s
Wind power
3WL air circuit breaker
Effective protection of the main circuit
Answers for industry.
Safe disconnection
during maintenance
Locking devices for 3WL
air circuit breakers prevent
unintentional operation
and provide reliable protection for personnel
during both operation
and maintenance.
Highlights
Reliableprotectionofmaintenancepersonnelagainstunauthorizedreconnectionby
meansofalockingdevice
CompliancewithsafetyrequirementsformaintenancepersonnelaccordingtoIEC60947-2
Optionalretrofittingalsoto
existingsystems
Unauthorizedconnectionof3WLaircircuitbreakercanbepreventedeasilyandatlowcostwith
uptofourpadlocks.
Safe disconnection
Safe OFF according
to IEC 60947-2
Protection by means of
a locking device
Unauthorizedconnectionofthe3WLaircircuitbreakercanbepreventede.g.withanintegrated
key-operatedswitch.
Safe disconnection during
maintenance
3WLaircircuitbreakersarealsousedforsafedisconnectionfromthenetworkand
generatorduringmaintenancework.Numerouslockingoptionsensureoptimum
protectionformaintenancepersonnel.
Itisparticularlyimportantforsafetyduringmaintenanceworktoestablish“Safe
OFF”status.Thispreventsunauthorizedconnectionnotonlydirectlyatthe3WL
aircircuitbreakerbutalsobymeansofremoteswitching.Thisfunctioncannotbe
bypassed.Lockingisperformedbymeansofeitherakey-operatedswitchthatis
integratedintheoperatorpanelorafastenerthatcanbesecuredwithupto4
padlocks.
Safe disconnection
Bothlockingdevicesareoptionalandcanalsoberetrofitted.Thisfunctioncomplies
withconditionsforswitchdisconnectorsaccordingtoIEC60947-2inOFFposition.
Certification according
to GL Guideline 2010
With a certificate based
on Germanischer Lloyd
Guideline 2010, developers and manufacturers
are able to perform the
type certification of a
wind turbine through
simple integration of
previously certified parts
and system components.
Highlights
Compliancewiththehighest
safetystandardofGL2010
Highsystemavailabilitythanks
toaredundanttrippedsignal
Canberetrofittedalsoto
existingsystems
GL 2010 certification
New safety
standard
Redundant tripped
signal
Metering
Converter
G
Generator
Grid
Controlroom
Trippedsignal
Atrippedsignalissentsimultaneouslytotheconverterandthecontrolroom.
Certification according
to GL Guideline 2010
CertificationaccordingtoGLGuideline2010ensuresthatpartsandsystemcomponents
alwaysmeetalltherequirementsregardingsafety,functionandproductionqualitythat
areindispensableforwindturbinesandtheirspecialapplicationinharshambient
conditions.
Thestandardprovidesforaredundantscanandtheforwardingofsystem-relevant
information.Forcircuitbreakersinthemaincircuitthismeansforexamplethatthere
mustbearedundantoutputofthetrippedsignal.
GL 2010 certification
Siemensoffersaversionofthe3WLaircircuitbreakerwhichisequippedwithasecond
trippedsignalingswitchandisthereforeincompliancewiththestandard.Thetripped
signalingswitchcanalsobeorderedseparatelyforretrofittingatanytime.Theredundantforwardingofthetrippedsignaltothecontrolsystemofthewindturbineandthe
windturbinecontrolroomincreasesthesystem’ssafetyandavailability.
Safe also with
harmonics
Harmonics are sinusoidal
oscillations whose frequencies are superimposed on
the 50 Hz base frequency
of the network. They constitute an additional load
on all the electrical components of wind turbines
and jeopardize their safe
operation.
Highlights
Hightrippingreliabilityfor
optimumsystemprotection
Preventionoffalsetrippingsby
filteringoutinducedcurrent
andvoltagepeaks
Highmeasuringaccuracyfor
optimumsystemtransparency
TheEMCfilterensurestheprotectionandmeasurementfunctionofthe3WLaircircuitbreaker.
High tripping reliability
Protection due to high
tripping reliability
Protection and measuring
reliability
3WLaircircuitbreaker
Converter
Undamped
harmonicsin
themaincircuit
A
EMCfilter
Measuring
andprotectioncircuit
ETU
Maincircuit
50Hzsinusoidalgrid
inthemeasuringand
protectioncircuit
Operationofthe3WLaircircuitbreakerisassuredbyfilteringouttheharmonicsinthemeasuringcircuit.
Safe also with
harmonics
Networkanalyseswithinthewindturbinerevealthatconverterscangeneratehighlevels
ofharmonics.Theseharmonicscancausephysicallyinducedvoltageandcurrentpeaks
whichinturncanresultinmalfunctionsandeventhefailureofelectroniccomponents.
