circuit-breaker switchgear – nxair, nxair m and · pdf filepower transmission and...

Power Transmission and Distribution

Circuit-Breaker Switchgear – NXAIR, NXAIR Mand NXAIR P, up to 24 kV, Air-InsulatedMedium-Voltage Switchgear

Catalog HA 25.71 · 2007

Circuit-Breaker Switchgear Types NXAIR, NXAIR M and NXAIR P, up to 24 kV, Air-Insulated · Siemens HA 25.71 · 20072

Page

Types

Circuit-breaker switchgear NXAIR, NXAIR M and NXAIR P are factory-assembled, type-tested, metal-enclosed and metal-clad switchgear forindoor installation according to IEC 62 271-200 / VDE 0671-200(former IEC 60 298 and VDE 0670-6).

Loss of service continuity category: LSC 2B (metal-clad)Partition class: PM (metallic partition)Internal arc classification: IAC A FLR, Isc w 50 kA,

arc duration t = 1 s

(see also Section “Classification” on page 4)

Typical uses

refer to page 4

R-HA

25-3

30a

eps

Application

Types 2Typical uses 3 and 4Classification 4

Requirements

Customer benefits and features 5

Technical Data

Electrical data, dimensions 6 to 8Room planning 9

Product Range

NXAIR 10 and 11

NXAIR M 12 and 13

NXAIR P 14 and 15

Design

Basic panel design,operation, compartments 16 to 19

Components

Vacuum circuit-breakers 20Other switching devices 21Current transformers, post insulators 22Low-voltage equipment 23

Standards

Standards, specifications,guidelines 24 and 25

Notes

26

NXAIR panel

Maximum ratings12 kV / 31.5 kA / 2500 A

NXAIR M panel

Maximum ratings24 kV / 25 kA / 2500 A

NXAIR P panel

Maximum ratings15 kV / 50 kA / 4000 A

R-HA

25-3

12ep

s

R-HA

25-3

33b

eps

Supersedes: Catalog HA 25.71 · 2006

Contents Application

© Siemens AG 2007

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.

Circuit-Breaker Switchgear Types NXAIR, NXAIR M and NXAIR P, up to 24 kV, Air-Insulated · Siemens HA 25.71 · 2007 3

R-HA

25-3

08ep

s

Typical uses

Application

NXAIR switchgear

R-HA

25-3

27ep

s

ApplicationPublic powersupply system

R-HA

25-3

26ep

s

ApplicationIndustry

R-HA25-329a eps

ApplicationIndustry


NXAIR, NXAIR M and NXAIR P circuit-breakerswitchgear are used in transformer andswitching substations, mainly at the primarydistribution level, e.g.

ApplicationPublic power supply system

■ Power supply companies

ApplicationIndustry

■ Power stations

■ Cement industry

■ Automobile industry

■ Iron and steel works

■ Rolling mills

■ Mining industry

■ Textile, paper and food industries

■ Chemical industry

■ Petroleum industry

■ Pipeline installations

■ Offshore installations

■ Electrochemical plants

■ Petrochemical plants

■ Shipbuilding industry

■ Diesel power plants

■ Emergency power supply installations

■ Lignite open-cast mines

■ Traction power supplies

Typical uses Classification

Loss of service continuity category and partition classLoss of service continuity category LSC 2B (metal-clad)Partition class PM (metallic partition)Accessibility to compartments

Busbar compartmentSwitching-device compartmentConnection compartment

Tool-basedInterlock-controlledInterlock-controlled or tool-based

Internal arc classificationThe following internal arcclassifications are fulfilled:IAC A FLR, Isc, tIAC = Internal arc classificationA = 300 mm distance of indicators

for test (installation in closedelectrical service location)

F = Front arrangement of indicatorsfor test

L = Lateral arrangement of indicatorsfor test

R = Rear arrangement of indicatorsfor test

Isc = Test current forNXAIR up to 31.5 kA

= Test current forNXAIR M up to 25 kA

= Test current forNXAIR P up to 50 kA

t = Arc duration 1 s, optionally 0.1 s

In this way, NXAIR, NXAIR M andNXAIR P are suitable for unrestrictedapplication (wall or free-standingarrangement) in electrical servicelocations up to the maximumshort-circuit current ratings.

NXAIR, NXAIR M and NXAIR P switchgear correspondto the following classifications according toIEC 62 271-200 or VDE 0671-200.

Application


Customer benefits and features

Customer benefits Features

• Peace of mind

For power supply companiesand industrial plants, thecertification of the NXAIR familyaccording to the lateststandards has very concreteadvantages: smooth operation,exemplary availability andmaximum safety.

