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S&C VistaUnderground Distribution Switchgear

Outdoor Distribution, 15.5 kV through 38 kV

Featuring

Manual,

Remote Supervisory, and

Source-Transfer Models

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Vista Underground Distribution Switchgear Addresses Your Concerns

Areyouwastingmoneyandresourcesontime-

consuming,labor-intensiveroutineoperationofyour

switchgear?

Hascoordinatingupstreamprotectivedeviceswith

downstreamfusingbecomeaheadache?

Areyourcustomerscomplainingthattheydont

wantobtrusivegreenboxesontheirproperty?

S&CsVistaUndergroundDistributionSwitchgear

istheanswertotheseandmanyotherunderground

distributionsystemproblems.S&Cworkedclosely

withelectricutilitiesandpoweruserstoidentifyand

satisfyneedsthatwerenotbeingmetbyconventional

undergrounddistributionequipment.VistaUDSisan

exceptionalproductthatmeetsalloftheseneeds.

VistaUndergroundDistributionSwitchgear

isavailableinmanual,remotesupervisory,and

source-transfermodels.Allmodelsfeatureload-

interrupterswitchesandresettable,vacuumfault

interruptersorarcspinnersinserieswithdisconnect

switches,elbow-connectedandenclosedinasubmersible,SF6-insulated,weldedsteeltank.Vista

UDSisavailablewithuptosixways,inratings

through38kVand25kAsymmetricalshort-circuit.

Largewindowsinthetankprovideaclearviewofthe

opengap,groundposition,andgroundbus.

Remote Supervisory Pad-Mounted Style Vista UDS installation.

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15-kV UnderCover Style Model 422.

Switch terminalsequipped with600-A bushings or 900-A bushings

Bushings and bushing wells arelocated on one side of the gear,reducing operating space requiredfor elbows and cables

Large viewing windows let you seeopen gap and grounded positionson load-interrupter switches and faultinterrupters. Trip indicators are easilychecked too

Optional voltage indicator withliquid-crystal display. You can checkthe integrity of the voltage indicatorby shining a flashlight on the photo-cell-powered test circuit, while placinga gloved finger over the test button.See page 8. No flashlight needed indaylight

Operating panel islocated near grade levelso UnderCover Stylegear is easily operatedfrom a standing position.See page 4

Overcurrent controlreadily programmedwith your PC

Fault interrupterterminalsequippedwith 200-A bushingwells, 600-A bushings,or 900-A bushings

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Compact welded-steel tank protectsswitching and protection components fromthe environment. Stainless-steel constructionstandard in UnderCover Style

Operating panel of Vista UDS gear. Viewing windows, for confirming open gap and grounded position on load-interrupter switches and fault interrupters, are located under hinged covers of voltage indicators.

Pressure gauge(locatedunder window) temperatureand altitude compensated

Operating mechanismsfor switches and faultinterrupterspadlockablein any position

Microprocessor-basedovercurrent controlhoused in watertightenclosure. CTs (not visible)provide power and signal

inputs

Operation selectorprevents inadvertentoperation from closedposition directly togrounded position and

vice versa

Gas-fill port

Theload-interrupterswitchesprovidethree-pole

liveswitchingof600-ampereor900-ampere

three-phasecircuits.Theswitcheshavethree

positions(closed-open-grounded)andprovidea

clearlyvisiblegapwhenopen.The200-ampere,

600-ampere,and900-amperefaultinterrupters

offer40-msfaultclearing,havethree-position

(closed-open-grounded)disconnects,andare

availablewitheithersingle-poleorthree-pole

switching.MostmodelsofVistaUDSusein-series

vacuumfaultinterruptersforfaultclearing.

However,thepopular15-kV,12.5-kAmanualmodels

nowfeaturearc-spinningtechnologyforfault

interruption...reducingtheheightofthetankby

nearlyafoot!

