Type 8BK20 Switchgear up to 24 kV with …

1 Type 8BK20 Switchgear up to 24 kVwith withdrawable circuit -BreakerssMedium-VoltageSwitchgea rCatalog HA : Catalog HA 1995 Type 8BK20 Switchgear up to 24 kV with WithdrawableCircuit-BreakersAir-Insulate d, Metal-Enclosed, Metal-CladSingle/Duplicate Busbar Siemens AG 1999 Medium-Voltage SwitchgearCatalog HA 1999 Application, FeaturesTypical uses2 Personnel safety,Equipment reliability, operation2 to 4 Technical DataElectrical data, dimensions5 and 6 Installation details6 and 7 Shipping details8 Product RangeSingle busbar panels9 to 11 Duplicate busbar panels12 Electrical DesignBasic panel design13 Mechanical DesignHigh-voltage section14 to 18 Low-voltage section19 StandardsStandards, specifications,guidelines20 to 22 AppendixCatalog index23 Conditions of sale and delivery,24export regulations, trademarks, dimensionsContents1 Type 8BK20 Switchgear up to 24 kV with withdrawable circuit -BreakersApplicationFeatures8BK20 Switchgear with withdrawable circuit -breakersfor indoor installation is suitable for: Rated voltages from kV to 24 kV Rated short- circuit breaking currents from kA to 50 kA Rated busbar normal currentsup to 4000 A Rated feeder normal currents up to 4000 ATypical uses Power stations, transformer stations and switchingsubstations of public utilities Cement industry Automotive industry Iron and steelworks Rolling mills Mines Food and fiber industry Chemical industry Mineral oil industry Pipelines Offshore installations Electrochemicals Petrochemicals Railway power supplies Shipbuilding Diesel power stations Emergency power suppliesPersonnel safetySwitching operations withdoor closedPersonnel safety is increasedby.

2 Opening and closing of theswitching device In the disconnected orconnected position Mechanically or electrically with the door closed Isolation by moving thewithdrawable part, manuallyor motorized, with the doorclosed Verification of safe isolationfrom supply. According toVDE 0105, Part 1, there arethree alternative methods: Closing of a make-proofearthing switch with the doorclosed Pole-by-pole testing with acapacitive voltage detectorwith the door closed Testing with conventionalvoltage testers to VDE 0681,Part 4, but with the dooropen Opening and closing of themake-proof earthing switchwith the door closed On the feeder and on thebusbar: manuallyInterlocking of door/ withdrawable partThe door is incorporated in theinterlocking concept as follows: Opening is possible onlywhen the withdrawable partis locked in the disconnectedposition. The withdrawable part can bemoved from the disconnect-ed to the service positiononly when the door is closedR-HA25-286 eps2 Siemens HA 19991 Type 8BK20 Switchgear up to 24 kV with WithdrawableCircuit-BreakersSiemens HA 1999 3 FeaturesPersonnel safetyProtection against electricshock and ingress of solidforeign bodies8BK20 Switchgear providesboth external and internalprotection.

3 External protection isprovided by Complete enclosure of thepanels in all operating states Internal protection isprovided by Internal metal compart-mentalization with enforced-operation shutters, optionalarc-resistant version of thebusbar compartment The inter-cubicle partitions;optional arc-resistant version Degree of protectionStandard version IP4 degrees of protection,such as IP31D, IP50 andIP51, can be obtained byadditional sheet-steelenclosure or compart-mentalization8BK20 Switchgear has beentested in accordance with the relevant standards forresistance to accidental arcingto ensure: External protection(personnel safety) Optional resistance tointernal arcing (exceeding the scope of the standards), the effects of an arc arelimited as follows: Pressure-proof in relation toneighboring panels Pressure-proof from thewithdrawable part or theconnection compartment to the busbar compartment(applicable to rated currentsup to 2500 A only) Pressure-proof from thebusbar compartment to thewithdrawable part or connec-tion compartment (applicableto rated currents up to 2500 A only) Pressure switch Limits arc duration to amaximum of 100 ms Minimizes the damage andeffects of an arc Recommended use withgrading times > s A function check of thepressure switch is possiblewithout interruptingoperation Triggers the feeder circuit - breaker if the pressureswitch respondsSwitchgear interlockingAll interlocks are mechanicalwith preventive, key-operatedaccess shutters.