• Factory-assembled, type-tested switchgear according to IEC 62 271-200 or VDE 0671-200

• Modular design with pressure-resistant partitions (switching-device, connection,busbar compartments and low-voltage compartment replaceable)

• Bushing-type transformer principle (post insulator, current measurement,partition integrated in one unit)

• More than 350,000 air-insulated switchgear panels from Siemens in operation worldwide

• Use of maintenance-free vacuum circuit-breakers

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

• Pressure-resistant partitions

• Use of standard, worldwide available components

• Quality management according to DIN EN ISO 9001

• Saves lives

All switchgear types of theNXAIR family are approvedwith internal arc classificationIAC A FLR, loss of servicecontinuity category LSC 2B,partition class PM. This makesthem suitable for universalinstallation, meeting thehighest requirements regard-ing personal safety.

• All switching operations with high-voltage door closed

• Metallic enclosure, earthed shutters and partitions

• Switchgear with internal arc classification according to IAC A FLR (front, lateral and rear accessibility)for all short-circuit currents and an arc duration of 1 s, optionally 0.1 s

• Loss of service continuity category LSC 2B (separate partitions for busbar, connection andswitching-device compartments)

• Partition class PM (metal-clad in pressure-resistant design)

• Clear switch position indicators and control elements on the high-voltage door

• Use of vacuum circuit-breakers

• Standard degree of protection IP3XD

• Positively driven shutters

• Logical mechanical interlocking system

• Increases productivity

Features such as modulardesign, type tests of the circuit-breaker in the switchgear,selective shutdown of apossible arc-fault, confinementof an internal arc to the re-spective compartment andthus, maximum personal safetycontribute to uninterruptedoperation and a remarkableincrease of productivity.

• Modular panel design enables fast replacement of the respective compartments

• Selective shutdown of an arc fault possible

• Loss of service continuity category LSC 2B (separate partitions for busbar, connection andswitching-device compartments)

• Cable testing without isolating the busbar

• Bushing-type transformer principle (post insulator, current measurement,partition integrated in one unit)

• Confinement of internal arc


• Control cables in metallic wiring ducts

• Saves money

Thanks to the use of the newcircuit-breaker series SION, thecompact design of the NXAIRfamily pays twice for the owner.On the one hand building costscan be reduced, and on theother hand, the maintenance-free circuit-breakers and themodular design enablecontinuous operation withoutexpensive shutdown times.


• Maintenance intervals of the switchgear > 10 years

• Interruption of operation reduced to a minimum by modular design,logical mechanical interlocking system

• Enables selective shutdown of a possible arc fault

• Minimized space requirements (reduced building investments) due to compact design

Requirements


��

��

��

��

� �

��

��

Dimensionsin mm

Dimensions

Width B Circuit-breaker panelw 2500 A 800

Disconnector link panelw 2500 A 800

Bus sectionalizerw 2500 A 2 x 800

Metering panel 800

Busbar connection panelw 2500 A

800

Height H1 With standard low-voltage compartment,natural ventilation

2300

H2 With high low-voltage compartment orwith additional compartment for busbar components

2350

Depth T Single busbarw 31.5 kA, w 2500 A 1350

1) Optionally 42 kV

2) Values for 50 Hz: 80 kA60 Hz: 82 kA

Rated values

Rated

-voltage kV 7.2 12

-frequency Hz 50/60 50/60

-short-duration power-frequency kVwithstand voltage(phase-to-phase, phase-to-earth)

20 28 1)

- lightning impulse withstand volt. kV(phase-to-phase, phase-to-earth)

60 75

-short-circuit breaking current 2) max. kA 31.5 31.5

-short-time withst. current, 3 s max. kA 31.5 31.5

-short-circuit making current 2) max. kA 80/82 80/82

-peak withstand current max. kA 80/82 80/82

-normal current of busbar max. A 2500 2500

-normal current of feeders:with circuit-breaker max. Awith disconnector link max. Abus sectionalizer max. Abusbar connection max. Apanel

2500250025002500

2500250025002500

NXAIR Electrical data, dimensions

Technical Data

?siehe dt.Katalog


Dimensionsin mm

Dimensions

Width B Circuit-breaker panelw 2000 A2500 A

8001000

Disconnector link panelw 2000 A2500 A

8001000

Bus sectionalizerw 1250 A1600 A, 2000 A, 2500 A

2 x 8002 x 1000

Metering panel 800

Height H1 With standard low-voltage compartment 2200

H2 With high low-voltage compartment 2550

H3 Standard panel orstandard panel with natural ventilation

2655

H4 Additional compartment for busbar components 2770

Depth T Single busbar 1554

Rated values

Rated

-voltage kV 24

-frequency Hz 50


50

-lightning impulse withstand volt. kV(phase-to-phase, phase-to-earth)

