NXAIR C The Optimum
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NXAIR C The Optimum Air-Insulated Medium-Voltage Switchgear Catalog HA 25.81 Edition 2020

Possibilities of application Requirements and solutions for the industrial sectors Characteristics Features Safety Technology Room planning Standards Circuit-breaker panel Disconnecting panel Bus sectionalizer – circuit-breaker panel Bus sectionalizer – bus riser panel Switch-disconnector panel Metering panel Busbar connection panel NXAIR C The Optimum – Air-Insulated Medium-Voltage Switchgear Siemens AG | HA 25.8

Requirements and solutions for the industrial sectors General requirements of the applications • Reliable power supply • High number of operating cycles • Maximum availability • Space-saving panels • Protection of small distribution ransformers t • Setup of billing metering systems • Protection of the switchgear room from the effects of an internal arc • Fire protection Solution with NXAIR C • Through SION-type vacuum circuit-breakers with up to 30,000 operating cycles • No handling of insulating gas; no pressure monitoring • Factory-assembled, type-tested switchgear • Compact design...

Features Features Room planning Increased productivity A high level of operational reliability through: • Partition class PM (PI for switch-disconnector) • Use of standardized instrument transformers • Cable testing without isolating the busbar • Use of maintenance-free switching devices • Control cables in metallic wiring ducts • Easy access to all panel components. Digitally enhanced The use of digitally enabled secondary systems and combined protection/control devices make NXAIR C able to: Compact design Thanks to the ingenious design – with a panel depth starting from 1025 mm and a...

Safety Features Room planning Switchgear type NXAIR C is approved with internal arc classification IAC A FLR, loss of service continuity category LSC 2A, and partition class PM.* This makes it a suitable product for high requirements regarding personal safety. Personal safety • All operations with closed high-voltage door • Safe-to-touch 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 • Unambigious position indicators and control...

Technology Features Room planning General • Air as insulating medium; always available and absolutely neutral to the environment • Make-proof earthing switch • Maintenance-free circuit-breakers • Wall-standing or free-standing arrangement • Comfortable cable connection access from front • Integrated mimic diagram on high-voltage door with display of the respective a) switch positions for circuit-breaker and switch-disconnector b) service and disconnected positions of the withdrawable parts c) position of the earthing switch • Unambiguous assignment of actuating openings and control elements...

Technology Features Room planning Sensors To prevent the effects of the thermal phase and to significantly reduce the gas discharge by shortening the effective arc duration, NXAIR C is optionally equipped with: • Option 1 – Light sensitive sensors for immediate detection of an internal arc, in combination with overcurrent sensing • Option 2 – Pressure sensors for immediate detection of an internal arc. Low-voltage compartment • Customary protection, measuring and control equipment • Option: Numerical multifunction protection relay with integrated protection, control, communication,...

Room planning Features Room planning 12 kV pressure relief inside switchgear room 24 kV pressure relief inside switchgear room 12 kV pressure relief outside switchgear room 24 kV pressure relief outside switchgear room Switchgear installation • For single-busbar applications: ‒ Wall-standing arrangement ‒ Free-standing arrangement. Room and door dimensions See dimension drawings above. 4 Aisle for panel replacement 2 1250 mm including LV compartment 3 Aisle for operating in front of the switchgear Weights 12 kV panels:  600 mm: approx. 475 kg 12 kV panels:  800 mm: approx. 560 kg 24 kV...

Features Safety Technology Overview of applicable standards The switchgear complies with the relevant standards and specifications applicable at the time of type tests. 1) Secondary devices (e.g. protection devices, meters, measuring transducers, etc.) must be suitable for the given operating conditions 2) Heater in the low-voltage compartment and operating mechanism box of the circuit-breaker NXAIR C The Optimum - Air-Insulated Medium-Voltage Switchgear Siemens AG | HA 25.81 | 2020

Circuit-breaker panel Overview Circuit-breaker panel Disconnecting panel Bus sectionalizer -circuit-breaker panel Technicai data (O Switch-disconnector panel Metering panel Busbar connection panel Front view Circuit-breaker panel Rated voltage Ur Frequency Rated normal current of feeders I r Rated short-time withstand current I k for rated duration of short circuit t. = 1 s and 3 s k Rated peak withstand current Ip Rated short-circuit making current I Rated short-circuit breaking current Isc Rated lightning impulse withstand voltage Up Rated short-duration power-frequency withstand voltage...

Circuit-breaker panel Overview Circuit-breaker panel Disconnecting panel Bus sectionalizer -circuit-breaker panel Bus sectionalizer -bus riser panel Technical data Switch-disconnector panel Metering panel Busbar connection panel Side view Configuration Busbar compartment ;; HK Cable / instrument transformer compartment Make-proof Capacitive voltage busbar earthing detecting system switch Circuit-breaker Reserve unit withdrawable prepared for vacuum unit circuit-breaker Cable connection Voltage Capacitive Current transformer voltage detecting transformer Make-proof earthing switch Surge...