4 Operating levers can only beinserted when the inter-locking conditions are fulfilled This prevents impermissibleoverstraining of the interlock-ing mechanismsElectric strengthAdequate electric strength of8BK20 Switchgear is assuredby: Sufficiently large air gapsbetween phases and to earth Suitable electrode formThese design features allow all conductor insulation to bedispensed with level ofindependence of climate and environmentThis is provided by: Ribbed insulators in castresin, with high resistance to pollution Total enclosure under alloperating conditionsMaintenanceMinimum maintenanceeffort is assured by: Total enclosure under alloperating conditions Use of proven, mainte-nance-free vacuumswitching devicesAvailabilityEasy procurement of partsfor extensions and repairsthrough the use of: Standard insulators Standard instrumenttransformers Standard vacuumswitching devices Standard copper sections Detachable low-voltagecompartment up to 15 kVwith plug-in connectiontechnologyEquipment reliability8BK20 Switchgear withwithdrawable circuit -breakers1)Additional interlocks that exceed the scope of VDE 0670 Part 6 or IEC 60 8BK20 Switchgear up to 24 kV with withdrawable circuit -Breakers4 Siemens HA 1999 OperationMoving a withdrawable partinside a panelLittle effort is required by handor motor to move a with -drawable part inside a panelwith the aid of: A spindle mechanism Ball-bearing rollersMoving a withdrawable partoutside a panelA withdrawable part is light andeasy to move outside a panel.

5 with a central service truck(see also adjacent figures) By one man Without tools Regardless of floor surfaceSequence for moving thewithdrawable part Move the withdrawable partinto the disconnectedposition Open the door Unplug the low-voltageconnector Unlock the withdrawable part(unintentional removal of thewithdrawable part is prevent-ed by an additional interlock) Bring up the central servicetruck and lock it onto thepanel (additional interlock isthen overridden) Pull out the withdrawablepart onto the truck as far as it will go (it cannot fall) Detach the central servicetruck and the withdrawablepart from the panelRemote controlElectric remote control, a central control room,can be provided for thefollowing functions: Moving a motorizedwithdrawable part into thedisconnected or connectedposition Opening and closing of theswitching deviceLocal manual operation isalways service truck formoving the withdrawablepart withdrawable part can belowered to the floor Collapsible for space-savingstorage withdrawable part locksautomatically onto the trunk Lifting arms can be crankedup to maximum heights 1200 mm for kVinstallations 1430 mm for kVinstallations Large, swiveling wheels Suitable for all withdrawablepartsVerification of safe isolationfrom supplyWith a voltage detector con-forming to the LRM system(Low Resistance Modified) to E VDE 0682 Part 415.

6 Pole-by-pole verification ofsafe isolation from supply Detector suitable forcontinuous operation Safe to touch Routine-tested Measuring system andvoltage detector can betested Voltage detector flasheswhen high voltage is appliedInterlocking conditionsThe following operations canbe carried out as soon as thefollowing standard interlockingconditions have been met: Moving the withdrawablepart from the disconnectedto the connected position: Low-voltage connectorplugged in High-voltage door closed 1) circuit - breaker in the OPEN position Make-proof earthing switchin the OPEN position 1) Moving the withdrawablepart from the connected tothe disconnected position: circuit - breaker in the OPEN position Operating the circuit - breaker : withdrawable part in theinterlocked end position Operating the make-proofearthing switch: withdrawable part in theinterlocked disconnectedposition 1) Opening the high-voltagedoor.

