Unitole UXIEC Medium Voltage switchgear

Safe, reliable MV switchgear

Unitole UX

• Air insulated switchgear• Internal arc classified• LSC2B-PM

• Tested to IEC 62271-20017.5 kV up to 50 kA - 3 s24 k V up to 25 kA - 3 s

Hydraulics

Powering

business

worldwide

Next generation

transportation

Eaton is driving thedevelopment of newtechnologies – from hybriddrivetrains and emission controlsystems to advanced enginecomponents – that reduce fuelconsumption and emissions intrucks and cars.

Higher expectations

We continue to expand ouraerospace solutions andservices to meet the needs ofnew aviation platforms,including the high-flying light jetand very light jet markets.

Building on our strengths

Our hydraulics businesscombines localised service andsupport with an innovativeportfolio of fluid powersolutions to answer the needsof global infrastructure projects,including locks, canals anddams.

Powering Greener Buildings

and Businesses

Eaton’s Electrical Group is aleading provider of powerquality, distribution and controlsolutions that increase energyefficiency and improve powerquality, safety and reliability.Our solutions offer a growingportfolio of “green” productsand services, such as energyaudits and real-time energyconsumption monitoring.Eaton’s Uninterruptible PowerSupplies (UPS), variable-speeddrives and lighting controls helpconserve energy and increaseefficiency.

Eaton delivers the power inside hundreds of products that

are answering the demands of today’s fast changing world.

We help our customers worldwide manage the power

they need for buildings, aircraft, trucks, cars, machinery

and entire businesses. And we do it in a way that

consumes fewer resources.

Automotive

Aerospace

Electrical

Truck

Hydraulics

Automotive

Aerospace

Electrical

Truck

Hydraulics

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MV switchgear technology

is in our DNA

Eaton Corporation is a worldwide leader in the design, manufacture, and sale of safe, reliable and high-performance medium voltage power distribution equipment in accordance with IEC, GB and ANSI standards.

Complete Global Medium Voltage Switchgear Solutions

Eaton, a premier leader in designing and manufacturing powerdistribution and protection equipment in the electrical industry,offers a comprehensive range of medium voltage (MV) solutionsto meet the needs of virtually every application. From productsthat feature cutting-edge design that allow for easy access,maintenance and space savings, to arc-resistant products thatenhance safety, Eaton’s medium voltage solutions provide avariety of products for every need. Additionally, Eaton’s globalservice network provides maximum customer support in allregions of the world.

As one of the few completely vertically integrated and diversifiedindustrial manufacturers in the world, Eaton designs not only MVassemblies, but also the key components that comprise the MVsolutions – from steel housing and circuit breaker compartmentsto vacuum interrupters, circuit breakers, bus systems and fuses.

Eaton’s MV heritage, strengthened by acquisitions such asWestinghouse DCBU, Cutler Hammer, MEM and Holec, hasresulted in breakthrough MV technologies and numerousinternational patents over the years.

Part of Eaton’s complete electrical PowerChain Solutions – which help businesses minimize risks while realizing greaterreliability, cost efficiencies, capital utilization and safety – Eaton’s medium voltage equipment meets all applicablestandards and certifications such as IEC, NEMA / ANSI, GB, UL, IEEE, KEMA and CSA.

When it comes to medium voltage solutions, you can trust theone name with a long history of proven performance: Eaton.

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Eaton’s range of SF6 free switchgear for Medium Voltage

Unitole UX Safe, reliable MV switchgear with sustainability built-in

Innovative in its design, field-proven over forty years of

vacuum circuit breaker production and fully third-party

certified to IEC 62271-100 and IEC 62271-200, Eaton's

new Unitole UX range of compact air insulated with -

drawable Medium Voltage switchgear leads the industry

in safety, reliability, performance and sustainability.

Knowledge andunderstanding

Eaton has over 80 yearsexperience in the design,manufacture and application ofMedium Voltage switchgear.Being at the forefront oftechnological advances, wepioneered the use of vacuumtechnology 80 years ago andintroduced epoxy-resin insulationover 50 years ago. Eaton is stillcommitted to developing, inno -vating and improving - as wellas to reducing size and costs.

Millions of our vacuum inter -rupters have been in operationin every type of environment inthe world, catering for thewidest range of applications. It is this know ledge, under -standing and experience thatmake Eaton the logical choicefor the safe control and protec -tion of distribution systems.

Unitole UX is particularly suitedto provide control and protec tionfor cables, transformers,capacitors and motors usedacross many industries. In factUnitole UX excels anywherethat medium voltage power hasto be switched, controlled andprotected.

Built to the highest qualitystandards

Unitole UX is designed and fullythird-party type-tested to thelatest IEC 62271-200 standards,with full segregation by earthedmetal partitions of all the majorcompartments, and is equippedwith Eaton's very latest range ofIEC vacuum circuit breakerstype W-VACi - which are fullythird-party type-tested inaccordance with IEC 62271-100.

Using Eaton's state of the arttechnology and manufactured inaccordance with the highestquality standards, our engineershave integrated coretechnologies, such as circuitbreaker and mechanism design,vacuum technology, solidinsulation and electrical fieldcontrol to build a reliable andcompact system, which benefitfrom the best practicesincorporated in our currentmedium voltage range.

