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Power Transmission and Distribution

�� Medium-Voltage Switchgear

Catalog HA 26.31 · 2007

Switchgear Type 8BT1, up to 24 kV, Air-Insulated · Siemens HA 26.31 · 20072

© Siemens AG 2006

Switchgear type 8BT1is a factory-assembled,type-tested switchgearfor indoor installationaccording toIEC 62 271-200 andVDE 0671-200.

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Benefits (see also page 10 for details)

• Saves lives

• Peace of mind

• Increases productivity

• Saves money

8BT1 panelMaximum ratings 24 kV / 25 kA / 2000 A

Typical uses

The 8BT1 switchgear can be used in transformerand switching substations, e.g.:

Application:Power supply system

■ Power supply companies

Application: Industry

■ Power stations

■ Cement industry

■ Automobile industry

■ Iron and steel works

■ Rolling mills

■ Mining industry

■ Textile, paper and foodindustries

■ Chemical industry

■ Petroleum industry

■ Pipeline installations

■ Electrochemical plants

■ Petrochemical plants

■ Diesel power plants

■ Emergency power supplyinstallations

■ Lignite open-cast mines

■ Traction power supplies

��

The products and systems described in this catalogare manufactured and sold according to a certifiedquality and environmental management system(acc. to ISO 9001 and ISO 14001).(DQS Certificate Reg. No. DQS 003473 QM UM).The certificate is accepted in all IQNet countries.

© Siemens AG 2007

PageApplication

Benefits 2

Typical uses 2 and 3

Technical Data

Ratings 4

Classification, dimensions, 5room planning

Product Range

Panels 6 and 7

Design

Panel design 8

Compartments, interlocks, 9operation

Benefits and features 10

Standards

Standards, specifications, 11 and 12guidelines, notes

Invalid: Catalog HA 26.31 · 2006

Benefits, typical uses

Switchgear Type 8BT1, up to 24 kV, Air-Insulated · Siemens HA 26.31 · 2007 3

Typical uses

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ApplicationPublic powersupply system

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ApplicationIndustry

ApplicationIndustry

8BT1 switchgear


1) Depending on the rated currentof the HV HRC fuses installed.

Switchgear 12 kV

Rated voltage 12 kV

Rated frequency 50 Hz

Rated short-duration power-frequency withstand voltage 28 kV

Rated lightning impulse withstand voltage 75 kV

Rated short-time withstand current, 3 s 25 kA

Rated peak withstand current at 50 Hz 63 kA

Rated short-circuit breaking current 25 kA

Rated short-circuit making current at 50 Hz 63 kA

Rated normal current of busbar 2000 A

Rated normal current of feeders– with circuit-breaker– with switch-disconnector– with switch-disconnector with fuses

2000 A630 A400 A 1)

Electrical data (maximum values) of 8BT1

Ratings Rated values(max.)

Switchgear 7.2 kV

Rated voltage 7.2 kV










2000 A630 A400 A 1)

Ratings Rated values(max.)

Switchgear 24 kV

Rated voltage 24 kV










2000 A630 A400 A 1)

�� Ratings


Classification of the 8BT1 switchgear acc. to IEC 62 271-200

Dimensions

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��All panel types Dimensions7.2/12 kV in mmWidth B For max. 1250 A vacuum circuit-breaker 600

For 2000 A vacuum circuit-breaker 800

For switch-disconnector 600

Height H1 With standard low-voltage compartment 2050

H2 With pressure relief system 3) 2300

H2 With lead-off duct 2350

Depth T1 Without low-voltage compartment 1200

T2 With low-voltage compartment 1410

24 kV

Width B For max. 1250 A vacuum circuit-breaker 800

For 2000 A vacuum circuit-breaker 1000

For switch-disconnector 800

Height H1 With standard low-voltage compartment 2050

H2 With pressure relief system 3) 2300

H2 With lead-off duct 2350

Depth T1 Without low-voltage compartment 1200

T2 With low-voltage compartment 1410

Construction and design

Partition class for circuit-breakerLoss of service continuity category

PMLSC2A

Compartment accessibility (standard)– Busbar compartment– Switching-device compartment– Connection compartment, front connection

