Siemens NXAIR User manual

Medium-Voltage Switchgear
Air-Insulated Switchgear NXAIR
≤17.5 kV / ≤40 kA / ≤4000 A Busbar Current
OPERATING INSTRUCTIONS
Order No.:
110-0134.9
Issue:
January 2019
Revision:
14
© Siemens AG 2019. All rights reserved.

2 NXAIR / ≤ 40 kA 110-0134.9 / 14
About these Instructions
These instructions do not purport to cover all details
or variations in equipment. They can also not provide
for every possible contingency to be met in
connection with installation or operation.
For details about technical design and equipment
like e. g. technical data, secondary equipment, circuit
diagrams, please refer to the order documents.
The switchgear is subject to continuous technical
development within the scope of technical progress.
If not stated otherwise on the individual pages of
these instructions, we reserve the right to modify the
specified values and drawings.
All dimensions are given in mm.
For further details, e.g. about additional equipment,
please refer to catalog HA 25.71.
Should further information be desired or should
particular problems arise which are not covered
sufficiently by these instructions, the matter should
be referred to the competent Siemens department.
The contents of this instruction manual shall not
become part of or modify any prior or existing
agreement, commitment or relationship. The Sales
Contract contains the entire obligations of Siemens.
The warranty contained in the contract between the
parties is the sole warranty of Siemens.
Any statements contained herein do not create new
warranties or modify the existing warranty.

110-0134.9 / 14 NXAIR / ≤40 kA 3
Safety instructions
1 Safety instructions
Hazards are classified in accordance with ISO 3864-2 using the following keywords:
•DANGER, WARNING or CAUTION, in case of personal injury
•NOTICE for material damage
Hazards are classified and indicated in the Operating Instructions as follows:
DANGER
Signal word indicates an immediate and imminent hazardous situation.
If the hazard is not avoided, death or serious injury will be the consequence.
WARNING
Signal word indicates a potentially hazardous situation.
If the hazardous situation is not avoided, death or serious injury can be the
consequence.
CAUTION
Signal word indicates a potentially hazardous situation.
If the hazardous situation is not avoided, minor or moderate injury can be the
consequence.
Definitions and symbols
NOTICE
Indicates a potentially damaging situation.
If the damaging situation is not avoided, the product or something in its vicinity
may sustain damage.
INFORMATION
Provides additional information to clarify or simplify a procedure.
Observe the information.
Operation symbol:
Asks the operator to perform an operation.
Result symbol:
✓
Identifies the result of an operation.

4 NXAIR / ≤ 40 kA 110-0134.9 / 14
Content
1Safety instructions................................................................................................................................... 3
2General instructions................................................................................................................................. 9
2.1 General instructions........................................................................................................................................ 9
2.2 Five Safety Rules of Electrical Engineering .................................................................................................... 9
2.3 Hazardous substances ................................................................................................................................... 9
2.4 Personal protective equipment (PPE)............................................................................................................10
2.5 Due application..............................................................................................................................................10
2.6 Qualified personnel........................................................................................................................................10
2.7 Update of the firmware of protection relays....................................................................................................11
3Features................................................................................................................................................... 12
4Technical data......................................................................................................................................... 13
4.1 Complete switchgear .....................................................................................................................................13
4.2 Basic prescriptions and standards.................................................................................................................13
4.3 Electromagnetic compatibility –EMC.............................................................................................................14
4.4 Rating plates..................................................................................................................................................14
4.5 IAC classification............................................................................................................................................14
4.6 Panel dimensions...........................................................................................................................................15
4.7 Room planning...............................................................................................................................................17
4.8 Operating conditions......................................................................................................................................17
4.9 Vacuum circuit-breaker type 3AE...................................................................................................................17
4.10 Operating instructions for circuit-breaker type 3AE........................................................................................18
4.11 Contactor type 3TL and 3TM..........................................................................................................................18
4.12 Operating instructions for contactor type 3TL8 and 3TM3 .............................................................................19
4.13 Switch-fuse combination typeL-TRI 5F ..........................................................................................................20
4.14 Operating instructions for switch-fuse combination L-TRI 5F.........................................................................20
5Overview of panel types ........................................................................................................................ 21
6Panel design ........................................................................................................................................... 25
6.1 Basic design...................................................................................................................................................25
6.2 Basic design circuit-breaker panel.................................................................................................................26
6.3 Basic design circuit-breaker panel with forced ventilation..............................................................................26
6.4 Basic design contactor panel with panel width 435 mm.................................................................................27
6.5 Basic design contactor panel with panel width 600 mm.................................................................................27
6.6 Basic design switch-disconnector panel ........................................................................................................28
7Interlocks................................................................................................................................................. 29
7.1 Mechanical interlocks in panel versions with withdrawable parts...................................................................29
7.2 Mechanical interlocks in panel versions with switching-device trucks............................................................30
7.3 Mechanical interlocks in panel versions with switch-fuse combination ..........................................................30
7.4 Additional electromagnetic interlocks (optional).............................................................................................31
7.5 Additional padlock interlock (optional)............................................................................................................31
7.6 Additional key-operated interlock (optional)...................................................................................................32
8Accessories ............................................................................................................................................ 33
8.1 Operating tools...............................................................................................................................................33
8.2 Service truck..................................................................................................................................................35
8.3 Service truck versions....................................................................................................................................35
9Customer support .................................................................................................................................. 38
9.1 Service...........................................................................................................................................................38
9.2 Repairs...........................................................................................................................................................38
9.3 Before you call...............................................................................................................................................38
9.4 Service contact ..............................................................................................................................................38
10 Operating the circuit-breaker panel...................................................................................................... 39
10.1 Control elements at the front side of the panel...............................................................................................39
10.2 Position indicators visible on high-voltage door .............................................................................................40
10.3 Access to compartments................................................................................................................................40
10.4 Opening the high-voltage door.......................................................................................................................41
10.5 Closing the high-voltage door ........................................................................................................................42
10.6 High-voltage door with ventilation flap ...........................................................................................................44
10.7 Positions of the withdrawable circuit-breaker / circuit-breaker truck...............................................................46
10.8 Racking the withdrawable circuit-breaker / circuit-breaker truck to service position.......................................47

