11KV Medium Voltage Ring Main Unit MV Panels

Cotenele is one of the most important manufactuers for the RMUs in China,the HXGN15-12 compact ring main units manufactuered by us are widely popular in the market.The HXGN15-12 11KV Medium Voltage Ring Main Unit MV Panels is a fixed-type, metal-enclosed ring main unit，which usually used for three-phase 11 kV, 50 Hz power distribution systems. This HXGN15-12 RMU has the features of modular construction with separate busbar and switchgear compartments and a shutter mechanism that isolates the switchgear when the load break switch opens, this will ensure safe maintenance. The puffer-type load switch offers reliable interruption, while the operating mechanism (manual or motor‑driven) includes a comprehensive “five‑prevention” interlock. Its front‑to‑back three‑phase arrangement minimizes footprint. Components are easy to replace, and the unit presents no fire or explosion risk. It is suitable for ring network and terminal applications, including compact substations.

Model and meanings

Main technical parameters

Main technical parameters of RMU

Fuse protection transformer parameters

Working conditions

1.Ambient temperature:-25℃~ +40℃;

2. Altitude: Not exceed 1000m above sea level:

3.Ambient humidity: Daily average RH ≤ 95%: Monthly average RH ≤ 90%

4. Water vapor pressure:Daily average RH≤ 2.2kPa; Monthly average RH≤ 1.8kPa;

5. Ambient environment: no fire, explosion danger, serious pollution, chemical corrosion and severe vibration place

Product Structure

The HXGN15-12 11KV Medium Voltage Ring Main Unit MV Panels adopts a metal-enclosed fixed enclosure structure. The enclosure is typically constructed from riveted galvanized aluminum steel sheets and generally consists of an upper unit and a lower cable compartment.

The unit consists of the following four functional compartments:

Working Principle

1. Arc Quenching Principle of the Main Switch

SF6 Load Break Switch RMU: The switch shell is made of epoxy resin and filled with SF6 gas, which serves as both an insulating and arc-quenching medium. During opening process, a puffer-type mechanism generates a gas flow that extinguishes the arc, this can ensure stable and reliable interruption performance.

Vacuum Load Break Switch RMU: Uses a vacuum interrupter, where the high dielectric strength of the vacuum extinguishes the arc.This version offers the advantages of no risk of fire or explosion and a long electrical life.

2. Protection Principle of the Switch-Fuse Combination

The load switch can be combined with fuses. When any phase fuse blows, its striker triggers a linkage mechanism that opens the load switch, providing a single-operation interruption of short-circuit current to protect the transformer.

3. Ring Network Power Supply Principle

Ring main units can be flexibly combined and extended to form ring network power supply units. If one incoming line fails, the other incoming line can maintain power supply, ensuring continuous operation of user branches.

4. Safety Interlock Mechanism

The 11kV Medium Voltage Ring Main Unit MV Panels are equipped with a comprehensive "five-proof" mechanical interlocking device. For example, the hatch can only be opened after the load switch is open and the grounding switch is closed; the load switch cannot be closed when the hatch is open.

Why choose Cotenele?

Cotenele International Trade (Wenzhou) Co., Ltd. is a technology-driven manufacturer and exporter that combines a self-owned 30, 000m² factory with Years of technological accumulation in 12kV–40.5kV switchgear core components.

We have invested a lot of effort in the research and development of gas-insulated switchgears, environmentally-friendly switchgears, and air-insulated switchgears, and also have a complete product line covering ring main units, prefabricated substations, transformers, circuit breakers, isolating switches, and other products.Our products serve demanding sectors such as power, railway, petrochemical, subway, municipal construction, steel, and coal.

Backed by ISO9001, ISO14001, and ISO18001 certifications, we fully implement ERP management and have achieved key breakthroughs in environmental protection, compact design, intelligence, and maintenance-free operation.

Located in China’s "Electrical Capital" (Liushi, Yueqing), we are not only a manufacturer but a high-quality integrated supplier of medium-voltage complete-set components. Our team moves with the times, committed to providing the best products and the best service. Contact us to experience reliability, innovation, and wholehearted support.

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