SPECI FICAnON

FOR epoxy CAST COIL u

ORY - TYPE TRANSFORMIltRS

This spccificHtion desc ribes H qUHlity cast co) transformer with sufficient dctHil to

insure thHt true cast coil (nHlSrOlln~r will be offered AdequHtely equipped nnd

experienced mallufncttlrcs with the engineering 1 production Hnd te~t cupabilitics to

do so C~)II meet thc requirements

TECHNICAL OfTAILS shy

1600 [(VATransformer KVA Rl1ting eo e1 Cooling Ons AN (-1 r

Velltilated drymiddot typlType Ggt -f 1l Phases 3 v ( Ij FnqllclJl) 50 Hz ~ flj

Taps on- LOAD plusmn 2 x 25 j -r -1gt - Itshy

100 C Avcluge winding tcmpcnltlllC rise at nltltl current c f1 InsulntiOIl systtfTl temperature 155 C (class F) ~ (~ Ambient temperature 4511 C c r I

105 laquoVPrima) Voltage c fy Primary Cnuncctioll Deltn Co I Sccolld~ry Voltage 04 l(V r P I Secondary COllllection Ynll

C 0 IPrimary Illtcl lightnillg impulse

7S I(V wirhstund voltage ( KY lI~nh ) u fJJ [nslilution level RakcJ short du ration scp111nte source AC

28 5 KV with stnJld Voltage ( K V nll~ ) c PJ J)unllion of short cireni Thermal ( nus) 2 sec c (1 1 Oynamic (pclIl() 500 onsec

Co 7 impedance voltage at ( ISO u C) al main hlp (i 0 (According 10 [EC ) C f I1 Noise level 65 dB CflP1I Partial discharge s 10 pc

G ~ y

Protection Degree [I 21 shy~fY p11

EnviruuUllu(cll ~Iass [(2 ~01

Fl Fire protcCtlOIi r J

Primary and Secondary Coils

The high vo ltage anc1thc low voltage co il s sha ll bc wound with high

connectivity aluminum conductors and then Cllst separately in molds Coils

shall be separated by uniform air spuce thm perm its free circu lation of cooling

air between the coils WindiJllis shall be properly sized insulatcd and

supported for the line and load vo ltages and currcnts to be encountered in

opcration inc luding short circuits When the translormer is properly inswlled

using 15 5 rated insulated material and adelJuately protected Construction or

the transtcllmer shall separate the primary connecLions and Ihe secondary

connections by plDcing then1 on opposite sides olthe cllle The transformer

c()r~larnp shall be grounded to the base through a copper strap and taps shDl1

Ile provided on the primary

Temperature of Cooling air

The TemperatUle 01 coo l in g ail not exceeding the Iollowing

4() C at any tilll~

bull 3()( monthl nv~ ra ~c oJ thc hottest month- -

bull 2()C yearly averltlg~ or the hottest month

And not below

bull -5degC in the case 0( indoor and oUldoor transJorl11 er

Wher lhe l110nthly and yearly averages are as defin ed in 312 0( IFe 60076 - I

~ated power C f) I he trlt1l1slorl11er shall have an aSSIgned rated power lor eaeh wlI1dtng whIch

shall be I11l11ked on the rating plate The transt()J]ller $hall be fu lly rated when

supplied in an enc los ure The rated power relcrs to continuous loading

Overloads

Dry type AN Cooled trans[()rmcrs ean be overloaded ltlecolding to IEC 60905

Operation at higher than rated voltage G~~

The lrans l()) l11el shall be cap~ b l e orserv ice without damage under cond itions

where the )ltItio o( vo ltage over licquency exceeds the corresponding ratio at

rated voltage and rated frequency by no mOIe~t~al~ 5~~ h~ 1 2 oo~-=---~~1EDY

- RtC

Efficiency and losses

The transtormer shall be ciesigncd ror maximum cilieicncy and minim lllTI

losses when compari ng betwecn difkrenttel1Clers the present va lue of the

eapitalied cost oj losses in the transformer sha ll be added to the trans lormer

prtce

Encapsulation

Thc encapsulation process shall involve pre-heating the coils and thcn lilling

each mcIJd with degasscd and thor(lLIghly mixed cpoxy under vacuum Once

ttllecl the coi ls shal l then be oven cured to insure a so lid void [rcc casting

The ove n curing process shall he controlled ancil110nitmcd to insure that etleh

eo ilgtis propelil cured The high voltage co ils shall be subieetcd to haliand full

Iave impulse tests as well as partiltlI dischmgc tests to insurc a propcrly cured

and void-liec casting The epoxy shall contain tillcr material providing

characteristics superior to untilled epoxy including highcl temperaturc rating o

netter helt eoncluetivity better arc resistance and adhesion to the conductor

llus a coclTlcienl oleplm ion clnscr to thilt olthc conductor InatClial

Core Co Pj The core is des igned anci buill to provide the lowcst poss ib le losses The

transformer corc shall consist of thin individually insulmed sheets of high

permeability cold rollcd grain-oriented anel non-aging silicon steel They

shnll be miter-corner-cllt without hurs and hand stacked into a eruc ifltmn

arrangement of different middot idtb or laminations to provide a cross-sectiopn

1110s1 nea rly asscmb ling the circular cross-section inside the low vo ltagc coil