Optional voltage indicatorwith liquid-crystaldisplay. Includes self-test feature

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VistaUDSisavailableinuptosixways.This

meansitcanaccommodateanycombinationofup

tosixbustaps,load-interrupterswitches,orfault

interrupters.Withconventionalpad-mountedgear,

foraloopedfeederwithfourtaps,twounitsofgear

arenecessary.ButwithVistaUDS,onlyonesix-way

unitisneeded.VistaUDSsimplifiesinstallationand

improvesaestheticsbyreducingthenecessary

realestate.

Themodelnumberindicatesthetotalnumberofways,aswellasthenumberofload-interrupterand

fault-interrupterways.Forexample,Model321has

3ways2load-interrupterswitchwaysand1

fault-interrupterway,asshownbelow.

TYPICAL CONFIGURATIONS OF MANUAL AND REMOTE SUPERVISORY VISTA UDS

TYPICAL CONFIGURATIONS OF SOURCE-TRANSFER VISTA UDS

422201

514 624

VT

VT

321

VT

VT

523

VT

VT

532 (split-bus)

321

LOAD

1

LOAD

2

LOAD

3

LOAD

4

LOAD

1

LOAD

2

LOAD

3

LOAD

4

Conventional

pad-mounted

gear

Vista

UndergroundDistribution

Switchgear

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Vista UDS Offers Numerous UnobtrusiveInstallation OptionsOneoptionisthelow-profilepad-mountedstyle.At

15,25,andeven34.5kV,pad-mountedVistaUDSis6

to14inchesshorterthantheaverageSF 6-insulated

gear.AndVistaUDSstotalreal-estaterequirement

islessthanone-thirdthatofatypicalSF 6-insulated

design.ThismeansthatVistaUDSiseasiertositeand

allowsmoreroomforlandscapingoptionsthatfurther

improveaesthetics.VistaUDSsmostinnovativeinstallationofferingis

theUnderCoverstyle.TheUnderCoverstyleisideal

forareaswithstringentreal-estaterestrictionsor

whereaestheticsareextremelyimportant.TheVista

UDSgearisinstalledunderground,butalloperations

areeasilyperformedbyoneoperatoraboveground.

UnderCoverstyleinstallationscanalsosavemoney

byreducingcostsassociatedwithtrenchingandlong

cableruns.

VistaUDSisalsoavailableforfloor-mountedor

wall-mountedvaultinstallations,andinaman-hole

style.Withitscompactdesign,ruggedconstruction,

andinternalvisibleopenpoint,man-holestyleVista

UDSisperfectforapplicationswhereinstallation

spaceislimited.

UnderCover Style.

Vault-Mounted Styleavailable for floor andwall-mounting.

Pad-Mounted Style.

Man-Hole Style.

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1.Rotatetheswitchoperatingshafttotheopen

position,thenconfirmtheopengapthroughthe

largeviewingwindow.SeeFigures1and2.With

ordinaryelbowgear,ontheotherhand,specially

trainedoperatorsneedtoremovetheelbowsfrom

theirbushingsusingashotgunclampsticka

tedioustaskthatmustbecarefullyperformed.See

Figure3.

Vista UDS Operation Is Quicker,Easier, SaferVistaUDSwasspecificallydesignedtosimplify

operatingtasks,enhancesafety,andminimize

thedurationofoutages.VistaUDSiscertified

arc-resistantperIEC298AppendixAA,forcurrents

upto12.5kAsymmetricalfor15cycles(25kA

symmetricalfor15cycles,formodelsrated25kA

short-circuit).Intheeventofaninternalfault,the

enclosurewillretainitsintegrity.JustonepersonisneededtooperateVista

UDS.Theresnoexposuretomediumvoltage.The

procedureissimple:

Figure 3. Operation of typical dead-front gear can beawkward and time-consuming.

Figure 1. Opening load-interrupter switch (or fault

interrupter).

Figure 2. Window cover lifts for viewing switch-bladepositions of load-interrupter switch or fault interrupter.

Fault interrupter furnished on all Vista UDS except 15-kVmanual models.