Tool-basedInterlock-basedInterlock-based

Internal arc classification

Classification IAC

Accessibility– Front– Rear– Lateral

Type AType AType A

Test current kATest duration s

250.1/1.0

Single-row arrangement (plan view)

For dimensions B (width) and T (depth) refer to the table on this page

Front connection

Room planning(room height W 2800 mm, W 3000 mm 3), W 2400 mm 2))

Front

1) For panel replacement:Control aisle W 1600 mm

2) Lead-off duct required

3) For an arc fault duration of 1 s

�� Classification, dimensions, room planning


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Circuit-breaker panel Disconnecting panel Switch-disconnector panel

1) The details refer toconventional single-coresealing ends and arereduced by 1 cable whenusing surge arresters.

Components

Current transformer

Voltage transformerwithout primary fuses

Capacitive voltagedetection system

Make-proofearthing switch

Cable sealing ends 1)

max. 4 x 500 mm2

per phase

HV HRC fuse

SION vacuumcircuit-breaker

Disconnector

Switch-disconnector

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Busbar connection panel

Bus sectionalizer II

Bus sectionalizer I Metering panel

Components

Circuit-breaker

panel

Bus riserpanel

1) The details refer toconventional single-coresealing ends and arereduced by 1 cable whenusing surge arresters.

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Current transformer

Voltage transformerwithout primary fuses

Capacitive voltagedetection system

Voltage transformerwith primary fuses

Make-proofearthing switch

SION vacuumcircuit-breaker

Cable sealing ends 1)

max. 4 x 500 mm2

per phase

Panels

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Circuit-breaker

panel

Bus riserpanel


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Basic panel design (example)

A Combined switching-device/connection compartment

B Busbar compartment

D Switching-device truck

E Low-voltage compartment/low-voltage niche

Design: Circuit-breaker panel

Design: Switch-disconnector panel

Circuit-breaker panel12 kV, 1250 A

Legend for panel design:

1 Door of low-voltagecompartment

2 Opening for locking or unlockingthe low-voltage compartmentdoor

3 Option: Capacitive voltagedetection system for feeder andbusbar

4 High-voltage door of switching-device compartment

5 Inspection window for checkingthe disconnected/service posi-tion of the switching-device truck

6 Opening for locking or unlockingthe high-voltage door

7 Actuating opening for the busbarearthing switch

8 Actuating opening for mecha-nical charging of circuit-breakerclosing spring

9 Openings for manual operation(ON/OFF) of the circuit-breaker

10 Inspection window for checkingthe CLOSED/OPEN indication ofthe circuit-breaker, the “springcharged” indication andoperating cycle counter

11 Knob for opening the door

12 Actuating opening for movingthe switching-device truck

13 Actuating opening for theearthing switch

14 Busbars

15 Make-proof busbar earthingswitch

16 Bushings

17 Busbar voltage transformer

18 Current transformer

19 Voltage transformer

20 Make-proof earthingswitch

21 Cable sealing ends

22 Pressure relief

23 Low-voltage plug connector

24 Switching-device truck

25 Switch-disconnector

26 HV HRC fuse

27 Integrated partition

28 Operating mechanism forswitch-disconnector

29 Operating mechanism forearthing switch

30 Actuating opening for theswitch-disconnector

31 Inspection window for checkingthe switch-disconnector position,the earthing switch position andthe “fuse tripped” indication

Switch-disconnector panel12 kV, 1250 A

��Panel design


Combined switching-device/connection compartment

• All switching operations withhigh-voltage door closed

• Pressure relief upwards

• Doors, front frames and endwalls are powder-coated withepoxy resin. Rear wall andceiling components are madeof galvanized sheet metal

• Partition class:Metallic, earthed shuttersand partitions ensure parti-tion class PM for circuit-breaker panel