7 withdrawable part in theinterlocked disconnectedposition 1)HA25-2491a eps-C1-C2 ULE-HL1L2L3R-HA25-284 epsR-HA25-285 epsReady to useCollapsedCentral service truckVerification of safeisolation from supplyLegend C1 Capacitor integrated in current transformer or in post insulator C2 Capacitor of the connectingcables and of the voltagedetector to earth HVoltage detector, plug-inULEV oltage between conductorand earth2 Type 8BK20 Switchgear up to 24 kV with WithdrawableCircuit-BreakersSiemens HA 1999 5 Technical DataElectrical dataWithdrawable vacuumcircuit- breaker panelDisconnector-link panelSectionalizer panelBusbar connection panel, types I and IIRated 12 15 1) 24 Widthmm18001800180010001000 Rated short-time power-frequency withstand voltagekV11201128113611381150 Rated lightning impulse withstand voltagekV11601175119511951125 Rated short- circuit breaking currentmax.

8 KA11501150115011251125 Rated short-time withstand current1 smax. kA115011501150112511253 smax. kA11401140114011251125 Rated short- circuit making current/max. kA11251125112511631163rated peak withstand currentRated normal current of busbarsmax. A40004000400025002500 Rated normal current of feedersmax. A40004000400020002000 Rated 12 15 1)17,5 24 Widthmm18001800180010001000 Rated short-time power-frequency withstand voltagekV11201128113611381150 Rated lightning impulse withstand voltagekV11601175119511951125 Rated short-time withstand current1 smax. kA50/20 2)150/20 2)150/20 2) 25/16 2)25/16 2)3 smax. kA40/20 2)140/20 2)140/20 2) 25/16 2)25/16 2)Rated short- circuit making current/max. kA25/50 2)125/50 2) 125/50 2) 63/40 2)63/40 2)rated peak withstand currentRated normal current of busbarsmax. A40004000400025002500 Rated normal current of feedersmax.

9 A16301630163016301630 Dimensions of HV HRC fusesmm12921292129214421442 withdrawable vacuumswitch panelRated 12 15 1) 24 Widthmm18001800180010001000 Rated short-time power-frequency withstand voltagekV11201128113611381150 Rated lightning impulse withstand voltagekV11601175119511951125 Rated short-time withstand current1 smax. kA115011501150112511253 smax. kA11401140114011251125 Rated peak withstand currentmax. kA11251125112511631163 Rated normal current of busbarsmax. A40004000400025002500 Metering panelRated 12 Widthmm18001800 Rated short-time power-frequency withstand voltagekV11201128 Rated lightning impulse withstand voltagekV11601175 Rated short-time withstand current1 smax. kA115011503 smax. kA11401140 Rated short- circuit making current/max. kA11251125rated peak withstand currentRated normal current of busbarsmax.

10 A40004000 Earthing transformer panel1) Please inquire about kV with corresponding insulating ) When used without HV HRC planningPay attention to theinformation in theadjacent figures andtables for details ofplanning theswitchgear switchgear2 Panel subdivision3 Switchgear termination4 Front operating aisle 5 Distance from wall6 Building wall2 Type 8BK20 Switchgear up to 24 kV with withdrawable circuit -BreakersDimensionsInstallation detailsTechnical Data6 Siemens HA 1999 Panel dimensionsRated 12 15 1) 24 Widthmm18001800180010001000 Height Standardmm20502050205022502250 with additionally mm24502450245026502650mounted low-voltagecompartmentWith cable connection mm25502550255027502750to the busbarsWith de- 20 kAmm20502050205025302530flectingplates fitt- 25 kAmm24502450245025302530ed to complywith criteria1 to 6, for arc fault durationof 1sDepth SingleConnectionmm16501650165020252025bu sbarat front,panelwall mounting 2)Connectionmm17751775177521502150at front,free-standing 2)Connectionmm17751775177521502150at rear,free-standing 2)Duplicate Back-mm3560 3) 3560 3) 3560 3) 43104310busbarto-panelbackarrangementUse able internaldimensions of the low-voltage compartmentRated 12 15 1)