Content
110-0134.9 / 14 NXAIR / ≤40 kA 5
10.9 Racking the withdrawable circuit-breaker / circuit-breaker truck to test position............................................50
10.10 Closing the circuit-breaker electrically ...........................................................................................................53
10.11 Opening the circuit-breaker electrically..........................................................................................................54
10.12 Closing the circuit-breaker manually..............................................................................................................55
10.13 Opening the circuit-breaker manually............................................................................................................58
10.14 Discharging the spring energy store..............................................................................................................60
10.15 Charging the spring energy store manually...................................................................................................61
10.16 Earthing the feeder manually.........................................................................................................................64
10.17 De-earthing the feeder manually....................................................................................................................66
10.18 Removing the low-voltage connector.............................................................................................................69
10.19 Plugging on the low-voltage connector..........................................................................................................70
10.20 Taking the withdrawable circuit-breaker out of the panel...............................................................................72
10.21 Inserting the withdrawable circuit-breaker in a panel.....................................................................................77
10.22 Taking the circuit-breaker truck out of the panel............................................................................................86
10.23 Inserting the circuit-breaker truck in a panel..................................................................................................89
11 Operating the disconnecting panel.......................................................................................................98
11.1 Control elements at the front side of the panel ..............................................................................................98
11.2 Position indicators visible on high-voltage door.............................................................................................98
11.3 Access to compartments ...............................................................................................................................99
11.4 Opening or closing the high-voltage door ......................................................................................................99
11.5 Racking the withdrawable disconnector link / disconnector truck ..................................................................99
11.6 Removing or plugging on the low-voltage connector...................................................................................101
11.7 Taking the withdrawable disconnector link / disconnector truck out of a panel or inserting in a panel.........101
11.8 Earthing or de-earthing the feeder manually................................................................................................101
11.9 Design of the withdrawable disconnector link / disconnector truck..............................................................101
12 Operating the metering panel ..............................................................................................................102
12.1 Control elements at the front side of the panel ............................................................................................102
12.2 Position indicator visible on high-voltage door.............................................................................................102
12.3 Access to compartments .............................................................................................................................103
12.4 Opening or closing the high-voltage door ....................................................................................................103
12.5 Racking the withdrawable metering part / metering truck............................................................................103
12.6 Removing or plugging on the low-voltage connector...................................................................................103
12.7 Taking the withdrawable metering part / metering truck out of the panel or inserting in a panel..................104
12.8 Replacing protection fuse-links....................................................................................................................104
13 Operating the contactor panel with panel width 435 mm .................................................................109
13.1 Control elements at the front side of the panel ............................................................................................109
13.2 Position indicator visible on high-voltage door.............................................................................................110
13.3 Access to compartments .............................................................................................................................110
13.4 Opening the high-voltage door.....................................................................................................................110
13.5 Closing the high-voltage door......................................................................................................................111
13.6 Positions of the contactor truck....................................................................................................................113
13.7 Racking the contactor truck to service position............................................................................................114
13.8 Racking the contactor truck to test position .................................................................................................116
13.9 Closing the contactor electrically .................................................................................................................118
13.10 Opening the contactor electrically................................................................................................................118
13.11 Opening the contactor manually..................................................................................................................119
13.12 Manual emergency opening of the contactor...............................................................................................121
13.13 Operating conditions without auxiliary voltage.............................................................................................122
13.14 Earthing the feeder manually.......................................................................................................................125
13.15 De-earthing the feeder manually..................................................................................................................127
13.16 Taking the contactor truck out of the panel..................................................................................................129
13.17 Inserting the contactor truck in a panel........................................................................................................133
13.18 Replacing HV HRC fuse-links......................................................................................................................138
13.19 Motor starting currents.................................................................................................................................146
13.20 Coordinating the components of the motor circuit........................................................................................146
14 Operating the contactor panel with panel width 600 mm .................................................................148
14.1 Control elements at the front side of the panel ............................................................................................148
14.2 Position indicators visible on high-voltage door...........................................................................................149
14.3 Access to compartments .............................................................................................................................149
14.4 Opening the high-voltage door.....................................................................................................................150
14.5 Closing the high-voltage door......................................................................................................................151
14.6 Positions of the contactor truck....................................................................................................................153
14.7 Racking the contactor truck to service position............................................................................................154
14.8 Racking the contactor truck to test position.................................................................................................157
14.9 Closing the contactor electrically .................................................................................................................160
14.10 Opening the contactor electrically................................................................................................................161
14.11 Opening the contactor manually..................................................................................................................162
14.12 Operating conditions without auxiliary voltage.............................................................................................164