Lamination s shull be cut and stacked utili ing sc t-Iap construction Lo l-eduee

losses Hnci sound Designed tlux densily shall be kept well below saturat ion

( IIi Tesla)

The assemblcd eorc shall be braced wiLh heavy structural steel ltmglc or channel

Lo npply unilorn1 clamping 10 1C(S across ~he entire widLh LOp and botto m

Thc core shall have steel straps tlll1ning top to bottom down Lhe front and back

ofc8ch eMC leg inside the coils Horimnlal 8nd verlical hracing shall he

(hrough-bolttd Lo insure consi$ttnL darnring [()fecs on all parls or the magneLie

sted lam ination

teillperature rated rust-resis tant coating The temperature of the co re metallic

parts and adilccnt materials shall not reach a va lle that will cause damage to

any part or th e transformer

Taps- (-lr )(1 middot5 -t-2X15) The tap are rigidly supportc(~ cast into the epoxy along the cntral [ace of

each high voltage co il taps arc changcd by moving the ncxihlc holLed links

(rolll one connecti ng po int tu the other tap terminals arc clearly nUlllbcred and

retere nced on the trans rormcr nameplate

The tap changer shall be designed to withstand the routinG and type (cst o

speciliec in [rc 60214 101 its own ra ted through curren t

The LUp changer shall sustain the normal and operating conditions 0( tbe

transl(lJIller 1he Following wble inclicaws the rated eUtTetlt at ci lktent steps

AMPIHS (CONNECTION TAPS) Volts

t600 KVA

9975 shy 9261

9024102375

10500 1798

107625 8582

lO25 H379

Co nstructIOn shall consist 01sep~nrte htgh and low voltage coIl lor each phase

mounted coaxially with high low air spacc between coils adequcltc lotmiddotthe rated

volluge potentials Coils shdl be mounted concentrically and supported in

place Ot1lilc trans(ormer core so as to restrain movement in shipping ltmel in

serv ices Each co il shall be supportec on epoxy blocks top anci bottom with

resilient pads to retain the coi ls wh ile penniting thermal expansion under

loading The emc and co il assembly shal l be des igned and manuhtcturcd to

withstand without damage the shon cireui testings as dcrmed in [[C standards

BUS- Cor) All bllS vOlk shall 5e designed to withstand maximum short circuit stresses

when connected to a supply sys tem having a rallt capacity of25 KA

symmetri cal at rated voltage and to meet aItest voltage requiremcnts

o

o

wiLhout aud ihJc or vis ible corona Bus shall be sizcd to maintain a current

density o r Icss thun 155 mnps per square mnl at 100 naJ11eplatc load

l Low vo ltage bus shall he high conductivity material Co nllcctiollS 0 [ coi [

windings to bus shall be l)[uzed or welded using shielded arc tcchniques

designed to provide highjoint integrity Connection and terminal bulling

surJilces shal[ bc tin or si[ver-pl ated Bolted Conncctions shall incl ude

spling washers to maintain bo[ted surlilce pressurc 11 bus shall he sized

to cOlrl(lrnl to industry standctrds and prmtices lor the ~lJnpcres involved

and nwximllm spccilied ambient teJ11peratures

[I High vo ltage bus sha ll he high conductivity material Glazcd pOlcelain

insulators lor slilge strength shall ~lppor t it It sha[1 have bolt- connccted

joint Hilt tcrminal surfaces tin or si lver plated High vOIlltlgc kads shall

be bus or tkxiblc insulDtcd clllic with inelustry accepted types or

term illations Taps shall hl ve Ikxihle cablc or solid links or jumpers

1[1 (jround bus shal l hc copper-hus or comparable bare cond uctor extending

th rull length u rthe enclosure It shall have plOvisions lo mount

appropriale lerminal conncelioll (lr acijnecnl sitchgcar or cxtelmri

grounding

[~ll1closure G f) [rotection degree is [121 with knockdown enclosurc with anticorros ion

trealment has a removable fmnl lace to gain access to the high vo ltage

connection equipmen t with to easy handles

Bae u e) The transtormcr base sha ll be a separale rigid steel weldmcnt capable oj

supporting the core middot- and coil asscmbly and enclosure Construction shall

include provisions Ior lifting as Nell as for jacking and skidding or rolling in

both ciirections Two stainles steel ground pads with two tapped holes for

attaching ground iclds slurll be pmvided one in each diagonally oppositc

corner or the base Lifting provisions shall be designed for lining the

transtormcr nnd the core - and - coil assembly gt separlt1te ly Ol together

~ shyELC -

Primary and Secondary Coils

The high vo ltage anc1thc low voltage co il s sha ll bc wound with high

connectivity aluminum conductors and then Cllst separately in molds Coils

shall be separated by uniform air spuce thm perm its free circu lation of cooling