The system, which comprises acomplete range up to 4000 A,uses only environmentallyfriendly technology andmaterials. Unitole UX is basedon vacuum technology and airinsulation, and is therefore theperfect alternative to

environmentally harmful SF6gas insulated switchgear. It is also produced with fullyrecyclable materials ensuringthat at the end of its life theproduct can be safely andefficiently recycled - providing a wholly sustainable solution

to medium voltage switchgearapplications.

Some applications are:

• Power distribution

• Water and waste watertreatment

• Mining

• Commercial buildings

• Industrial facilities

• Oil and gas (on- and off-shore)

• Marine

• Airports and hospitals.

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A complete range of compact, environmentally-friendly switchgear up to 4000 A

Combining advanced technology with proven

engineering excellence, the Unitole UX range provides

the highest safety and reliability standards without

compromising competitiveness.

As pioneers in vacuum and arc-interruption technologies, furtherdeveloped over 40 years, Eaton has millions of vacuum interrupterssuccessfully operating in multiple applications worldwide; Eaton'slatest vacuum circuit breaker, the W-VACi, sits at the heart ofUnitole UX.

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World leading technology with safety built in

Low initial costs due to:

• Compact footprint

• Cable access from front or rear

• Cable entry from either top or bottom

• Easy-access cablecompartment for ease ofcable connection

• Integrated arc chamber

• Back to wall configurationwith front cable access

Low lifetime cost

The switchgear is type tested tothe latest IEC 62271-200 andhas third-party certification toprove internal arc containmentclassification of AFLR from 25 kA for 1 second and up to 40 kA for 1 second and 50 kAfor 0.5 second. This means

there is minimal risk of harm topersonnel in the unlikely eventof an internal arc in the cablecompartment, vacuum circuitbreaker compartment or thebusbar compartment in anydirection: front, rear and sidesof the switchgear.

Fully type-tested to latest IEC standards

Increasing global legislationconcerning the use of green -house gases such as SF6 gasand their related disposal costs,makes vacuum technology withits reliability, low maintenance,and low environmental impactthe choice for now and thefuture.

As the world strives to reducethe amount of SF6 gas used inall applications there is aresponsibility on the users ofelectrical switchgear to find,where appropriate, alternativesto SF6 gas as an insulation andswitching medium. Air and solidinsulation switchgear systemsincorporating vacuum switchingtechnologies are a reliable, safeand economic alternative foruse in electrical systems below36 kV and therefore should beused instead of SF6 gasinsulated systems.

Modern medium voltageswitchgear employing vacuumtechnology together with airand epoxy resin insulationprovides:

• Minimum number of partsand components

• No special requirements forthe end-of-life disposal of the switchgear

• Environmentally-friendlymaterials used in the design

• No use of SF6-gas forswitching and insulation(green switching)

• No risk of damaging leaks of SF6 gas or of toxic by-products

• Energy-efficient productionand assembly, withenvironmentally friendlyenergy sources

• Minimal number of transitionpoints in the primary designenables low energy lossduring operation

• Only re-usable and/orrecyclable materials used

Low environmental

impact

• Robust maintenance-freedesign with minimumnumber of parts

• W-VACi circuit breaker has along life of 20,000 operationswithout the need for activemaintenance.

• Advanced vacuuminterrupter contact designsprevent hot spots, createless heat and minimiseelectrode erosion to yieldlonger life.

• No SF6 pressure checks and specialised refillingprocedures

Low end of life disposal costsdue to:

• Vacuum switchingtechnology

• Air insulation

• Recycling or re-use of allmaterials possible

• No special decommissioningprocedures necessary

Minimal costs during

service due to:

• Compartments are protectedagainst penetration byobjects

• Internal arc classification ofAFLR provides operatorsafety in the unlikely eventof an internal arc

• Operation only possible withthe circuit breakercompartment door closed

• Logical mechanical andelectrical interlocks preventmal-operation

• Capacitive voltage detectionsystem for verification ofsafe isolation from supply

• In the unlikely event ofvacuum interrupter failurethere is no damage topersonnel and no harmfulgases are emitted.

• Vacuum interrupter contacterosion is negligible

• Fully encapsulated vacuuminterrupters

• Fewer moving parts in thepole unit versus other arcinterruption technologies

Safety, reliability and

performance

• Cable connection and userinterfaces for operation onthe same side of the unit

• Multiple cables per phasewith standard compressionlug for ease of cableconnection

• Secondary cable entry pointson both sides of the lowvoltage compartment topplate

• Secondary cable wire wayruns complete over thelength of the switch gear tohelp with inter-unit wiring.

• Secondary cable terminalspositioned at a goodreachable height within thelow voltage compartment

• Clear and simple,straightforward operationpanels combined with anactive mimic diagram

User friendly

• Complete design third partycertified in accordance withIEC 62271-200

• Internal arc fault tested inaccordance with IEC 62271- 200

• Quality assurance inaccordance with ISO 9001

• Separate compartments for;cable, vacuum circuit breakerand busbars

• Integrated arc chamber

• Routine tested

Reliable and safe in

operation

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The integral arc-chamberevacuates the gassesassociated with an internal arc.Optional standard parts areavailable to extend the arcchamber; flanges and grilles areavailable to exhaust the gassesoutside the switchgear room.