Content
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14.13 Earthing the feeder manually.......................................................................................................................169
14.14 De-earthing the feeder manually..................................................................................................................171
14.15 Removing the low-voltage connector...........................................................................................................173
14.16 Plugging o the low-voltage connector ..........................................................................................................175
14.17 Taking the contactor truck out of the panel..................................................................................................177
14.18 Inserting the contactor truck in a panel ........................................................................................................180
14.19 Replacing HV HRC fuse-links......................................................................................................................190
14.20 Motor starting currents.................................................................................................................................198
14.21 Coordinating the components of the motor circuit........................................................................................198
14.22 Replacing protection fuse-links for the control transformer..........................................................................199
15 Operating the busbar connection panel type I.................................................................................. 203
15.1 Control elements at the front side of the panel.............................................................................................203
15.2 Position indicator visible on high-voltage door.............................................................................................203
15.3 Access to compartments..............................................................................................................................204
15.4 Opening or closing the high-voltage door ....................................................................................................204
15.5 Racking the withdrawable metering part / metering truck ............................................................................204
15.6 Removing or plugging on the low-voltage connector ...................................................................................204
15.7 Taking the withdrawable metering part / metering truck out of a panel or inserting in a panel.....................205
15.8 Replacing protection fuse-links....................................................................................................................205
16 Operating the busbar connection panel type II................................................................................. 210
16.1 Panel front....................................................................................................................................................210
16.2 Opening the high-voltage door.....................................................................................................................210
16.3 Closing the high-voltage door ......................................................................................................................211
17 Operating the busbar current metering panel................................................................................... 213
17.1 Panel front....................................................................................................................................................213
17.2 Opening the high-voltage door.....................................................................................................................213
17.3 Closing the high-voltage door ......................................................................................................................214
18 Operating the switch-disconnector panel.......................................................................................... 216
18.1 Control elements at the front side of the panel.............................................................................................216
18.2 Position indicators visible on high-voltage door ...........................................................................................217
18.3 Access to compartments..............................................................................................................................217
18.4 Opening the high-voltage door.....................................................................................................................217
18.5 Closing the high-voltage door ......................................................................................................................219
18.6 Operating the switch-fuse combination to CLOSED position.......................................................................221
18.7 Operating the switch-disconnector to OPEN position ..................................................................................224
18.8 Operating lever for earthing switch ..............................................................................................................226
18.9 Earthing the feeder manually.......................................................................................................................227
18.10 De-earthing the feeder manually..................................................................................................................230
18.11 Replacing HV HRC fuse-links......................................................................................................................233
19 Operating the removable voltage transformers................................................................................ 239
19.1 Control elements on the door to the voltage transformer compartment .......................................................239
19.2 Opening the door to the voltage transformer compartment..........................................................................239
19.3 Closing the door to the voltage transformer compartment ...........................................................................241
19.4 Racking the removable voltage transformers to service position.................................................................242
19.5 Racking the removable voltage transformers to test position.......................................................................246
19.6 Taking the removable voltage transformers out of the panel.......................................................................249
19.7 Inserting the removable voltage transformers in a panel .............................................................................253
19.8 Replacing protection fuse-links....................................................................................................................258
20 Verifying safe isolation from supply .................................................................................................. 265
20.1 Application of voltage indicators...................................................................................................................265
20.2 Overview of voltage indicating systems .......................................................................................................265
20.3 LRM system overview..................................................................................................................................266
20.4 Verifying proper functioning of LRM-ST voltage indicator............................................................................267
20.5 Verifying safe isolation from supply with the LRM device system................................................................268
20.6 CAPDIS and VOIS systems overview..........................................................................................................269
20.7 Verifying safe isolation from supply with the CAPDIS or VOIS device system.............................................272
20.8 Supplier information.....................................................................................................................................272
21 Earthing and de-earthing the busbar system.................................................................................... 273
21.1 Earthing the busbar system manually..........................................................................................................273
21.2 De-earthing the busbar system manually.....................................................................................................278
22 Operating the shutters......................................................................................................................... 283
22.1 Operating the shutter to the busbar compartment in the switching-device compartment.............................283