air between the coils WindiJllis shall be properly sized insulatcd and

supported for the line and load vo ltages and currcnts to be encountered in

opcration inc luding short circuits When the translormer is properly inswlled

using 15 5 rated insulated material and adelJuately protected Construction or

the transtcllmer shall separate the primary connecLions and Ihe secondary

connections by plDcing then1 on opposite sides olthe cllle The transformer

c()r~larnp shall be grounded to the base through a copper strap and taps shDl1

Ile provided on the primary

Temperature of Cooling air

The TemperatUle 01 coo l in g ail not exceeding the Iollowing

4() C at any tilll~

bull 3()( monthl nv~ ra ~c oJ thc hottest month- -

bull 2()C yearly averltlg~ or the hottest month

And not below

bull -5degC in the case 0( indoor and oUldoor transJorl11 er

Wher lhe l110nthly and yearly averages are as defin ed in 312 0( IFe 60076 - I

~ated power C f) I he trlt1l1slorl11er shall have an aSSIgned rated power lor eaeh wlI1dtng whIch

shall be I11l11ked on the rating plate The transt()J]ller $hall be fu lly rated when

supplied in an enc los ure The rated power relcrs to continuous loading

Overloads

Dry type AN Cooled trans[()rmcrs ean be overloaded ltlecolding to IEC 60905

Operation at higher than rated voltage G~~

The lrans l()) l11el shall be cap~ b l e orserv ice without damage under cond itions

where the )ltItio o( vo ltage over licquency exceeds the corresponding ratio at

rated voltage and rated frequency by no mOIe~t~al~ 5~~ h~ 1 2 oo~-=---~~1EDY

- RtC

Efficiency and losses

The transtormer shall be ciesigncd ror maximum cilieicncy and minim lllTI

losses when compari ng betwecn difkrenttel1Clers the present va lue of the

eapitalied cost oj losses in the transformer sha ll be added to the trans lormer

prtce

Encapsulation

Thc encapsulation process shall involve pre-heating the coils and thcn lilling

each mcIJd with degasscd and thor(lLIghly mixed cpoxy under vacuum Once

ttllecl the coi ls shal l then be oven cured to insure a so lid void [rcc casting

The ove n curing process shall he controlled ancil110nitmcd to insure that etleh

eo ilgtis propelil cured The high voltage co ils shall be subieetcd to haliand full

Iave impulse tests as well as partiltlI dischmgc tests to insurc a propcrly cured

and void-liec casting The epoxy shall contain tillcr material providing

characteristics superior to untilled epoxy including highcl temperaturc rating o

netter helt eoncluetivity better arc resistance and adhesion to the conductor

llus a coclTlcienl oleplm ion clnscr to thilt olthc conductor InatClial

Core Co Pj The core is des igned anci buill to provide the lowcst poss ib le losses The

transformer corc shall consist of thin individually insulmed sheets of high

permeability cold rollcd grain-oriented anel non-aging silicon steel They

shnll be miter-corner-cllt without hurs and hand stacked into a eruc ifltmn

arrangement of different middot idtb or laminations to provide a cross-sectiopn

1110s1 nea rly asscmb ling the circular cross-section inside the low vo ltagc coil

Lamination s shull be cut and stacked utili ing sc t-Iap construction Lo l-eduee

losses Hnci sound Designed tlux densily shall be kept well below saturat ion

( IIi Tesla)

The assemblcd eorc shall be braced wiLh heavy structural steel ltmglc or channel

Lo npply unilorn1 clamping 10 1C(S across ~he entire widLh LOp and botto m

Thc core shall have steel straps tlll1ning top to bottom down Lhe front and back

ofc8ch eMC leg inside the coils Horimnlal 8nd verlical hracing shall he

(hrough-bolttd Lo insure consi$ttnL darnring [()fecs on all parls or the magneLie

sted lam ination

teillperature rated rust-resis tant coating The temperature of the co re metallic

parts and adilccnt materials shall not reach a va lle that will cause damage to

any part or th e transformer

Taps- (-lr )(1 middot5 -t-2X15) The tap are rigidly supportc(~ cast into the epoxy along the cntral [ace of

each high voltage co il taps arc changcd by moving the ncxihlc holLed links

(rolll one connecti ng po int tu the other tap terminals arc clearly nUlllbcred and

retere nced on the trans rormcr nameplate

The tap changer shall be designed to withstand the routinG and type (cst o

speciliec in [rc 60214 101 its own ra ted through curren t

The LUp changer shall sustain the normal and operating conditions 0( tbe

transl(lJIller 1he Following wble inclicaws the rated eUtTetlt at ci lktent steps

