o( only the terminl "olt)e+ $ecuse o(
m)netic sturtion more el! current ill ;e reMuire! to #ro!uce n
increment o( rmture "olt)e t hi)h "olt)e thn t lo "olt)e+ This
ill ;e )o"erne! ;y o#en circuit chrcteristics>O++? o( the mchine+
A(ter the closin) o( )enertor circuit ;re%er the mchine is connecte!
to the system n! o#ertes in #rllel ith other mchines connecte!
to the system+ The mount o( el! current reMuire! ill ;e (unction o(
the terminl "olt)e s ;e(ore n! lso the lo! current n! the #oer
(ctor+ This ill ;e )o"erne! ;y the 2cur"es o( the mchine+ 5nli%e the
#re"ious cse i( the )enertor is connecte! to lr)e system chn)e in
e9cittion current controls the recti"e #oer>2AR? n! the #oer
(ctor only ith "ery minor inHuence o( the terminl "olt)e+ .ore
se"ere !uty the e9cittion system reMuires to #er(orm u#on is !urin)
system !istur;nces+ At the time o( trnsient !istur;nces the
)enertor "olt)e my !i# or rise momentrily+ The e9cittion system
must res#onse (st to correct this Muic%ly n! st;ly+ Durin) #rolon)e!
!istur;nces>hich my lst (rom se"erl secon!s to se"erl minutes?
the e9cittion system my reMuire to o#erte t it m9imum or ceilin)
out#ut+ Thus #ro#erly !esi)ne! e9cittion system shoul! #ermit
?lose control o( the )enertor "olt)e to mtch closely to the system
"olt)e ;e(ore synchronition+
;?lose control o( 2AR (ter synchronition o( the mchine, ithout
loss o( st;ility or o"erhetin) o( the el! system+
c?O#ertion o( the system t its m9imum or ceilin) t the time o(!istur;nces in the system+
DEVELOPEMENT O6 E7CITATION !%!TEM:
*ith increse in
)enertor c#city n! com#le9ity o( interconnection in #oer system,
im#ro"e! techniMues in )enertor e9cittion h"e ;een !e"elo#e! ith
the im to chie"e hi)her c#city, i!el rte o( res#onse, sim#licity,
reli;ility, ccurcy, sensiti"ity etc+ In the erlier !esi)ns se"erl
conce#ts )o"ern the mority o( the e9cittion system, such s? E9citers ere commuttor ty#e n! sel( e9cite!+
;? E9citers ere sh(t !ri"en n! motor !ri"en rottin) mchines+
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c? 2olt)e re)ultors inclu!e! m)netic or rottin) m#liers or
com;intion o( ;oth+
!? .nul control s ;y mens o( rheostt+
Ne9t )enertion o( e9cittion system intro!uce! neerconce#ts+ ome o( hich ere
? 5se o( semicon!uctors (or rectiction+
;? A>utomtic? "olt)e re)ultor ith trnsistor #rem#liers n!
thyristors +
c? Ne conce#ts o( mnul control+
!? Elimintion o( commuttors+
e? Ne #hysicl rrn)ements,
(? Ne mintennces #roce!ures +
/resent !y e9cittion system h"e ;een #romote! ;y
? #city to meet "ery hi)h "lues o( e9cittion suit;le (or unit
c#cities s hi)h s 700.* or e"en more+
;? 5se o(
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n! )enertes #ermnent "olt)e >usully 400 " t 400 A2R? is the hert o( e9cittion system o(
)enertor+ No !ys the A2R uses semicon!uctor elements to chie"ehi)h reli;ility ith "ery (st res#onse+ It hs to in!e#en!ent
chnnels, the Auto chnnel ith close! loo# "olt)e re)ultion n! the
.nul chnnel ith o#en loo# re)ultion+ The to chnnels o( the
"olt)e re)ultor re !esi)ne! (or o#ertion either on i? sttion
u9iliry A #oer su##ly n! ii? #oer su##ly (rom )enertor terminl
or #ilot e9citer s the cse my ;e+ $oth the uto n! mnul chnnels
consist o( #oer #rt n! control #rt+
ome o( the slient (etures o( A2R re :
? #;ility o( mintinin) constnt terminl "olt)e o"er i!e
o#ertin) rn)e n! mintinin) #ro#er shre o( recti"e lo!
mon) the #rllel runnin) mchines+;? /ro"ision (or risin) the e9cittion le"el Muic%ly >el! (orcin) ? in
cse o( (ult or "olt)e !i# to increse the trnsient st;ility limit
o( the system+
c? In cor#ortion o( suit;le circuitry to m%e the re(erence "olt)es liner (unction o( (reMuency or tur;o )enertor u# to the e!)e
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C'')in* ;ans /ro#eller ty#e coolin) (ns t ;oth the en!s o( rotor re
#ro"i!e! (or (orce! circultion o( ir coole! mchines ?insi!e the )enertor+ Fn hu;s re m!e(rom lloy steel (or)oin) n! re shrun% tte! on the rotor sh(t+ The
lloy steel cst (n ;l!es re 9e! on the (n hu; throu)hout its
#eri#hery ith the hel# o( stren)th lloy steel nonm)netic conicl
#ins+ These (n ;l!es re esily remo";le (rom the hu;+ Fn shiel!s
re #ro"i!e! to )ui!e the )s Ho+ Fn shiel!s re 9e! to the en!
