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

Overview 

Solid Insulated Switchgear (SIS) replaces traditional gas insulation with epoxy-resin-encapsulated components, eliminating greenhouse gases while delivering superior performance in 12–40kV networks. By embedding live parts in maintenance-free solid dielectric, SIS achieves ultra-compact dimensions, immunity to environmental contaminants, and >30-year lifecycle reliability. Compliant with IEC 62271 standards, it’s the go-to solution for decarbonizing power infrastructure without compromising safety or space efficiency.

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Product Features

1. Hermetically Sealed Insulation System:

• High-voltage load switch and live components are encapsulated within epoxy resin insulating enclosures, achieving complete gas-free operation.

• Vacuum interrupter technology ensures reliable arc extinction within a space-optimized design.

2. Three-Position Switching Mechanism:

• Integrated load switch features a three-position (Make-Break-Earth) mechanism with grounding functionality.

• The earthing blade serves dual-purpose as an isolation barrier.

3. Modular Connectivity & Sealing Integrity:

• Units support modular expansion via three-pole shielded solid-insulated bushings per circuit for cable termination.

• Engineered sealed housings (import-grade) ensure hermetic integrity at mechanism-bushing interfaces.

4. Advanced Dielectric Construction:

• Bushings and insulation cylinders utilize imported cycloaliphatic epoxy resin, fabricated via Automated Pressure Gelation (APG) technology.

• Silicone rubber sleeves provide compression sealing between insulation cylinders and high-voltage bushings.

5. Safety-Integrated Operating Systems:

• Each circuit features dedicated front-mounted operating mechanisms with comprehensive mechanical interlocks.

• Spring-operated mechanisms drive both load switch (manual/electric operation) and earthing/isolation switch (manual-only).

6. Circuit Breaker Options:

• Configurable with permanent magnet actuators (PMA):

• Electric closing/opening

• Manual tripping only (no manual closing)

• Spring-operating mechanism alternative:

• Manual/electric operation

• Pre-wired terminal block for distribution automation integration

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Application Scenarios

1. Urban Distribution Substations & Compact Secondary Stations

• Challenge: Space-constrained city centers needing SF₆-free gear to meet air quality mandates (e.g., London LEZ).

• SIS Role:

• Zero-gas design eliminates F-gas reporting/taxes (EU 517/2014).

• 40% smaller footprint vs. AIS enables installations in basements/car parks.

• IP67-rated solid barriers prevent flashovers in polluted/damp environments.

2. Hyperscale Data Centers & Edge Computing Sites

• Challenge: Strict PUE targets and zero-tolerance for SF₆ leaks near critical IT loads.

• SIS Role:

• SF₆-free insulation aligns with RE100 commitments (Google/Amazon).

• Fire-resistant epoxy (V0-rated) eliminates arc-flash propagation risks.

• -40°C to +65°C operation ensures stability in server-farm microclimates.

3. Heavy Industrial Plants (Steel/Mining/Chemical)

• Challenge: Conductive dust/corrosive vapors degrading conventional switchgear.

• SIS Role:

• Hermetically sealed modules block salt, sulfide, and metal particulates.

• Seismic resilience (IEC 62271-3 Class 2) for vibration-heavy zones.

• No SF₆ gas monitoring → 35% lower OPEX vs. GIS.

4. Port Electrification & Offshore Renewables

• Challenge: Salt spray/100% humidity triggering insulation failures.

• SIS Role:

• Corrosion-proof encapsulation survives ISO 9227 salt-mist testing.

• Pressurization-free design avoids explosions at sea level/altitude.

• Shock/vibration resistance for floating solar/wind installations.

5. Hospitals & Tunnel Power Networks

• Challenge: Vital infrastructure needing fire-safe, non-toxic gear.

• SIS Role:

• Zero-toxicity decomposition (even during arc faults).

• Limited ventilation compatibility for underground deployments.

• Passive cooling operation removes HVAC dependency.

Technical parameter

Item		Unit	Data
Rated voltage		kv	12
Rated current		A	630
Rated short-time withstand current (4s)		kA	25
Rated peak withstand current		kA	50
Rated short-circuit closing current (peak)		kA	50
Rated active load breaking current		A	630
Rated closed loop breaki ng current		A	630
Rated cable charge breaking current		A	10
Rated breaking transfer current of combined appliances		A	3700
1 min power frequency withstand   voltage	Phase-   to-phase, phase -to- ground, vacuum breaking	kv	42
	Insulation breaking	kv	48
Lightning impact withstand voltage	Phase-   to-phase, phase -to- ground, vacuum breaking	kV	75
	Insulation breaking	kv	85
Mechanicallife	Circuit breaker	Time	10000
	Insulation knife, grounding knife	Time	3000
Protection grade			IP4X
Shell protection grade			IP4X
Partial discharge		PC	≤20(Measured at   1.2Ur)

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Technical parameter

Potential   transformer capacity kVA	Fuse model	Fuse   rated current (A)
		Voltage class 12kV	Voltage class 63kV
100	XRNT-12kV	10	16
125	XRNT-12kV	10	20
160	XRNT-12kV	16	20
200	XRNT-12kV	20	25
250	XRNT-12kV	25	31.5
315	XRNT-12kV	31.5	40
400	XRNT-12kV	40	50
500	XRNT-12kV	50	63
630	XRNT-12kV	63	80
800	XRNT-12kV	80	100
1000	XRNT-12kV	100	125
1250	XRMT-12kV	125	-

Product structure diagram

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