Arc chamber1

The compartment issegregated with earthed metalpartitions and has ample spacefor control and protectiondevices.

Low voltagecompartment

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A fully segregated metal wire-way is mounted at the top ofeach switchgear panel thatconnects together to form acontinuous low voltage wire-way that runs along the entirelength of the switchgear.

Low voltage wire-wayfor inter panel wiring

2

Unitole UX vacuum technology switchgear system

Basic designUnitole UX is modular in construction, ensuring that any

panel combination and rating can be applied on a system.In addition, there is no limit to the number of panels that can beused in an installation, as several sections can easily be connectedtogether. Because the panels can be quickly assembled andconnected, flexible commissioning of the switchgear is an addedbenefit.

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Fully segregated by earthedmetal partitions, with its ownpressure relief channel into thearc chamber, the compart mentprovides all the safetyinterlocking mechanismsrequired for safe and reliableoperation of the vacuum circuitbreaker. Manual operationbuttons allow for full operationof the vacuum circuit breakerfrom the front of theswitchgear with the door fullyclosed. The circuit breaker ismechanically interlocked withthe compartment door so thatthe door cannot be openeduntil the circuit breaker isswitched Off and racked outinto the Test position.

Vacuum circuit breakercompartment

5

Busbars are totally enclosed intheir own earthed metalcompartment which vents intothe arc chamber. Fully insulatedalong their entire length, thebusbars are type tested forratings up to 4000 A, 50 kA for3 seconds. Epoxy mouldingssegregate switchgear sections.

Busbar compartment4

Individually operated automaticearthed metal shutters for boththe Line (busbar) and Load(cable) connections can bepadlocked in the closedposition. When the breaker is inTest or Disconnect positionsthe shutters automatically closeto prevent accidental contactwith any live parts.

Automatic shutters6

Cast resin CTs are provided asstandard in a wide range ofratings, with an option to uselow voltage tape-wound CTs inthe same location.

Current transformers8

Ample cable terminationprovision is provided up to 9single core cables per phase toenter the bottom of theswitchgear and are terminatedwith compression lugs ontocopper tails provided in thebottom of each panel.

Cable terminations10

An earth bar system is providedmaking connections to thestation earth easy andeffective. The earth bar systemhas been fault tested and runsvertically and horizontally withineach panel section and isconnected to the earth switch,when provided.

Earth bar11

The voltage transformers arefitted with withdrawableprimary fuses to provide fullisolation of the transformer.This arrangement is designedwith maximum user safety inmind.

Voltage transformers9

The earth switch is operatedfrom the front of theswitchgear, with mechanicalindicators to show the switchposition. A window allows directviewing of the earth switchposition. The earth switch ismechanically inter locked withthe circuit breaker or contactortruck such that it can only beclosed when truck is in theTest/Disconnect position. Thecircuit earth switch can bemechanically interlocked withthe cable compartment door asan additional safety measure.

Circuit earth switch7

superior safety, reliability and performance

Clear distinct operator panel for user friendly operation

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Eaton has a range of preferredrelay options that can be fittedas standard. However, customerspecific protection relays fromany manufacturer can be fittedto the compartment door.

Protection relay2

Optional LED indication of earthswitch Open/Closed status.

Earth switch indicator8

The circuit breaker compartmentdoor viewing window providesvisual indication of the positionof the circuit breaker indicating:

• The status of the breaker

• The status of the spring-charged mechanism

The cable compartment doorviewing window allows visualindication of:

• The status of the earth switch

• Inspection of the cableconnections

Viewing windows9Easy to understand mimicdiagram of each circuit.

Mimic diagram3

Breaker Open/Closed statusindicator.

Breaker Open/Closed commandswitch.

Optional LED indication ofspring charge mechanism"Charged" status

Electrical operationwith circuit breakerstatus indicator

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Clear to view panel with allcontrols and indications clearlyvisible and easy to operate.

Low voltage controland protectioncompartment

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Breaker position indicationshows the breaker in theConnected/Service orDisconnected/Test position.

Circuit breakerposition indicator

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Circuit breaker Open and Closebuttons

Manual circuitbreaker operation

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Circuit breaker racking In/Outmechanism

Circuit breakerracking mechanism

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Each circuit breaker panel canbe equipped with an optionalstandard three phase voltagedetection system for voltagedetection to IEC 61243-5. TheVDS is driven from a capacitivedivider fitted within theinsulators connected to thecable connection and showsthe operator if the connectedcable is live.

Voltage detectionsystem

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Option for an ammeter andphase selector switch.

Option for voltmeter and phaseselector switch.

Metering with phaseselector switch

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Control and protection

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Eaton core technologies

Cast-resin is a high-qualityprimary insulation material. By using cast-resin for solidinsulation, Eaton's designengineers can shape the partsspecifically for optimalinsulation, robust constructionand cooling purposes.

