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- Air-Insulated Medium-Voltage Switchgear NXAIR and NXAIR M
Air-Insulated Medium-Voltage Switchgear NXAIR and NXAIR M
Air-Insulated Medium-Voltage Switchgear NXAIR and NXAIR M
The Siemens NXAIR and NXAIR M are air-insulated medium-voltage switchgear systems designed for use in transformer and switching substations, primarily at the primary distribution level. They are suitable for a wide range of applications including public power supply, industry, and offshore installations.
These switchgear systems are used by power supply companies, energy producers, and system operators. They are also applicable in various industries such as automotive, mining, chemical, and petrochemical, as well as in data centers and shipbuilding.
The products are manufactured and distributed under a certified management system compliant with ISO 9001, ISO 14001, and BS OHSAS 18001. They adhere to IEC 62271-200 and VDE 0671-200 standards.
- Ensures Peace of Mind: The platform concept ensures smooth operation, availability, and safety with features like metallic enclosures and earthed shutters.
- Saves Lives: Approved with internal arc classification IAC A FLR, ensuring high personal safety standards.
- Increases Productivity: Features like modular design and maintenance-free components enhance operational reliability and productivity.
- Saves Money: Compact design reduces building costs and maintenance-free components minimize downtime.
- Preserves the Environment: Air as an insulating medium is environmentally neutral, and the materials used are fully recyclable.
The switchgear is factory-assembled, metal-enclosed, and type-tested for indoor installation. It features a basic panel design with integrated mimic diagrams and ergonomic control elements. Interlocks ensure safe operation, and options for electromagnetic interlocks and padlocks are available.
The catalog provides detailed technical data for both NXAIR and NXAIR M, including electrical data, product range, dimensions, and room planning guidelines.
Siemens NXAIR and NXAIR M switchgear systems offer a reliable, safe, and environmentally friendly solution for medium-voltage applications across various sectors, backed by comprehensive certifications and standards compliance.
- Switchgear Design: The switchgear is designed with compartments for switching devices, busbars, and connections, all made from sendzimir-galvanized or cast-resin powder-coated sheet steel. It includes pressure relief mechanisms and metallic shutters for safety.
- Components: Key components include vacuum circuit-breakers, switch-disconnector/fuse combinations, and HV HRC fuses. The switchgear supports various configurations for different operational needs.
- Electrical Ratings: The switchgear supports rated operating voltages up to 24 kV, short-circuit breaking currents up to 50 kA, and normal currents up to 4000 A, depending on the model.
- Three-Position Switch-Disconnector: The switchgear includes a three-position switch-disconnector with positions for CLOSED, OPEN, and EARTHED, ensuring safe operation and maintenance.
- Interlocking Mechanisms: Interlocks are provided to prevent unsafe operations, such as switching from EARTHED to OPEN when the high-voltage door is open.
- Manual and Motor Operations: The switchgear supports both manual and motorized operations for various components, enhancing flexibility and ease of use.
- Compliance: The design complies with IEC 62271-200 and VDE 62271-200 standards, ensuring high safety and reliability.
- Pressure Resistance: The high-voltage doors and partitions are pressure-resistant to handle internal arcs safely.
- Earthing Switch: The earthing switch is make-proof and can be manually or motor-operated, with optional locking mechanisms for added security.
- Capacitive Voltage Detection: Optional coupling electrodes for capacitive voltage detection systems are available.
- Surge Protection: Surge arresters and limiters are included to protect against overvoltages.
- Maintenance-Free: The operating mechanisms are designed to be maintenance-free under normal conditions.
- Switch-Disconnector/Fuse Combination: Rated voltage of 24 kV, short-time withstand current up to 25 kA, and peak withstand current up to 63/65 kA. Endurance class M1, E3 for general-purpose switches and M0, E2 for earthing switches.
- Circuit-Breaker/Fuse Combination: Rated voltage of 24 kV, short-circuit breaking current up to 25 kA, and normal current of the feeder up to 800 A.