Groundedpositioncontact

Switch blade inopen position

Closedpositioncontact

Vacuum bottle

Fault interrupter furnished on 15-kV, 12.5-kA manualmodels.

Groundedpositioncontact

Arc-spinningcontact

Closed positioncontact

Switch bladein openposition

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2.Confirmthatthecableisde-energizedsoitcanbe

safelygrounded.Withtraditionalgear,themedium-

voltagecablesmustbetesteddirectlyusinga

clampstick-mountedtester.Butvoltagetestingwith

VistaUDScanbeaccomplishedsimplyandeasily

withouteveraccessingthecables.Simplyusethe

voltageindicatorsshowninFigure4.Thevoltage

indicatorisevenequippedwithaself-testfunction,

soyoucantestthetester.SeeFigure5.

3.Groundthecables.Insteadoftheawkwardtaskof

havingtomovetheelbowstoparkingstands,alongwiththegroundingbushingsorelbows,withVista

UDSyouneedonlyrotatetheswitchoperatingshaft

tothegroundedposition.SeeFigure6.Grounding

caneasilybeconfirmedbylookingthroughthe

viewingwindow.

Thereareevenmorebenefits:Thevoltageindicator

canbefurnishedwithalow-voltagephasingoption.

SeeFigure7.Thisfeatureallowsconfirmationof

properphasingwithouteveraccessingthecables.

VistaUDSallowsfault-locatingandhi-pottingtests

tobeperformedwiththecablesattachedandthe

busenergized.

Photocell forenergizing self-test feature

Test window

Test button

LCD display

Test circuitry can be powered byflashlight or bright sun

Place gloved finger overtest button to begin testing

Figure 4. Voltage indicator.

Figure 5. Testing the voltage indicator.

Figure 6. Grounding load-interrupter switch (or faultinterrupter).

Figure 7. Measuring phase-to-phase voltagePhase1 to Phase 1.

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Overcurrent Controlfor Superior CoordinationVistaUDSutilizesauniquemicroprocessor-based

overcurrentcontrol,housedinawatertightenclosure

mountedonthegear.Theovercurrentcontrol

featuresavarietyofTCC(time-currentcharacteristic)

curveswithselectableinstantaneousanddefinite-

timedelayattributes,forsuperiorcoordinationwith

upstreamprotectivedevicesanddownstreamfusing.

TheparametersfortheTCCcurvesaresetusingapersonalcomputerconnectedtothedataportofthe

overcurrentcontrol.Therearenoknobsordials,

sothesettingscannotbeinadvertentlychangedor

alteredbyunauthorizedpersonnel.Integralcurrent

transformersprovidepowerandcurrentsensing.

Thereisevenaneventrecorderthatcaptures

informationonthelasttwelveoperationsofeach

faultinterrupter.

User-supplied personal computer is attached to the overcurrent control for programming the relay in the field.

Coordinating-speed tap curve with definite-timedelay eliminates miscoordination problemsfrequently encountered with transformer fuses.

1000

Vista TapInterrupter (Phase)Min. Pickup Current: 400ADef. Time Delay: 4 cycle

Phase

Overcurrent Relay

Type: CO-9

Time Dial: 3

Min. Pickup Current:

720ACTI: 0.15 sec.

Transformer-

Primary Fuse

(100E, Standard

Speed)

10

100

.1

1TIME

IN

SECONDS

10

100

1,000

10,000

100,000

CURRENT IN AMPERES

.01

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Remote Supervisory Vista UDSFordistributionautomationapplications,S&Coffers

RemoteSupervisoryVistaUDS.RemoteSupervisory

VistaUDSprovidesautomatedswitchingandfault

protection,andcanalsoperformauto-sectionalizing

withouttrippingthemainbreaker.Automation

featuresarealsoretrofittabletoexistingManualVista

UDS.Motoroperators,currentandvoltagesensors,

andlow-voltagecompartmentareeasilyinstalledin

thefield.

