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A reliable and compact solution for secondary distribution networks is essential for modern utilities. The SF6 Ring Main Unit (RMU) stands out as a premier choice, offering superior insulation, safety, and operational efficiency in a sealed, maintenance-free design. Utilizing Sulfur Hexafluoride (SF6) gas as its insulating and arc-quenching medium, this unit ensures exceptional performance in confined spaces where safety and reliability are non-negotiable. Our 12KV Ring Main Unit is engineered for standard distribution applications, providing robust circuit protection and easy integration. For more demanding infrastructure, our High Voltage Ring Main Unit series delivers enhanced capacity and durability for critical network segments. Both units are designed to minimize footprint while maximizing operational uptime and personnel safety.
The SF6 Ring Main Unit operates on a simple yet highly effective principle. The core switching functions—load breaking, fault isolation, and circuit protection—are performed by switches and circuit breakers housed within a sealed, gas-filled compartment. This SF6 gas environment provides excellent dielectric strength, effectively insulating live parts and extinguishing any electrical arcs that may form during switching operations. This sealed system is what makes the SF6 Ring Main Unit so advantageous; it is immune to environmental contaminants like dust, moisture, and salt spray, which can degrade conventional air-insulated equipment. This results in a dramatically extended service life, minimal maintenance requirements, and consistent performance in diverse climatic conditions, from arid deserts to humid coastal regions.
| Parameter | Specification |
|---|---|
| Rated Voltage | 12 kV / 24 kV |
| Rated Frequency | 50 Hz / 60 Hz |
| Rated Normal Current | 630 A |
| Rated Short-Time Withstand Current | 20 kA / 25 kA (3 sec) |
| Rated Peak Withstand Current | 50 kA / 63 kA |
| SF6 Gas Pressure (20°C) | 1.4 bar (absolute) |
| IP Rating | IP67 (Tank), IP3X (Enclosure) |
| Operating Mechanism | Manual / Motorized (Optional) |
| Busbar System | Single Busbar |
| Cable Connection | Standard for XLPE / PILC Cable |
| Function Module | Description | Typical Symbol |
|---|---|---|
| Circuit Breaker (CB) Unit | Provides full overcurrent and short-circuit protection, capable of making and breaking fault currents. | CB |
| Load Break Switch (LBS) Unit | For making and breaking rated load currents under normal operating conditions. | LBS |
| Fuse-Switch (FS) Unit | Combines a load break switch with high-voltage fuses for transformer protection and fault isolation. | FS |
| Cable Connecting Unit | Standard chamber for incoming/outgoing cable termination with optional surge arrester. | CC |
| Busbar Linking Unit | Provides the connection between different functional modules within the unit. | BL |
