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INTRICACIES OFTRANSFORMER
MANUFACTURIN
G
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G MAJOR COMPONENTS
CORE WINDING
DIELECTRIC TANK
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CORE
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LOW RELUCTANCE CRGO MATERIAL FOR HIGHER COEFFICIENT
OF COUPLING AND LOW IRON LOSSES.
EX. 1)M4 – 1.3 WATTS/KG 2) MOH - 1.03 WATTS/KG 3)DK - .!" WATTS /KG
CORE LAMINATION THICKNESS OF .23/.2#/.30 $$.
0.00% $$ CARL&TE INSULATION'SUSTAINA(LE UPTO 1100 *+ C) IN EACHLAMINATED CORE.
USE OF LASER SCRI(ED CORE STEEL TO A,OID (URS A(O,E30 MICRONS AND REDUCE LOSSES
STEPLAP CORE CONSTRUCTION WITH MITERED OINTS FOR MECHANICALSTRENGTH HIGHER (IULDING/STACKING FACTOR
AND PERPENDICULARL& DIRECTED FLUX DISTRI(UTION'TO A,OID INGRAIN AND CROSSGAIN LOSSES).
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STEEPER (-H CUR,E FOR TO A,OID SATURATION AND
O,ER FLUXING CONDITIONS 'CONTINUOUS FOR 110
1 MIN. FOR 12" AND " SECONDS FOR 140 OF RATED ,OLTAGE )
A(ILT& TO SUSTAIN GEOMAGNETIC DISTUR(ANCES WITHOUT
SATURATION OF THE CORE.
USE OF NON MAGNETIC STEEL FOR CLAMP PLATES AND ELIMINATION
OF &OKE (OLTS IN HIGHER CAPACIT&
TRANSFORMERS FOR REDUCED STRA&LOSS
IMPRO,ED INSULATION.
USE OF (OTTON SPACERS IN CORE FOR (ETTERR SPACE FACTOR
AND OIL FLOW.
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WINDING
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ENAMEL PAINTED ELECTROL&TIC GRADE COPPER
T&PE1) PAPER INSULATED COPPER CONDUCTOR
2) CONTINUOUSL& TRANSPOSED CONDUCTOR
MECHANICAL STRENGTH SPACE FACTOR
,OLTAGE CLASS AND T&PE OF WINDINGDECIDES THE (ASIS OF CONDUCTOR
SELECTION.
HELICAL AND SPIRAL WINDINGS ARE
PREFERRED FOR L, WINDING.
DISC WINDING WITH INTERLEA,ING/CROSSO,ER
IS PREFERRED FOR H, WINDING.
USE OF CLAMPING INSULATING RING 'UDL WOOD)
FOR OPTIMIATION OF AXIAL CLEARANCE
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OPTIMIATION OF RADIAL
CLEARANCES THROUGH
S&MMETRICAL
STRESS DISTRI(UTION.
INTERLEA,ING OF WINDINGS
INCREASES ITS MECHANICAL
STRENGTH AND IMPULSE/S.C
WITHSTAND CAPA(ILIT&.
PROPER TRANSPOSITON OF
CONDUCTORS FOR REDUCING
CIRCUATING CURRENTS AND
EDD& LOSSES.
WIDTH THICKNESS % OR
ELSE EDD& CURRENT LOSSES
WILL (E 1"0.
IMPRO,ED INTER TURN
INSULATION AND COOLING
THROUGH THE USE OF
T-SPACERS.
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DIELECTRIC
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T*5 67 89:;5769$*9 O
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6;* A
N*:9= B;
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(USHING OLTC
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FOR DIFFERENT POLLUTION LEVELS
POLLUTION LEVELS CREEPAGE DISTANCE
I. Light ( areas without industries,agricultural or mountain areas ) 16 mm/kV
II. Medium ( areas with industriesnot producing pollution smoke,
Low density o house areas not e!posedto the coast)
"# mm/kV
III. $ea%y (&reas with high density oindustries, high density o
$eating plants producing pollution,areas close to the sea.)