• High-voltage door pressure-resistant in the event ofinternal arcs in the panel

• Metallic ducts on the side forlaying control cables

• Interlocking betweenhigh-voltage door andcircuit-breaker truck ensuresinterlock-based access

• Switching-device compart-ment to accommodate com-ponents for implementingvarious panel versions with

– Vacuum circuit-breaker– Disconnecting truck– Metering truck

• Suitable for connection of– Single-core cables– Three-core cables

• Earthing busbar

• Connection from front inter-lock-based

• Option: Pressure-resistantfloor cover

• Use of block-type currenttransformers

• Interlocked high-voltage doorwith connection from frontprovides interlock-based ac-cess

Components at the panelconnection (option)

• Single-core XLPE cablesup to max. 4 x 500 mm2

per phase

• Three-core XLPE cablesup to max. 2 x 300 mm2

per phase

• Coupling electrode forcapacitive voltage detectionsystem

• Voltage transformers– Cast-resin insulated– Max. 3 x 1-pole– Fixed-mounted, without

primary fuses

• Make-proof earthing switches– With manual operating

mechanism– In addition to standard inter-

locking of earthing switch/circuit-breaker truck,optionally lockable or withelectromagnetic interlock

• Surge arresters– Surge arresters for protecting

the switchgear against exter-nal overvoltages

Busbar compartment

• Pressure relief upwards

• Busbar transverse partitionbetween panels

• Busbars made of flat copper,bolted from panel to panel

– For rated normal currentsup to 2000 A

• Bolted front covers providetool-based access

• Option: Coupling electrodefor capacitive voltagedetection system

• Options: Possibility of install-ing the following compo-nents

– Voltage transformers– Busbar earthing switch

Interlocks

• Interlocking conditionsare satisfied according toIEC 62 271-200 /VDE 0671-200

• Earthing switch can only beoperated with circuit-breakertruck in disconnected posi-tion

• Circuit-breaker truck can onlybe moved with circuit-breaker“OPEN” and earthing switch“OPEN”

• Circuit-breaker can only beoperated in interlocked dis-connected or service position

• Mechanical coding on thecircuit-breaker truck preventsinsertion of similar circuit-breaker trucks for lower ratednormal currents into panelswith higher rated normal cur-rents

• Circuit-breaker truck can onlybe moved from disconnectedto service position with doorclosed

• The high-voltage door canonly be opened when thecircuit-breaker truck is indisconnected position

• Option: Electromagneticinterlocks

Low-voltage compartment

• Accommodates equipmentfor protection, control,measuring and metering

• Separated from the high-voltage part of the panel,safe-to-touch

• Low-voltage compartmentcan be removed, bus wiresand control cables areplugged in

• Option: Test sockets forcapacitive voltage detectionsystem

Low-voltage cables

• Control cables of the panelare flexible and have metalliccovers

• Connection between switch-ing-device truck and panelwiring to low-voltage com-partment via 64-pole codedplug connectors

• Bus wires pluggable frompanel to panel

Compartments, interlocks, operation

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Benefits Features

• Saves lives • All switching operations including emergency manual operationswith high-voltage door closed

• Interlocking between high-voltage door and switching devices

• Rack-in, rack-out operations of the circuit-breaker truck with high-voltage door closed

• Metallic, earthed shutters and partitions, partition class: PM for circuit-breaker panels

• Internal arc classification up to 25 kA, 1 s, according to IEC 62 271-200, Annex A

• Use of vacuum circuit-breakers

• Peace of mind • Factory-assembled, type-tested switchgear according to IEC 62 271-200

• Type testing of the circuit-breaker and make-proof earthing switch inside the panel

• Use of standard, worldwide available components

• Use of maintenance-free vacuum circuit-breakers

• Quality management according to DIN EN ISO 9001

• Design based on global best practice sharing and experience, compact design with high flexibility

• Increases productivity • Use of metallic, earthed shutters and partitions ensures highest loss of service continuitycategory of the switchgear (LSC2A according to IEC 62 271-200) during maintenance