shiel!s+
!PECI6ICATION O6 TUR&O GENERATOR:/
For 1nit+, to 2
B*:&10.*
#+(:0+7 l)B2A:&48,000
ttor "olt)e:17+87 B2
ttor m#ere:-070 A
Rotor "olt)e:310 2
Rotor m#ere:&700A
R#m:3000
FreMuency:70
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B2A:&-4100
ttor "olt)e:1'+7 B2
ttor m#ere:10&-1 A
Rotor "olt)e:&-&2
Rotor m#ere:&3-7A
R#m:3000
FreMuency:70
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Acti"e /oer: 1344B*
urrent: 3&00A
107A
2olt)e: 4&02
&&0KC&&2
#ee!: 70C
70C
FreeMuency: 170 B#:/
B*:380
2olts D:'00
Am#s D:'300E9cittion 2olts D:108
E9cittion Am#s D:14&
R#m:3000
oolnt: Air
Insultion lss: F
#eciction: IF34
GENERATOR PROTECTION:/
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*ith the e"er incresin) sie o( the
)enertor cost o( the mchine, the e9#enses (or re#ir n! loss o(
ener)y !urin) the out)e o( the mchine re "ery hi)h+ lo!, (reMuency,
tem#erture? n! ;eyon! the s#ecie! limits+ uch ;norml runnin)con!ition oul! result in )r!ul !eteriortion n! ultimtely le! to
(ilure o( the )enertor+ It my ;e #ossi;le to correct the runnin) o( the
)enertor+ It my ;e #ossi;le to correct the runnin) con!ition (ter the
#rotecti"e rely )i"es n lrm, there ;y "oi!in) the loss o( re"enue
n! !m)e o( the mchine+ In the lter cse , it is necessry to restrict
the !m)e o( the mchine n! ssocite circuit to minimum ;y
t%in) it out (rom the ser"ice+
PROTECTION UNDER A&NORMAL RUNNING CONDITION!: /
?Ov(r ,9rr(nt +r't(,ti'n: The o"er current #rotection is use! in
)enertor #rotection )inst e9ternl (ult s ;c% u# #rotection+
Normlly e9ternl short circuits re clere! ;y #rotection o( the (ulty
section n! re not !n)erous to the )enertor+ I( this #rotection (ils
the short circuit current contri;ute! ;y the )enertor is normlly hi)her
thn the rte! current o( the )enertor n! cuse! o"er hetin) o( the
sttor, hence the )enertors re #ro"i!e! ith ;c% u# o"er current#rotection hich is usully !enite time l) o"er current rely+
;?Ov(r )'a +r't(,ti'n: /ersistent o"er lo! in rotor n! sttor circuit
cuse hetin) o( in!in) n! tem#erture rise o( the mchine+
/ermissi;le !urtion o( the sttor n! rotor o"er lo! !e#en!s u#on the
clss o( insultion, therml time constnt, coolin) o( the mchine n! is
usully recommen!e! ;y the mnu(cturer+ $eyon! these limits the
runnin) o( the mchine is not recommen!e! n! o"er lo! #rotectiontherml relys (e! ;y current trns(ormer or therml sensors re
#ro"i!e!+
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c?Ov(r v')ta*( +r't(,ti'n: The o"er "olt)e t the )enertor
terminls my ;e cuse! ;y su!!en !ro# o( lo! n! A2R
ml(unctionin)+
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recti"e #oer (rom the )ri! inste! o( su##lyin) it+ The #oer (ctor o(
the )enertor ;ecomes c#citi"e n! s result o( this synchronous
runnin) > hi)her sli# (reMuency? o"er hetin) o( the rotor sur(ce t%es
#lce+ In cse the )enertors connecte! to the system cn not su##ly
this recti"e #oer there ill ;e lr)e "olt)e !ro# in the system
le!in) to inst;ility+ The #rotection #ro"i!e! )inst loss o( e9cittion
is ;y n oset .ho rely+ Its o#ertin) chrcteristics is so chosen tht
!urin) e9tremely lo e9cittion (ults ithin the tri##in) one+
)? L'ss '; +rim( m'v(r +r't(,ti'n: In the e"ent o( loss o( #rime
mo"er the )enertor o#ertes s motor n! !ri"es the #rime mo"er
itsel(+ In some cses this con!ition coul! ;e "ery hrm(ul s in the cse
o( stem tur;ine sets here stem cts s coolnt, mintinin) thetur;ine ;l!es t constnt tem#erture n! the (ilure o( stem
results in o"er hetin) !ue to (riction n! in!)e loss ith su;seMuent
!istortion o( the tur;ine ;l!e+ This cn ;e sense! ;y #oer rely ith
!irectionl chrcteristics n! the mchine cn ;e t%en out o( ;r
un!er the con!ition+ $ecuse o( the sme reson continuous "ery lo
le"el o( out#ut (rom the therml sets re not #ermissi;le+ The )enertor
;re%er is tri##e! un!er this con!ition ;y the use o( rely mesurin)
the electricl #oer out#ut o( the )enertor !esi)ne! to o#erte henthe #oer out#ut (ults ;elo selecte! #reset "lue+
h?P')( s)i+ +r't(,ti'n: A )enertor my loss synchronism ith
system ithout losin) the e9cittion+ In this con!ition the mchine my
;e su;ecte! to se"ere mechnicl torMue n! oscilltion ith
conseMuent "rition o( current, "olt)e n! #oer (ctor+ I( the n)ulr
!is#lcement o( the rotor e9cee!s the st;le limit, the rotor ill sli#
#ole #itch+ I( the !istur;nce #ersist the mchine must ;e isolte! (romthe system to #re"ent !m)e to the )enertor n! to minimie #oer
system !istur;nce+ The #ole sli##in) #rotection rely o#ertes on the
criteri tht the n)le o( the )enertor E.F e9cee!s certin 9e!
"lue ith the o#ertion o( the re"erse #oer rely+ The occurrence o(
these criteri re counte! n! the mchine is tri##e! out (ter certin
num;er o( oscilltions+ These relys re c#;le o( !etectin) the rst
#ole sli# con!ition hen sli#, corres#on!in) to the s#ee! o( #ole
sli##in) is in the rn)e o( K0+1U to K10U on 70
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PROTECTION UNDER 6AULT CONDITION:/
a#!tat'r s0'rt ,ir,9it: hort circuits re mon) the (ults hich
cuse the he"iest !m)e to the )enertor+ Not only !o they result in
therml !m)es such s the el!in) o( the core lmintions n!