AMPIHS (CONNECTION TAPS) Volts

t600 KVA

9975 shy 9261

9024102375

10500 1798

107625 8582

lO25 H379

Co nstructIOn shall consist 01sep~nrte htgh and low voltage coIl lor each phase

mounted coaxially with high low air spacc between coils adequcltc lotmiddotthe rated

volluge potentials Coils shdl be mounted concentrically and supported in

place Ot1lilc trans(ormer core so as to restrain movement in shipping ltmel in

serv ices Each co il shall be supportec on epoxy blocks top anci bottom with

resilient pads to retain the coi ls wh ile penniting thermal expansion under

loading The emc and co il assembly shal l be des igned and manuhtcturcd to

withstand without damage the shon cireui testings as dcrmed in [[C standards

BUS- Cor) All bllS vOlk shall 5e designed to withstand maximum short circuit stresses

when connected to a supply sys tem having a rallt capacity of25 KA

symmetri cal at rated voltage and to meet aItest voltage requiremcnts

o

o

wiLhout aud ihJc or vis ible corona Bus shall be sizcd to maintain a current

density o r Icss thun 155 mnps per square mnl at 100 naJ11eplatc load

l Low vo ltage bus shall he high conductivity material Co nllcctiollS 0 [ coi [

windings to bus shall be l)[uzed or welded using shielded arc tcchniques

designed to provide highjoint integrity Connection and terminal bulling

surJilces shal[ bc tin or si[ver-pl ated Bolted Conncctions shall incl ude

spling washers to maintain bo[ted surlilce pressurc 11 bus shall he sized

to cOlrl(lrnl to industry standctrds and prmtices lor the ~lJnpcres involved

and nwximllm spccilied ambient teJ11peratures

[I High vo ltage bus sha ll he high conductivity material Glazcd pOlcelain

insulators lor slilge strength shall ~lppor t it It sha[1 have bolt- connccted

joint Hilt tcrminal surfaces tin or si lver plated High vOIlltlgc kads shall

be bus or tkxiblc insulDtcd clllic with inelustry accepted types or

term illations Taps shall hl ve Ikxihle cablc or solid links or jumpers

1[1 (jround bus shal l hc copper-hus or comparable bare cond uctor extending

th rull length u rthe enclosure It shall have plOvisions lo mount

appropriale lerminal conncelioll (lr acijnecnl sitchgcar or cxtelmri

grounding

[~ll1closure G f) [rotection degree is [121 with knockdown enclosurc with anticorros ion

trealment has a removable fmnl lace to gain access to the high vo ltage

connection equipmen t with to easy handles

Bae u e) The transtormcr base sha ll be a separale rigid steel weldmcnt capable oj

supporting the core middot- and coil asscmbly and enclosure Construction shall

include provisions Ior lifting as Nell as for jacking and skidding or rolling in

both ciirections Two stainles steel ground pads with two tapped holes for

attaching ground iclds slurll be pmvided one in each diagonally oppositc

corner or the base Lifting provisions shall be designed for lining the

transtormcr nnd the core - and - coil assembly gt separlt1te ly Ol together

~ shyELC -

Efficiency and losses

The transtormer shall be ciesigncd ror maximum cilieicncy and minim lllTI

losses when compari ng betwecn difkrenttel1Clers the present va lue of the

eapitalied cost oj losses in the transformer sha ll be added to the trans lormer

prtce

Encapsulation

Thc encapsulation process shall involve pre-heating the coils and thcn lilling

each mcIJd with degasscd and thor(lLIghly mixed cpoxy under vacuum Once

ttllecl the coi ls shal l then be oven cured to insure a so lid void [rcc casting

The ove n curing process shall he controlled ancil110nitmcd to insure that etleh

eo ilgtis propelil cured The high voltage co ils shall be subieetcd to haliand full

Iave impulse tests as well as partiltlI dischmgc tests to insurc a propcrly cured

and void-liec casting The epoxy shall contain tillcr material providing

characteristics superior to untilled epoxy including highcl temperaturc rating o

netter helt eoncluetivity better arc resistance and adhesion to the conductor

llus a coclTlcienl oleplm ion clnscr to thilt olthc conductor InatClial

Core Co Pj The core is des igned anci buill to provide the lowcst poss ib le losses The

transformer corc shall consist of thin individually insulmed sheets of high

permeability cold rollcd grain-oriented anel non-aging silicon steel They

shnll be miter-corner-cllt without hurs and hand stacked into a eruc ifltmn

arrangement of different middot idtb or laminations to provide a cross-sectiopn

1110s1 nea rly asscmb ling the circular cross-section inside the low vo ltagc coil

Lamination s shull be cut and stacked utili ing sc t-Iap construction Lo l-eduee

losses Hnci sound Designed tlux densily shall be kept well below saturat ion

( IIi Tesla)

