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

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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  • GTXGN

  • Giantele

  • IP67

  • 10kV/11kV/12kV

  • 630A/1250A

  • 50/60Hz

  • Three

  • 1pcs

  • 2000/5000

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.



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



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


ItemUnitData
Rated voltagekv12
Rated currentA630
Rated short-time withstand current (4s)kA25
Rated peak withstand currentkA50
Rated short-circuit closing current (peak)kA50
Rated active load breaking currentA630
Rated closed loop breaki ng currentA630
Rated cable charge breaking currentA10
Rated breaking transfer current of combined appliancesA3700
1 min power frequency withstand   voltagePhase-   to-phase, phase -to- ground, vacuum breakingkv42
Insulation breakingkv48
Lightning impact withstand voltagePhase-   to-phase, phase -to- ground, vacuum breakingkV75
Insulation breakingkv85
MechanicallifeCircuit breakerTime10000
Insulation knife, grounding knifeTime3000
Protection grade
IP4X
Shell protection grade
IP4X
Partial dischargePC≤20(Measured at   1.2Ur)

Technical parameter

Potential   transformer capacity kVAFuse modelFuse   rated current (A)
Voltage class 12kVVoltage class 63kV
100XRNT-12kV1016
125XRNT-12kV1020
160XRNT-12kV1620
200XRNT-12kV2025
250XRNT-12kV2531.5
315XRNT-12kV31.540
400XRNT-12kV4050
500XRNT-12kV5063
630XRNT-12kV6380
800XRNT-12kV80100
1000XRNT-12kV100125
1250XRMT-12kV125-



Product structure diagram

GTXGN-12 structure diagram

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