- Vacuum Contactor: Suitable for MV motors up to 3 MW, with a rated operating voltage up to 12 kV and short-time withstand current up to 8 kA.
- Current Transformers: Operating voltage up to 24 kV, primary current up to 4000 A, and short-time thermal current up to 50 kA.
- Voltage Transformers: Primary operating voltage up to 24 kV, secondary voltage up to 120 V, and rating up to 200 VA.
- Switch Positions: CLOSED, OPEN, EARTHED, with climate-independent switching elements.
- Maintenance-Free: Operating mechanisms are maintenance-free under normal conditions.
- SIQuench Arc Quenching Device: Reduces pressure and arc energy, preventing damage and allowing fast restart. It operates with a fast mechanical stored-energy spring mechanism.
- Components comply with IEC standards such as IEC 62271-103, IEC 62271-107, and IEC 61869 for transformers.
- HV HRC fuses comply with DIN 43625 and IEC 60282 standards.
- Components can be installed in various configurations, including withdrawable and fixed-mounted options.
- Low-voltage compartments are designed for safe accommodation of protection and control equipment.
- Maximum rated values include 17.5 kV, 50 kA, and 4000 A for various components.
- Short-circuit making and breaking currents are specified for different configurations and frequencies.
- Panel Types and Dimensions: The document lists different panel types including circuit-breaker panels, disconnecting panels, and switch-disconnector panels with HV HRC fuses. Dimensions vary based on rated normal current and short-time withstand current, with specific measurements for width, height, and depth.
- Electrical Data: Maximum values are provided for rated voltage (up to 24 kV), frequency (50/60 Hz), short-circuit breaking current (up to 25 kA), and normal current of busbars and feeders (up to 2500 A).
- Guidelines for pressure relief into and out of the switchgear room are detailed, with specific ceiling height requirements based on short-circuit current levels.
- Recommendations for control aisle and lateral wall distances are provided, adhering to IEC standards for installation, maintenance, and operation.
- Special design considerations for marine and offshore environments include type approvals from DNV-GL and LRS, internal arc classification, and pressure relief mechanisms.
- Features such as degrees of protection (IP31 to IP42), temperature operation range (-5°C to +55°C), and optional temperature supervision tools are highlighted.
- Transport guidelines specify the delivery of switchgear in individual panels, with considerations for transport facilities, dimensions, and weights.
- Packing methods vary by transport mode (rail, truck, ship, airfreight), with specific instructions for protective measures and storage time limits.
Catalog excerpts
Air-Insulated Medium-Voltage Switchgear NXAIR and NXAIR M Medium-Voltage Switchgear
Open the catalog to page 1
Typical applications NXAIR and NXAIR M circuit-breaker switchgear is used in transformer and switching substations, mainly at the primary distribution level, e.g.: Application Public power supply Application Industry and offshore • Automobile industry • Traction power supply systems • Mining industry • Lignite open-cast mines • Chemical industry • Diesel power plants • Electrochemical plants • Emergency power supply installations • Textile, paper and food industries • Iron and steel works • Power stations • Petroleum industry • Offshore installations • Petrochemical plants • Pipeline installations...
Open the catalog to page 2
Air-Insulated Medium-Voltage Switchgear NXAIR and NXAIR M Medium-Voltage Switchgear Catalog HA 25.71 ■ 2019 Invalid: Catalog HA 25.71 ■ 2017 siemens.com/nxair Application Page Customer benefit Ensures peace of mind 4 Basic panel design, operation 10 to 13 Three-position switch-disconnector / fuse combination 19 Circuit-breaker / fuse combination 20 SIQuench arc quenching device 25 Technical data NXAIR Product range, switchgear panels 27 to 29 Technical data NXAIR M Product range, switchgear panels 37 to 39 Standards, specifications, guidelines 44 to 46 The products and systems listed in this...