The assemblcd eorc shall be braced wiLh heavy structural steel ltmglc or channel

Lo npply unilorn1 clamping 10 1C(S across ~he entire widLh LOp and botto m

Thc core shall have steel straps tlll1ning top to bottom down Lhe front and back

ofc8ch eMC leg inside the coils Horimnlal 8nd verlical hracing shall he

(hrough-bolttd Lo insure consi$ttnL darnring [()fecs on all parls or the magneLie

sted lam ination

teillperature rated rust-resis tant coating The temperature of the co re metallic

parts and adilccnt materials shall not reach a va lle that will cause damage to

any part or th e transformer

Taps- (-lr )(1 middot5 -t-2X15) The tap are rigidly supportc(~ cast into the epoxy along the cntral [ace of

each high voltage co il taps arc changcd by moving the ncxihlc holLed links

(rolll one connecti ng po int tu the other tap terminals arc clearly nUlllbcred and

retere nced on the trans rormcr nameplate

The tap changer shall be designed to withstand the routinG and type (cst o

speciliec in [rc 60214 101 its own ra ted through curren t

The LUp changer shall sustain the normal and operating conditions 0( tbe

transl(lJIller 1he Following wble inclicaws the rated eUtTetlt at ci lktent steps

AMPIHS (CONNECTION TAPS) Volts

t600 KVA

9975 shy 9261

9024102375

10500 1798

107625 8582

lO25 H379

Co nstructIOn shall consist 01sep~nrte htgh and low voltage coIl lor each phase

mounted coaxially with high low air spacc between coils adequcltc lotmiddotthe rated

volluge potentials Coils shdl be mounted concentrically and supported in

place Ot1lilc trans(ormer core so as to restrain movement in shipping ltmel in

serv ices Each co il shall be supportec on epoxy blocks top anci bottom with

resilient pads to retain the coi ls wh ile penniting thermal expansion under

loading The emc and co il assembly shal l be des igned and manuhtcturcd to

withstand without damage the shon cireui testings as dcrmed in [[C standards

BUS- Cor) All bllS vOlk shall 5e designed to withstand maximum short circuit stresses

when connected to a supply sys tem having a rallt capacity of25 KA

symmetri cal at rated voltage and to meet aItest voltage requiremcnts

o

o

wiLhout aud ihJc or vis ible corona Bus shall be sizcd to maintain a current

density o r Icss thun 155 mnps per square mnl at 100 naJ11eplatc load

l Low vo ltage bus shall he high conductivity material Co nllcctiollS 0 [ coi [

windings to bus shall be l)[uzed or welded using shielded arc tcchniques

designed to provide highjoint integrity Connection and terminal bulling

surJilces shal[ bc tin or si[ver-pl ated Bolted Conncctions shall incl ude

spling washers to maintain bo[ted surlilce pressurc 11 bus shall he sized

to cOlrl(lrnl to industry standctrds and prmtices lor the ~lJnpcres involved

and nwximllm spccilied ambient teJ11peratures

[I High vo ltage bus sha ll he high conductivity material Glazcd pOlcelain

insulators lor slilge strength shall ~lppor t it It sha[1 have bolt- connccted

joint Hilt tcrminal surfaces tin or si lver plated High vOIlltlgc kads shall

be bus or tkxiblc insulDtcd clllic with inelustry accepted types or

term illations Taps shall hl ve Ikxihle cablc or solid links or jumpers

1[1 (jround bus shal l hc copper-hus or comparable bare cond uctor extending

th rull length u rthe enclosure It shall have plOvisions lo mount

appropriale lerminal conncelioll (lr acijnecnl sitchgcar or cxtelmri

grounding

[~ll1closure G f) [rotection degree is [121 with knockdown enclosurc with anticorros ion

trealment has a removable fmnl lace to gain access to the high vo ltage

connection equipmen t with to easy handles

Bae u e) The transtormcr base sha ll be a separale rigid steel weldmcnt capable oj

supporting the core middot- and coil asscmbly and enclosure Construction shall

include provisions Ior lifting as Nell as for jacking and skidding or rolling in

both ciirections Two stainles steel ground pads with two tapped holes for

attaching ground iclds slurll be pmvided one in each diagonally oppositc

corner or the base Lifting provisions shall be designed for lining the

transtormcr nnd the core - and - coil assembly gt separlt1te ly Ol together

~ shyELC -

teillperature rated rust-resis tant coating The temperature of the co re metallic

parts and adilccnt materials shall not reach a va lle that will cause damage to

any part or th e transformer

Taps- (-lr )(1 middot5 -t-2X15) The tap are rigidly supportc(~ cast into the epoxy along the cntral [ace of

each high voltage co il taps arc changcd by moving the ncxihlc holLed links

(rolll one connecti ng po int tu the other tap terminals arc clearly nUlllbcred and

retere nced on the trans rormcr nameplate

The tap changer shall be designed to withstand the routinG and type (cst o

speciliec in [rc 60214 101 its own ra ted through curren t

The LUp changer shall sustain the normal and operating conditions 0( tbe

transl(lJIller 1he Following wble inclicaws the rated eUtTetlt at ci lktent steps