With over 50 years ofexperience in the design andmanufacture of cast-resincomponents, Eaton hasdetermined that the bestsolution is to embed theconductors and vacuuminterrupters directly into themoulding to form a singleencapsulated pole unit (EPU).

Features

• High mechanical strength forimproved durability andmechanical life of the poleunit

• Protected against adverseclimatic conditions andhumidity

• Protected againstmechanical impact, shockand vibration

• Provides high thermalconductivity for improvedtemperature rating

• High electrical resistivity andcreepage current resistancefor improved insulation andcompact design

Solid insulation using cast-resin technology

Eaton's vacuum interruptersconsist of a ceramic cylinderthat houses fixed and movablecontacts. Movement of thecontact under vacuumconditions is performed bybellows. A shield surroundingthe contacts prevents theinsulators from becomingcontaminated by any metalvapour produced during currentinterruption. This shield alsoensures good voltage potentialdistribution over the insulator.

A special feature of Eaton'svacuum interrupters is thecreation of a large number ofparallel arcs between thecontacts. This "diffusedischarge" is characterised byvery low arc voltage and short

arc times, resulting in very low arc energy - so contactwear in a vacuum interrupter is negligible.

Vacuum interrupters are main -tenance free and are certifiedup to 30,000 operation cycles.

Vacuum technology: safe, compact and reliable

1. Bellows

2. Bellows shield

3. Ceramic insulators

4. Movable contact

5. Magnetic laminations

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The busbar system is constructed from high-quality hard drawncopper bars of standardised cross-section.

Features

• Busbar compartment runs over the entire length of theswitchboard

• Individual panel segregation between sections of the busbarchamber

• Constructed from high-quality hard-drawn copper of standarddimensions

• Fully insulated over the entire length of the switchboard

• Busbar chamber vents directly into the integral arc-chamber

• Busbar ratings up to 4000 A

• Busbar short circuit ratings up to 50 kA - 3 s

Busbars

The vacuum circuit breaker uses a simple and reliable, true twostep spring charged mechanism for operation of the vacuuminterrupters. The construction of the mechanical linkage betweenthe actuator and the drive rod of each of the three vacuuminterrupters is simple and effective.

Features

• Environmentally friendly vacuum interrupters totally encap -sulated within pole units constructed of solid epoxy resin

• Mechanically and electrically trip-free stored energymechanism design

• Integrated mechanical lever for manual charging operationwith pushbutton control

• Spring charged indicator with contacts for remote indicationof spring status

• Mechanical status indicator for Open/Closed

• Auxiliary contacts for Open/Closed position

• Position indicator for Connected/Test position within thecompartment

• Auxiliary contacts for remote position indication

• Mechanically interlocked with the compartment door

• Mechanical interlock to ensure the breaker is in the openposition before it can be racked-in or racked-out

Main components

Vacuum circuit breaker

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For motor starters, transformers and capacitor banks, the Unitole UXsystem is available with vacuum contactor trucks. Contactors for 3.6 or 7.2 kV can be mounted on a truck together with fuses, andvoltage transformers. Surge arresters can also be mounted at thecable terminals. For motor control applications up to 7.2 kV, UnitoleUX incorporates the Eaton range of SL contactors. For motorstarters at 12 kV please contact Eaton.

Features

• Environmentally friendly vacuum interrupters

• Ratings up to 400 amps at 6.6 kV

• Capacitor switching up to 295 amps at 6.6 kV

• Maximum interruption current of 8.5 kA

• Fuse protected up to 50 kA

• Electronic coil control for optimum control of the coil voltageand reduced watts loss means more efficient use of powerand lower heat generation

• Electronic coil control allows for field selectable controlvoltages and drop out times

• Up to 6 auxiliary contacts in any combination of NormallyOpen and Normally Closed configurations

• Mechanical latch option is available with electrical unlatchsignal.

• Long life with up to 1 million electrical operations and 2.5 million mechanical operations with no maintenance oradjustment required

Contactor

All panels can be equipped with a cable earthing switch. The earthswitch is mechanically interlocked with the circuit breaker so thatthe earth switch can only be operated when the circuit breaker isopen, and withdrawn to the 'Disconnected/Test' position.

Features

• Fully fault-rated earth switch

• Operated from the front of the panel

• Auxiliary contacts for service/earthed positions

• Mechanical position indicators

• Mechanically and/or electrically interlocked with the vacuumcircuit breaker

Earth switch

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Safe and reliable in use

IEC62271-200 describes theextent to which the switchgearand control gear are allowed toremain operational in caseaccess to a main compartmentis necessary.

Unitole UX has the highestattainable level of Loss ofService Continuity of LSC2B.

Category LSC2B

This form allows for maximumcontinuity of service of thesystem during access to thecompartments inside theswitchgear - meaning that themain switching device of eachfunctional unit of an LSC2Bswitchgear is fitted in its ownaccessible compartment.Maintenance may be performedon the main switching devicewithout de-energizing the

corresponding cable connectionor the main busbars. As aconsequence, in this exampleof LSC2B switchgear, aminimum of 3 compartmentsfor each functional unit isnecessary:

• 1 for each main switchingdevice

• 1 for components connectedto one side of a mainswitching device, forexample, feeder circuit

• 1 for components connectedto the other side of the mainswitching device, forexample, busbars

Switchgear is classified asLSC2B when it is possible andsafe to open the circuit breakercompartment when the cableand busbars are energised.