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Customer benefit Ensures peace of mind For power supply companies and industrial plants, the platform concept of the NXAIR family introduced at all production locations has very concrete advantages: Smooth operation, exemplary availability and optimal safety. Features • No handling of insulating gas and no pressure monitoring required • As insulating medium, air is always available • Factory-assembled, type-tested switchgear according to IEC 62271-200 or VDE 0671-200 • Platform concept introduced worldwide, centrally controlled development, local manufacture • Use of standardized block-type current...
Open the catalog to page 4
Customer benefit Saves lives A ll switchgear types of the NXAIR family are approved with internal arc classification IAC A FLR, loss of service continuity category LSC 2B, and partition class PM. This makes them suitable for universal installation, meeting the highest requirements regarding personal safety. Features • All operations with closed high-voltage door • Metallic enclosure, earthed shutters and partitions • Internal arc classified switchgear according to IAC A FLR (front, lateral and rear accessibility) for all short-circuit currents and an arc duration of 1 s • Loss of service continuity...
Open the catalog to page 5
Customer benefit Increases productivity Properties such as modular design, types tests of the switching devices in the switchgear, confinement of an internal arc to the respective compartment, and thus maximum operational reliability, contribute to optimum operation and a remarkable increase of productivity. Features • Loss of service continuity category LSC 2B • Partition class PM • Maximum degree of protection IP51 possible • Positively driven shutters • Use of standardized block-type current transformers • Cable testing without isolating the busbar • Functions such as establishment of the...
Open the catalog to page 6
Customer benefit Saves money T he compact design of the NXAIR family pays twice for owners due to the use of the new SION circuit- breaker series. On the one hand, building costs can be reduced in this way, and on the other hand, the maintenance-free circuit-breakers and the modular design enable continuous operation without expensive shutdown times. Features • Use of maintenance-free vacuum circuit-breakers or contactors • Maintenance-free within up to 10 years • Interruption of operation reduced to a minimum by logical mechanical interlocking system • Minimized space requirements (reduced building...
Open the catalog to page 7
Customer benefit Preserves the environment Air used as insulating medium, local production locations with short transportation ways and times, as well as a service life of more than 30 years, optimize the total energy balance. Features • As insulating medium, air is absolutely neutral to the environment • Local production presence in all regions, minimized energy consumption (CO2) regarding transport • Service life of more than 30 years optimizes the energy balance additionally • The materials used are fully recyclable without special knowledge • Easy disposal. Air-Insulated Medium-Voltage Switchgear...
Open the catalog to page 8
Circuit-breaker switchgear NXAIR and NXAIR M is factory-assembled, metal-enclosed and type-tested switchgear for indoor installation according to IEC 62271-200/VDE 0671-200 and corresponds to the following classifications. Type approval NXAIR switchgear has been type-approved by the following classification societies: Lloyd's Register DNV GL The switchgear is therefore also approved for application on ships and platforms. National approval GOST By certification in the system GOST R in Russia, NXAIR switchgear is approved for application at the voltage levels up to 12 kV. Compliance with the requirements...
Open the catalog to page 9
Basic panel design, operation - Circuit-breaker panel Basic panel design (example) NXAIR and NXAIR M Features • Integrated mimic diagram • Indication of the respective switch positions, circuit-breaker CLOSED/OPEN, disconnected position, earthing switch CLOSED/OPEN, on the integrated mimic diagram • Unambiguous assignment of actuating openings and control elements to the corresponding position indicators • All switching operations can only be performed with closed high-voltage door • Ergonomically favorable height for all control and indicator elements • Option: Verification of safe isolation...
Open the catalog to page 10
Basic panel design, operation – Circuit-breaker panel Basic panel design (example) – Duplex (back-to-back) NXAIR and NXAIR M 1 Door to low-voltage compartment 2 Protection device 3 ption: Capacitive voltage detecting O system for feeder and busbar 4 High-voltage door 5 Handle for high-voltage door 6 Mimic diagram 7 "CLOSED-OPEN" actuating openings for the circuit-breaker, opening for spring charging 8 Inspection window to recognize the "CLOSED-OPEN" indicator of the circuit-breaker, "closing spring charged" indicator, operations counter 9 Actuating opening for racking the switching device 10...
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