AMPIHS (CONNECTION TAPS) Volts

t600 KVA

9975 shy 9261

9024102375

10500 1798

107625 8582

lO25 H379

Co nstructIOn shall consist 01sep~nrte htgh and low voltage coIl lor each phase

mounted coaxially with high low air spacc between coils adequcltc lotmiddotthe rated

volluge potentials Coils shdl be mounted concentrically and supported in

place Ot1lilc trans(ormer core so as to restrain movement in shipping ltmel in

serv ices Each co il shall be supportec on epoxy blocks top anci bottom with

resilient pads to retain the coi ls wh ile penniting thermal expansion under

loading The emc and co il assembly shal l be des igned and manuhtcturcd to

withstand without damage the shon cireui testings as dcrmed in [[C standards

BUS- Cor) All bllS vOlk shall 5e designed to withstand maximum short circuit stresses

when connected to a supply sys tem having a rallt capacity of25 KA

symmetri cal at rated voltage and to meet aItest voltage requiremcnts

o

o

wiLhout aud ihJc or vis ible corona Bus shall be sizcd to maintain a current

density o r Icss thun 155 mnps per square mnl at 100 naJ11eplatc load

l Low vo ltage bus shall he high conductivity material Co nllcctiollS 0 [ coi [

windings to bus shall be l)[uzed or welded using shielded arc tcchniques

designed to provide highjoint integrity Connection and terminal bulling

surJilces shal[ bc tin or si[ver-pl ated Bolted Conncctions shall incl ude

spling washers to maintain bo[ted surlilce pressurc 11 bus shall he sized

to cOlrl(lrnl to industry standctrds and prmtices lor the ~lJnpcres involved

and nwximllm spccilied ambient teJ11peratures

[I High vo ltage bus sha ll he high conductivity material Glazcd pOlcelain

insulators lor slilge strength shall ~lppor t it It sha[1 have bolt- connccted

joint Hilt tcrminal surfaces tin or si lver plated High vOIlltlgc kads shall

be bus or tkxiblc insulDtcd clllic with inelustry accepted types or

term illations Taps shall hl ve Ikxihle cablc or solid links or jumpers

1[1 (jround bus shal l hc copper-hus or comparable bare cond uctor extending

th rull length u rthe enclosure It shall have plOvisions lo mount

appropriale lerminal conncelioll (lr acijnecnl sitchgcar or cxtelmri

grounding

[~ll1closure G f) [rotection degree is [121 with knockdown enclosurc with anticorros ion

trealment has a removable fmnl lace to gain access to the high vo ltage

connection equipmen t with to easy handles

Bae u e) The transtormcr base sha ll be a separale rigid steel weldmcnt capable oj

supporting the core middot- and coil asscmbly and enclosure Construction shall

include provisions Ior lifting as Nell as for jacking and skidding or rolling in

both ciirections Two stainles steel ground pads with two tapped holes for

attaching ground iclds slurll be pmvided one in each diagonally oppositc

corner or the base Lifting provisions shall be designed for lining the

transtormcr nnd the core - and - coil assembly gt separlt1te ly Ol together

~ shyELC -

wiLhout aud ihJc or vis ible corona Bus shall be sizcd to maintain a current

density o r Icss thun 155 mnps per square mnl at 100 naJ11eplatc load

l Low vo ltage bus shall he high conductivity material Co nllcctiollS 0 [ coi [

windings to bus shall be l)[uzed or welded using shielded arc tcchniques

designed to provide highjoint integrity Connection and terminal bulling

surJilces shal[ bc tin or si[ver-pl ated Bolted Conncctions shall incl ude

spling washers to maintain bo[ted surlilce pressurc 11 bus shall he sized

to cOlrl(lrnl to industry standctrds and prmtices lor the ~lJnpcres involved

and nwximllm spccilied ambient teJ11peratures

[I High vo ltage bus sha ll he high conductivity material Glazcd pOlcelain

insulators lor slilge strength shall ~lppor t it It sha[1 have bolt- connccted

joint Hilt tcrminal surfaces tin or si lver plated High vOIlltlgc kads shall

be bus or tkxiblc insulDtcd clllic with inelustry accepted types or

term illations Taps shall hl ve Ikxihle cablc or solid links or jumpers

1[1 (jround bus shal l hc copper-hus or comparable bare cond uctor extending

th rull length u rthe enclosure It shall have plOvisions lo mount

appropriale lerminal conncelioll (lr acijnecnl sitchgcar or cxtelmri

grounding

[~ll1closure G f) [rotection degree is [121 with knockdown enclosurc with anticorros ion

trealment has a removable fmnl lace to gain access to the high vo ltage

connection equipmen t with to easy handles

Bae u e) The transtormcr base sha ll be a separale rigid steel weldmcnt capable oj

supporting the core middot- and coil asscmbly and enclosure Construction shall

include provisions Ior lifting as Nell as for jacking and skidding or rolling in

both ciirections Two stainles steel ground pads with two tapped holes for

attaching ground iclds slurll be pmvided one in each diagonally oppositc

corner or the base Lifting provisions shall be designed for lining the

transtormcr nnd the core - and - coil assembly gt separlt1te ly Ol together

~ shyELC -

v

Testing G f) Tests should be accord ing to applica ble IEC standards Certifi ed type and

specia l test reports cover ing spec i lied complete tests s hou ld prov ide

Pu rchaser reserves the right to w itness tcsts Test values not speciljed by

s tandards shall s ubject to the ngrceJ11 cnt between the mltlmriileturcs and the