In addition to the IAC and theLSC classifications, IEC62271-200 defines the type ofpartitions required betweeneach panel and between eachfunctional unit within the panel.

Unitole UX employs onlyearthed metal partitions andtherefore has the highest levelof partition classification of PM.

Unitole UX switchgear isequipped with automaticearthed metal shutters.Individually operated shuttersfor both the Line (busbar) and

Load (cable) connections canbe padlocked in the closedposition. When the vacuumcircuit breaker is in the test orthe disconnect positions theshutters will automatically closeto prevent accidental contactwith any live parts. For testingpurposes, special shutter liftersare used to maintain theshutters in the open position.Colour coded and labelled'Busbar' and 'Cable', theshutters are easily identified asOpen or Closed.

Loss of service continuity classification Partition classification

Internal Arc Classification (IAC) of AFLR

While the integrity of theequipment to provide continuityof supply was a major designconsideration throughout itsdevelopment, the safety of theoperator has also been one ofthe most important criteria, witha number of reassuring featuresbuilt in.

All of Eaton's medium voltagesystems, including Unitole UX,have been third party tested toall relevant standards, and are inaccordance with IEC regulations.

Eaton has always emphasisedthe need to design and createsafe switchgear for operators atall times.

One of the biggest potentialthreats to operators is an

internal arc in the switchgear.The metal-clad design and therobust construction has enabledUnitole UX to success fully passinternal arcing test in accor -dance with IEC 62271-200 in allthree primary compart mentsand provides an IAC rating of upto 40 kA for 1 second and 50 kAfor 0.5 second.

IEC62271-200 defines the levelof protection to be provided inthe event of an internal arc faultbeing generated within theswitchgear. Unitole UX has beenproven by independent third-party test to provide an IACClassification of IAC = AFLR.

A = Protection for personnel

F = Protection at the Front ofthe switchgear

L = Protection at the Lateral(sides) of the switchgear

R = Protection at the Rear of theswitchgear

The IEC standard requires thatan internal arc test is carried outin each of the power sections ofthe switchgear. In Unitole UXthis means the cable compart -ment, the vacuum circuitbreaker compartment, and themain busbar compartment.

The standard allows for eachtest to be conducted inindividual switchgear panels -meaning that three separatepanels can be used to prove theintegrity of the design.

Unitole UX, however, hasachieved IEC62271-200 with allthree tests being conducted inthe same panel. It is animportant safety feature andindication of strength thatUnitole UX passed all threerequired tests in the samepanel.

The Unitole UX has thefollowing IAC ratings:

12 kV and 17.5 kV: 25 kA - 1 s, 26.3 kA - 1 s, 31.5 kA - 1 s, 40 kA - 1 s and 50 kA - 0.5 s

24 kV: 25 kA - 1 s

Proven experience and knowledge gained by Eaton

over many years in the areas of cast-resin technology,

vacuum technology, arc interruption and electrical

field control have been integrated in the design and

development of Unitole UX - ensuring that the

switchgear is safe and has high operational reliability

throughout its lifetime.

Unitole UX has an externalprotection degree of IP4X asper IEC 60529 with an option ofIP41 available. Internal ingressprotection to IP2X is standardwith an option for IP3X formore demanding applications.Separation eliminates thepenetration of foreign objectsand reduces the risk ofaccidental contact with any liveparts.

Ingress of foreign objects

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For personnel safety Unitole UX is designed with a number of comprehensive mechanicalinterlocks to prevent unsafe operation.

• It is not possible to rack-in or rack-out a circuitbreaker unless it is in the Off or Open position.

• It is not possible to close a circuit breakerunless the circuit breaker is in the Connectedor Test position.

• The secondary socket can only bedisconnected with the circuit breaker in thetest position.

• Closing the circuit breaker is only possible withthe secondary contacts connected.

• It is not possible to close the earth switchwhen the circuit breaker is in the Connectedposition.

• The door of the vacuum circuit breakercompartment can only be opened when thecircuit beaker is in the Disconnected / Testposition.

• It is only possible to rack-in or rack-out thecircuit breaker when the circuit breaker door isclosed.

Safety interlocks

In addition to the third partycertified type testingprogramme to prove theintegrity of the Unitole UXdesign, Eaton conducts routinetests on each vacuuminterrupter, circuit breaker andswitchgear panel. At aminimum these tests confirmcompliance with the relevantIEC standards; howevercustomer specific testprocedures and witness oftests can be accommodated.To ensure quality, all processesare performed in accordancewith ISO 9001 - at every stageof production the components,circuit breakers and currenttransformers are inspected forcorrect functioning. When theentire installation has beenassembled, a thorough visualinspection is carried out,together with the requiredmechanical, functional andelectrical checks.

Routine tests

IEC62271-200 defines theaccessibility classification foreach of the power sections inthe switchgear. Uniltole UX hasthe following accessibilitydefinitions.