Eachmotoroperatorincludesacontrolboardthat

provideslocalpush-buttonandremoteoperation

betweentheclosed,open,andgrounded

positions.Uptosixcontrolboardscanbe

accommodatedwithinthelow-voltagecompartment,

soanyorallload-interrupterswitchesorfault

interrupterscanbemotoroperated.Themotor

Operatorselector

Padlock featurePosition indicator

Details of motor operator.

15-kV Remote Supervisory Pad-Mounted Style Model 422.

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operatorsmaybebatterypoweredor,optionally,

self-poweredusinginternalvoltagetransformers.

Thelow-voltagecompartmentmayalsocontain

auser-specifiedremoteterminalunitand

communicationdevice,providingacompletely

automatedswitchingandprotectionpackage.

Optionalvoltageandcurrentsensingroundoutthe

RemoteSupervisoryVistaUDSoffering.

AvarietyofRTUshavebeensuccessfully

integratedinRemoteSupervisoryVistaUDS,

including:ACS,HarrisDART,ValmetPoleCAT,

QEI/Quindar,Hathaway/SystemsNorthwest,

MotorolaMOSCAD,andDAQ.

Andthesetransceivershavebeenintegrated:

MetricomUtilinet,MDS,Dymec,H&L,andMotorola.

RTUsandcommunicationdevicesofother

manufacturecanbeaccommodatedtoo;contactyour

nearestS&CSalesOffice.

Details of low-voltage compartment of RemoteSupervisory Vista UDS Model 422.

Push-to-test lamps

Operation counter

Operationpush buttons

Position-indicatinglamps

Connector for portablemotor operator control

Vista motor controls for installation with two motor-operated ways.

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WhenRemoteSupervisoryVistaUDSisfurnished

withanEnergyLine5800SeriesSwitchControl,itcan

beamemberofanIntelliTEAM,usingEnergyLines

revolutionarypeer-to-peercommunications.

IntelliTEAMsoftwaresupportsautomatic

sectionalizingandreconfiguration,significantly

reducingoutagetime.IntelliTEAMspeer-to-peer

communicationnetworkusesdistributedintelligence,

eliminatingtheneedfor,butstillfullysupporting,

aSCADAmasterstation.And,whenRemote

SupervisoryVistaUDSisfittedwithanEnergyLine

switchcontrol,thegearcanbeusedforautomatic

sourcetransfer,withremotecontrolandmonitoring.

RemoteSupervisoryVistaUDSalsoallowstheuser

toremotelytripthevacuumbottlesofanythree-phase

faultinterrupterwayusingexternal,user-specified

relays.Thisadditionalshunt-tripcapabilitypermits

advancedapplicationslikesensitiveearth-groundfault

detection,aswellasprotectiverelayschemesusing

high-speedcommunicationforclosed-loopandopen-

loopsystems.

Portable Motor OperatorLocalmotoroperationofVistaUDSgearisalso

availableforuserswhodonotrequireacomplete

automationpackage.Theportablemotoroperator

includescablingandhand-heldcontrol,allinaneasily

portable,durablecase.

Theoperatoreasilyattachestoanyload-interrupter

switchorsingle-poleorthree-polefaultinterrupter.

Thensimplypluginthepowercableandthecontrol

cable.Thehand-heldcontrolfeaturesopen,close,andgroundpushbuttons,anenablebutton

topreventinadvertentoperation,andaready

indicatinglight.Remote Supervisory Vista UDS with 5800 SeriesSwitch Control.

Vista UDS Portable Motor Operator. Inset shows hand-held control.

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Micro-AT Source-Transfer Control.

Source-Transfer Vista UDSSource-TransferVistaUDSprovidesfullyautomatic

primary-selectiveserviceforone,two,orthree

criticalloadcircuits.Thispackageincludesall

thefeaturesofManualVistaUDS,plustheS&C

Micro-ATSource-TransferControl,three-phase

voltagesensingonsourceways,andinternalpower

providedbyvoltagetransformers.Itisavailablein

common-busandsplit-busconfigurations.