• Use of maintenance-free vacuum circuit-breakers

• Cable testing without isolating the busbar

• Saves money • Use of maintenance-free vacuum circuit-breakers

• Compact design requires minimum space

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��Benefits and features

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Overview of standards (October 2007)

IEC standard VDE standard EN standard

Switchgear 8BT1 IEC 60 694 VDE 0670-1000 EN 60 694

IEC 62 271-200 VDE 0671-200 EN 62 271-200

Devices Circuit-breaker IEC 62 271-100 VDE 0671-100 EN 62 271-100

Disconnector andearthing switch

IEC 62 271-102 VDE 0671-102 EN 62 271-102

Switch-disconnector IEC 60 265-1 VDE 0670-301 EN 60 265-1

Switch-disconnector /fuse combination

IEC 62 271-105 VDE 0671-105 EN 62 271-105

HV HRC fuses IEC 60 282 VDE 0670-4 EN 60 282

Voltage detection systems IEC 61 243-5 VDE 0682-415 EN 61 243-5

Degree ofprotection

– IEC 60 529 VDE 0470-1 EN 60 529

Insulation – IEC 60 071 VDE 0111 EN 60 071

Transformers Current transformers IEC 60 044-1 VDE 0414-1 EN 60 044-1

Voltage transformers IEC 60 044-2 VDE 0414-2 EN 60 044-2

Installation – IEC 61 936-1 VDE 0101 –

Altitude correction factor Ka

For site altitudesabove 1000 m, thealtitude correctionfactor Ka is recom-mended, depend-ing on the actualsite altitude abovesea level.

Rated short-dur. power-frequ. withstand volt. for site altitudes > 1000 m to be selected

W Rated short-duration power-frequency withstand voltage up to w 1000 m · Ka

Rated lightning impulse withstand voltage for site altitudes > 1000 m to be selected

W Rated lightning impulse withstand voltage up to w 1000 m · Ka

Example:

3000 m site altitude above sea level,17.5 kV switchgear rated voltage95 kV rated lightning impulse withstand voltage

Rated lightning impulse withstandvoltage to be selected 95 kV · 1.28 = 122 kV

Standards

The switchgear complies withthe relevant standards andspecifications applicable atthe time of type tests.

In accordance with the harmo-nization agreement reached bythe countries of the EuropeanCommunity, their nationalspecifications conform to theIEC standard.

Type of service location

The switchgear can be usedfor indoor installation inaccordance with IEC 61 936(Power installations exceeding1 kV AC) and VDE 0101

• Outside lockable electricalservice locations at placeswhich are not accessible tothe public. Enclosures ofswitchgear can only beremoved with tools.

• Inside lockable electricalservice locations. A lockableelectrical service location isa place outdoors or indoorsthat is reserved exclusivelyfor housing electrical equip-ment and which is kept un-der lock and key. Access isrestricted to authorized per-sonnel and persons whohave been properly instruc-ted in electrical engineering.Untrained or unskilled per-sons may only enter underthe supervision of authorizedpersonnel or properly in-structed persons.

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Site altitude in m above sea level

Insulating capacity

• The insulating capacity is veri-fied by testing the switchgearwith rated values of short-duration power-frequencywithstand voltage and light-ning impulse withstand volt-age according to IEC 60 694/VDE 0670-1000 (see table“Insulating capacity”).

• The rated values are referredto sea level and to normalatmospheric conditions(1013 hPa, 20 °C, 11 g/m3

humidity in accordance withIEC 60 071 and VDE 0111).

• The insulating capacitydecreases with increasingaltitude.For site altitudes above1000 m (above sea level)the standards do not provideany guidelines for the insula-tion rating. Instead, specialregulations apply to thesealtitudes.

• Site altitude– As the altitude increases, the

insulating capacity of insula-tion in air decreases due tothe decreasing air density.This reduction is permittedup to a site altitude of 1000 maccording to IEC and VDE.

– For site altitudes above1000 m a higher insulationlevel must be selected. Itresults from the multipli-cation of the rated insulationlevel for 0 to 1000 m with thealtitude correction factor Ka.