Duetothedesignofcircuitbreakers,theinductionofhigh-frequencysignalsoninternal
conductorscanleadtothecorruptionofcurrentmeasuringsincircuitbreakers.When
designingthe3WLaircircuitbreaker,itsoperationwithconverterswastakenintoaccount
inordertomakeitasinsensitiveaspossibletohigh-frequencyfaults.However,experience
showsthatthehighdemandsinawindturbinerequireextendedprotectionforelectronic
componentsagainstharmonics.AnoptionalEMCfilterreliablyfiltersouttheseharmonics
andincreasesthereliabilityofthecircuitbreaker.Inaddition,uncorruptedmeasuringsignals
leadtogreatersystemtransparencyandthereforetoahigherlevelofsafetyfortheentire
windturbine.
High tripping reliability
TheEMCfilterisalsoavailableforretrofitting.
Protection against
ground faults
A ground fault is a conducting connection of a
conductor to ground or
grounded parts. The
resulting ground-fault
current can initiate a
short circuit, endanger
people or even cause a
fire in the system.
Highlights
Enhancedfireprotectionalso
whengroundfaultsoccur
Preventionofseriousconsequentialdamagethanksto
ground-faultprotection
Canberetrofittedalsoto
existingsystems
Extendable protection
function
ETU
Themodularelectronictripunitcanbeupgradedwithaground-faultmodule.
Enhanced fire protection
Ground-fault module
Ground-faultmodule
Alarm signal or
direct disconnection
3WLaircircuitbreaker
Maincircuit
Converter
A
ETUwithgroundfaultmodule
Controlroom
Alarmsignal
Measuringandsignalingofgroundfaultsbytheground-faultmodule.
Protection against
ground faults
Enhanced fire protection
Optionalground-faultprotectionmodulesareavailablefortheETU45BandETU76Bmodular
electronictripunitsofthe3WLaircircuitbreaker.Theyprotectelectricalsystemsagainst
unacceptablyhighgroundfaultcurrents.Theovershootingofanadjustablethresholdvalue
willleadtoasignalbeingforwardedfornotificationofthewindturbinemanagementor,
dependingontheconfiguration,alsoforsimultaneoustriggeringofthe3WLaircircuit
breaker.Localorremoteparameterizationispossibledependingonthemodule.
Quick status
assessment
Demand-oriented maintenance and inspection
assure the reliable operation of the 3WL air circuit
breaker. Simple diagnostic
functions and visual inspections provide a quick
overview of the circuit
breaker status and therefore make planning and
maintenance easier.
Highlights
Lessinspectionworkthanksto
easystatusassessment
Integrationinaremotediagnosticsconceptforpreventivemaintenancepreventsconsequential
defects
Lowermaintenancecoststhanks
tolow-maintenancedesign
Easy testing of
contacts
Replacecontacts
Replace
contacts
Easyvisualinspectionofcontactsandthearcchamber.
Quick status assessment
ContactsOK
Contacts
OK
Preventive maintenance
by signaling
CubicleBUS
Maintenanceanddiagnosticsdata
Controlroom
Maintenanceanddiagnosticsdataaredisplayeddirectlyatthe3WLaircircuitbreakerandforwardedto
thewindturbinecontrolroom.
Quick status
assessment
Thecircuitbreakerplaysanimportantprotectionfunctioninthewindturbineandatthesame
timeisexposedtohighstress.Inspectionsmustbecarriedoutafterdefinedincidents,e.g.after
heavy-dutydisconnections(overloads/shortcircuits).Thestatusofthecontactsandthearc
chambersareeasilycheckedbyvisualinspection.
Preventivemaintenanceispossiblebycheckingtheoperatingcyclescounterorthemaintenance
anddiagnosticsdataviathecommunicationinterface.Thisincreasesthesystem’savailabilityand
safetywhileloweringtheoperatingcoststhroughpreventionofpotentialconsequentialdefects.
Quick status assessment
Thankstothelow-maintenancedesign,thereisnoneedtoapplyanymoregreaseoroil.
Simplified inspection
and maintenance
The withdrawable design
of the 3WL air circuit
breaker enables easy
maintenance and fast
replacement of the
devices. Standstill times
are reduced as a result.
Highlights
Reducedstandstilltimesfor
servicingthankstolessmaintenanceworkwiththewith-
drawableversion
Optimumpersonalsafetyduring
maintenanceworkthroughthe
disconnectionoflivesystem
components
Easyretrofittingalsoforexisting
systems
The3WLaircircuitbreakeriseasytoremovewiththehelpoftheintegratedhandle.
Easy inspection and maintenance
User-friendly withdrawable design
Shutter for touch
protection
Closedshutter
Openshutter
Livecontactsarecoveredbytheshutterandopenedwhenthe3WLaircircuitbreakerispushedin.
