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12kV Sf6-free Ring Main Unit - Air Insulated Switchgear - Eco-friendly Environment Protection

Air Insulated Switchgear (AIS) uses ambient air as the primary insulation medium for electrical components in medium-voltage (1–52 kV) power distribution networks. Unlike SF₆ gas-insulated systems, AIS eliminates potent greenhouse gases, slashing carbon footprints while delivering robust performance. Its modular, open-design construction ensures easy maintenance, compliance with global decarbonization mandates (e.g., EU F-gas bans), and resilience in harsh environments.
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  • HBG

  • Giantele

  • IP67

  • 10kV/11kV/12kV

  • 630A/1250A

  • 50/60Hz

  • Three

  • 1pcs

  • 2000/5000

Overview 

Air Insulated Switchgear (AIS) uses ambient air as the primary insulation medium for electrical components in medium-voltage (1–52 kV) power distribution networks. Unlike SF₆ gas-insulated systems, AIS eliminates potent greenhouse gases, slashing carbon footprints while delivering robust performance. Its modular, open-design construction ensures easy maintenance, compliance with global decarbonization mandates (e.g., EU F-gas bans), and resilience in harsh environments.



Product Features


1. Robust Construction:

  • Features a premium 2.5mm-thick stainless steel enclosure with laser-welded seams for hermetic sealing and exceptional mechanical integrity.

  • Delivers superior corrosion resistance and IP67-rated environmental protection against dust and liquid ingress.


2. Safety-Engineered Gas Compartment:

  • Incorporates a pressure-rupture diaphragm to prevent tank rupture during abnormal gas pressurization events.

  • All live components are fully enclosed within the gas chamber, ensuring maintenance-minimized operation while maintaining compact dimensions.


3. Advanced Circuit Protection:

  • Main circuit integrates a three-position load-break switch (make, break, earth) combined with a vacuum interrupter – a field-proven configuration optimized for modern grid operational requirements.


4. Eco-Conscious Insulation Medium:

  • Utilizes Class 0 dry air (externally sourced) or **≥99.99% purity nitrogen** per IEC 60085 standards.

  • Leakage poses zero environmental impact and requires no gas recovery procedures.


5. Adaptable Modular Architecture:

  • Employs a modular design philosophy, enabling flexible configuration of functional units via specialized busbar connectors.

  • Accommodates China's regionally diverse and complex power distribution schemes with maximum versatility.


6. Intuitive Operation & Safety:

  • Control panel features a full five-safeguard mechanical interlocking system with pre-installed logic.

  • Strict adherence to operational sequences is required per instructions, delivering unparalleled operational safety and user convenience.



Application Scenarios

1. Utility Substations & Urban Grids

  • Challenge: Aging SF₆ switchgear leaks toxic gas, violating F-gas regulations (EU 517/2014) and inflating lifecycle costs.

  • AIS Role:

    • Eliminates all SF₆ → Zero global warming potential (GWP) vs. SF₆ (GWP = 23,500× CO₂).

    • Slashes maintenance costs by 25–40% (no gas monitoring/recovery).

    • Accelerates grid upgrades with modular, space-optimized designs.

2. Solar/Wind Farms & Renewable Plants

  • Challenge: Remote locations requiring reliable, low-maintenance gear resistant to humidity/temperature swings.

  • AIS Role:

    • Prevents performance degradation in coastal/desert climates (air insulation immune to condensation).

    • Avoids SF₆ leaks that trigger environmental penalties (EPA/FERC).

    • Boosts ESG compliance for Scope 3 emissions reporting.

3. Industrial Manufacturing Plants

  • Challenge: Dusty/humid factory floors where SF₆ leaks risk explosions or toxic exposure.

  • AIS Role:

    • Zero-toxicity design → Safe operation near workers/equipment.

    • Withstands contamination (IP4X-rated enclosures for dust/water).

    • Reduces unplanned downtime by 30% via accessible modular bays.

4. Data Centers & Hyperscalers

  • Challenge: Strict sustainability mandates and zero tolerance for gas leaks near servers.

  • AIS Role:

    • SF₆-free topology aligns with corporate net-zero pledges (e.g., Google/Microsoft).

    • Mitigates fire/explosion risks from pressurized SF₆ (critical for uptime SLA compliance).