;urnin) o( the in!in) ;ut lso result in #ossi;le mechnicl !m)e
li%e !e(ormtion o( the en!s o( the coil+ 2ery (st o#ertin) #rotection is
reMuire! , otherise the !m)e my ;e ;eyon! re#ir+ Dierentil
#rotections, inter turn short circuit #rotections re the min #rotection
)inst short circuits in sttor in!in)+ As ;c% u# #rotection (or the
sme (ults, minimum im#e!nce n! o"er current #rotections re
use!+
b#Di(r(ntia) +r't(,ti'n: The #rotection is use! (or !etection o(
internl (ults in s#ecie! one !ene! ;y the Ts su##lyin) the
!ierentil rely+ For n unit connecte! system se#rte !ierentil
relys re #ro"i!e! (or )enertor, )enertor trns(ormer n! unit
trns(ormer in !!ition to the o"erll !ierentil #rotection+ In or!er to
restrict !m)e "ery hi)h !ierentil rely sensiti"ity is !emn!e! ;ut
sensiti"ity is limite! ;y T errors, hi)h inrush current !urin) e9ternl(ult n! trns(ormer t# chn)er "ritions+
,# Int(r t9rn ;a9)t +r't(,ti'n: Inter turn (ults com#rise o( insultion
(ilure ;eteen turns o( the sme in!in) or ;eteen the #rllel
in!in) o( the sme #hse hich cn not ;e !etecte! ;y lon)itu!inl
!ierentil #rotection+ Inter turn (ults h"e commonly ;een
!isre)r!e! on the ;sis tht i( the occur the ill Muic%ly !e"elo# into
erth (ults or #hse to #hse (ults hich ill ;e !etecte! ;y thesensiti"e #rotections #ro"i!e! (or these (ults+ *ith this i!e sometimes
no s#ecic #rotection (or inter interturn (ult is #ro"i!e!+
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)urntee in !"nce tht e9ct current shrin) ;eteen in!in)s t%e
#lce+
# &a,k/9+ im+(an,( +r't(,ti'n: This #rotection is ;siclly
!esi)ne! s ;c% u# #rotection (or the #rt o( the instlltion situte!;eteen the )enertor n! the )enertor n! unit trns(ormers+ A ;c%
u# #rotection in the (orm o( minimum im#e!nce mesurement is use!,
in hich the current in!in)s re connecte! to the Ts in the neutrl
connection o( the )enertor n! its "olt)e in!in)s throu)h /T to
the #hse to #hse terminl "olt)e+ The #ic% u# im#e!nce is set to
such "lue tht it is only ener)ise! ;y short circuits in the one
s#ecie! ;o"e !oes not res#on! to (ults ;eyon! the trns(ormers+
(# !tat'r (art0 ;a9)t +r't(,ti'n: The erth (ult #rotection is the
#rotection o( the )enertor )inst !m)es cuse! ;y the (ilure o(
insultion to erth+ /resent #rctice o( )roun!in) the )enertor neutrl
is so !esi)ne! tht the erth (ult current is limite! ithin 7 n! 10
A./s+ Fult current ;eyon! this limit my cuse! serious !m)e to the
core lmintions+ This le!s to "ery hi)h e!!y current loss ith
resultnt hetin) n! meltin) o( the core+
;# @F stat'r (art0 ;a9)t +r't(,ti'n: In"erse time "olt)e relyconnecte! cross the secon!ry o( the hi)h im#e!nce neutrl
)roun!in) trns(ormer rely is use! (or #rotection o( roun! -7U o( the
sttor in!in) )inst erth (ult+
*#133F stat'r (art0 ;a9)t +r't(,ti'n: erth (ult in the entire sttor
circuits re !etecte! ;y selecti"e erth (ult #rotection co"erin) 100U
o( the sttor in!in)s+ This 100U EC( rely monitors the hole sttor
in!in) ;y mens o( co!e! si)nl current continuously inecte! in the)enertor in!in) throu)h cou#lin)+ 5n!er norml runnin) con!ition
the si)nl current Hos only in the stry c#citnces o( the !irectly
connecte! system circuit+ In cse o( n erth (ult , this c#citnce is
;y#sse! n! the monitorin) current hich is !etermine! minly ;y the
resistnce to erth increses+ This increse! current "lue n!
re#ro!uction o( the si)nl co!e re use! (or the o#ertion o( the rely+
0#R't'r (art0 ;a9)t +r't(,ti'n: Normlly sin)le rotor erth (ult is
not so !n)erous s the rotor circuit is unerthe! n! current t (ult
#oint is ero+ o only lrm is #ro"i!e! on occurrence o( rst rotor erth
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(ult+ On occurrence o( the secon! rotor erth (ult ;eteen the #oints
o( (ult the el! in!in) )ets short circuite!+ The current in el! circuit
increses, resultin) in hetin) o( the el! circuit n! the e9citer+ $ut the
more !n)erous is !istur;e! symmetry o( m)netic circuit !ue to
#rtil short circuite! coils le!in) to mechnicl un;lnce+ e"ere
"i;rtion my seriously !m)e the mchine+ Thus the #rotection
circuit shoul! ;e so !esi)ne! s to )i"e n lrm in cse o(
!e"elo#ment o( 1st rotor erth (ult n! it shoul! tri# the mchine on
the occurrence o( &n! erth (ult+
GENERATOR OPERATION:/
The o#ertion o( the )enertor is concerne! ith the ;sic #rocesses o(
synchronition, lo!in) , "olt)e mintennce, st;ility n! s(e
tri##in)Cshuttin) !on o( the mchine+ In the #oer system the
)enertor is reMuire! to o#erte in #rllel ith other runnin) mchines
n! to shre ;oth cti"e n! recti"e #oer !emn! o( the system+
!-n,0r'niati'n '; *(n(rat'r: The #rocess o( interconnection o(
the )enertor ith the )ri! to hich num;er o( )enertors re lre!y
connecte! is %non s synchronition+ For success(ul synchronition
n! #rllel o#ertion o( the )enertor the "olt)e, (reMuency n!#hse seMuence o( the incomin) )enertor must ;e sme s tht o( the
)ri!>runnin) system ?+ To !etermine the e9ct instnt o( synchronism
synchrosco#e ith three lm#s is #ro"i!e! t the )enertor control
!es%+ In some mchine uto synchronition (cility is lso #ro"i!e!+
$e(ore rollin) o( the TG to mtch the s#ee! o( the mchine
corres#on!in) to the )ri! (reMuency n! incresin) )enertor terminl
"olt)e re!iness o( the mchine itsel( n! it is "rious u9iliries re
to ;e ensure+ The synchronition #rocess is to ;e in close coor!intionith the mechnicl system o( the #oer house+ In )enerl (olloin)
o#ertion n! chec%in) re to ;e crrie! out in ste#s ;e(ore
synchronition o( the )enertor+
&(;'r( ma,0in( starts r'))in* ,0(,k an (ns9r(/
G(n(rat'r a9i)iar- s-st(m:/
?The lu;e oil Ho to )enertor ;erin)s is !eMute ith correct#ressure n! tem#erture n! there is no oil le%)e+
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;?sin)
#oer #lnt (or s(e strtin), runnin) n! shuttin) !on o( electricl
eMui#ments+ These interloc%s #ly "itl role to #re"ent or re!uce
!m)e o( costly eMui#ments !urin) internl (ult or (ult in connecte!
systemC eMui#ments o#ertionl error s ell s (or s(ety o( #ersonnel
n! the system s hole+
GENERATOR In )enerl, it is ;se! i( )enertor #rotection relysinitite nonseMuentil tri# mo!e>lss A? (or unit isoltion+
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seMuentil tri##in) >lss $? #ro"i!es ;etter mens o( tri##in)
stem tur;ine )enertor on some ;norml o#ertin) con!ition here
!elye! tri##in) o( the )enertor ill not result in increse! !m)e to
the tur;ine, )enertor or other electricl eMui#ment+ The reson (or
seMuentilly tri##in) stem tur;ine )enertor is to "oi! the o"er
s#ee! con!ition tht results hen the )enertor min ;re%er is tri##e!
hile stem is su##lie! to the tur;ine+
/ro#er control lo)ic is criticl to the !esi)n o( seMuentil
tri##in) scheme sitches, tri# oil system #ressure sitches etc? hich is
su#er"ise! ;y n electricl =o Forr! /oer relyC Reser"e /oer
rely+ This rely is normlly set to !etect "ery lo #oer le"els n!
