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Distribution TransformersFunctional Specification Guide

Single-Phase Pad-mounted G201-20-1

Functional Specification for Single-Phase Pad-Mounted Type DistributionTransformers - 1!" #$%

1&0 Scope

1&1 This specification covers the electrical and mechanical characteristics of 5-167 kV Single-Phase Step-!o"n Pad-#ounted !istri$ution Transformers%

2&0 %pplicable Standards

2&1ll characteristics& definitions& and terminolog'& e(cept as specificall' covered in this specification& shall$e in accordance "ith the latest revision of the follo"ing )S*+& *,,,+& !epartment of ,nerg'& and),#+standards%

*,,, Std 57%1.%//0-./// standard *,,, Standard for Standard General 2e3uirements for 4i3uid-*mmersed !istri$ution& Po"er& and 2egulating Transformers

)S* 57%1.%.5-1/ merican )ational Standard for Transformers Pad-#ounted& ompartmental-T'pe& Self-ooled& Single-Phase !istri$ution Transformers "ith Separa$le *nsulatedigh-Voltage onnectors igh Voltage& 89&5//Grd:;1./ Volts and

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Single-Phase Pad-mounted G./1-./-1

'&2 The transformer shall $e designed in accordance "ith this specification and shall have one of thefollo"ing kV ratingsA

5& 1/& 15& .5& 87%5& 5/& 75& 1//& 167

The applica$le kV rating shall $e specified on the in3uir'%

Table 1Transformer and )onnector *igh-$oltage (atings and +lectrical )haracteristics

Transformer

,lectrical haracteristics of the ompletel' ssem$led

igh-voltage onnectors1

igh-voltage 2ating.

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'&' The secondar' voltage shall $e one of the follo"ing% The $asic insulation level ?V@ and 4+lassified Transformer Fluid ?4-,>VL@& ,nvirotemp0F280 fluid%KPer >,! G%4% ./8

,&'ll transformer components shall $e certified to compl' "ith industr' standards "hen tested in

,nvirotemp0 F280 fluid% ertified test reports for each transformer component shall $e provided uponre3uest%

,&, *n addition to the regular locking provision& all access doors or hood shall $e secured $' a recessed&captive& penta head $olt that meets the dimensions set forth in 2ural tilities Service ?2S@ !ra"ing

875%

,& The transformer shall $e of sealed tank construction of sufficient strength to "ithstand a pressure of 7psig "ithout permanent distortion& and 15 psig "ithout rupturing or affecting ca$inet securit'%

,&! The e(terior of the unit shall $e painted #unsell 7G:8%.;1%5 green unless other"ise specified%

8 of = D ugust ./1. D Supersedes /6;/E./1. ooper *ndustries% ll 2ights 2eserved%

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,&" The tank shall include a pressure relief device as a means to relieve pressure in e(cess of pressureresulting from normal operation% The venting and sealing characteristics shall $e as follo"sA

racking pressureA 1/psig M .psig2esealing pressureA 6psig minimumNero leakage from reseal pressure to -=psigFlo" at 15 psigA 85 SF# minimum

,& The tank shall $e complete "ith an anodied aluminum laser engraved nameplate% )ameplate shallconform to *,,, Std 57%1.%//0-./// standard& nameplate %

,&. igh Voltage

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,&11 >vercurrent Protection

,&11&1 The protection scheme provided "ith the transformer shall consist of the follo"ing checkedattri$utes% *f for an' reason a special protection scheme is re3uired it shall $e clearl' stated onthe in3uir'%

/ Standard >ver-current protection shall $e provided $' a dual element -)et assem$l' shall $e used in series"ith an internall' mounted isolation link%

/ Protected Plus )3F4 Primar' overcurrent protection shall $e provided $' a -)et assem$l'%

/ Secondary Protected Plus 5rea#er4 Secondar' over-current and transformer overloadprotection shall $e provided $' a $reaker installed on the secondar' side of the transformer% This$reaker shall have the capa$ilit' to energie and de-energie the transformer $' one hotstickoperation% This device shall $e used in conJunction "ith an e(pulsion fuse on the primar' side ofthe transformer%

