Siemens NXAIR S User Manual

Siemens Ltd., China

No.7 Wangjing Zhonghuan Nanlu,Chaoyang District, Beijing 100102
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Xi'an Rep. Office

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Shenzhen Branch

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Post Code: 200245
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Fax:[phone]

Order Number: JS016

2000

2006.10

SSLS-JS016-A

Air -In s u l a t e d Me d iu m -Volt a g e

Switch gea r NXAIR S

Compact and Reliable in accordance with GB3906, DL404 (insulation), IEC 62271-200

Power Transmission and Distribution

New Standards
for the Market

Since the introduction of the type series NXAIR in 1998,
Siemens has redefi ned the performance features of
switchgear. Their extraordinary operational reliability
due to modular design, their personal safety thanks to
arc-fault tested construction, and the optimal operating
symbols have set a standard on the market. Therefore,
power supply utilities as well as industrial enterprises
trust in NXAIR family when maximum reliability and
quality is requested. And they are in best company, as
proved by a basis of approx. 18,000 panels installed
world-wide in power distribution systems - sometimes
in most adverse operating conditions.
To continue with this success also in the future, the
complete NXAIR family has been revised and adjusted
to today,s requirements.

2

Prepared for the Future
with IEC 62271-200

In autumn 2004, the existing switchgear standards for factory-assembled, metal-enclosed
switchgear were redefi ned and documented in IEC 62271-200. Siemens has reacted to these
changes by developing the SION vacuum circuit-breaker - one of twelve awarded
corporate"inventions of the year" 2005.

Compact design in combination with high reliability predestined this circuit-breaker to
application in NXAIR S switchgear. This made it possible not only to introduce one of the first
switchgear types certified to the new standards on the market, but also to make them more
compact in order to obtain e.g. lower building costs for the user, thus making the building
more cost-effi cient.

Air-insulated medium-voltage switchgear NXAIR S is factory-assembled, type-tested, metal­enclosed switchgear for indoor installation according to GB3906, DL404 (insulation), IEC
62271-200(former IEC 60298).

Technical specs

Service continuity category LSC 2B (metal-clad)

Partition class PM (metal)

Internal arc classification IAC A FLR, I

IAC Internal arc classifi cation

A300 mm distance of indicators for test

FIndicators for test at the front
LIndicators for test at the side
R Indicators for test at the rear

I

40kA

sc

t = 1 s

In this way,NXAIR S switchgear is applicable without restrictions for wall-standing or free­standing arrangement in electrical service locations up to the maximum short-circuit current

,t

sc

3

With NXAIR-Family,
You Are on the Safe Side

Peace of Mind

For power supply companies and industrial
enterprises, the certifi cation of the NXAIR family
to the new standard offers very practical
advantages: Smooth operation, exemplary
availability and optimal security.

Factory-assembled, type-tested switchgear to
GB3906, DL404 (insulation) and IEC 62271-200
Modular construction with pressure-resistant
partitions (switching-device, connection, busbar
and low-voltage compartments are
exchangeable)
Principle of bushing-type current transformers
(combination of post insulator, current
measurement, partition)
More than 300,000 air-insulated switchgear
panels of Siemens in operation world-wide
Use of maintenance-free vacuum circuit­breakers
Vacuum circuit-breaker and earthing switch type­tested in the panel
Pressure-resistant partitions
Use of standard components available world­wide
Quality assurance to DIN EN ISO-9001

Saves Lives

All switchgear types of the NXAIR family are
approved for the internal arc classifi cation
IAC A FLR, service continuity category LSC 2B,
partition class PM. Thus they are universally
applicable, meeting the highest requirements
regarding personal safety.

All operations behind closed high-voltage door
Metal enclosure and compartmentalization
High-voltage door locked
Switchgear with internal arc classi fication
IAC A FLR (accessible from front, side and
rear) for all short-circuit currents and arc­fault duration of 1 s
Service continuity category LSC 2B (separate
compartments for busbar, connection and
switching device)
Partition class PM (metal-clad) in pressure­resistant design
Unambiguous switch position indicators and
control elements on the high-voltage door
Use of vacuum circuit-breakers
Standard degree of protection IP4X
Positively driven shutters
Logical mechanical interlocking system

Technical data NXAIR S

Rated

-voltage kV 7.2 12

-frequency Hz 50 50

-short-duration power-frequency withstand voltage

kV 32 42

-lightning impulse withstand voltage kV 60 75

-short-circuit breaking current.max kA 40 40

-short-time withstand current, 4s.max

kA 40 40

-short-circuit making current.max kA 100 100

-peak withstand current.max kA 100 100

-normal current of busbar .max A 3150 3150

-normal current of feeders.max A3150 3150
Width

<

630 A,

=

1250 A
2000 A

<

31.5 kA

=

mm 600 600
mm 800 800

mm 800 800
2500 A mm 800 800
3150 A mm 1000 1000

Height mm 2150 2150
Depth mm 1350

mm 1450

<

31.5 kA,

1)

=

2)

3150 A, 40 kA

<

2500 A

=

1)

2)

1350
1450

1)

2)

Product range NXAIR S

Circuit-breaker panel
Disconnector panel
Metering panel
Contactor panel
Fixed-mounted switch-disconnector panel
Bus sectionalizer

√
√
√
√
√
√

5

With NXAIR-Family,
You Are on the Economic Side

Increases Productivity

Functions such as modular construction, type
tests of the circuit-breaker inside the switch­gear, selective shutdown of a possible arc fault,
confi nement of an internal arc to the respective
compartment, and therefore maximum opera­tional reliability provide for uninterrupted opera­tion and a considerable increase of productivity.

Modular panel design enables fast replace­ment of the respective compartments
Selective shutdown of an arc fault possible
Service continuity category LSC 2B
(separate compartments for busbar,
connection and switching device)
Cable testing without isolating the busbar
Principle of bushing-type current transformer
Con finement of internal arc to respective
compartment
Use of maintenance-free vacuum
circuit-breakers
Control cables in metallic wiring ducts

6

Customer Orientation

The compact design of the NXAIR family by
using the new circuit-breaker series SION pays
off twice for the operator. On the one hand,
the building costs can be reduced, and on the
other hand, the maintenance-free circuit-break­ers and the modular design enable continuous
operation to a large extent without expensive
shutdown times.

Maintenance-free vacuum circuit-breakers
Mainte nance intervals of the switchgear
> 10 years under normal conditions
Interruption of operation reduced to a
minimum by modular design and logical
mechanical interlocking system
Selective shutdown of a possible arc fault
is possible
Minimum space requirements due to
compact design

E

A

B

A: Switching-device compartment
B: Busbar compartment
C: Connection compartment

D

C

D: Withdrawable circuit-breaker
E: Low-voltage compartment

7