incor#ortes ;rie( time !ely o( the or!er o( (e secon!s (or !!e!security+
It hs ;een recommen!e! tht )enertor #rotecti"e relys,
initites nonseMuentil tri# mo!e (or isoltion o( the unit !ue to
electricl (ults+ Only !e"ices #rotectin) unit (rom n ;norml
mechnicl o#ertin) con!ition or n ;norml >not (ulte!? electricl
con!ition or norml shut !on shoul! initite seMuentil tri#+
Class A =oc%out Rely ill o#erte (or the (olloin) con!itions
in!ictin) mor electricl (ults in the Genertor sttor, Genertor
rotor, Genertor Trns(ormer n! 5nit Au9iliry Trns(ormers n!
e9cittion trns(ormer n! ssocite! el! $re%er u;icle n! similr
other (ults s !etile! ;elo:
? Genertor sttor !ierentil rely o#erte!+;? Genertor sttor interturn !ierentil rely o#erte!+
c? Genertor Trns(ormer !ierentil o#erte!!? Genertor Trns(ormer o"erll !ierentil rely o#erte!e? 5nit u9iliry trns(ormer !ierentil rely o#erte!(? Genertor sttor ECF rely>0-7U?o#erte!)? Genertor sttor ECF rely >-7100U? o#erte!h? Genertor rotor erth (ult rely o#erte!i? =oss o( e9cittion rely o#erte!
? Genertor trns(ormer restricte! ECF rely o#erte!%? Genertor o"er "olt)e rely o#erte!
l? Genertor re"erse #oer rely o#erte!m? Genertor trns(ormer o"erHu9in) rely o#erte!n? Genertor trns(ormer ;c%u# ECF rely o#erte!
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o? 5AT ;c%u# ECF rely o#erte!#? $c%u# !istnce rely o#erte!M? Genertor ne)ti"e seMuence rely o#erte!r? $us !ierentil #rotection rely o#erte!
s? GT ;uchhol rely o#erte!t? 5AT ;uchhol rely o#erte!u? Thyristor ;n% (ilure"? Genertor Neutrl isoltor o#en?E$/ #resse!9? GT /R>u!!en #ressure rely?
Class-B loc%out rely ill o#erte (or the (olloin) con!itions:
?$oiler tri#
;? Tur;ine tri#
c?5AT ;c%u# OC rely o#erte!
!?A2R #rotection
Class-C loc%out rely ill o#erte (or the (olloin) con!itions:
?$c%u# !istnce rely o#erte! st)e I
;?Genertor ne)ti"e seMuence st)e Ic?GT ;re%er #rotection
!?GT in!in) tem#ertureC oil tem#erture o#erte!
e? 5n!er (reMuency rely o#erte!
Unit tri+ s(9(n,(:
The !ierence seMuence o( tri##in) shll ;e s
mention ;elo:
?$oiler to Tur;ine to Genertor
;?Tur;ine to Genertorc?Genertor to Tur;ine
G(n(rat'r () br(ak(r int(r)',ks:
Genertor el! ;re%er cn
only ;e close! i( the (olloin) #er missi"es re "il;le
?Tur;ine is runnin) t its rte! s#ee!>3000 r#m (or therml mchine
ith KC tolernce?+
;?To ;e !etecte! ;y s#ee! sitch contct t ATR cu;iclec?All )enertor clssA loc%out rely re in reset con!ition
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!?Fiel! Hushin) system is helthy
G(n(rat'r () br(ak(r tri+ int(r)',ks:
Genertor el! ;re%er cn
tri# throu)h the (olloin) inititin) contcts:
?lssA relys o#erte!
G(n(rat'r () br(ak(r man9a) tri+ b)',k int(r)',ks:
*hen
)enertor is in ser"ice mnul tri##in) o( el! ;re%er is not #ermitte!
oin) to loss o( e9cittion n! su;seMuent hrm(ul eects on the
mchine+ O#ertion o( F rely in!icte tht )enertor is in
ser"ice>connecte! in the )ri!? ith its on ;re%er o( ;us cou#ler
;re%er+ One N contct o( F rely is use! in series ith the mnul
tri##in) circuit o( the el! ;re%er+
G(n(rat'r () br(ak(r a9t'/tri+ b)',k int(r)',ks:
*hen
)enertor is in ser"ice, uto tri##in) >throu)h lssA loc%out
contcts? o( el! ;re%er is #ermitte! only (ter o#enin) o( )enertor
;re%er or trns(er $C ;re%er s cse my ;e n! there ;y !ro# out
o( F rely to "oi! momentry loss o( e9cittion n! su;seMuent
hrm(ul eect on the mchine+
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!in*)( Lin( Dia*ram O; G(n(ratin*
!tati'n"9nit?@ an 8#
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!INGLE LINE DIAGRAM O6 GENERATING
!TATION"UNIT/#
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GENERATOR TRAN!6ORMER
Trnsmission o( #oer t )enerte! "olt)e is not economicl+ The nee!