• Busbar: tool-based/non-accessible

• Circuit breaker: interlocked controlled

• Cable: tool-based or option forinterlocked controlled

Accessibility of

compartments

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The Unitole UX is designed

to be environmentally

friendly throughout the

life-cycle: from production,

during service and at the

end-of-life.

One of Eaton's key strategicinitiatives is to provideenvironmentally friendlyproducts. This requiresexamination of the total life-cycle, from design todecommissioning.

The product life-cycle can bedivided into five main blocks.These blocks are

• The design

• Materials used

• The assembly

• The operational phase

• The decommissioning

Eaton's production plants actentirely in accordance with therules and procedures of the ISO 14001 environmentalcertificate during developmentand production processes.

Environmentally friendly

Sustainability

Material selection and thenumber of parts that are usedto manufacture the Unitole UXare critical to determining howenvironmentally friendly themanufacturing process is.

Eaton selects its materials toensure that they have the

lowest possible impact on theenvironment. It is essential thatthey are equally safe for people- not just during use, but at theend of service life too.

Within Unitole UX and the W-VACi circuit breaker, acombination of solid (cast-resin)

and air is used as insulation.The cast-resin technology, incombination with electrical fieldcalculations, provides a verycompact, environmentallyfriendly design for the circuitbreaker and the switchgear.Because the switching medium

- vacuum - is used, Unitole UXcan be completely recycled atthe end of its life without anyissues relating to safetyprocedures, special handling orsafe disposal.

Environmentally friendly design

From the very beginning Eatonmade a fundamental choice notto use SF6 as a switching andinsulation medium for mediumvoltage equipment - it is on thelist of greenhouse gasses in theKyoto protocol and is the mostpotent of the six maingreenhouse gasses, with aGlobal Warming Potential(GWP) of 23,000.

Some medium voltageswitchgear systems use SF6 gas as the insulatingmedium. Leakage of SF6 gasfrom switchgear contributessignificantly to the threat of thegreenhouse effect andassociated climate change.They also require additionalsafety measures and specialhandling requirements at theend of life.

No use of SF6-gas for insulation or switching

Unitole UX is produced in anenergy efficient environment.Standard processes andmaterials are used in the designand require no special handlingor manufacturing processes,thus reducing the amount ofenergy required to manufactureand assemble the switchgear.

Energy efficient assembly

Besides the energy sources,special focus is placed on theefficient use of material duringassembly. For example by usingadvanced nesting tools thesheet steel plates are cut withthe least amount of waste, andsimilar principles are followed inthe design and manufacture ofother product components.

Efficient use of materials

Unitole UX is designed for alifetime of at least 30 years;therefore the energy usage formaintenance activities duringthis long period is minimal. Dueto the green insulation andswitching technology, there isalso no leakage of the harmfulSF6 gas during its lifetime andno need for performing extramaintenance activities on SF6gas pressure checks.

Minimum service checks

on site

All materials within Unitole UXcan be re-used or recycled.Because the Unitole UX usesno SF6 gas, there is nopossibility of leakage of thisgreenhouse gas duringdecommissioning theswitchgear.

Re-use or recycling of

materials

The number of electricalcontact or changeover pointswithin the Unitole UX systemhas been kept to an absoluteminimum. This reduces thepotential number of "hot spots"and prevents additional energyloss associated with contactsurfaces.

Minimal energy loss

during operation

Low total cost ofownership

Designed to provide at least 30 years of reliable service

the Unitole design guarantees low overall cost of

ownership when considered over the lifetime of the

switchgear.

Life-time costs can be split into initial costs, costs incurred duringservice and finally, costs for disposal of the switchgear. All costsof ownership are influenced by different features of theswitchgear provided with no concession to quality and reliability.

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Panel dimensions

With panel dimensions of 600 mm, 800 mm and 1000 mm with only 3 depths of panel across all ratings of1320 mm, 1500 mm and 1550 mm, Unitole UX is one ofthe most compact designs ofair insulated medium voltageswitchgear available today. Thecompact design of Unitole UXallows for smaller switchroomsto be build further reducing theoverall cost of installation.

Flexible cable access

The Unitole UX offers top andbottom cable entry with cableaccess from either front or rear.If front access is chosen it ispossible to mount the UnitoleUX panels flush against thewall thus reducing further thespace needed in the building.

Low initial costs

Unitole UX switchgear has atypical lifetime of at least 30years. Depending on thelocation of the installation, thislifetime can be extended. If, forany reason, a decision is madenot to use the switchgear anyfurther it can be fully recycled.

When decommissioned, theswitchgear can be dismantledand the different materials caneither be re-used or recycledwith total safety. Because noSF6 gas is used, decommis -sioning is a less complicated,more cost effective and anenvironmentally friendlyoperation. There are no specialprecautions, tools ordecommissioning methodsrequired.

Low disposal cost

Costs during service ofswitchgear can accumulate dueto damaged parts requiringreplacement, or by maintenancecycles set up for critical partsthat will not reach theirexpected lifetime without beingserviced.