Content
110-0134.9 / 14 NXAIR / ≤40 kA 7
22.2 Operating the shutter to the connection compartment in the switching-device compartment......................286
22.3 Operating the shutter to the busbar compartment in the contactor panel with panel width 435 mm............289
22.4 Operating the shutter to the connection compartment in the contactor panel with panel width 435 mm......293
23 Accessing the connection compartment through the front .............................................................298
23.1 Preparations before accessing the connection compartment ......................................................................298
23.2 Accessing the connection compartment through the switching-device compartment..................................302
23.3 Installing the vertical partition in the switching-device compartment............................................................307
23.4 Accessing the connection compartment through the switching-device compartment at panel versions
with ventilation system type I.......................................................................................................................313
23.5 Installing the vertical partition and the ventilation duct type I in the switching-device compartment ............318
23.6 Accessing the connection compartment through the switching-device compartment at panel versions
with ventilation system type II......................................................................................................................324
23.7 Installing the vertical partition and the ventilation duct type II in the switching-device compartment ...........329
23.8 Accessing the connection compartment through the switching-device compartment at panel versions
with voltage transformer compartment.........................................................................................................333
23.9 Installing the bushing plate, the vertical partition and the voltage transformer compartment in the
switching-device compartment.....................................................................................................................339
24 Accessing the connection compartment through the rear...............................................................347
24.1 Accessing the connection compartment through the rear side of the panel.................................................347
24.2 Installing the rear wall on the connection compartment...............................................................................353
24.3 Accessing the connection duct through the rear side of the panel...............................................................359
24.4 Installing the rear walls on the connection duct...........................................................................................362
25 Key-operated interlocks .......................................................................................................................365
25.1 Key-operated interlocks for the withdrawable part / switching-device truck.................................................365
25.2 Key-operated interlocks for the busbar earthing switch...............................................................................368
26 Fitting the earthing device ...................................................................................................................370
26.1 Design, application and inspection of the earthing device accessories .......................................................370
26.2 Connecting the earthing device ...................................................................................................................371
26.3 Removing the earthing device .....................................................................................................................378
27 Panels with motor operating mechanism control..............................................................................382
27.1 Overview of functionality..............................................................................................................................382
27.2 Opening the control door .............................................................................................................................386
27.3 Closing the control door...............................................................................................................................387
27.4 Selecting manual operation for racking........................................................................................................388
27.5 Selecting electrical operation for racking .....................................................................................................390
27.6 Selecting interlocking...................................................................................................................................391
27.7 Racking the withdrawable circuit-breaker / circuit-breaker truck to service position manually.....................394
27.8 Racking the withdrawable circuit-breaker / circuit-breaker truck to service position electrically...................397
27.9 Racking the withdrawable circuit-breaker / circuit-breaker truck to test position manually...........................398
27.10 Racking the withdrawable circuit-breaker / circuit-breaker truck to test position electrically........................402
27.11 Opening the circuit-breaker manually..........................................................................................................403
27.12 Closing the circuit-breaker manually............................................................................................................404
27.13 Charging / discharging the spring energy store manually............................................................................405
27.14 Earthing / de-earthing the feeder manually..................................................................................................407
27.15 Earthing / de- earthing the feeder electrically...............................................................................................409
27.16 Earthing / de-earthing the busbar system manually.....................................................................................410
27.17 Earthing / de- the busbar system electrically ...............................................................................................410
27.18 Further operating options.............................................................................................................................411
27.19 Technical data / operating times..................................................................................................................412
27.20 Fault indication and fault evaluation.............................................................................................................413
28 Panel heater...........................................................................................................................................414
28.1 Heater versions............................................................................................................................................414
28.2 Mechanical temperature controllers.............................................................................................................414
28.3 Electronic temperature and humidity controller............................................................................................415
28.4 Applications for temperature controller ........................................................................................................415
29 Service information...............................................................................................................................417
29.1 Maintenance................................................................................................................................................417
29.2 Time schedule for maintenance measures..................................................................................................417
29.3 Visual inspection..........................................................................................................................................418
29.4 Preventive maintenance ..............................................................................................................................419
29.5 Lubricants to be used ..................................................................................................................................421
29.6 Overpressure monitors (optional), function test...........................................................................................422
29.7 Maintenance of fan(s) for forced ventilation.................................................................................................425
29.8 Switchgear extension...................................................................................................................................425