(or trns(ormers is #rmount (or #oer system consi!erin) the (ct
tht trnsmission losses re minimum (or hi)h "olt)es here s !istri;ution hs to ;e !one t the relti"ely s(e "olt)e+ In essence the
trns(ormer Ztrns(orms "olt)e n! current one le"el to "olt)e
n! current t nother le"el hile %ee#in) the (reMuency n! #oer
le"el unltere!+ o )enertor out#ut "olt)e is ste# u# to the
trnsmission "olt)e system "olt)e ;y trns(ormer %non s
Genertor trns(ormer>GT?+ #city o( )enertor trns(ormer is
!etermine! ;se! on the .2A c#city o( )enertor+ The o#en ty#e
terminls o( the
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GENERATOR TRAN!6ORMER
!+(,i,ati'n '; GT:/
Unit+ , to 2
.%e: $.2A?: 170C&00C&70
FreMuency>B2?: 17+87
=ine urrent o( Am#?: 301C4&C'0&
=ine urrent o( =2>Am#?: 3707C8340C-187 Tem#erture rise o( oil>Q?: 40 o"er m;ient o( 70Q
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Tem#erture rise o( in!in)>Q?: 47 o"er m;ient o( 70Q
*ei)ht:
ore n! in!in)s>%)?: 13-000
om#lete Trns(ormer inclu!in) oil>%)?: 3080
Trns#ort>%)?: &38100
Insultion le"el: %)?: &73&70
Trns#ort>%)?: 10000
Oil Muntity>lit?: 78000Insultion le"el:
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/hse: 1
onnection sym;ol: @N!11
No =o! 2olt)e o( B2?: 4&0C[3
No =o! 2olt)e o( =2>B2?: &1
=ine urrent o( Am#?: &4+8-
=ine urrent o( =2>Am#?: -7&3+
Tem#erture rise o( oil>Q?: 40 o"er m;ient o( 70Q
Tem#erture rise o( in!in)>Q?: 47 o"er m;ient o( 70Q
*ei)ht:
ore n! in!in)s>%)?: 1737&0
om#lete Trns(ormer inclu!in) oil>%)?: &78700
Trns#ort>%)?: 184-00
Oil Muntity>lit?: 7'&&0
Insultion le"el:
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onnection sym;ol: Dyn1
No =o! 2olt)e o( B2?: &1
No =o! 2olt)e o( =2>B2?: 11+7
=ine urrent o( Am#?: 1&3+'4
=ine urrent o( =2>Am#?: &&'1+8
Tem#erture rise o( oil>Q?: 40 o"er m;ient o( 70Q
Tem#erture rise o( in!in)>Q?: 47 o"er m;ient o( 70Q
*ei)ht:
ore n! in!in)s>%)?: 400'7
om#lete Trns(ormer inclu!in) oil>%)?: '&07
Trns#ort>%)?: 70000
Oil Muntity>lit?: &770
Insultion le"el:
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No =o! 2olt)e o( =2>B2?: '+-
=ine urrent o( Am#?: 7'+7 C47+&
=ine urrent o( =2>Am#?: 133+C1047+-
Tem#erture rise o( oil>Q?: 40Q
Tem#erture rise o( in!in)>Q?: 47Q
*ei)ht:
ore n! in!in)s>%)?: 14300
*ei)ht o( oil>%)?: '00
Totl ei)ht>%)?: 30700
Oil Muntity>litre?: 8'70
Insultion =e"el:
Q?: 70Q
Tem#erture rise o( in!in)>Q?: 77Q*ei)ht:
ore n! in!in)s>%)?: &0'00
*ei)ht o( oil>%)?: 17070
Totl ei)ht>%)?: 4'300
Oil Muntity>litre?: 1'-00
Insultion =e"el:
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For Unit+/ an) 0
.%e: $B2?: 3+47
=ine urrent o( Am#?: 3-+8C'7'+0
=ine urrent o( =2>Am#?: &'88+78C&0-1+7 Tem#erture rise o( oil>Q?: 40Q
Tem#erture rise o( in!in)>Q?: 47Q
*ei)ht:
ore n! in!in)s>%)?: 1'800
*ei)ht o( oil>%)?: -00
Totl ei)ht>%)?: 40000
Oil Muntity>litre?: 11000
Insultion =e"el:
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.o!el: AT REIN DR@ T@/E
FreeMuency: 70
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Tem#erture rise o( oil>Q?: 40
Tem#erture rise o( in!in)>Q?: 47
*ei)ht:
ore n! in!in)s>%)?: 34400
*ei)ht o( oil>%)?: &-770
Totl ei)ht>%)?: &14000
For 1nit+3 an) -
.%e: $.2A?: &7C17+'&7
FreMuency>B2?: '+-
=2&>B2?: '+-
=ine urrent o( Am#?: 100+40C'&+877
=ine urrent o( =21>Am#? n! =2&: &0-1+4C1308+407
Tem#erture rise o( oil>Q?: 40
Tem#erture rise o( in!in)>Q?: 47
*ei)ht:
ore n! in!in)s>%)?: 4000
*ei)ht o( oil>%)?: 4'000
Totl ei)ht>%)?: 13&000
But in case of phase II this scheme is dierent and this is
elaborated below- !TATION TRAN!6ORMER "!T#:
Norml source to the sttion u9iliries n! stn! ;y source to the unit
u9iliries !urin) strt u# n! (ter tri##in) o( the unit is ttion
trns(ormer+ \untity o( sttion trns(ormers n! there c#city
!e#en!s u#on the unit sies n! num;ers+ Ech sttion trns(ormer
shll ;e one hun!re! #ercent stn! ;y o( the other+ ttion
trns(ormers shll cter to the simultneous lo! !emn! !ue to strt
u# #oer reMuirements (or the lr)est unit, #oer reMuirement (or thesttion u9iliries reMuire! (or runnin) the sttion n! #oer
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reMuirement (or the unit u9iliries o( runnin) unit in the e"ent o(
out)e o( the unit source o( su##ly+ *e h"e to sttion trns(ormer in
400%" sitchyr!+ It ste#s !on the 400%" )ri! "olt)e to 11%" "olt)e+
!TATION AU7ILIAR% TRAN!6ORMER"!AT#:
ttion u9iliry trns(ormer is lso ste# !on trns(ormer+ It ste#s
!on 11%" "olt)e to 3+3%" "olt)e+ It is minly use! to su##ly the 3+3
%" mchines+ Its hi)h "olt)e is connecte! to the secon!ry o( the T+
Its use is similr to the 5AT t strtin) con!ition n! tri##in) con!ition+
There is to AT (or ech T+
!+(,i,ati'n '; !T:/
.%e: $.2A?: 8&C-0
FreMuency>B2?: 11+7
=2&>B2?: 11+7
=ine urrent o( Am#?: 130
=ine urrent o( =21>Am#?: &&'1+-
=2&>Am#?: &&'1+-
Tem#erture rise o( oil>Q?: 40
Tem#erture rise o( in!in)>Q?: 47
*ei)ht:ore n! in!in)s>%)?: -8'-
*ei)ht o( oil>%)?: 7470
Totl ei)ht>%)?: &14000
Oil Muntity>litre?: '810
Insultion le"el:
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!+(,i,ati'n '; !AT:/.%e: $B2?: 3+47
=ine urrent o( Am#?: 3-+8C'7'+0
=ine urrent o( =2>Am#?: &'88+78C&0-1+7 Tem#erture rise o( oil>Q?: 40
Tem#erture rise o( in!in)>Q?: 47
U!T > !!T:/ There re other to ty#es o( ste#!on 3 #hsetrns(ormer (or internl o#ertion, %non s 5T n! T+ 5T is (e!
