GTXGN-12 Solid Insulated Ring Main Unit
Ring Main Unit GTXGN-12 Solid Insulated Ring Main Unit The GTXGN-12 Solid Insulated Ring Main Unit (RMU) is an innovative, environmentally friendly, and fully sealed
SRM16-12 SF6 Gas-Insulated Ring Main Unit
SRM16-12 SF6 Gas-Insulated Ring Main Unit
The SRM16-12 is a fully insulated and enclosed ring main unit switchgear developed and manufactured by our company. It has successfully passed type testing at the National High Voltage Electrical Appliance Testing Center. This product is widely used in 11kV/10kV/6kV distribution systems and is the preferred switchgear for various urban and rural users’ power distribution systems. The switchgear is modular, allowing for combinations based on different applications, consisting of fixed and expandable units to meet the flexible needs of compact switchgear in substations.
Key Features:
Fully Insulated and Sealed: The SRM16-12 is designed as a completely sealed system, with all live components enclosed in a stainless steel housing, ensuring reliable operation and personal safety.
Reliable Operation: With the busbars and switches completely sealed and filled with SF6 gas at 1.4 bar pressure, the protection level reaches IP67, allowing the switchgear to function normally even under extreme conditions, including short-term water immersion.
Safety Mechanisms: The switchgear features a comprehensive five-prevention interlock system that eliminates risks of human error, ensuring operator safety with reliable pressure relief pathways.
Flexible Solutions: The switchgear comes in fixed and expandable configurations, suitable for various installation positions and environments, and can be equipped with electric operation mechanisms and remote monitoring options based on user needs.
Why choose the SRM16-12 SF6 gas-insulated switchgear cabinet
The SRM16-12 fully insulated and enclosed ring main unit switchgear operates under GB standards and boasts a design lifespan of over 30 years at indoor conditions (20°C). It utilizes SF6 gas as the arc-extinguishing and insulating medium, providing high reliability and safety. Its modular design allows for any combination of standard and expandable units, achieving complete modularity. The switchgear can also provide automation solutions, minimizing field installation and commissioning efforts, making it an ideal choice for various applications in urban and rural electrical systems.
Product Advantages
Excellent SF₆ Insulation Performance: SF₆ gas provides excellent insulation and strong arc-extinguishing capability, ensuring reliable switching performance.
Fully Enclosed Gas-Filled Structure: The sealed gas-insulated structure offers high protection and strong resistance to humidity, dust, and pollution.
Compact Size: The compact design occupies less floor space and is suitable for installations where space is limited.
Stable Operation: The unit operates reliably, offers long maintenance-free intervals, and is well suited for harsh environments.
Flexible Modular Combination: Incoming and outgoing lines, PT units, and circuit breaker units can be freely configured to suit different distribution schemes.
Complete Mechanical Interlocking: The complete mechanical interlocking system improves safety and effectively prevents misoperation.
Operating Conditions
Environmental Temperature: Not exceeding +40℃ and not lower than -15℃, with an average temperature not exceeding +35℃ within a 24-hour period.
Altitude: Not exceeding 4000 meters.
Humidity Conditions: Daily average humidity ≤ 95%, monthly average humidity ≤ 90%.
Safe Environment: No fire or explosion hazards, no severe pollution, chemical corrosion, or intense vibrations.
Seismic Resistance: Up to 8 degrees.
Application
SRM16-12 is mainly used in urban power grids, industrial parks, subways, high-rise buildings, mines, and humid/highly polluted environments, serving as 10kV ring network power supply, terminal distribution, and line protection equipment.
Model meaning
Technical Parameters
Overall and mounting dimensions(mm)（Reference）
Model meaning
| SRM16-12 SF6 Gas-Insulated Ring Main Unit | S: | Sealed insulated switchgear |
| R: | Ring main unit | |
| M: | Modular design | |
| 16: | Design series number | |
| 12: | Rated voltage 12kV |
Technical Parameters
| Item | Specification |
|---|---|
| Rated Voltage | 12 kV |
| Rated Frequency | 50 Hz |
| Rated Current | 630 A (up to 1250 A for circuit breaker unit) |
| Rated Short-Circuit Breaking Current | 20 kA / 25 kA |
| Rated Short-Time Withstand Current | 20 kA / 25 kA (1 s / 3 s) |
| Rated Peak Withstand Current | 50 kA / 63 kA |
| Insulation Level | Power frequency withstand voltage: 42 kV / Lightning impulse withstand voltage: 75 kV |
| Insulation Medium | SF₆ gas (absolute pressure approx. 1.4 bar at 20°C) |
| Gas Tank Material | 3.0 mm stainless steel, fully sealed and insulated |
| Degree of Protection | IP67 (gas tank) / IP40 (external enclosure) |
| Annual Leakage Rate | ≤ 0.2‰ per year |
| Mechanical Endurance | Load switch ≥ 10,000 operations; Circuit breaker ≥ 20,000 operations |
| Busbar Specification | 400 mm² copper busbar; Earthing busbar 150 mm² |
| Ambient Temperature | -45°C to +55°C |
| Installation Altitude | ≤ 2000 m (customizable up to 3000 m) |
| Relative Humidity | ≤ 95% (non-condensing) |
| Applicable Standards | GB/T 11022, GB 3906, IEC 62271-200 |
Overall and mounting dimensions(mm)（Reference）
Custom Sf6 Insulated Ring Main Unit Type : Outdoor‑Class SF₆ Gas‑Insulated Ring Main Unit Solutions for Your Project
(The values can be customized according to local project requirements.)
If you have specific requirements for the parameters, structure, or configuration of the SRM16‑12 SF₆ gas‑insulated ring main unit (RMU), please contact us. Our team of account managers, technical engineers, and product consultants will evaluate your electrical network design, rated specifications, installation environment, operational needs, and project timeline to deliver a tailored solution that meets your exact application scenario.
We can customize the rated voltage level (commonly 12 kV), rated current capacity, modular unit layout (e.g., V‑unit, load break switch, or fuse combination), busbar scheme, enclosure structure and protection grade, intelligent control and protection devices, and other key design details to ensure dependable reliable operation and optimal performance in medium‑voltage distribution networks. The SF₆‑insulated design uses high‑dielectric SF₆ gas to provide excellent insulation and arc‑extinguishing performance, enabling compact size and a fully sealed structure that enhances safety and reduces maintenance needs.
This RMU solution is ideal for urban ring network power distribution, secondary substations, industrial and commercial facilities, renewable energy integration, and other applications where durability, space efficiency, and reliable switching are essential.
FAQ
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