Result:

According to the abovetable, a switchgear for arated voltage of 24 kV witha rated lightning impulsewithstand voltage of 125 kVis to be selected.

Table – Insulating capacity

Rated voltage (rms value) kV 7.2 12 15 17.5 24

Rated short-duration power-frequency withstand voltage (rms value)

– Across isolating distances kV 23 32 39 45 60

– Between phases and to earth kV 20 28 35 38 50

Rated lightning impulse withstand voltage (peak value)

– Across isolating distances kV 70 85 105 110 145

– Between phases and to earth kV 60 75 95 95 125

Standards, specifications, guidelines

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Terms

“Make-proof earthing switches”are earthing switches withshort-circuit making capacityaccording to– IEC 62 271-102 and– VDE 0671-102/

EN 62 271-102

Internal arc classification

• Safety of operating personnelensured by tests to verify in-ternal arc classification.

• Internal arc tests in accord-ance with IEC 62 271-200/VDE 0671-200, Annex A.

• The switchgear complies withcriteria 1 to 5 specified in thementioned standards for thebasic version up to 25 kA.

• Definitions of the criteria:

– Acceptance criterion 1Covers and doors remainclosed. Limited deformationsare accepted.

– Acceptance criterion 2No fragmentation of theenclosures. No projection ofsmall parts above 60 gweight.

– Acceptance criterion 3No holes in the accessiblesides up to a heigth of 2 m.

– Acceptance criterion 4Indicators do not ignite dueto the effect of hot gases.

– Acceptance criterion 5The enclosure remainsconnected to its earthingparts.

Current-carrying capacity

• According to IEC 60 694/VDE 0670-1000 andIEC 62 271-200/VDE 0671-200 current-carrying capacities refer tothe following ambienttemperatures:

– Maximum of24-hour mean + 35 °C

– Maximum + 40 °C

• The current-carrying capacityof the panels and busbarsdepends on the ambienttemperature outside theenclosure.

• To attain the maximum ratednormal currents, the panelsare provided with natural orforced ventilation.

Climate and ambientconditions

The switchgear may be used,subject to possible additionalmeasures, under the followingambient conditions and climateclasses:Ambient conditions– Natural foreign materials– Chemically active pollutants– Small animals

Climate classes– 3K3– 3K5

The climate classes areclassified according toIEC 60 721-3-3.

Protection against solidforeign bodies, electric shockand ingress of water

8BT1 switchgear fulfills acc. tothe standards– IEC 62 271-200/VDE 0671-200– IEC 60 529/VDE 0470-1the following degrees ofprotection:– Enclosure: IP 4X– Compartments: IP 2X

��Standards, specifications, guidelines, notes

Notes

If not stated otherwise on theindividual pages of this catalog,we reserve the right to includemodifications, especiallyregarding the stated values,dimensions and weights.

Drawings are not binding.

All product designations usedare trademarks or productnames of Siemens AG or othersuppliers.

If not stated otherwise, alldimensions in this catalog aregiven in mm.


Responsible for

Technical contents:Jan GrossSiemens AG, Dept. PTD M 1 PPMErlangen

General editing:Gabriele PollokSiemens AG, Dept. PTD CC MErlangen

The information in this document contains general descriptions of the technical options available, which do not always have to be present in individual cases.The required features should therefore be specified in each individual case at the time of closing the contract.

For questions concerningPower Transmission and Distribution:You can contact our Customer SupportCenter 24 hours a day, 365 days a year.Tel.: +49 180/524 70 00Fax: +49 180/524 24 71(Charges depending on provider)E-Mail: [email protected]/energy-support

Siemens AGPower Transmission and DistributionMedium Voltage DivisionPostfach 32 4091050 ErlangenGermany

www.siemens.com/medium-voltage-switchgear

Subject to change without noticeOrder No.:E50001-K1426-A301-A2-7600Dispo 31602KG 11.07 3.0 16 En102811 6101/6493

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