125

-short-circuit breaking current max. kA 25

-short-time withst. current, 3 s max. kA 25

-short-circuit making current max. kA 63

-peak withstand current max. kA 63

-normal current of busbar max. A 2500

-normal current of feeders:with circuit-breaker max. Awith disconnector link max. Abus sectionalizer max. A

250025002500

��

��

��

��

��

��

��

NXAIR M Electrical data, dimensions

Technical Data


Dimensionsin mm

Dimensions

Width B Circuit-breaker panelw 2000 A> 2000 A

8001000

Contactor panel w 400 A 400

Disconnector link panelw 2000 A> 2000 A

8001000

Bus sectionalizerw 2000 A> 2000 A

2 x 8002 x 1000

Metering panel 800

Height H1 With standard low-voltage compartment(w 3150 A)

2225

H2 With high low-voltage compartment 2485

H3 With top-mounted pressure relief ductas standard

2550

H4 With forced ventilation (4000 A) 2710

Depth T Single busbar(except contactor panel)

1635

Contactor panel 1650

Double busbar in back-to-backarrangement (except contactor panel)

3320

�

��

��

��

��

��

�

��

��

NXAIR P Electrical data, dimensions

Rated values

Rated values

-voltage kV 7.2 12 15

-frequency Hz 50/60 50/60 50/60


20 28 35

-lightning impulse withstand volt. kV(phase-to-phase, phase-to-earth)

60 75 95

-short-circuit breaking current max. kA 50 50 50

-short-time withst. current, 3 s max. kA 50 50 50

-short-circuit making current 1) max. kA 125/130 125/130 125/130

-peak withstand current 1) max. kA 125/130 125/130 125/130

-normal current of busbar max. A 4000 4000 4000

-normal current of feeders:with circuit-breaker max. Awith contactor max. Awith disconnector link max. Abus sectionalizer max. A

4000400 2)

40004000

4000400 2)

40004000

4000–40004000

1) Values for 50 Hz: 125 kA60 Hz: 130 kA

2) Depending on rated current of HV HRC fuses installed

Technical Data


��

��

�

��

��

��

��

��

��

��

��

Single-row arrangement (plan view)for single-busbar switchgear

For dimensions B (width) and T (depth) see table on page 6

1) For panel replacement: Control aisle W 1410 mm

For back-to-back and face-to-face arrangement, thecorresponding room dimensions apply as for single-rowarrangement.

For back-to-back arrangement, a 1200 mm wide control aisleis required on the left or on the right of the switchgear.

NXAIR




For back-to-back and face-to-face arrangement, thecorresponding room dimensions apply as for single-rowarrangement.





For back-to-back arrangement and face-to-face arrangment,the corresponding room dimensions apply as for single-rowarrangement.


NXAIR M

��

��

�

��

��

��

��

��

��

��

��

NXAIR P

��

��

�

��

��

��

��

��

��

��

��

Room planning

Room height W 2800 mm



Technical Data


��

��

��

��

��

��

��

��

��

��

��

��

� �

��

��

��

��

��

��

Circuit-breaker panel Disconnecting panel

For other componentsfor busbar and connec-tion compartments referto page 19.

1) The details refer toconventional single-coresealing ends.

NXAIR Panels

Components

��

��

��

��

Cable sealing ends 1)

max. 4 x 500 mm2

per phase

Bar feeder

Withdrawablecircuit-breaker

Disconnector link

Current transformer

Voltage transformer

Make-proofearthing switch

Capacitive voltagedetecting system

Product Range


��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

Bus sectionalizer (mirror-image installation also possible)

Withdrawablepanel

Bus riserpanel

Metering panel

NXAIR Panels


1) Current transformer onlypossible in combinationwith disconnector link.


Components

��

��

��

��

��

��

��

��

��

��

Busbar connection panel

��

��

��

��

Current transformer

Voltage transformer




max. 4 x 500 mm2

per phase

Bar feeder

HV HRC fuse


Disconnector link

Withdrawable voltagetransformer withprimary fuses

Withdrawable voltagetransformer

Product Range


NXAIR M Panels

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

Circuit-breaker panel Disconnecting panel

Components



��

��

��

��


max. 4 x 500 mm2

per phase

Bar feeder


Disconnector link

Current transformer

Voltage transformer



Product Range


��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��


NXAIR M Panels

��

��

��

��

��

��

Metering panel

For other componentsfor busbar and connec-tion compartments referto page 19.1) Current transformer only

possible in combinationwith disconnector link.