Simplified inspection
and maintenance
The3WLaircircuitbreakercanberemovedfromtheguideframewiththehelpoftheintegrated
andcaptivehandle.Thisuser-friendlywithdrawabledesignreducesthecostsofinspectionand
maintenancebyconsiderablyreducingthetimerequiredforinstallationandremoval.
Beingabletoremovethecircuitbreakerfromtheguideframewithoutdisconnectingthemain
conductorconnectionsofthecontrolcabinet/convertermakesiteasytocheckthestatusofthe
circuitbreaker,particularlythatofthearcchambersandswitchingcontacts,andtoreplaceany
parts.Forcertaininspectionjobs,e.g.visualinspectionsaftercontacterosionorofthearcchamber,
thereisnotevenanyneedtoremovethedevicecompletelyfromtheguideframe.
Thewithdrawablesolutioncanalsoberetrofittedtoexistingsystemswithoutanychangeofheight
andwidthinthespaceconditions.
Easy inspection and maintenance
Thelivecontactsintheguideframecanbereliablycoveredwithanoptionalshutterinorderto
providemaintenancepersonnelwithadditionaltouchprotectionagainstelectricshock.
Optimum availability
through communication
The digital, configurable
CubicleBUS output module
is used to forward important operating parameters
of the 3WL air circuit
breaker to the communication system of the wind
turbine. This increases
system transparency.
Highlights
Increaseofsystemtransparency
throughcommunicationcapa-
bility
Earlyinterventionprevents
majorconsequentialdamage
Flexiblecommunicationconnectionusingvariouscommunicationstandards
Communicationofimportantoperatingparameterstothecommunicationsystemofthewindturbine.
Flexible communication
Greater system
transparency
Flexible
communication
PROFINET
DigitalI/O
PROFIBUS/Modbus
CubicleBUS
Forwardingofswitchingstatesandsystemstatestoahigher-levelmanagementsystem.
Optimum availability
through communication
Thedigital,configurableCubicleBUSoutputmodulecanbeputtoflexibleuse.Ithasseveraloutputs
assignablewithdifferentincidents:
–
–
–
–
Statussignals,e.g.ready-to-closestatus;operatingposition
Alarmsignals,e.g.limitvalueviolation
Trippedsignals,e.g.causeoftripping
Signalsforthresholdvalueviolations
Flexible communication
Theseincidentscanbeintegratedintheprocesscontrolsystemofthewindturbineandprovideearly
notificationofimminentoverloadsordefectsinthemaincircuit.ThedatacanbeforwardedviaPROFIBUS,
ModbusorEthernet.ConnectiontoPROFINETisalsopossibleviacorrespondinginterfaces.Systemtransparencyisincreasedastheresult,andwithitsystemavailability.
High performance
in little space
Conditions are tight in
wind turbines. The 3WL
air circuit breaker is
excellently suited for
such requirements
thanks to its small size
and low weight.
Highlights
Majorcostadvantagesthrough
compactdesign
Highvoltagetolerancemeets
wind-specificrequirements
Lessspacerequiredinthe
controlcabinetthankstosmall
size
The3WLaircircuitbreakerisidealforthetightspaceconditionsinthecontrolcabinet.
Low space requirement
Compact size
and low weight
Ideal for confined
space conditions
Competitors
Siemens
2,000A
2,000A
4,000A
SizeI
SizeII
3WLaircircuitbreakersrequireverylittlespace.
4,000A
SizeIII
High performance
in little space
Intheperformanceclasses2,000A(size1)and4,000A(size2),the3WLaircircuitbreakerranksamong
themostcompactandthereforesmallestaircircuitbreakersonthemarket.Bothversionsmeetwindturbine
requirementsfor690Vwithavoltagetoleranceofupto+20%,andbothhaveahighswitchingcapacity.
Low space requirement
Thecombinationofhighperformanceandcompactdimensionsbringsconsiderablecostadvantages:
– Lessspacerequiredinthecontrolcabinet/converter
– Lessweightactingonthewindturbinestructure
– Betterpricepositioncomparedtodeviceswithidenticalperformancebutlargerdesigns
Yourcontact
forthissubject:
Frank Scheunert
Fon: +49402889-2343
Mobil: +491723076068
Mail: frank.scheunert@siemens.com
SiemensAG
SektorInfrastructure&Cities
LowandMediumVoltageDivision
LowVoltage&Products
P.O.Box100953
93009Regensburg
Germany
Orderno.E10003-E38-4B-R0030-7600
Dispo25600•0514•0.3
PrintedinGermany
Subjecttochange.
Theinformationprovidedinthisbrochurecontains
descriptionsorcharacteristicsofperformancewhichin
caseofactualusedonotalwaysapplyasdescribedor
whichmaychangeasaresultoffurtherdevelopment
oftheproducts.Anobligationtoprovidetherespective
characteristicsshallonlyexistifexpresslyagreedinthe
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www.siemens.com/lowvoltage/wind-power