Keeping this in mind during theinitial design of the Unitole UX,the first design stepsundertaken were to:

• Minimise the number ofparts used in theconstruction

• Design using industrystandard or readily availableraw materials

• Prevent internal parts frombeing damaged during thelifetime of the unit.

This robust construction, usingonly the minimum number ofparts, is based on our longexperience of buildingswitchgear. During productionof the panels, routine tests arecarried out by specialists, toensure that the panels achievethe quality that they aredesigned for.

Low cost during service

By designing a simple, modular,efficient, proven, low energyspring charged mechanismwith the fewest possiblenumber of parts for the vacuumcircuit breaker, the maintenancerequirements normallyassociated with this type ofmechanism is dramaticallyreduced.

With proven reliability of up to20,000 operations the UniversalMechanism Assembly used inthe W-VACi breaker helps toprovide a virtually maintenance-free circuit breaker.

Vacuum interrupter designplays an important role in thereduction of maintenance.Eaton's vacuum interruptersemploy a 'diffuse discharge'design which practicallyeliminates contact wear.Coupled with the proven solidinsulation technology Eatonemploys in the manufacture ofthe encapsulated pole unit, theW-VACi range of vacuum circuitbreakers is considered virtuallymaintenance free.

Switchgear that uses SF6 gasas an insulation medium has aninherent leakage rate. Tomaintain an adequate insulationlevel within this type ofswitchgear, the pressure of theSF6 gas present in theswitchgear tanks must bechecked and refilled on aregular basis during the unit'slifetime.

With Unitole UX the extra costsinvolved in checking andmaintaining the requiredinsulation level are not incurred.The combination of vacuuminterrupters for switching, cast-resin technology and clean airas the insulation medium, isenvironmentally friendly andmaintains the same qualitylevel during the completelifetime of Unitole UX. By notusing SF6 gas in Unitole UX, anowner is also not faced withthe administration costsinvolved in registering thenumber of kilograms of SF6 gasin the installation.

Minimal inspection

16

Standards

Unitole UX complies with the following international standards

IEC 62271-1 Common specificationsIEC 62271-100 Circuit breakers (E2, M2, C2)IEC 62271-102 Disconnectors and earthing switches (E2, M0)IEC 62271-200 Metal enclosed switchgear and controlgearIEC 60044-1 Current transformersIEC 60044-2 Voltage transformersIEC 60529 Degrees of protection (IP Code)IEC 61850 Communication networks and systems in substationsIEC 61243-5 Live working - voltage detectors - Part 5: voltage detecting systems

Flexibility in design

Every application of this

type of system is unique,

so Eaton offers a wide

range of different panel

types and field versions.

If, in due course, additionalcapacity in the form of morepanels is required, Unitole UXcan easily be extended to theright or left with only minimaldisruption to the supply forfinal connection of the busbars.

Eaton realises that customersoften have their ownrequirements with respect tothe use of protection andcontrol components withinswitchgear, so the need forspecific components was takeninto account during productdevelopment and resulted in abasic primary design thatenables customers to integratesecondary protection andcontrol components accordingto their own specificationrequirements.

Range of voltagetransformers

All Unitole UX panels can befitted with cast-resin insulatedvoltage transformers, of therequested transformer ratioand class, for voltagemeasurement on the cableside, or on the busbar side.

The standard configuration isfor a fixed voltage transformerwith withdrawable fuses -although an option for truckmounted withdrawable voltagetransformers is also available.

Range of currenttransformers

In order to provide protectionand metering, the cast-resininsulated current transformersare housed in the fixed sectionnear the feeder cable terminals.All common transformer ratios,outputs, rated currents andclasses are possible. For highercurrent ratings above 2500 Acast-resin ring-type currenttransformers are used.

It is also possible, as an option,to fit low voltages wire-woundcurrent transformers onto ascreened primary conductorinstead of the standard cast-resin block or ring typetransformers.

Smart Grids and substationautomation

Equipment for remotecommunication betweenpanels or automation systemscan also be installed in the lowvoltage compartment, makingthe system the perfect solutionfor current and future SmartGrid applications.

Protection and controlequipment

The protection and controlequipment is located in acompletely separate lowvoltage compartment with itsown access door. There isspace on the door for a mimicdiagram and for mountingequipment such as protectionrelays, voltage detectionsystems, meters, etc.

In case additional space isrequired, the low voltagecompartment can be extended.

17

Electrical Data

System 12 kV 17.5 kV 24 kV

Rated voltage kV 12 17.5 24Lightning impulse withstand voltage kV 75 95 125Power frequency withstand voltage kV 28 38 50Rated frequency Hz 50/60 50/60 50/60Internal arc class AFLRLoss of service continuity category LSC2BPartition class PMEarthing circuit kA - s 25 - 3; 26.3 - 3; 31.5 - 3; 40 - 3; 50 - 1 20 - 3; 25 - 3

Accessibility of compartments

Circuit breaker compartment Interlock-controlledBusbar compartment Tool-based/non-accessibleCable compartment Tool-based or Interlock-controlledExternal degree of protection IP4X (IP41 as an option)Internal degree of protection IP2X (IP3X as an option)Installation IndoorTemperature classification °C -5 to +40Relative humidity (max) % 95

Busbar system

Rated normal current A 1250, 1600, 2000, 2500, 3150, 4000 (FC*) 1250, 2000, 2500Rated short-time withstand current kA - 3 s 25 / 26.3 / 31.5 / 40 / 50 20 / 25Rated peak withstand current kA/50 Hz 63 / 66 / 80 / 100 / 125 63 / 80

kA/60 Hz 65 / / 82 / 104 / 130 65 / 82

*) FC = Fan cooled.