Withdrawablepanel

Bus riserpanel

Components

��

��

� �

��

Current transformer

Voltage transformer



HV HRC fuse


Disconnector link

Withdrawable voltagetransformer

Product Range


NXAIR P Panels

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

��

Circuit-breaker panel Disconnecting panel Vacuum contactor panel



Components

��

��

��

��



max. 6 x 500 mm2

per phase

Bar feeder

Withdrawable vacuumcontactor with HV HRCfuses and controltransformer

HV HRC fuse


Disconnector link

Withdrawable vacuumcontactor with HV HRCfuses

Current transformer

Voltage transformer


Bus riser for barconnection

��

��

��

��

��

��

��

��

��

��

Product Range



NXAIR P Panels

Double-busbar switchgear

Double-busbar switchgearconsists of components fromthe single-busbar range.

It can be designed as follows:

• Face-to-face arrangement

• Back-to-back arrangement

Face-to-face arrangement

• Panels from the single-busbar range (circuit-breakerpanel, disconnecting panel,bus sectionalizer and meter-ing panel)

• The two switchgear rows areinterconnected by means ofcables or bars beneath thepanels

• Bus coupler consisting of:– Circuit-breaker panel– Disconnecting panel

Back-to-back arrangement

• Panels from the single-busbar range (circuit-breakerpanel, disconnecting panel,bus sectionalizer and meter-ing panel)

• The two switchgear rows areinterconnected by means ofbars within the panels

• Bus coupler consisting of:– Circuit-breaker panel– Disconnecting panel

��

��

��

��

��

��

��

��

��

Withdrawablepanel

Bus riserpanel

For other componentsfor busbar and connec-tion compartmentsrefer to page 19.

Components

��

��

�

�

Current transformer

Voltage transformer


Bus riser for barconnection



Withdraw. metering unit,withdraw. voltage transf.with primary fuses

Withdrawable meteringunit, withdrawablevoltage transformer

Metering panel

Product Range


A Switching-device compartment

B Busbar compartment

C Connection compartment

D Withdrawable circuit-breaker

E Low-voltage compartment

Operation at the panel

Features

• Integrated mimic diagram

• Recognition of the respectiveswitch positions for circuit-breaker CLOSED/OPEN, dis-connected position, earthingswitch CLOSED/OPEN on theintegrated mimic diagram

• Unambiguous assignment ofactuating openings and con-trol elements to the corres-ponding switch position indi-cators

• All switching operationsalways with high-voltagedoor closed

• Ergonomically favorableheight for all control andindicator elements

• Option: Verification of safeisolation from supply – offeeder or busbar – by meansof a capacitive voltage detect-ing system with panel frontclosed

Interlocks

• Interlocking conditions aresatisfied according toIEC 62 271-200 /VDE 0671-200

• Feeder earthing switchcan only be operated withswitching device in discon-nected position

• Switching device can only bemoved on the movable partwith the associated switch-ing device OPEN and earth-ing switch OPEN

• Switching device can only beoperated in interlocked dis-connected or service position

Beyond the specificationsof the standards

• Coding prevents insertion ofswitching devices for lowerrated normal currents intopanels with higher ratednormal currents

• Interlocking of high-voltagedoor against withdrawablepart

• Option: Electromagneticinterlocks, padlocks

Basic panel design (example)

��

��

��

��

��

��

��

��

��

��

�

��

�

��

��

��

�

�

�

�

�

�

��

�

�

�

�

�

�

�

NXAIR Panel design, operation

11 Mechanical switch position indicator and actuatingopening for the make-proof earthing switch

12 Pressure relief duct

13 Busbars

14 Bushing-type insulator

15 Bushing-type current transformer

16 Voltage transformer

17 Cable connection for 4 cables per phase

18 Make-proof earthing switch

19 Low-voltage plug connector

20 Operating and interlocking unit for thecircuit-breaker

21 Vacuum interrupters

22 Contact system

23 Operating and interlocking unit for moving thecircuit-breaker and for earthing

1 Door of low-voltage compartment

2 Protection device

3 Option: Capacitive voltage detecting systemfor feeder and busbar

4 High-voltage door

5 Locking device for high-voltage door

6 Mimic diagram

7 “ON/OFF” actuating openings for thecircuit-breaker, opening for spring charging

8 Inspection window to recognize thedisconnected/service position, “CLOSED/OPEN” indication of the circuit-breaker,“closing spring charged” indication andoperating cycle counter