Purchaser

~~ ~~~ ~r~ yplt i~ ~~ 1) nquil-erncnts or lEe stmdmds 10 1 dry power trans (-()r mc l- These shall include

the t() lI owing bull

I Light ning impulse test

2 Tempera ture middotmiddot rise test

11 Routine tests C9(~ Shall be made on each transi()[[llcr in accordance with requirements olI IC

standards I() dry lype transformer fhese shall include the I()llowing

I Masu remellt olwinding rCSIS[lnee

2 Mcasu re ment oC the voltage rati o and check 01 phase displacement

3 MlasurCl11e nt 01 shon eireLi it impedance and load -_ loss

4 1VleasLlrel11ent of no middot load loss and cu rrcnt

5 Separulted source A C voltage w ithsland test

6 Induced AC withstand vo ltage tcst

7 parti a l discharge measurement

Ill Special tests (Jgt~ ~~t Ct ~~ -fl)

Special tes ts sha ll be made in accordance ith th e req uirements or the me swndmds I() dry lype tranSI()[111CrS when required These shal l inc lude the

foll owillg shy

I MeasurcJ1ent of sOllnd level test

2 S hort c irc uit test

3 Environment tcst

4 Cl imati c lest

5 IWE llEIiAVOR T LST

CI

Accessories ~~fJ An inlanlaneous md maximum lemperature II1dicating th trtllOTlC lcr hltlll be

provided on the fwnl oC trans leJrmcr

The translc)rmcr and their acccssorics shall be able to w ithstand the rated shon

circuit through windings Illl 2 sceonds duration

The tmns[onner and their sha ll be able to withstand dynam ic short circuit

Current thlllugh the windings lo r 500 mscc

The tnlllsformcr shall have a rating plate weatherproo f or stainless sleel

material placed in a clear posi tion namep late in lclrIllation as ca lled for by l Ee

standards sl18 11 he prov ickd This inc ludes

bull f ype of transfornlcr

bull li T codes

MilIlLtJl lctuns nallle

bull Scr ial number

bull Year of n1ltltlU ractu r

bull I nsulation level

bull Numbc[ or phases

bull Ratcd powcr

bull Ra led frcquency

e Rated VO hilge

Q Ilt[ted currcnt

bull Vectur group

bull Impedance voltage at rated CLiITent

bull Type 0 I coo ling

bull Total mass

bull Temperature Iise of windings

Instruction MaOlUlls u c 0 The manLifacturer sha ll sLipply wilh shipm ent urthc transllJrmer complete

install~tiun operation ~md maintenance instruction manuals suitable 101 the

spceilie itcl11(s) hcing sLipplied inclLlding inlormation frol11 the IllanLifacturcr

or DOlch p~[rdtascd accessury It slta ll indudc interconl1cctcd diagramsgt

El i I

E

drawings and instructions describing proceliLHcs I()r items that arc to be shipped

disassemb led but which arc to be assembled an d interconnected [or operati on

when installed

These shall contain spec ia l ri gging instructions as required for unloading

movi ng by skidding or rolling anclli lli ng the transformcr and accessories

Also included shall bc inSlILKtions Ic) tap changing enclosure assembly and

disassembly tempera ture indicawr reading and sClLing procedures and other

inrormation dcsigncd to assist in proper operation and periodic maintenance or

the equipment beillg supp lied Key interlocking provision sha ll be idclllilicd

md seri al numbers supplied

All manuals instructions and suppmti ng draw ings and parts lists supplied by

the manu l~l ct urc and supplemental instruction and data supplied by accessory

manUIltlctllleS shall be in fnglish cJeady readable 1I1t1 arrunged in such format

us to make the subject items easily idcntiJlablc

Drawings

Manull1clurcr shall supp ly a ~ol11plete set o l as manu lilulIIcci drawings anti

vv iring di(lglam- induding inLerconnCCLion diagrams of all componcnls Hnd

assemblies oC the equipment hieh will assist in operation and maintenance or

the equipment All dmwi ngs shall be prepared in accordance wi th current

industry sIandards and guod industr i1 1practice

All iniornmtion shall be in English lltl nguage clea rl y readable with If~ C

symbols devicc numbers and other rcqircmcl1rs Dimensions sha ll be in

centimeters

Spare parts (0 )fv~ tZlI1s 1 ~~ 1it Tender shou ld submit a list 01 recolllmended necded spare pmts