(rom 5T sitch ;or! n! T is (e! (rom T sitch ;or!+ These re
!ry ty#e cst resin trns(ormer+ The "olt)e rtio is 11B2C4332 (or ;oth
the trns(ormer+ Air nturl coolin) n! Dyn1 connection is use!+
NGT "NEUTRAL GROUNDING TRAN!6ORMER#: The NGT is use! to #re"ent the )enertor (rom erth (ults+ It com#rises
o( #rimry in!in) n! secon!ry in!in), the secon!ry in!in) is
connecte! ith lo "lue resistnce+ *hen e"er erth (ult rises
he"y current Hos to the #rimry in!in) n! s result n em( is
in!uce! in the secon!ry+ The "olt)e !ro# cross the resistnce is
sense! ;y the NGT rely n! it ctutes to ctute the G$>)enertorcircuit ;re%er? n! thus the )enertor is tri##e!+ $siclly NGT is
ste#!on>&1B2C&&02? trns(ormer+
TRAN!6ORMER AU7ILARIE!:
For #ro#er (unctionin) o( the trns(ormer it is #ro"i!e! ith se"erl
u9iliries su; systems+ $siclly they re:
COOLING !U& !%!TEM:
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onsi!erin) the su;stntil mount o( lo! !eli"ere! ;y #oer
trns(ormer #ro#er coolin) system hs to ;e in #lce in or!er to
#re"ent ny hr!s+ .ostly, OFAF>Oil Force! Air Force!? or
ONAF>Oil Nturl Air Force!? schemes re use!+ There re
r!itors n! (ns s ell+ For OF ty#e coolin) ;utterHy "l"e is
%e#t to #um# oil+• CON!ERVETOR:
ince the oil #lys mor role in the coolin) o( trns(ormer
hence it hs to ;e mintine!+ The conser"tor #reser"es the oil o(
the trns(ormer hile e9#nsion o( oil+• &UCHHOL RELA%:
It is #rotecti"e !e"ice use! only in oil immerse! trns(ormer+ It
#ro"i!es #rotection )inst to ty#es o( (ult, incipient fault n!severe fault + 5n!er inci#ient (ult it )i"es n lrm n! un!er
se"ere (ult it tri#s the trns(ormer (rom the line ;y usin) to
Hots hich cts s sitch+ It is uni"erslly use (or trns(ormer
h"in) rtin) more thn 870 B2A+• &REATHER:
The ;rether ;siclly ;sor;e! ny moisture tht my ;e cuse!
!ue to "#orition o( the oil in trns(ormer+ It contins silic )el,
hich chn)es colour (rom ;lue to ohite s it ;sor;s moisture+ Thus it #ro"i!es n in!ictor mechnism (or the Mulity o( the oil+
• PROTECTION MECHANI!M!:
There re tem#erture sensors, hich cn lrm i( the
tem#erture rises ;eyon! certin limit+ Also the ter su##ly
)ets cti"te! in cse o( hr!s li%e re+
There re lso %e#t RTD>resistnce tem#erture !etector? n!
/R2>#ressure relie( "l"e? (or s(ety+
SWITCHYARDIt is sitchin) sttion ,hich hs the (olloin) cre!its:
V .in lin% ;eteen )enertin) #lnt n! trnsmission system, hich
hs lr)e inHuence on the security o( thesu##ly+
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V te#u# n!Cor ste#!on the "olt)e le"els !e#en!in) u#on the
Netor% no!e+
V itchin) ONCOFF recti"e #oer control !e"ices, hich h"e eect
on Mulity o( #oer+
In .T/ hs minly to sitchyr!s+ one is &&0B2 n! nother one is
400B2+
These to sitchyr!s re o( three ;us system>lso clle!, one n! hl(
;us system?+
1+ .in ;us I&+ .in ;us II3+ Trns(er ;us
!in*)( Lin( Dia*ram '; 223kv swit,0-ar
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in)le =ine Di)rm O( 400%"
itchyr!
E\5I/.ENT O..ON=@ FO5ND IN *IT
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1. CIRCUIT &REA
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"D'9b)( &r(ak# "!in*)( &r(ak#
2. CURRENT TRAN!6ORMER:/
urrent trns(ormers re ;siclly use! to t%e the re!in) o( thecurrents enterin) the sttion+ This trns(ormer ste#s !on the current
(rom 1'00m#s to 1 m#+ This is !one ;ecuse e h"e no instruments
to mesure such ty#e o( hu)e mount current+ This ty#e o( trns(ormer
re use! to i? #rotection ii? mesurement #ur#ose+
There re 7 cores use! in this ty#e o( T+
CURRENT TRAN!6ORMER
4.POTENTIAL TRAN!6ORMER:/
/otentil trns(ormers ser"e num;er o( (unctions in
#oer system+ They re reMuire! (or the o#ertion o( mny ty#es o(
instrumenttions n! rely #rotecti"e systems+ They re minly use! to
ste# !on the hi)h m)nitu!e o( "olt)e to s"e "lue to incor#orte
mesurin) n! #rotection lo)ics+ They mesures "olt)e n! in
conunction ith T, they mesure #oer+ They (ee! synchroniin)
eMui#ments+ They cn ;e use! s cou#lin) c#citor in #oer line
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crrier netor%+This is use! in &&0B2 itchyr!+
"POTENTIAL TRAN!6ORMER#
5. CAPACITOR VOLTAGE TRAN!6ORMER"CVT#:/
A c#citor
"olt)e trns(ormer >2T? is trns(ormer use! in #oer system toste# !on e9tr hi)h "olt)e si)nls n! #ro"i!e lo "olt)e si)nl
either (or mesurement or to o#erte #rotecti"e rely+ In
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its most ;sic (orm it consist o( three #rts:
to c#citor cross hich the "olt)e
si)nl is s#lit, n in!ucti"e element use! to
tune !e"ice to the su##ly (reMuency n!
trns(ormer to isolte n! (urther ste# !on
"olt)e (or instrumenttion n! #rotecti"e
rely+ The !e"ice hs t lest (our terminls,
hi)h "olt)e terminl (or connection o( hi)h
"olt)e si)nl, )roun! terminl n! t lest
one set o( secon!ry terminls (or connectin)
to the instrumenttion n! #rotecti"e rely+ 2Ts re ty#iclly sin)le
#hse !e"ice use! (or mesurin) "olt)e in e9cess o( one hun!re!
%ilo"olts here the use o( "olt)e trns(ormer oul! ;e uneconomicl+
In #rctice the rst c#citor, 1 is o(ten re#lce! ;y stc% c#citor
connecte! in series+ This result in lr)e "olt)e !ro# cross the stc% o(
c#citor tht re#lce! the rst c#citor n! com#rti"ely smll
"olt)e !ro# cross the secon! c#citor, & n! here the secon!ry
terminls+
@.I!OLATOR:/ $siclly n isoltor is olo! sitch+ The use o( this
isoltor is to #rotect the trns(ormer (rom the other instrument in the
line+ The isoltor isoltes the e9tr "olt)e to the )roun! n! thus ny
e9tr "olt)e cnnot enter the line+ Thus n isoltor is use! (ter the
;us (or #rotection lso+ To isoltor must ;e %e#t in ;oth si!e o(
;re%er+
Ty#e o( isoltor use! in &&0B2:
i?entrl Rotte Dou;le$re%
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"CRD
Ty#es o( isoltor use! (or 400B2:
i? horiontl centrl
;re%?