9 Door knob for opening the high-voltage door

10 Actuating opening to move the switchingdevice

Design



��

��

��

��

�

�

�

�

�

�

��

��

�

��

��

��

��

��

��

�

��

��

��

�

�

�

�

�

� �

NXAIR M Panel design, operation


Features

• Integrated mimic diagram

• Recognition of the respectiveswitch positions for circuit-breaker CLOSED/OPEN, dis-connected position, earthingswitch CLOSED/OPEN on theintegrated mimic diagram

• Unambiguous assignment ofactuating openings and con-trol elements to the corres-ponding switch position indi-cators

• All switching operationsalways with high-voltagedoor closed

• Ergonomically favorableheight for all control andindicator elements

• Option: Verification of safeisolation from supply – offeeder or busbar – by meansof a capacitive voltage detect-ing system with panel frontclosed

Interlocks

• Interlocking conditions aresatisfied according toIEC 62 271-200 /VDE 0671-200

• Feeder earthing switchcan only be operated withswitching device in discon-nected position

• Switching device can only bemoved on the movable partwith the associated switch-ing device OPEN and earth-ing switch OPEN

• Switching device can only beoperated in interlocked dis-connected or service position

Beyond the specificationsof the standards

• Coding prevents insertion ofswitching devices for lowerrated normal currents intopanels with higher ratednormal currents

• Interlocking of high-voltagedoor against withdrawablepart

• Option: Electromagneticinterlocks, padlocks






11 Mechanical switch position indicator and actuatingopening for the make-proof earthing switch


13 Busbars



16 Voltage transformer

17 Cable connection for 4 cables per phase


19 Low-voltage plug connector

20 Operating and interlocking unit for thecircuit-breaker


22 Contact system

23 Operating and interlocking unit for moving thecircuit-breaker and for earthing

1 Door of low-voltage compartment

2 Protection device

3 Option: Capacitive voltage detecting systemfor feeder and busbar

4 High-voltage door

5 Locking device for high-voltage door

6 Mimic diagram

7 “ON/OFF” actuating openings for thecircuit-breaker, opening for spring charging

8 Inspection window to recognize thedisconnected/service position, “CLOSED/OPEN” indication of the circuit-breaker,“closing spring charged” indication andoperating cycle counter

9 Door knob for opening the high-voltage door

10 Actuating opening to move the switchingdevice

Design


NXAIR P Panel design, operation


Features and interlocks are thesame as for NXAIR, page 16and NXAIR M, page 17.Legend

1 Door of low-voltage compart-ment

2 Protection device

3 Option: Capacitive voltagedetecting system for feeder andbusbar

4 High-voltage door

5 Mechanical lifting mechanism foropening the high-voltage door

6 Locking device for high-voltagedoor

8 “Closing spring charged” indica-tor, switch position indicator forthe switching device and operat-ing cycle counter

9 “ON/OFF” actuating openings forthe circuit-breaker

10 Mechanical switch position indi-cator and actuating opening forthe movable part

11 Mechanical switch position indi-cator and actuating opening forthe make-proof earthing switch

12 Mimic diagram

13 Ventilation duct


15 Busbars




19 Cable connection for 6 cablesper phase

20 Operating and interlocking unitfor moving and operating thecircuit-breaker

21 Contact system


23 Low-voltage plug connector,couples automatically

24 Option: Truck

25 Top-mounted fan unit with fan


Circuit-breaker panel 3150 A panel with natural ventilation

4000 A panel with forced ventilation

�

�

�

��

��

��

��

�

��

��

��

��

�

�

�

�

�

��

��

��

��

�

�

�

��

�

��

�

��

��

��

��

��

��

��






Design


Switching-device compart-ment

• Enclosure made of sendzimir-galvanized sheet-steel

• Pressure relief upwards

• Panel front powder-coatedwith epoxy resin

• Shutter operating mechanismseparately for closing andopening the

– busbar compartment– connection compartment

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

• For NXAIR and NXAIR M:Pressure-resistant partitionsto connection and busbarcompartments

• Metallic ducts on the side forlaying control cables

• Low-voltage plug connectorfor connection of controlcables between primary partand secondary part; automa-tically coupling in NXAIR P

• Switching-device compart-ment for the different panelversions with withdrawabledevices:

– Vacuum circuit-breaker– Disconnector link– Withdrawable metering unit

• Endurance classes for– Circuit-breaker: E2, M2, C2– Withdrawable part: M0

Busbar compartment


• Pressure relief upwards

• Option: Inter unit bus sup-port from panel to panel forNXAIR and NXAIR MStandard: Inter unit bus sup-port from panel to panel forNXAIR P