Content
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29.9 Spare part orders.........................................................................................................................................425
29.10 Replacement of panels and components.....................................................................................................425
29.11 Disposal.......................................................................................................................................................426
30 Trouble shooting.................................................................................................................................. 427
30.1 Panels with withdrawable part......................................................................................................................427
30.2 Panels with switching-device truck...............................................................................................................429
30.3 Panels with switch-fuse combination ...........................................................................................................431
31 Index ...................................................................................................................................................... 432
Document information:
Title: Operating Instructions
Order number: 110-0134.9
Additional order number: 8BX3300-0LA00-0AB1
Revision: 14
Issue: January 2019

110-0134.9 / 14 NXAIR / ≤40 kA 9
General instructions
2 General instructions
2.1 General instructions
Independently of the safety instructions given in these Operating Instructions, the local laws, ordinances,
guidelines and standards for operation of electrical equipment as well as for labor, health and environmental
protection apply.
Absolutely observe the following:
•The personnel must read and understand these Operating Instructions before starting to work.
•Observe all safety instructions and warnings in these Operating Instructions, and follow the
instructions.
•Store these Operating Instructions carefully, and so that it is accessible to the personnel at any
time.
•These Operating Instructions are a part of the product. When the switchgear is transferred, supply
these Operating Instructions as well.
•For questions about these Operating Instructions, please contact the regional Siemens
representative.
Any kind of modification on the product or alteration of the product must be coordinated with the manufacturer
in advance. Non-coordinated modifications or alterations can cause the expiration of warranty claims, and
cause danger to life, limb and other legally protected interests. The fulfillment of the type tests
(according to IEC 62271 Part 200) may not be guaranteed anymore. This applies especially though not
exclusively to the following actions:
•Original Siemens spare parts were not used.
•Service technicians performing replacement were not trained and certified by Siemens.
•Parts were fitted or adjusted incorrectly.
•Settings were not made in accordance with Siemens specifications.
•After installation and setting, no final check was performed by a service technician approved by
Siemens, including documentation of the test results.
•Maintenance was not done according to the Operating Instructions of the Siemens products.
The edition of the standard is only mentioned in the test report applicable at the time of switchgear
manufacture.
These Operating Instructions should be used jointly with the Operating Instructions for circuit-breaker type
3AE and/or Operating Instructions for contactor type 3TL and 3TM.
2.2 Five Safety Rules of Electrical Engineering
The Five Safety Rules of Electrical Engineering must generally be observed during operation of the products
and components described in these Operating Instructions:
•Isolate.
•Secure against reclosing.
•Verify safe isolation from supply.
•Earth and short-circuit.
•Cover or barrier adjacent live parts.
2.3 Hazardous substances
If hazardous substances are required to perform the work, the relevant safety data sheets and operating
instructions must be observed.

General instructions
10 NXAIR / ≤ 40 kA 110-0134.9 / 14
2.4 Personal protective equipment (PPE)
For switchgear with proven internal arc classification according to IEC 62271 Part 200, no protective
equipment is required for operation the switchgear.
To work on switchgear where covers have to be removed, personal protective equipment has to be worn
for protection against hot gases exhausting in case of internal arc and protection against sharp edges.
To select the protective equipment, the national standards and specifications of the corresponding
authorities and professional associations must absolutely be observed.
The protective equipment consists of:
•Protective clothing such as bib overall and long-arm jacket from NOMEX material
(see Internet: NOMEX work clothes)
•Safety shoes
•Gloves
•Helmet and face protection
•Ear protection
2.5 Due application
The air-insulated medium-voltage switchgear type NXAIR is a type-tested and metal-clad switchgear for
indoor installation, with type of accessibility A and internal arc classification (IAC): IAC A FLR ≤40 kA 1 s or
IAC A FL ≤40 kA 1 s according to IEC 62271 Part 200.
The switchgear can be used as indoor installation according to IEC 61936 (Power Installations exceeding
AC 1 kV) in lockable electrical service locations. A lockable electrical service location is a room or a place
that is exclusively used for operating electrical equipment and which is kept under lock and key. Access to
such a room is restricted to skilled electricians.
In the basic version, the degree of protection of the enclosure of NXAIR medium-voltage switchgear is
IP3XD according to IEC 60529.
When the switchgear is operated within the technical parameters defined in these instructions, the air-
insulated switchgear type NXAIR is suitable for rated voltages up to and Ur ≤17.5 kV and a maximum rated
short-time withstand current of Ik = 40 kA.
The circuit-breaker to be used in a circuit-breaker panel depending on the panel version must only be either
the Siemens type 3AE1 or 3AE5.
The air-insulated medium-voltage switchgear type NXAIR is suitable for operational switching of AC circuits
in transformer substations of public power supply systems or in industrial plants.
The medium-voltage switchgear NXAIR is available with the following panel types:
•Circuit-breaker panel
•Disconnecting panel
•Metering panel
•Contactor panel
•Busbar current metering panel
•Bus sectionalizer
•Busbar connection panel
•Switch-disconnector panel
2.6 Qualified personnel
Qualified personnel in accordance with these Operating Instructions are persons who are familiar with
operation and maintenance of the product and have appropriate qualifications for their work.
Furthermore, qualified personnel must have the following training and instruction or authorization:
•Training and instruction or authorization to switch on, switch off, earth and identify power circuits
and equipment / systems as per the relevant safety standards
•Training and instruction regarding the applicable specifications for the prevention of accidents and
the care and use of appropriate safety equipment
•Training in first aid and behavior in the event of possible accidents

