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11KV RMU Medium Voltage Ring Main Unit MV Switchgear
Cotenele is a large manufacturer and supplier of medium voltage ring main units and their internal core components in China,Our medium-voltage RMUs mainly exported to regions such as Europe and the Middle East.The XGN66-12 series 11KV RMU Medium Voltage Ring Main Unit MV Switchgear is an indoor fixed AC metal-enclosed switchgear designed for 3.6–40.5 kV, 50 Hz three-phase power systems. It is widely used for power distribution, circuit control, and protection in applications such as substations, industrial plants, high-rise buildings, residential communities, and pad-mounted transformers.
As one of the well-known exporters in China, Cotenele has long provided customers in the Middle East, Africa, and Europe with stable quality, safe, and reliable ring main unit products.
The XGN66 series 11KV RMU Medium Voltage Ring Main Unit MV Switchgear is an indoor fixed AC metal-enclosed switchgear rated for 3.6–40.5 kV, widely applied in substations, industrial plants, high-rise buildings, residential communities, and pad-mounted transformers.
Its key features include a compact footprint (approximately 50% smaller than conventional designs), a robust metal-enclosed construction with separated compartments, mechanical five-prevention interlocks, and front cable access for easy installation and maintenance.
The equipment complies with GB3906, DL/T 404, and IEC 62271-200 standards.
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Model and meanings
Working conditions
1. The installation site must not be at an altitude higher than 1000 m.
2. The ambient temperature should range from -25 ℃ to +40 ℃, and the average temperature over any 24‑hour period must remain no higher than +35 ℃.
3. The allowable tilt angle from the horizontal plane is a maximum of 3°.
4. The seismic intensity at the location shall be no greater than magnitude 8.
5. The equipment must be placed in areas free from strong vibrations, heavy shocks, or the risk of explosion.
Main technical parameters
| SN | Item | Unit | Technical Parameters |
| 1 | Rated voltage | kV | 3.6,7.2,12,24,35,40.5 |
| 2 | Rated power-frequency withstand voltage | kV | For earth and between phases: 42 kV; for isolating distance: 48 kV |
| 3 | Rated lightning impulse withstand voltage | kV | For earth and between phases: 75 kV; for isolating distance: 85 kV |
| 4 | Rated frequency | Hz | 50 |
| 5 | Rated current | A | 630,1250, |
| 6 | Rated short-circuit breaking current (RMS) | kA | 20,25,31.5, |
| 7 | Rated short-circuit making current (peak) | kA | 50,63,80, |
| 8 | Rated dynamic withstand current (peak) | kA | 50,63,80 |
| 9 | Rated thermal withstand current for 4s (RMS) | kA | 20,25,31.5 |
| 10 | Protection rating (or Degree of protection) | IP2X | |
| 11 | Dimensions (width x depth x height) | mm | 900×1000×2300 |
| 12 | Weight | Kg | ≈600 |
What are the Structure and core advantages Of XGN66 RMU?
The XGN66 series 11KV RMU Medium Voltage Ring Main Unit MV Switchgear adopts a metal-enclosed box-type structure. The interior is typically partitioned by steel plates into independent compartments such as the circuit breaker compartment, busbar compartment, cable compartment, and instrument compartment. This structure enhances overall safety.
The core advantages of the RMUs include:
- Compact Size, Space Saving: The ring main unit has a more compact volume than common metal-clad switchgear such as KYN28 and KYN61, being only about 50% of their size, which can effectively reduce the floor space required for substations.
- Robust Structure, Reliable Performance: The ring main unit has a high mechanical strength body welded with high-quality angle steel or assembled from aluzinc-coated steel plates. All operations of the ring main units are equipped with mechanical interlocks featuring “five-prevention” functions, ensuring operational safety.
- Easy Maintenance, Safe Operation: The main components of the ring main units are located in the middle and lower part of the panel, facilitating installation and commissioning. Observation windows on the doors allow viewing of internal component status. The switchgear body is equipped with pressure relief channels to protect personnel in case of internal faults.
- Wide Application, Flexible Configuration: This RMU is suitable for various locations. The main switch is typically the ZN63A (VS1-12) vacuum circuit breaker, but it can also be equipped with a load-break switch. The disconnector is often the GN30-10 series rotary disconnector. Additionally, incoming and outgoing cables are connected from the front of the cabinet for convenient installation.
Application Scope
The XGN66 series 11KV RMU Medium Voltage Ring Main Unit MV Switchgear is widely used and are ideal choice for urban and rural grid renovation and user-side power distribution. Main applications scope include:
Power Plants and Substations: The XGN66 series ring main unit usually are used as auxiliary power or station service power distribution equipment, which usually mounted indoor or outdoor compact prefabricated substation.
Industrial and Mining Enterprises: In lots of factory or mine, they often used the compact RMUs for power distribution and control in workshops and factory areas to save space.
High-rise Buildings and Residential Communities: In urban living area, the ring main unit usually mounted outdoor substaion as core equipment in user distribution rooms or switching stations.
Pad-mounted Substations: As the high-voltage unit inside the compact substation to control the transformer in the substation.
Appearance and Dimension
Installation instruction diagram
Maintenance and Inspection Instructions
Users should regularly maintain and inspect the 11KV RMU Medium Voltage Ring Main Unit MV Switchgear based on the following items:
1. Clean the dust on the surface of all components, especially the insulation components.
2.Check the mechanical operation parts and regularly apply lubricating grease to ensure smooth and reliable operation.
3.For components such as circuit breakers, isolating switches, and grounding switches, maintenance should be carried out in accordance with their respective user manuals.
4.Inspect if the electrical contact points are in good condition, check for signs of overheating, and confirm that the grounding circuit is continuous.
5.Regularly check all fasteners for tightness.
For fault repair, it is usually recommended that users seek help from the manufacturer. For minor adjustments or minor malfunctions, users can refer to this manual and the relevant user manuals for the main components for self repair.
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Building 2, Changhong Industrial Park, No. 501 Liule Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province, China
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