Warranty 0gtf~

The Manu Ieturer shall walTant the dry --- type transformer to be tiee liom

defects in bolll material and workmanship lor period 01 12 months (iom lhe

ti mc or instHllatiol1 or 18 Illonths after shipment ever occurs lilst

EDY RICI shy

CI

Accessories ~~fJ An inlanlaneous md maximum lemperature II1dicating th trtllOTlC lcr hltlll be

provided on the fwnl oC trans leJrmcr

The translc)rmcr and their acccssorics shall be able to w ithstand the rated shon

circuit through windings Illl 2 sceonds duration

The tmns[onner and their sha ll be able to withstand dynam ic short circuit

Current thlllugh the windings lo r 500 mscc

The tnlllsformcr shall have a rating plate weatherproo f or stainless sleel

material placed in a clear posi tion namep late in lclrIllation as ca lled for by l Ee

standards sl18 11 he prov ickd This inc ludes

bull f ype of transfornlcr

bull li T codes

MilIlLtJl lctuns nallle

bull Scr ial number

bull Year of n1ltltlU ractu r

bull I nsulation level

bull Numbc[ or phases

bull Ratcd powcr

bull Ra led frcquency

e Rated VO hilge

Q Ilt[ted currcnt

bull Vectur group

bull Impedance voltage at rated CLiITent

bull Type 0 I coo ling

bull Total mass

bull Temperature Iise of windings

Instruction MaOlUlls u c 0 The manLifacturer sha ll sLipply wilh shipm ent urthc transllJrmer complete

install~tiun operation ~md maintenance instruction manuals suitable 101 the

spceilie itcl11(s) hcing sLipplied inclLlding inlormation frol11 the IllanLifacturcr

or DOlch p~[rdtascd accessury It slta ll indudc interconl1cctcd diagramsgt

El i I

E

drawings and instructions describing proceliLHcs I()r items that arc to be shipped

disassemb led but which arc to be assembled an d interconnected [or operati on

when installed

These shall contain spec ia l ri gging instructions as required for unloading

movi ng by skidding or rolling anclli lli ng the transformcr and accessories

Also included shall bc inSlILKtions Ic) tap changing enclosure assembly and

disassembly tempera ture indicawr reading and sClLing procedures and other

inrormation dcsigncd to assist in proper operation and periodic maintenance or

the equipment beillg supp lied Key interlocking provision sha ll be idclllilicd

md seri al numbers supplied

All manuals instructions and suppmti ng draw ings and parts lists supplied by

the manu l~l ct urc and supplemental instruction and data supplied by accessory

manUIltlctllleS shall be in fnglish cJeady readable 1I1t1 arrunged in such format

us to make the subject items easily idcntiJlablc

Drawings

Manull1clurcr shall supp ly a ~ol11plete set o l as manu lilulIIcci drawings anti

vv iring di(lglam- induding inLerconnCCLion diagrams of all componcnls Hnd

assemblies oC the equipment hieh will assist in operation and maintenance or

the equipment All dmwi ngs shall be prepared in accordance wi th current

industry sIandards and guod industr i1 1practice

All iniornmtion shall be in English lltl nguage clea rl y readable with If~ C

symbols devicc numbers and other rcqircmcl1rs Dimensions sha ll be in

centimeters

Spare parts (0 )fv~ tZlI1s 1 ~~ 1it Tender shou ld submit a list 01 recolllmended necded spare pmts

Warranty 0gtf~

The Manu Ieturer shall walTant the dry --- type transformer to be tiee liom

defects in bolll material and workmanship lor period 01 12 months (iom lhe

ti mc or instHllatiol1 or 18 Illonths after shipment ever occurs lilst

EDY RICI shy

drawings and instructions describing proceliLHcs I()r items that arc to be shipped

disassemb led but which arc to be assembled an d interconnected [or operati on

when installed

These shall contain spec ia l ri gging instructions as required for unloading

movi ng by skidding or rolling anclli lli ng the transformcr and accessories

Also included shall bc inSlILKtions Ic) tap changing enclosure assembly and

disassembly tempera ture indicawr reading and sClLing procedures and other

inrormation dcsigncd to assist in proper operation and periodic maintenance or

the equipment beillg supp lied Key interlocking provision sha ll be idclllilicd

md seri al numbers supplied

All manuals instructions and suppmti ng draw ings and parts lists supplied by

the manu l~l ct urc and supplemental instruction and data supplied by accessory

manUIltlctllleS shall be in fnglish cJeady readable 1I1t1 arrunged in such format

us to make the subject items easily idcntiJlablc

Drawings

Manull1clurcr shall supp ly a ~ol11plete set o l as manu lilulIIcci drawings anti

vv iring di(lglam- induding inLerconnCCLion diagrams of all componcnls Hnd

assemblies oC the equipment hieh will assist in operation and maintenance or

the equipment All dmwi ngs shall be prepared in accordance wi th current

industry sIandards and guod industr i1 1practice

All iniornmtion shall be in English lltl nguage clea rl y readable with If~ C

symbols devicc numbers and other rcqircmcl1rs Dimensions sha ll be in

centimeters

Spare parts (0 )fv~ tZlI1s 1 ~~ 1it Tender shou ld submit a list 01 recolllmended necded spare pmts

Warranty 0gtf~

The Manu Ieturer shall walTant the dry --- type transformer to be tiee liom

defects in bolll material and workmanship lor period 01 12 months (iom lhe

ti mc or instHllatiol1 or 18 Illonths after shipment ever occurs lilst

EDY RICI shy