General instructions
110-0134.9 / 14 NXAIR / ≤40 kA 11
2.7 Update of the firmware of protection relays
NOTICE
Old firmware versions
If the firmware of the protection relays is not updated, it is theoretically possible for
third parties to access the protection relay through the Internet due to a weak point
in the firmware of the protection relays.
Verify the latest version of the firmware of the protection relays on the
specified website.
Update the firmware of the protection relays with the latest firmware
version.
Siemens protection relays are monitored for their firmware vulnerability. In case that any potential weak
points are identified, which might allow third parties to access to the protection relay, information concerning
this will be distributed by newsletter.
Please visit below website to register to the SIPROTEC and SICAM security update report to receive latest
news.
•www.siemens.com/gridsecurity
Before commissioning, please ensure that the firmware of protection relays is up-to-date.
For latest firmware version for Siemens devices, please visit the website below.
•http://w3.siemens.com/smartgrid/global/en/products-systems-
solutions/downloads/Pages/Overview.aspx
For protection relays of other manufacturers, please contact the Original Equipment Manufacturer.

110-0134.9 / 14 NXAIR / ≤40 kA 12
Features
3 Features
The air-insulated medium-voltage switchgear type NXAIR has the following features:
•Factory-assembled, type-tested, metal-enclosed and metal-clad switchgear for indoor installation
•Type of accessibility A
•Internal arc classification (IAC): IAC A FLR ≤40 kA 1 s or IAC A FL ≤40 kA 1 s according to
IEC 62271 Part 200
•Loss of service continuity category: LSC 2B (metal-clad) and LSC 2A (swtich-disconnector panel)
•Partition class: PM (metallic partition) and PI (shutter made of insulation material for switch-
disconnector panel)
•All switching operations can be carried out at the panel front with the high-voltage door closed
•Standard degree of protection IP3XD for the metal enclosure according to IEC 60529
•Metallic, positively driven shutters protect against accidental contact with live parts inside the panel
•Logical interlock between actuation, circuit-breaker, switch-fuse combination, disconnecting function
and feeder earthing switch operating mechanism prevent maloperation
•Earthing of feeders by means of earthing switches with short-circuit making capacity
•Mechanical position indicators for the withdrawable part / switching-device truck and the feeder
earthing switch integrated in the mimic diagram at the panel front
•Enclosure made of galvanized sheet steel
•Front doors and lateral switchgear end walls are powder-coated with resistant epoxy resin material
•Individual modular compartments in solid-wall design
•Modular compartments bolted together
Further information to design features and design options is given in catalog HA 25.71.

13 NXAIR / ≤ 40 kA 110-0134.9 / 14
Technical data
4 Technical data
4.1 Complete switchgear
Rated voltage
[kV]
7.2
12
17.5
Rated frequency
[Hz]
50/60
50/60
50/60
Rated power-frequency
withstand voltage
[kV]
20
1)
28
1)
38
Rated lightning impulse
withstand voltage
[kV]
60
75
95
Rated short-time withstand current, max.
[kA]
40
40
40
Rated duration of short circuit, max.
[s]
3
3
3
Rated peak withstand current
[kA]
100/104
100/104
100/104
Rated voltage
[kV]
7.2
12
17.5
Rated normal current of busbar, max.
[A]
4000
4000
4000
Rated normal current of feeders, max.
with circuit-beaker
[A]
4000
4000
4000
with disconnector
[A]
4000
4000
4000
with contactor
[A]
400
2)
400
2)
400
2)
with switch-fuse combination
[A]
200
2)
200
2)
200
2)
as bus sectionalizer
[A]
4000
4000
4000
1) Available as special version: 32 kV at 7.2 kV, or, except for contactor, 42 kV at 12 kV
2) Depending on rated current of installed HV HRC fuse-links
4.2 Basic prescriptions and standards
The indoor switchgear complies with the following prescriptions and standards:
IEC / EN standard
Switchgear
62271-1
62271-200
Switching devices
Circuit-breakers
62271-100
Contactors
60470
Disconnectors / earthing switches
62271-102
Switch-fuse combination
62271-105
Current limiting fuses
60282-1
Voltage detecting systems
61243-5
Insulation
60071-1
Degree of protection
60529
Instrument
transformers
Current transformers
61869-2
Voltage transformers
61869-3
Installation, erection
61936-1