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

– for NXAIR P, powder-coatedwith epoxy-resin

– option: Insulated busbars

• For NXAIR and NXAIR M:Pressure-resistant partitionsbetween connection andswitching-device compart-ment, pressure-resistant rearwall

• Shutters to be openedseparately and lockable

• Bushing-type insulators forsupporting busbars and foraccommodating uppermating contacts for theswitching device

• Option: Max. 3 bushings-type current transformers

• Option: Coupling electrodefor capacitive voltage detec-tion system

Additional compartments(optional) for busbar compo-nents in NXAIR and NXAIR M,refer also to product range

• Separate, pressure-resistantcompartment above busbarcompartment

• Pressure-resistant partitionwith bushings between addi-tional compartment and bus-bar compartment if voltagetransformers are installed

• Separate pressure relief foradditional compartment, up-wards via pressure relief flaps

• Options: Possibility of install-ing the following components(but not for panels with natu-ral ventilation, refer also toproduct range)

– voltage transformers– make-proof earthing switch

(endurance class: M0, E1)

Connection compartment


• Pressure relief upwardsthrough rear pressure-reliefduct

• For NXAIR and NXAIR M:Pressure-resistant partitionsbetween connection andbusbar compartment

• Shutters to be openedseparately and lockable

• Earthing busbar

• Option: Installation of bush-ing-type insulators instead ofbushing-type current trans-formers

• Option: Coupling electrodefor capacitive voltage detec-tion system

• Option: Pressure-resistantfloor cover

• Connection from front orrear, primary cables frombelow

• Suitable for connection of:– single-core XLPE cables up to

4 x 500 mm2 for NXAIR andNXAIR M, and 6 x 500 mm2

for NXAIR P– three-core cables

3 x 240 mm2 per panel– bars in flat copper with

bushings in a floor cover oras fully-insulated barsincluding floor cover

• Installation of voltage trans-formers

– cast-resin-insulated– 3 x 1-pole– fixed-mounted, without

primary fuses

• Make-proof earthing switch– with manual operating

mechanism– in addition to the standard

interlocking: Between earth-ing switch and withdrawableswitching device, optionallylockable or with electro-magnetic interlock

• Endurance class for make-proof earthing switch: M0, E1

• Surge arresters or limiters– surge arresters for protecting

the switchgear againstexternal overvoltages

– surge limiters for protectingconsumers against switchingovervoltages

NXAIR NXAIR M NXAIR P Panels

Design


for NXAIR for NXAIR M for NXAIR P

5

4

3

1

10

7

14

8 13

12

111

4

5

6

2

3

9

10

R-HA

25-3

14b

eps

R-HA

25-3

15a

eps

Vacuum circuit-breakers

Features

• Corresponding toIEC 62 271-100,VDE 0671-100

• Suitable for all switchingduties

• Circuit-breaker always withmotor operating mechanism,manual operation alwayspossible

• Moving the circuit-breakerwith manual operatingmechanism

• 64-pole low-voltage plugconnector between circuit-breaker and fixed part(automatically coupling inNXAIR P)

• Maintenance-free operatingmechanisms under normalclimatic conditions and max.permissible number of oper-ating cycles

• Contact arms generally withsilver-plated round contacts

1 64-pole low-voltage plug connector2 Primary contacts3 “OFF” pushbutton4 Switch position indicator circuit-breaker5 “ON” pushbutton6 “Spring charged” indicator7 Hand crank coupling for the spring energy

store8 Operating cycle counter9 Actuating opening to moving mechanism

10 Switch position indicator earthing switch11 Actuating opening earthing switch12 Locking/unlocking of the withdrawable part

2

6

11

8

7

9

12

Electrical data for NXAIR NXAIR M NXAIR P

Rated operating voltage up to 12 kV 24 kV up to 15 kV

Rated short-circuitbreaking current

up to 31.5 kA up to 25 kA up to 50 kA

Rated short-timewithstand current

up to 31.5 kA / 3 s up to 25 kA / 3 s up to 50 kA / 3 s

Rated short-circuitmaking current

up to 80/82 kA up to 63 kA up to 125/130 kA

Rated peak withstand current up to 80/82 kA up to 63 kA up to 125/130 kA

Rated normal current up to 2500 A up to 2500 A up to 4000 A

Endurance class E2, M2, C2 E2, M2, C2 E2, M2, C2

Components

1 “ON” pushbutton2 Hand crank coupling for the spring energy store3 “OFF” pushbutton4 “Closing spring charged” indicator5 Switch position indicator6 Operating cycle counter7 Switch position indicator for disconnected/

service position8 Actuating opening for moving9 Switch position indicator of earthing switch