"' mm/kV
IV. Very $ea%y(&reas close to
the coast and e!posed to sea spray,
desert areas, areas e!posed to strong
winds carrying salt and sand etc )
1mm/kV
Example: for 145 kV Bushing with heavy pollution level minimum creepagedistance works to be
145 kV! "5mm#kV $ %&"5mm
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'his is provided at the oil side of
the bushing to control theelectrostatic field inside the
transformer after installation
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(:5
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OLTC ON AUTO-CONNECTED TRANSFORMERS
U1
U2
U1
U2
U1
U2
U1
U2
OPERATING SEJUENCE OF TAP SELECTOR
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OPERATING SEJUENCE OF TAP SELECTOR
DI,ERTER SWITCH
T: S*=*869
O*9:8
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Copyright © 2006 ACNielsena VNU business
Page 20
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SCR OLTC TYPE DESCRIPTION
! 1200 " 60 /#-101$3%
0- &inear 1% " 'e(ersing )ith 1 *iposition
3% " 'e(ersing )ith 3 *ipositions
No, o positions .0 to 3
!nsulation lass o tap seletor.#/C/
!nsulation togroun.60/110/10/220/300
Current 'ating.30/00/600/00/1200/100/100
!-ne poles suitable or 1 phase
!!!-ne poles suitable or 3 phases.star
onnete
SCR
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Copyright © 2006 ACNielsena VNU business
Page 21
3/14/16
SCR
• 7' 8!U&5AN9U89VACUA5!N 7 5'AN87'9' 5AN: AN
!V9'59' 8%!5C; C
#=
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Leakage Flux and stray loss control
Magnetic Field Plot wito!t
"o#e $!nt and Wall $!nt
Magnetic Field Plot wit
"o#e $!nt and Wall $!nt
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P%oce$$ing o& T%an$&o%'e%
Te (!alit) o& a t%an$&o%'e% and con$e(!entl) it$ *e%&o%'ance
and li&e de*end$ e$$entiall) on te d%)ing *%oce$$ ca%%ied o!t
in te &acto%)
Te a$$e'+led acti,e *a%t o& te t%an$&o%'e% i$ eated in te
o,en &o% e-t%action o& 'oi$t!%e !nde% ,ac!!'
P%o*e% d%) o!t i$ ,e%) i'*o%tant el$e te winding$ wo!ld
+eco'e loo$e in $e%,ice and 'a) get di$to%ted !nde% $o%t
ci%c!it condition$
Once te 'oi$t!%e i$ e-t%acted to te de$i%ed le,el oil i$ &illed!nde% ,ac!!' and te t%an$&o%'e% i$ $oa#ed in oil.
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D%)ing and I'*%egnation
Te in$!lation $)$te' in t%an$&o%'e% need !t'o$t attention. Te oil *a*e%and *%e$$+oa%d in$!lation a$ to +e &%ee o& di%t d!$t and 'oi$t!%e &o%
o+taining te o*ti'!' in$!lating *%o*e%tie$.
Moi$t!%e i$ in/!%io!$ to in$!lation $)$te' $ince it %ed!ce$ te elect%ic
i'*!l$e ,oltage $t%engt and te %e$i$ti,it) o& te oil and accele%ate te
dete%io%ation o& $olid in$!lation.
P%oce$$ing eli'inate$ all t)*e$ o& i'*!%itie$ and &o%eign *a%ticle$ &%o'
t%an$&o%'e% .
D!%ing ,ac!!' d%)ing and oil i'*%egnation te ga$e$ t%a**ed in$ide $olid
in$!lation and occl!ded a'ong int%icate *%o&ile o& in$!lation co'*onent$
a%e al$o %e'o,ed wic %e$!lt$ in low *a%tial di$ca%ge ince*tion ,oltage.
O*ti'al !tili0ation o& te e-cellent *%o*e%tie$ o& oil cell!lo$e dielect%ic
$)$te' de*end$ on te e&&icient d%)ing dega$$ing and i'*%egnation
*%oce$$ ado*ted .
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LATEST TRENDS
…
USE O IODE!RADEALE OILS LI"E ESTER OILS
AUTO#ATI$ #ONITORIN! S%STE#S LI"E ON LINE D!A& ON
LINE PD #ONITORIN! ET$'
IRE OPTI$ #ONITORIN! O TE#PERATURES
S RA #EASURE#ENT OR TRANS OR#ERS SI!NATURE
SUR A$E TE#PERATURE #ONITORIN! % T(ER#AL I#A!IN!
INITE ELE#ENT #ET(OD ANAL%SIS TO AVOID
ERRRORESONA$E&(AR#ONI$ RESONAN$E AND PART
)INDIN! RESONAN$E'
USE O DIVERTER )IT( VA$$U# $O#PART#ENT'
RECOMMENDATION FOR VALUE
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RECOMMENDATION FOR VALUE
ADDITION
U'!N@ ;9A5 'UN 5985 5;9 ANU7AC5U'9'A= #9 A8:9 5 CN7!' 5;9 !& 7&% 'A59!8 #9&% 1959'/89C 5 AV! 85A5!C9&9C5'!C!5= !8C;A'@9,
5;9 #U8;!N@ C'99
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THANK YOU