/ Protected Plus Magne67 8nterrupter4 Primar' and secondar' over-current and transformeroverload protection shall $e provided $' a $reaker installed on the primar' side of thetransformer% This $reaker shall have the capa$ilit' to energie and de-energie the transformer$' one hotstick operation% This device ma' $e used in series "ith a current-limiting fuse toprovide 5/&/// interrupting capa$ilit'%

/ #agne *nterrupter/ #agne in series "ith current limiting fuse

/ $F8 Protected %9S8 8 :nly4 The transformer primar' shall include a Vacuum Fault *nterrupter?VF*@ to offer loop sectionaliing capa$ilit'% The VF* shall have a ma(imum interrupting rating of1.&/// 2#S"ith resetta$le fault protection through 85 kV% The VF* shall also include a tri-phase

electronic $reaker control "ith over 1// minimum trip settings and 5 selecta$le time currentcurves% The trip settings and curve shall $e as checked $elo"%

Trip Setting QQQQQQQ ?!efault settingsA =/ minimum trip& instantaneous tripA off@Time-urrent urveA / ,F / TF / LF / F /

,&12 >vervoltage Protection

,&12&1 The protection scheme provided "ith the transformer shall consist of the follo"ing checkedattri$utes% *f for an' reason a special protection scheme is re3uired it shall $e clearl' stated onthe in3uir'%

/ Standard )o overvoltage protection is provided "ith the transformer%

/ Primar' overvoltage protection shall $e provided $' an internall' mounted& heav'-dut' distri$utionclass #>V arrester or e(ternall' mounted #%>%V%,% distri$ution-class #>V el$o" arrester%

/ ,(ternall' mounted #%>%V%,% distri$ution-class #>V el$o" arrester ?ST! "henprimar' >P is desired@

/ *nternal& under-oil VariST2 surge arrester

/ Secondar' overvoltage protection shall $e provided $' an e(ternall' mounted& high-energ'& )S*approved light-dut' distri$ution-class arrester%


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/ Storm Trapper %,% ?igh ,nerg'@ lo"-voltage distri$ution-class surge arrester+;ternal mounting

&0 3abeling

&1 temporar' $ar code la$el shall $e attached to the e(terior of the transformer in accordance "ith *,,,Std 57%1.%850-16 standard%

!&0 Finish Performance (eil resistance

ltraviolet accelerated "eathering

$rasion resistance ta$er a$raser

!&2 The enclosure integrit' of the tank and ca$inet shall meet the re3uirements for tamper resistance set forthin *,,, Std 57%1.%.=0-.//5 standard including $ut not limited to the pr' test& pull test& and "ire pro$etest%

"&0 Production Testing

"&1ll units shall $e tested for the follo"ingA

)o-4oad losses at rated currentK

Total losses at rated currentKK

Percent *mpedance at rated current

,(citation current ?1//I voltage@ test

Binding resistance measurement tests

2atio tests using all tap settings

Polarit' and phase relation tests

*nduced potential tests

Full "ave and reduced "ave impulse test

K)o load losses "ill $e reported at 5 C or ./ C for 75 C B2 units& and =5 C or ./ C for 65 C or65;75 C B2 units%

KKTotal losses and impedance values "ill $e reported at 5 C for 75 C B2 units& and =5 C for 65 CB2 units%


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"&2 The manufacturer shall provide the guaranteed average& no-load& and load losses for the unit at =5

"hen specified% These losses "ill $e su$Ject to the tolerance specified in Ta$le 8%

Table 'Tolerance for Transformer 3osses

)um$er of nitson >ne >rder

il level gauge ?dial-t'pe@/ Thermometer ?dial-t'pe@ "ithout contacts/ Pressure;vacuum gauge ?dial-t'pe@/

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11&0 Data >ith Proposal

11&1 The follo"ing data shall $e su$mitted "ith the proposal "hen specifiedA

ore losses

Binding losses

Percent *mpedance

12&0 Ser=ice

12&1 The manufacturer of the transformer shall have regional service centers located "ithin . hours flight timeof all contiguous 9= states% Service personnel shall $e factor' trained in commissioning and routineservice of 3uoted transformers%

,nvirotemp0 and F280 are l icensed trademarks of argill& *ncorporated

= of = D ugust ./1. D Supersedes /6;/E./1. ooper *ndustries% ll 2ights 2eserved%

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