10 Actuating opening for earthing11 Pole columns with moving contacts12 Operating unit13 Interlocking unit14 Truck (optional)


Vacuum contactor

Features

• According to IEC 60 470,VDE 0670-501

• Suitable for operating con-sumers with high switchingfrequencies

• Short-circuit protection for upto 2 HV HRC fuses connectedin parallel

• Voltage supply of contactorcoil via primary-fused controltransformer or via externalpower supply

• Optional latching module forthe contactor

• Moving of the contactor bymanual operating mechanism

• 64-pole low-voltage plug con-nector between the contactorand the fixed part

• Maintenance-free operatingmechanisms under normalclimatic conditions and max.permissible number of oper-ating cycles

• Contact arms generally withsilver-plated round contacts

Vacuum contactor 3TL8

R-HG

11-0

84ep

s

Vacuum contactor 3TL6

R-HG

11-0

85ep

s

Other switching devices

for NXAIR P

Electrical data for 3TL8 3TL6

Rated operating voltage up to 7.2 kV up to 12 kV

Rated short-time withstand current 1) up to 8 kA up to 8 kA

Rated normal current 2) 400 A 400 A

Number of operating cycles 250,000 500,000

1) Can be used in switchgear with short-time withstand currents up to 50 kA due to current limitingHV HRC fuses.

2) Depending on the HV HRC fuses installed.

for NXAIR P

Components


Current transformers and post insulators

Features

• According toIEC 60 044-1, VDE 0414-1

• Cast-resin insulated

• Integrated functions suchas bushing through par-tition, post insulatorfunction, current conduc-tor and measurement,optionally coupling elec-trode for the capacitivevoltage detection system

• In connection with pres-sure-resistant partitions,bushing-type currenttransformers enableselective shutdown ofe.g. a cable fault by meansof the associated circuit-breaker

• Completely replaceablefrom front

• Secondary multiratiopossible

• Primary contacts gener-ally with silver-platedround contacts

• Bushing-type currenttransformers can be cer-tified

Legend

1 Partition between switching-device and connection com-partment

2 Cup bushing

3 Mounting plate

4 Coupling electrode

5 Fixed contact

6 Core with secondary winding

7 Primary conductor

8 Primary connection

Electrical data for NXAIR NXAIR M NXAIR P

Rated operating voltage up to 12 kV 24 kV up to 15 kA

Rated short-time withstand current up to 31.5 kA /1 or 3 s

up to 25 kA /1 or 3 s

up to 50 kA /1 or 3 s

Rated peak withstand current up to 80/82 kA up to 63 kA up to 125/130 kA

Rated normal current up to 2500 A up to 2500 A up to 4000 A

Max. number of secondary cores for transformers 3 3 3

Components

Bushing-type current transformers


Bushing-type insulator


��

��

��

��

� � �

� � � �

��

��

� �

�

� � � �

� � �

��

��

� �

��

� � �

Section Section Section

Bushing-type current transformerup to 2500 A



R-HA

25-3

31ep

s

R-HA

25-3

17ep

s

R-HA

25-3

18ep

s

R-HA

25-3

32ep

s

R-HA

25-3

20ep

s

R-HA

25-3

21ep

s

(example)


Low-voltage compartment

Features

• For accommodation of allprotection, control, measur-ing and metering equipment

• Partitioned safe-to-touchfrom the high-voltage part

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

• Option: Test sockets forcapacitive voltage detectionsystem of feeders or busbar

• Option: Higher low-voltagecompartment

• Option: Separation wall frompanel to panel

• Low-voltage cables are flexi-ble and have metal covers

• Connection of withdrawablepart and panel wiring tolow-voltage compartmentvia 10-pole, coded plugconnectors

• Bus wires are pluggable frompanel to panel

Low-voltage compartment withequipment (example)

R-HA

25-2

92a

eps

Low-voltage equipment

Door of low-voltagecompartment (example)

R-HA

25-3

05a

eps

Components


Standards, specifications, guidelines

Table – Dielectric strength

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

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-freq. withstand volt. to be selected for site altitudes > 1000 m

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

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

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

Example:3000 m site altitude above sea level17.5 kV switchgear rated voltage95 kV rated lightning impulse withstand voltage

Rated lightning impulsewithstand volt. 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 theharmonization agreementreached by the EU countries,their national specificationsconform to the IEC standard.

Type of service location

The switchgear can be usedas 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 instructedin electrical engineering.Untrained or unskilled per-sons may only enter underthe supervision of authorizedpersonnel or properly in-structed persons.