TheMicro-ATSource-TransferControl,locatedin

thelow-voltagecompartment,ensuresahighdegree

ofcritical-loadcontinuitybyminimizinginterruptions

resultingfromthelossofonesource.Excludingthe

intentionaltimedelaytocoordinatewithupstream

protectivedevicesand/ortransitiondwelltime,

transferisachievedin6secondsmaximum.

TheMicro-ATSource-TransferControlutilizes

anadvancedmicroprocessortoperformcontrol

operations,asdirectedbysettingsprogrammed

intothedeviceatthefactoryandinthefield.

Suchsettings,consistingofthecontrolsoperating

characteristicsandvoltage-,current-,andtime-related

operatingparameters,areenteredintothecontrolby

meansofakeypadonthefrontpanel.

Anunbalancedetectionfeaturemaybe

field-programmedintheMicro-ATSource-Transfer

Control.Thisfeatureprotectstheloadsfromany

source-sideopen-phaseconditionatthesamevoltage

astheVistaUndergroundDistributionSwitchgear.

Ifthevoltageunbalanceexceedsapresetreference

levelforaperiodoftimesufficienttoconfirmthat

thelossisnottransient,anoutputsignalisproduced

whichinitiatesautomatictransfertotheothersource.Anovercurrent-lockoutfeaturemaybefurnished

whichpreventsanautomatictransferoperationthat

wouldcloseasourceload-interrupterswitchintoa

fault.Alight-emittingdiodelampindicateswhen

lockouthasoccurred.Testkeysareprovidedfor

simulatinganovercurrentconditiononeachsource.

Case for Vista UDS Portable Operator.

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Standard Three-Phase Ratings123

ApplicableStandard

Amperes, RMS

Frequency,

Hertz

Fault Interrupter Load-Interrupter Switch

Short-

Circuit,Sym.

Main Bus

Continuous

Current7

Continuous,Load

Dropping, andLoad Splitting

(Parallel orLoop

Switching)

456

Fault-Closing,

Sym.

Fault

Inter-rupting,

Sym.

Continuous,

LoadDropping, and

Load Splitting(Parallel or

Loop

Switching)

456

Fault-Closing,

Sym.

Momen-

tary,

Sym.

1 Sec.,Sym.

IEC 50 or 60200 or 630 12 500 12 500 200 or 630 12 500 12 500 12 500 12 500 600

630 25 500 25 000 630 25 500 25 000 25 000 25 000 600

ANSI 50 or 60200 or 630 12 500 12 500 200 or 630 12 500 12 500 12 500 12 500 600

600 25 500 25 000 600 25 500 25 000 25 000 25 000 600

1Refer to the nearest S&C Sales Office for other ratings.

2 IEC ratings have been assigned in accordance with the applicableportions of IEC 265-1 for a Class A switch.

3 ANSI ratings have been assigned in accordance with the applicableportions of ANSI C37.71, C37.72, and C37.73.

4 Fault interrupters and load-interrupter switches are rated 600 amperes(630 amperes IEC) continuous, load dropping, and loop splitting when fur-

nished with 600-ampere bushings (standard for load-interrupter switchesand 25-kA fault interrupters, optional for 12.5-kA fault interrupters). Therating is limited to 200 amperes if 200-ampere bushing wells are used

(standard for 12.5-kA fault interrupters, optional for 12.5-kA load-inter-rupter switches). Models rated 25-kA are only available with 600-amperebushings.

5 Fault interrupters and load-interrupter switches can switch the magne-tizing current of transformers associated with the load-dropping rating. Inaddition, unloaded cable switching ratings are as follows: 10 amperes at

15.5 kV and 20 amperes at 29 kV and 38 kV.

6 900 ampere is also available.

7 1200 ampere is also available.

32,500-ampere peak ten-time duty-cycle rating.

65,000-ampere peak three-time duty-cycle rating. Ten-time duty-cyclefault-clearing rating is 16,000 amperes symmetrical, 41,600 amperes

peak.

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Offi W ld id d

Descriptive Bulletin 680-30June 1, 2004

PrintedinU.S.A.