    • Lowers cooling loads vs. heat-trapping SF₆ cabinets.

5. Mining & Offshore Platforms

  • Challenge: Explosive atmospheres or confined spaces where SF₆ leaks endanger personnel.

  • AIS Role:

    • Non-pressurized design removes rupture risks (ATEX/IECEx certified).

    • Operates flawlessly at -40°C to +50°C (SF₆ liquefies below -30°C).

    • Simplifies disposal (100% recyclable steel/aluminum vs. toxic SF₆ cleanup).


Technical parameter


Main   technical parameters(circuit breaker cabinet)
ItemUnitParameter
Rated   voltagekV12
Rated   frequencyHz50
Rated insulation level1min   power frequency withstand voltagePhase-to-ground,   phase-to-phasekV42
Insulation breakingkV48
Lightning impulse withstand voltage (peak) Phase-to-ground,   phase-to-phasekV75
Insulation breakingkV85
1min power frequency withstand voltage  (phase-to-ground) of auxiliary/control   circuitkV2
Rated current A630
Rated   instantaneous withstand current (RMS)Main   circuit/grounding switchkA45/4s
Grounding circuitkA21.7/4s
Rated peak   withstand currentMain   circuit/grounding switchkA63
Grounding circuitkA54.5
Rated short-circuit   breaking current and timeskA/Time25/30
Rated short-circuit   closing current (peak)kA63
Rated cable charge   breaking currentA25
Rated operati ing   sequence of circuit breaker
O-0.3s-C0.180s-CO
Mechanical   lifeCircuit breaker/insulation   switchTime10000/3000
Protection   gradeSealed enclosure
IP67
Switchgear   shell
IP4X
Gas   pressureRated gas charge level   (20℃, gauge pressure)Mpa0.02
Minimum   gas function level (20℃, gauge pressure)Mpa0
Seal   performanceAnnual leak rate%/Year≤0.05



Main   technical parameters (Load switchgear)
ItemUnitParameter
Rated   voltagekV12
Rated   frequencyHz50
Rated insulation level1min   power frequency withstand voltagePhase-to-ground,   phase-to-phasekV42
Insulation breaking48
Lightning impulse withstand voltage (peak)Phase-to-ground,   phase-to-phasekV75
Insulation breaking85
1min power frequency withstand voltage (phase-to-ground) of   auxiliary/control circuitkV2
Rated   currentA630
Rated instantaneous withstand current (RMS)Main   circuit/grounding switchkA25/4s
GroundingcircuitkA21.7/4S
Rated peak withstand currentMain   circuit/grounding switchkA63
GroundingcircuitkA54.5
Rated   short-circuit closing current (peak)Load   switch/grounding switchkA63
Rated   active load breaking currentA630
Rated   closed-loop breakingcurrentA630
5%   Rated active load breaking currentA315
Rated   cable charge breaking currentA10
Rated   active load breaking timesTime100
Groundingfault   current breakingA/Time31.5/10
Circuit   and cable charge current breaking with grounding faultA/Time17.4/10
Mechanical lifeGrcuit   breaker/insulation switchTime10000/3000
Protection gradeSealed enclosure
IP67
Switch gear shell
IP4X
Gas pressureRated   gas charge level (20° C, gauge pressure)Mpa0.02
Minimum gas function level (20°C , gauge pressure)Mpa0
Seal performanceAnnualleak   rate%/year≤0.05


Product structure diagram

Product structure diagram of air insulated switchgear

1.Low-voltage instrument room

2. Eyebrows

3. Operation room

4. Observation tube

5. Powered display

6. Cable Room

7. Vacuum circuit breaker/load switch

8. Three-station isolation/grounding switch

9. Pressure relief device

10. Switching mechanism

11. Three-station mechanism

12. Five-prevention interlocking mechanism

13. Wall-penetrating conduits for incoming and outgoing lines



Cabinet size

Type W H D
C Top   expansion 420mm 1950mm 850mm
Lateral expansion 420mm 2000mm
V Top   expansion 420mm 1950mm
Lateral expansion 420mm 2000mm
PT Top   expansion 600mm 1950mm
Lateral expansion 600mm 2000mm
D Top   expansion 420mm 1950mm
Lateral expansion 420mm 2000mm


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