Technical data
14 NXAIR / ≤ 40 kA 110-0134.9 / 14
4.3 Electromagnetic compatibility –EMC
The a.m. standards as well as the "EMC Guide for Switchgear" 1) are applied during design, manufacture
and erection of the switchgear. Installation, connection and maintenance have to be performed in
accordance with the stipulations of the operating instructions. For operation, the legal stipulations applicable
at the place of installation have to be observed additionally. In this way, the switchgear assemblies of this
type series fulfill the basic protection requirements of the EMC Guide.
The switchgear operator / owner must keep the technical documents supplied with the switchgear throughout
the entire service life, and keep them up-to-date in case of modifications of the switchgear.
1) Dr. Bernd Jäkel, Ansgar Müller; Medium-Voltage Systems - EMC Guide for Switchgear
4.4 Rating plates
Each panel has a rating plate fixed on the inside of the doors to the high-voltage and low-voltage
compartment containing the following information:
Fig. 1: Rating plate, as an example
(1)
Switchgear type
(5)
Number of operating instructions for the panel
(2)
Serial number
(6)
Year of manufacture
(3)
Technical data
(7)
Panel number
(4)
Internal arc classification
(8)
Loss of service continuity category, partition class
The block-type current transformers and the voltage transformers have their own type plates. A copy is
provided on the inside of the high-voltage door.
4.5 IAC classification
The data (see fig. 1) describes the internal arc classification of the panel according to IEC 62271-200.
The entries IAC A FLR 25 kA 1 s and accessibility type A in the example shown mean:
•IAC: Internal Arc Classification
•F: Internal arc classification for the front side (Front)
•L: Internal arc classification for the lateral sides (Lateral)
•R: Internal arc classification for the rear side (Rear)
•25 kA: Tested short-circuit current
•1 s: Test duration
•A: Type of accessibility A; for authorized personnel only
The IAC classification is referred to each panel. The data on the rating plate (see fig. 1) describes the areas
classified for the corresponding panel.
1
2
3
4
5
6
7
8

Technical data
110-0134.9 / 14 NXAIR / ≤40 kA 15
4.6 Panel dimensions
Width
Panel type
Dimension [mm]
Ik≤31.5 kA
Ik= 40 kA
Ir [A]
Busbar version
≤2500 A
Busbar version
3150/4000 A
Busbar version
≤4000 A
Circuit-breaker
panel
≤1000
600
600
─
1000
─
─
800
1250
800
800
800
2000
800
800
800
2500
1000
1000
800, 1000
3150
─
1000
800, 1000
4000
─
1000
1000
Disconnecting
panel
1250
800
800
800
2000
800
800
800
2500
1000
1000
800, 1000
3150
─
1000
800, 1000
4000
─
1000
1000
Bus sectionalizer
1250
2 ×800
─
2 ×800
2500
2 ×1000 or
─
2 ×1000 or
1 ×1000 with
1 ×800
1 ×1000 with
1 ×800
3150
─
2 ×1000
2 ×1000
4000
─
2 ×1000
2 ×1000
Busbar connection
panel
≤2500
800
800
800
3150
─
1000
1000
4000
─
1000
1000
Metering panel
─
800
800
800
Contactor panel
400
435 1)
435 1)
435 1)
400
600 2)
600 2)
600 2)
Switch-
disconnector panel
200
800
800
─
200
800
800
─
200
800
800
─
200
800
800
─
1) Contactor panel version with rated voltage 7.2 kV or 12 kV
2) Contactor panel version with rated voltage 7.2 kV

Technical data
16 NXAIR / ≤ 40 kA 110-0134.9 / 14
Height
Panel type
Dimension [mm]
Ik≤31.5 kA
Ik= 40 kA
Busbar version
≤2500 A
Busbar version
3150/4000 A
Busbar version
≤4000 A
With standard low-voltage compartment
2300
With high low-voltage compartment
2350
With pressure relief duct and arc absorber
2500
With natural ventilation
2300
With forced ventilation
─
2450
With additional compartment for busbar
components
2350
Depth
Panel type
Dimension [mm]
Ik≤31.5 kA
Ik= 40 kA
Ir [A]
Panel width
[mm]
Busbar version
≤2500 A
Busbar version
3150/4000 A
Busbar version
≤4000 A
Circuit-breaker,
disconnecting,
bus sectionalizer,
busbar connection,
metering panel
≤2500
─
1350 or 1500
1500
1500
3150
─
─
1540 or 1650
1540 or 1650
4000
─
─
1540 or 1650
1540 or 1650
Rear duct version
≤ 4000
Panel version with rear duct is extended by 600 mm
Contactor panel
400
435
1400
1500
1500
400
600
1350
1500
1500
Switch-
disconnector panel
200
800
1350
1500
─

