Leading Green Grid Transformation: Rockwill’s Full-Matrix SF6-free Switchgear Solutions

In response to global environmental trends and the pursuit of compact design, SF6-free switchgear has become a critical development direction in medium and high-voltage power transmission and distribution. Regarding insulation and interruption media, non-SF6 technologies present multiple pathways. As an industry leader, Rockwill has established a comprehensive matrix of SF6-free switchgear solutions covering all application needs.

1.Main Technical Categories of SF6-Free Switchgear (Classified by Insulation/Interruption Media)

From a technical principle perspective, current mainstream non-SF6 solutions primarily utilize the following media:

Technical Type Insulation Medium Interruption Medium/Principle Main Characteristics Dry Air / Compressed Air Dry air, Compressed air Vacuum interruption + Air insulation Environmentally friendly, safe, and low cost; relatively lower insulation performance, requiring increased clearance or pressure Eco-Gas Insulation g³, N₂, mixed eco-friendly gases Vacuum interruption + Gas insulation Insulation strength close to or better than SF₆, extremely low GWP, and compact equipment size Solid / Vacuum Insulation Epoxy resin, silicone, vacuum Vacuum interruption Completely gas-free, maintenance-free, and compact size; commonly used in C-GIS and ring main units Conventional Air Insulation Atmospheric air Vacuum interruption Simple structure, low cost, and large volume; mostly used in air-insulated switchgear (AIS) 2.Rockwill's Full-Matrix SF6-Free Solutions

Based on the above technical paths, Rockwill provides a complete product series ranging from medium-voltage and high-voltage circuit breakers, load switches, ring main units to various switchgear types, as well as high-voltage dead tank breakers, live tank breakers, and Gas Insulated Switchgear (GIS), comprehensively meeting the needs of power grids, industry, commercial sectors, and new energy fields.

2.1 SF6-Free Ring Main Unit (RMU)

• Insulation Method: Dry air, g3 gas, solid insulation
• Interruption Method: Vacuum interruption
• Advantages: Modular design, compact structure. Suitable for urban distribution networks, industrial parks, charging stations, etc., meeting both miniaturization and environmental standards.

2.2 SF6-Free Load Break Switch (A-LBS) and Circuit Breaker (Eco-GCB)

• A-LBS: Utilizes vacuum or eco-gas for arc extinction. Suitable for distribution automation, sectioning, and interconnection.
• Eco-GCB: Employs puffer interruption technology. Insulation medium options include dry air, g3, or compressed air. Features high short-circuit interruption capability and long electrical lifespan.

2.3 Comprehensive Coverage of Various Switchgear Types

• C-GIS (Cubicle-type GIS): Uses g3, dry air, or N2 mixture for insulation. Compact structure, suitable for underground substations, high-rise buildings.
• AIS (Air-Insulated Switchgear): Uses vacuum circuit breaker + air insulation. Simple and robust structure, suitable for outdoor substations and industrial users.
• Metal-Clad Switchgear: Can be configured with dry air or eco-gas insulation, offering enhanced protection and safety.

2.4 Complete Coverage of High-Voltage Switchgear up to 550kV

• LTB & DTB: Dead Tank Circuit Breaker and Live Tank (Disconnecting) Circuit Breaker.
• H-GIS & GIS: Hybrid GIS and Gas Insulated Switchgear, using eco-gases. Saves space, suitable for substation expansion and renovation.

4. Core Advantages of Rockwill's SF6-Free Equipment

• Environmental Compliance: Complete elimination of SF6, with GWP approaching zero. Complies with EU F-Gas regulations and global low-carbon policies.
• Compact Design: By optimizing insulation structures and adopting high insulation strength gases (e.g., g3), compressed air, and mixed gases, our full-matrix combination solution achieves a footprint comparable to traditional SF6 equipment at the same voltage level.
• High Reliability: Mature puffer + vacuum interruption technology, long electrical lifespan, stable insulation media, and low maintenance requirements.
• Full-Scenario Adaptability: From 12kV to 550kV, covering core component technologies like circuit breakers and load switches, addressing the technical challenges of compact design!

5. Summary

Rockwill's full-matrix SF6-free switchgear not only responds to global environmental initiatives but also achieves the optimal balance between compactness, reliability, and cost-effectiveness through diverse insulation and interruption technologies (dry air, g3, N2, vacuum insulation, etc.). Whether for new power grid construction, urban distribution upgrades, or industrial and new energy projects, Rockwill can provide matching SF6-free solutions, supporting the power system's transition towards a green, efficient, and sustainable future.

For further information on specific models and technical parameters, please feel free to contact us.