GXGND-12 SF6 RMU

The GXGND-12 series is a 12 kV SF₆‑insulated ring main unit (RMU) – a compact medium‑voltage switchgear designed for urban grid renovation, industrial distribution substations, commercial building power supply, and renewable energy grid‑connection projects (e.g., photovoltaic and wind power).

All switching devices are housed within a stainless‑steel gas tank employing a fully sealed SF₆ insulation system, which completely isolates internal components from dust, moisture, corrosive gases, and harsh ambient conditions. This design significantly enhances operational reliability and extends service life. The cabinet integrates load switches, circuit breakers, earthing switches, fuse protection, and monitoring units, enabling ring‑network power supply, radial feeder protection, and comprehensive overload/short‑circuit protection within a single unit.

The hermetically sealed stainless‑steel gas tank features an ultra‑low gas leakage rate, ensuring stable dielectric performance even in high‑humidity, dusty, or corrosive environments. Its insulation characteristics remain consistent throughout long‑term operation, substantially reducing routine maintenance and on‑site inspection costs.

Rated at 12 kV with configurable currents up to 630 A, the RMU delivers excellent short‑circuit making and breaking capabilities, fully compliant with IEC 62271‑102 and IEC 62271‑103. The built‑in high‑breaking‑capacity fuse combined with the load switch provides millisecond‑level fault interruption, effectively safeguarding distribution lines and downstream equipment against overload and short‑circuit damage.

The modular design allows flexible configuration of incoming, outgoing, transformer, and metering cabinets, occupying minimal floor space – ideal for constrained installation sites. The front panel features centralized controls, analog instruments, and intelligent monitoring modules for clear, intuitive data presentation. Dual manual/electric operation, together with comprehensive mechanical and electrical interlocks, prevents misoperation and ensures maintenance personnel safety. Standard colour‑coded terminals facilitate fast, error‑free on‑site wiring.

All cabinet structural components receive anti‑corrosion spray treatment, and the sealed internal construction eliminates the need for frequent insulation cleaning or component replacement. With rigorous incoming material inspection, process control, and factory withstand‑voltage testing – backed by Changyunzhining’s complete industrial chain – the product guarantees consistent batch quality and reliable long‑term operation.

Typical applications include urban medium‑voltage distribution networks, industrial park power distribution, commercial complex supplies, distributed PV/wind grid integration, community ring network substations, and mining or rural grid upgrades. Panel layouts, electrical parameters, and intelligent communication modules can be customised to meet specific site requirements.