Technical data
110-0134.9 / 14 NXAIR / ≤40 kA 17
4.7 Room planning
According to chapter 5 in the Installation Instructions with order number: 110-0084.9
4.8 Operating conditions
NXAIR switchgear is designed for normal indoor operating conditions according to IEC 62271-1.
In this respect, the following limit values for the ambient air temperature must be complied with:
Limit value
Temperature [ºC]
Maximum value
+40*
Minimum value
−5*
Maximum value of 24-hour mean
+35*
The site altitude is maximum 1000 m above sea level as a standard level.
When NXAIR switchgear is used in regions with high air humidity or considerable temperature fluctuations,
there is risk of condensation. The formation of condensation should be an exception under normal operating
conditions. To prevent condensation, rusting or other serious consequences, the associated preventive
measures must be taken by installing electrical heating equipment in the switchgear. The ambient air must
not be significantly polluted by dust, smoke, corrosive and/or flammable gases, vapors or salt.
* If NXAIR is used under other service conditions than normal service conditions acc. to IEC 62271 Part 1
regarding the ambient air temperature, the permissible current ratings of feeder and busbar can deviate. In
this case please contact the regional Siemens representative to clarify permissible current values.
4.9 Vacuum circuit-breaker type 3AE
The vacuum circuit-breakertype 3AE is a 3-pole indoor circuit-breakerfor ratings from 7.2 kV to 17.5 kV.
Available circuit-breakers type 3AE depending on the design of the NXAIR switchgear:
Fig. 2: 3AE1 circuit-breaker
Fig. 3: 3AE5 circuit-breaker
A rating plate (1) is provided on the operating mechanism unit of every circuit-breaker type 3AE.

Technical data
18 NXAIR / ≤ 40 kA 110-0134.9 / 14
4.10 Operating instructions for circuit-breaker type 3AE
For circuit-breakers type 3AE, separate operating instructions are available with detailed instructions and
information. The operating instructions are supplied as standard with every circuit-breaker type 3AE.
Additional operating instructions in different languages can be ordered at the regional Siemens
representative.
Fig. 4: Operating instructions for circuit-breakertype 3AE
Available operating instructions for circuit-breaker type 3AE:
Language
Order number of operating instructions
German
9229 0001 100 0F
Polish
9229 0001 155 0F
Russian
9229 0001 156 0F
Italian
9229 0001 172 0F
English
9229 0001 176 0F
French
9229 0001 177 0F
Spanish
9229 0001 178 0F
Portuguese
9229 0001 179 0F
Romanian
9229 0001 302 0F
4.11 Contactor type 3TL and 3TM
The vacuum contactor type 3TM3 is a 3-pole indoor contactor for ratings from 7.2 kV to 12 kV.
The vacuum contactor type 3TL8 is a 3-pole indoor contactor for ratings of 7.2 kV.
Available contactors type 3TL and 3TM depending on the design of the switchgear:
Panel width
[mm]
Rated voltage Ur
[kV]
3TM3
435
7.2
12
3TL8
600
7.2

Technical data
110-0134.9 / 14 NXAIR / ≤40 kA 19
A rating plate (1) is provided on the operating mechanism unit of every contactor type 3TL and 3TM.
Fig. 5: Contactor truck type 3TM3
Fig. 6: Contactor truck type 3TL8
4.12 Operating instructions for contactor type 3TL8 and 3TM3
For contactors type 3TL8 and 3TM3, separate operating instructions are available with detailed instructions
and information. The operating instructions are supplied as standard with every contactor type 3TL and 3TM.
Additional operating instructions in different languages can be ordered at the regional Siemens
representative.
Available operating instructions for contactor type 3TL and 3TM
Language
Order number of operating instructions
3TL8
German-English
9229 9870 174 0G
French-Spanish
9229 9870 159 0G
Language
Order number of operating instructions
3TM3
English
9229 0090 176 0A
German
9229 0090 100 0A
Russian
9229 0090 156 0A
Polish
9229 0090 155 0A
1

Technical data
20 NXAIR / ≤ 40 kA 110-0134.9 / 14
Fig. 7: Contactor type 3TM3
Fig. 8: Contactor type 3TL8
4.13 Switch-fuse combination typeL-TRI 5F
The switch disconnector-fuse combination type L-TRI 5F with all-pole tripping for the striker pin release of the
HV fuse links meets the specific test conditions of IEC 62271-105.
Fig. 9: Switch-fuse combination type L-TRI 5F
4.14 Operating instructions for switch-fuse combination L-TRI 5F
For switch-fuse combination type L-TRI 5F, separate operating instructions are available with detailed
instructions and information.
For further information about maintenance and servicing, please refer to the operating instructions indoor
switch-fuse combination L-TRI5. Operating instructions can be ordered at the regional Siemens
representative.
Language
Order number of operating instructions
L-TRI 5F
English
AGS531883-01