��

��

��

��

��

��

�

��

� � �

��

��

��

��

�

�

Alti

tude

corr

ectio

nfa

ctor

Site altitude in m above sea level

Dielectric strength

• The dielectric strength 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 62 271-1 /VDE 0671-1 (see table“Dielectric strength”).

• 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 dielectric strengthdecreases with increasingaltitude.For site altitudes above1000 m (above sea level)the standards do not provideany guidelines for the insula-tion rating, but leave this tothe scope of special arrange-ments.

• Site altitude– As the altitude increases,

the dielectric strength in airdecreases due to the decreas-ing air density. This reductionis permitted up to a site alti-tude of 1000 m according toIEC 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 of125 kV is to be selected.

Overview of standards (November 2007)

IEC standard VDE standard EN standard

Switchgear NXAIR, NXAIR M,NXAIR P

IEC 62 271-1 VDE 0671-1 EN 62 271-1

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

Vacuum contactor IEC 60 470 VDE 0670-501 EN 60 470

Disconnector and earthingswitch

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 detecting 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

Instrumenttransformers

Current transformer IEC 60 044-1 VDE 0414-1 EN 60 044-1

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

Installation – IEC 61 936-1 VDE 0101 –

Standards


Aseismic capacity

NXAIR P switchgear type istested in accordance with inter-nationally accepted require-ments.

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

• Protection of operating per-sonnel by means of tests forverifying the internal arcclassification

• Internal arcing tests must beperformed in accordancewith IEC 62 271-200 /VDE 0671-200

• The switchgear complieswith criteria 1 to 5 specifiedin the mentioned standards(page 24) for the basic versionup to 50 kA.

• NXAIR, NXAIR M andNXAIR P comply with theinternal arc classification:IAC A FLR up to 50 kA, 1 s,providing for maximum per-sonal safety of switchgearaccessible from all sides.

Standards, specifications, guidelines

Climate and environmentalinfluences

The switchgear may be used,subject to possible additionalmeasures, under the followingenvironmental influences andclimate classes:Environmental influences– Natural foreign materials– Chemically active pollutants– Small animals

Climate classes– 3K3– 3K5– 3KX

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

Current-carrying capacity

• According to IEC 62 271-1 /VDE 0671-1 andIEC 62 271-200 /VDE 0671-200 the ratednormal current refers to thefollowing ambient tempera-tures:

– Maximum of24-hour mean + 35 °C

– Maximum + 40 °C

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

Protection against solidforeign objects, electric shockand water

NXAIR, NXAIR M and NXAIR Pswitchgear types fulfill acc. tothe standards– IEC 62 271-200– IEC 60 529– VDE 0470-1– VDE 0671-200the following degrees ofprotection:

• Definitions of criteria:– Criterion 1

Correctly secured doors andcovers do not open. Limiteddeformations are accepted.

– Criterion 2No fragmentation of theenclosure. Projection of smallparts up to an individual massof 60 g, are accepted.

– Criterion 3Arcing does not cause holesin the accessible sides up toa height of 2 m.

– Criterion 4Horizontal and verticalindicators do no ignite dueto the effect of hot gases.

– Criterion 5The enclosure remainsconnected to its earthingpoint.

• This switchgear up to 31.5 kAis designed with confinementto internal arcs going beyondthe scope of the mentionedstandards; that means that inthe event of an internal fault(arc) in a particular compart-ment, the effects of the arcremain confined to that com-partment:

– No burn-through of partitionsto adjacent compartments

– No burn-through of partitionwalls to adjacent panels

– Pressure-resistant wallsbetween adjacent compart-ments and panels.

• The confinement of an inter-nal arc prevents

– Restrike of an arc fault on liveparts in adjacent compart-ments

– Impermissible deformationof partitions.

Panel NXAIR NXAIR M NXAIR P

Degree of protection of the enclosureoptional

IP3XDIP4X

IP3XDIP4X

IP3XD–

Degree of protection of the enclosurewith ventilation

IP3XDIP4X

IP3XDIP4X

IP3XDIP4X

Degree of protection of compartments IP2X IP2X IP2X

Standards


Responsible for

Technical contents: Herbert SoensSiemens AG, PTD M 1 PPM, Erlangen

General editing: Gabriele PollokSiemens AG, PTD CC M, Erlangen

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.

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 concerning PowerTransmission 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-K1425-A811-A7-7600Dispo 31602KG 11.07 5.0 24 En102847 6101/6503

circuit-breaker switchgear – nxair, nxair m and · pdf filepower transmission and...

Documents