ii? #nto)r#h
HC& Pant'*ra+0 is')at'r
8. EARTH !ITCH:/
Erth sitch !ischr)es the c#citi"e "olt)e
store! in line on )enertor si!e in isolte! system ust (ter o#enin) o(
$ n! isoltor+ *hen erth sitch is connecte! to the isolte! ;ut un
!ischr)e! system it !ischr)es the store! ener)y to the erth, so tht
mintennce or% cn ;e crrie! out either in line or in )enertor si!e+
Erth sitch shoul! ;e o#erte! only hen the isoltors re o#en+ In.T/ ll erth sitches cn ;e o#erte! mnully+
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EARTH !ITCH
. LIGHTENING ARRE!TOR:/
=i)htenin) rrestors re the instruments tht
re use! in the incomin) (ee!ers so tht to #re"ent the hi)h
"olt)e enterin) the min sttion+ This hi)h "olt)e is "ery
!n)erous to the instruments use! in the su;sttion+ E"en theinstruments re "ery costly, so to #re"ent ny !m)e li)htenin)
rrestors re use!+ The li)htenin) rrestors !o not let the li)htin)
to (ll on the sttion+ I( some li)htenin) occurs the rrestors #ull
the li)htenin) n! )roun! it to the erth+ In ny su;sttion the
min im#ortnt is o( #rotection hich is rstly !one ;y these
li)htenin) rrestors+ The li)htenin) rrestors re )roun!e! to the
erth so tht it cn #ull the li)htenin) to the )roun!+ The
li)htenin) rrestors or% ith n n)le o( 30Q to 47Q m%in) cone+ In 400%" sitchyr! )#less rrestor re use! )# less
mteril is ^nOX+
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LIGHTENING ARRE!TOR AVE TRAP
B. av( Tra+s:/
*"e tr# is nothin) ;ut =R circuit hich cn tr# the hi)h(reMuency communiction si)nls sent on the line (rom the remote
su;sttion n! !i"ertin) them to the telecomCtele #rotection #nel
in the su;sttion control room >throu)h cou#lin) c#citor n!
=.5?+This is rele"nt in /oer =ine crrier ommuniction>/=?
systems (or communiction mon) "rious su;sttion ithout
!e#en!ence on the telecom com#ny netor%+ The si)nls re
#rimrily tele #rotection si)nls n! in !!ition , "oice n! !t
communiction si)nls throu)h sme #oer line+ The "e tr# oers hi)h im#e!nce to the hi)h (reMuency
communiction si)nls thus o;structs the Ho o( these si)nls in to
the su;sttion ;us;rs+ I( there ere not to ;e there, then si)nl
loss is more n! communiction ill ;e ineecti"eC#ro;;ly
im#ossi;le+ The totl systems occurs ;y usin)
mo!ultionC!emo!ultion (ctors throu)h trnsmitter n! recei"er+
.&9s bar > C)am+ ttin*s:/
The ;us is line in hich the incomin) (ee!ers come into n! )et
into the instruments (or (urther ste# u# or ste# !on+ There my ;e
!ou;le line in the ;us so tht i( ny (ult occurs, other cn or%s+
Thus the su##ly ill not sto#+
In .T/ there h"e to sitchyr!s ith three ;us+
i?.in ;us1 ii?.in ;us Y& Y$uses re min source o( #oer in #oer
system )ri! the )enertors or the lterntor re connecte! in #rllel to
the min ;us 1 or & to su##ly the #oer in the )ri!+
iii?Trns(er ;us_5sully there is no #oer t the time o( norml
o#ertion in trns(er ;us o( )enertin) sttion+ *hen there is (ult
in certin line so #oer cnnot ;e trns(erre! to min ;us+ o
trns(er ;us is use! to trns(er the #oer (rom one min ;us to other
min ;us+
In .T/ &&0B2 sitchyr! hs 31no+o( $y+Amon) them si9 (or
GT,tel"e (or =ine,"e (or T,to (or 0.2A Trns(ormer,(our (or $uscou#ler,to (or $us tie n! 400B2 sitchyr! hs 10 no+ o( ;y+ Amon)
them (our line ;y, to (or GT, to (or T, one (or ;ustie n! nother
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one is ;us cou#ler+ .inly ;us cou#ler is use! to mintin the su##ly
un!er (ult con!itions o( ;re%er+
13.IN!ULATOR!:/
The o"erhe! line con!uctors re ;re n! not
co"ere! ith ny insultin) mterils+ The line con!uctors re
there(ore, secure! to the su##ortin) structures ;y mens o( insultin)
9tures, clle! insultors, in or!er tht there is no current le%)e to
the erth throu)h the su##orts+ Insultors re mounte! on the cross
rms n! the line con!uctors re ttche! to the insultor so s to
#ro"i!e the con!uctors #ro#er insultion n! lso #ro"i!e necessry
clernce ;eteen con!uctors n! metl or%s+ The insultors must
#ro"i!e #ro#er insultion n! necessry clernce )inst the hi)hest
"olt)e in orst tmos#heric con!itions to hich the line is li%ely to ;e
su;ecte!+ The insultor lso #re"ent short circuitin) ;eteen the
!ierent #hse con!uctors n! #ro"i!e necessry mechnicl su##ort
(or the line con!uctors+ Thus the insultors un!ou;tly one o( the most
im#ortnt n! "ulner;le lin%s in trnsmission n! !istri;ution o(
o"erhe! trnsmission n! !istri;ution+
In .T/ sitchyr!s minly !isc ty#e, strin) ty#e, #in ty#e insultors
re use!+
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RATINGS
!68 CIRCUIT &REA)u)e? :'+7 ;r*ei)ht o( com#lete ;re%er :4071%)
*ei)ht o( F] )s :&7 %)
Rte! tri# coil "olt)e :
&&02>D?
Rte! closin) coil "olt)e :
&&02>D?