Circuit breaker ratings

Rated normal current A 630, 1250, 2000, 2500, 3150, 4000 800, 1250, 2000, 2500Rated short-circuit breaking current kA 26.3 / 31.5 / 40 / 50 20 / 25Rated short-circuit making current kA 65 / 82 / 104 / 130 65 / 82Rated short-time withstand current kA - 3 s 26.3 / 31.5 / 40 / 50 20 / 25Single capacitor bank switching C2 A 400Multiple capacitor bank switching back to back C1 A 400Class S1, E2, C1, C2Operating cycles at short-circuit current 100Auxiliary voltage V 110/120/127 Vac 50/60Hz,

208/220/240 Vac 50/60Hz, 24/48/60 Vdc,

110/125 Vdc, 220/250 Vdc

Mechanism

Rated operating sequence A O - 0.3s - CO - 15s - COO - 0.3s - CO - 180s - CO

Class M2Number of operations up to 20,000Number of operations interrupter up to 20,000

600 800 1000

AB

18

Dimensions

Panel width 600 mm 800 mm 1000 mm

12 kV and 17.5 kV

Max. rating 630 A / 1250 A 2000 A 3150 A / 4000 A (FC)

Depth 1320 1320 / 1500* 1500Height (A) 2200 2200 2200Height including arc chamber (B) 2750 2750 2750

24 kV

Max. rating 800 A / 1250 A 2000 A / 2500 A

Depth 1550 1550Height (A) 2320 2320Height including arc chamber (B) 2870 2870

*) 1500 mm for IAC classification ratings of 40 kA - 1 s and 50 kA - 0.5 s only.

The Unitole UX product

range is very flexible and

has a variety of circuit

options that enable almost

all types of application to

be configured.

The truck design is common forall the types enabling thereconfiguration of the panelwhile in service.

For added configurationflexibility the Riser Panels canbe fitted on either the left orthe right side of theSectionaliser Panels. Also thewidth of the combination of

Sectionaliser and Riser Panelsis kept to a minimum.

Further flexibility is provided bythe Equipped Riser Paneloption. In this configuration anystandard equipment truck canbe fitted into the EquippedRiser, offering options forbusbar metering, earthing, anda disconnect truck.

A wide range of additionaloptions are also available formounting within the mainprimary compartments. Thelow voltage control andprotection compartment alsooffers many options for controland indication.

Product range

Panel configurations

Cell Cell

VCB Panel

Cell

Contactor Panel Sectionaliser Panel

Cell

Metering PanelWithdrawable

Cell

Busbar VT Panel

Cicuit Breaker Contactor

WithdrawableTruck VT

WithdrawableVT

Fixed VTWithdrawable Fuses

Cell

Cell

Sectionaliser PanelRiser Panel Left Riser Panel Right

Cell

Busbar Earthing

Cell

Disconnector CT

Cell

VT withFeed Through

Cell

Cell

Cell

Cable Earthing

Cell

Cell

Sectionaliser Panel

Cell

Sectionaliser Panel

Cell

Equipped Riser Left

Cell

Equipped Riser Right

Truck configurations

19

Eaton Electric B.V.P.O. Box 237550 AA HengeloThe Netherlands

Tel.: +31 (0)74 - 246 40 10Fax: +31 (0)74 - 246 40 25holec-info@eaton.comwww.eatonelectric.com

© 2010 Eaton Electric B.V.All rights reserved.

Form No. PG02200001U/SGOctober 2010

The information provided in this documentreflects the general characteristics of thereferenced products at the time of issue andmay not reflect their future characteristics.Eaton Corporation reserves the right tomodify the contents of this document andthe characteristics of the referencedproducts without prior notification. Eaton Corporation does not assume liabilityfor potential errors or omission of information in this document.

Eaton's Electrical Sector is aglobal leader in powerdistribution, power quality,control and automation, andmonitoring products. Whencombined with Eaton's full-scaleengineering services, theseproducts provide customer-driven PowerChain® solutionsto serve the power systemneeds of the data center,industrial, institutional, publicsector, utility, commercial,residential, IT, mission critical,

alternative energy and OEMmarkets worldwide.PowerChain Managementsolutions help enterprisesachieve sustainable andcompetitive advantages throughproactive management of thepower system as a strategic,integrated asset throughout itslife cycle, resulting in enhancedsafety, greater reliability andenergy efficiency. For more information, visitwww.eaton.com/electrical.

PowerChain® solutions helpenterprises achieve sustainableand competitive advantagesthrough proactive managementof the power system as astrategic, integrated assetthroughout its life cycle,resulting in enhanced safety,greater reliability and energyefficiency. For more information, visitwww.eaton.com/electrical.

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