12kV Sf6 Free Ring Main Unit Air Insulated Switchgear Eco Friendly Environment Protection

Overview 

The air insulated switchgear (AIS) redefines eco-friendly power distribution for 12kV three-phase AC systems. This sf6 free switchgear replaces harmful greenhouse gases with zero-grade dry air or 99.99% pure nitrogen, achieving a material recycling rate exceeding 90%. Furthermore, this medium voltage switchgear design combines a compact footprint with strong environmental adaptability for both indoor and outdoor deployment. As a result, this ring main unit delivers maintenance-free, intelligent, and environmentally responsible distribution across a wide range of industrial and urban applications.

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Product Features

• Zero-Emission Insulation:This mv switchgear replaces SF6 entirely with dry air or nitrogen, requiring no gas recovery treatment after leakage.

• IP67 Stainless Steel Enclosure:The 2.5mm-thick laser-welded stainless steel shell gives this metal enclosed switchgear outstanding corrosion resistance and reliable sealing performance.

• Maintenance-Free Vacuum Technology:Every electrical switchgear unit uses vacuum arc-extinguishing technology, with all conductive parts sealed inside the gas tank for minimal maintenance.

• Five-Prevention Interlocking:The mv panel operation room integrates a complete five-prevention mechanical interlock system, preventing all common operator errors.

• Modular Flexible Configuration:This electrical rmu supports free combination of circuit breaker and load switch modules via dedicated busbar connectors to fit any project layout.

• Smart Grid Integration:Each medium voltage rmu ships with a digital relay protection device and optional toroidal current transformers for distribution automation compatibility.

• Compact Space-Saving Design:The explosion-proof diaphragm and three-position switch design make this ring main unit ideal for space-constrained urban distribution environments.

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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)
Item			Unit	Parameter
Rated   voltage			kV	12
Rated   frequency			Hz	50
Rated insulation level	1min   power frequency withstand voltage	Phase-to-ground,   phase-to-phase	kV	42
		Insulation breaking	kV	48
	Lightning impulse withstand voltage (peak)	Phase-to-ground,   phase-to-phase	kV	75
		Insulation breaking	kV	85
	1min power frequency withstand voltage  (phase-to-ground) of auxiliary/control   circuit		kV	2
Rated current			A	630
Rated   instantaneous withstand current (RMS)		Main   circuit/grounding switch	kA	45/4s
		Grounding circuit	kA	21.7/4s
Rated peak   withstand current		Main   circuit/grounding switch	kA	63
		Grounding circuit	kA	54.5
Rated short-circuit   breaking current and times			kA/Time	25/30
Rated short-circuit   closing current (peak)			kA	63
Rated cable charge   breaking current			A	25
Rated operati ing   sequence of circuit breaker				O-0.3s-C0.180s-CO
Mechanical   life	Circuit breaker/insulation   switch		Time	10000/3000
Protection   grade	Sealed enclosure			IP67
	Switchgear   shell			IP4X
Gas   pressure	Rated gas charge level   (20℃, gauge pressure)		Mpa	0.02
	Minimum   gas function level (20℃, gauge pressure)		Mpa	0
Seal   performance	Annual leak rate		%/Year	≤0.05

Main   technical parameters (Load switchgear)
Item			Unit	Parameter
Rated   voltage			kV	12
Rated   frequency			Hz	50
Rated insulation level	1min   power frequency withstand voltage	Phase-to-ground,   phase-to-phase	kV	42
		Insulation breaking		48
	Lightning impulse withstand voltage (peak)	Phase-to-ground,   phase-to-phase	kV	75
		Insulation breaking		85
	1min power frequency withstand voltage (phase-to-ground) of   auxiliary/control circuit		kV	2
Rated   current			A	630
Rated instantaneous withstand current (RMS)		Main   circuit/grounding switch	kA	25/4s
		Groundingcircuit	kA	21.7/4S
Rated peak withstand current		Main   circuit/grounding switch	kA	63
		Groundingcircuit	kA	54.5
Rated   short-circuit closing current (peak)		Load   switch/grounding switch	kA	63
Rated   active load breaking current			A	630
Rated   closed-loop breakingcurrent			A	630
5%   Rated active load breaking current			A	315
Rated   cable charge breaking current			A	10
Rated   active load breaking times			Time	100
Groundingfault   current breaking			A/Time	31.5/10
Circuit   and cable charge current breaking with grounding fault			A/Time	17.4/10
Mechanical life	Grcuit   breaker/insulation switch		Time	10000/3000
Protection grade	Sealed enclosure			IP67
	Switch gear shell			IP4X
Gas pressure	Rated   gas charge level (20° C, gauge pressure)		Mpa	0.02
	Minimum gas function level (20°C , gauge pressure)		Mpa	0
Seal performance	Annualleak   rate		%/year	≤0.05

Product structure diagram

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

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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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