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!6K CIRCUIT &REA
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CENTRAL ROTATE DOU&LE &REA<
I!OLATOR
.%e :%"? :&47
$I=>%"? :1&70
T>%ACsec? :40
urent>Am#? :1&70
Ty#e o( Dri"e :.otor
.otor 2olt)e>A?>2? :417
ontrol %t+ 2olt)e>D+?>2? :&30
HORIONTAL CENTRAL &REA<
I!OLATOR Ty#e : B2? :4&0
$I= >B2? :14&7
itchin) Im#ulse>B2? :1070C1&47
/a >B2? :'10
T>BACsec? :40
*ei)ht o( isoltor>%)? :1-70 ##ro9FreMuency>A? :&000
Ty#e o( !ri"e :.otor
.otor "olt)e>A?>2? :417
ontrol "olt)e>D?>2? :&&0
*ei)ht o( !ri"e>%)? :100
PANTOGRAPH T%PE I!OLATOR Ty#e :/nto)r#h
2olt> B2? :4&0
$I= >B2? :14&7
itchin) Im#ulse>B2? :1070C1&47
/a >B2? :'10
T>BACsec? :40
*ei)ht o( isoltor>%)? :1-70 ##ro9
FreMuency>A? :&000
Ty#e o( !ri"e :.otor
.otor "olt)e>A?>2? :417
ontrol "olt)e>D?>2? :&&0
*ei)ht o( !ri"e>%)? :100
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EARTHING !ITCH Ty#e :Telesco#ic
2olt> B2? :4&0
$I= >B2? :14&7
T>BACsec? :40*ei)ht o( isoltor>%)? :8C#ole
FreMuency>A? :&000
Ty#e o( !ri"e :.otor
.otor "olt)e>A?>2? :417
ontrol "olt)e>D?>2? :&&0
*ei)ht o( !ri"e>%)? :100
PROTECTION O6 !ITH%ARD :
The min #rotections re )i"en to line ;us;rs un!er !ierent (ults
re
1+Distan,( +r't(,ti'n: In this ty#e, the rely o#ertes hen the
rtio o( the "olt)e current chn)es ;eyon! s#ecie! limit+
&+Ov(r ,9rr(nt +r't(,ti'n: All ;uses h"e s#ecic limit to Ho thecurrent, i( current is more ;eyon! this limit, then the oCc rely ill
o#erte+
3+Ov(r v')ta*( +r't(,ti'n: me s oCc #rotection ,ll ;uses h"e
s#ecic limit to ithstn! m9imum "olt)e, i( this "olt)e is o"er,
then the o"er "olt)e rely ill o#erte+
4+Eart0;a9)t +r't(,ti'n: Erth (ult #rotection is one o( the min#rotection o( the lines+ I( there occur ny erth (ult, the erth (ult
rely ill o#erte+
7+Dir(,ti'na) +r't(,ti'n : ometimes (ter occurrin) the erth (ult
in line in r!il system, then the !irection o( the current my chn)e+
Then the !irectionl rely ill o#erte+
!TATION GROUNDING !%!TEM:
/oer sttion )roun!in) systemshll ;e !esi)ne! ? to o;tin eecti"ely lo neutrl to )roun!
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AC in9,ti'n m't'r: An in!uction motor is n lterntin) current
motor in hich the #rimry in!in) o( the sttor is connecte! to
the #oer source n! secon!ry in!in) or sMuirrel c)e
secon!ry in!in) o( the rotor crries the in!uce! current+ There
is no #hysicl electricl connection to the secon!ry in!in), in its
current is in!uce!+D'9b)- (,it(:!-n,0r'n'9s m't'r: It hs con"entionl three #hse sttor+ Its
rotor in!in) is D e9cite! n! its s#ee! is !e#en!ent on the
num;er o( #irs o( sttor #oles+ True synchronous motor is not sel(
strtin), sMuirrel c)e motor or oun! rotor motor re reMuire! to
ccelerte to ner synchronous s#ee!+ *hen o#ertin) t
synchronous s#ee! the #oer (ctor o( the motor cn ;e chn)e!
;y "ryin) the !e)ree o( e9cittion+
T-+(s '; AC m't'rs:
• Muirrel c)e in!uction motor: 3 #h+ *in!in) in sttor, co##er ;rs
in rotor+• *oun! rotor:3 #h+ *in!in) in sttor, 3 #h+ *in!in) in rotor>shorte!
internlly?+• *oun! rotor ith sli# rin): 3 #h+ *in!in) in sttor, 3 #h+ *in!in) in
rotor>terminte! to sli# rin)s?+• ynchronous motor: 3 #h+ *in!in) in sttor, D in!in) in
rotor>terminte! to sli# rin)s?
A,,'rin* t' v')ta*( )(v(): There re lso to ty#es o( A motors,
clle! $oiler circultin) /um#?: 77B*C'+'B2C-+7A
E/>on!ense E9trction /um#?: 3&7B*C'+'B2C3'A
om#ressor .otor: &70B*C'+'B2C&A
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ircultion *ter /um#: 1-&0B*C'+'B2C&17A
In this #oer #lnt ,the motor hose o#ertin) "olt)e is 11%" n!
3+3%" , %non s
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try lo! losses
2rious insultion:lss o( insultion: @ A E $ F <.9 llo;le tem#>Q?: -0 107 1&0 130 177 10
R(as'ns ;'r t0( ;ai)9r( '; m't'rs: $! mnu(cturin) Mulity ontinuous o"er lo!in) FreMuent strts in short !urtion Incorrect settin) C cli;rtion o( #rotection
Im#ro#er mintennce Filure o( interloc%s
DC !%!TEM: There re lys %e#t D system to o#erte the u9iliry system
un!er emer)ency con!ition such s strt u# , tri##in) o( the TG ,
(ilure o( A+
In .T/ #hseII to ;ttery ;n%s re #resent, one (or Internl
#oer house, nother (or sitchyr! control+ In sitchyr! controlroom there is ;ttery room n! n A D$ room+ &&0 "olt D (or
controllin) the #rotection system n! 4 "olt D (or /= system+
There lso ;c% u# ;ttery ;n% is %e#t+
$tteries re connecte! in series+ For chec%in) the helthiness o( the
;ttery s#ecic )r"ity mesurement is !one #erio!iclly ;y
hy!rometer+ In A D$ room Flot n! Flot cum $oost chr)er re
%e#t+
#city o( ;ttery : '47 Ah>&&02 D?
&70Ah>42 D?
Totl ;ttery : 110>&&02 D?
&4>42 D?
@8?L No+ o( #ositi"e #lte>'?K1+
@B/&1 (or 4" D+
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DIE!EL GENERATOR:
In the $lc% Out on!ition hen there is no #oer in Genertin)
ttion (rom Tur;o Genertor n! lso not (rom )ri!,in this con!ition
to su##ly the emer)ency eMui#ment,li%e scnner (n,$F/,ID Fn,el
Oil /um#,Ele"tion ystem throu)h emer)ency ;or!, e nee! this
Diesel Genertor+In e"ery unit there is one DG set n! in cse o( unit
568 n! 56 there is To DG set to su##ly the emer)ency
eMui#ment o( tht corres#on!in) unit+The c#city o( DG et t unit
567 n! 56' is 870B2A+
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CONCLU!ION
Genertion o( Mulity #oer t lo cost ;ein) the
#rero)ti"e o( therml #oer #lnt, D2 .T/ ims
t usin) ;est technolo)ies throu)h e9#erience! hn!s
to )enerte #rot;le outcomes hile scorin) #oints
on en"ironmentl s(ety+
Also, trnsmission o( #oer hile %ee#in) s(ety o(
)ri! s ell s #oer #lnt t si)ht is mssi"e !utytht comes t hn! in the hole #rocess o(
!istri;ution o( #oer+ These re !one ith utmost
cre in D2, .T/ usin) "rious com#onents s
!escri;e! in the #re"ious riteu#s+