The XGN15-12~24 Ring Main Unit guide is a fully modular, metal-enclosed, air-tight switchgear solution designed for high-performance power distribution at 12kV and 24kV voltage levels. Featuring SF6 gas insulation, superior mechanical interlocking, and high environmental adaptability, the XGN15 RMU is widely used in medium-voltage distribution networks for its safety, compact design, and intelligent automation capabilities.
Technical Parameters of XGN15-12~24 Ring Main Unit
| Specification | 12kV Version | 24kV Version |
|---|
| Rated Voltage | 12kV | 24kV |
| Rated Frequency | 50/60Hz | 50/60Hz |
| Main Busbar Rated Current | 630A | 630A |
| Branch Busbar Rated Current | 630A / 125A (fuse-limited) | 630A / ≤100A (fuse combination) |
| Power Frequency Withstand Voltage | 42kV | 65kV |
| Impulse Withstand Voltage | 75kV | 85kV |
| Short-Time Withstand Current | 20kA/3s | 25kA/2s |
| Peak Withstand Current | 50kA | 63kA |
| Short-Circuit Making Current | 50kA | 50kA |
| Short-Circuit Breaking Current | 31.5kA (CB cabinet) | 31.5kA |
| Load Break Current | 630A | 630A |
| Cable Charging Current | 10A | 25A |
| Mechanical Life (Load Switch) | 5000 times | 3000 times |
| Mechanical Life (Grounding Switch) | 2000 times | 2000 times |
| Protection Level | IP3X | IP3X |
| Structure Type | Modular / Metal-enclosed | Modular / Metal-enclosed |
| Insulation Medium | SF6 Gas | SF6 Gas |
Structural Highlights
Busbar Room
- Located at the upper part of the cabinet, connecting all units in the switchgear row.
Load Switch Compartment
- Built with epoxy resin cast columns filled with SF6 gas for insulation.
- Optional gas density meter or alarm contact display available.
Cable Room
- Spacious layout allows easy installation of cables, lightning arresters, current transformers, and grounding switches.
- Lower chamber sealed with rubber gasket to prevent moisture and small animals.
Low-Voltage Control & Mechanism
- Mechanical interlocking and spring operating mechanisms built-in.
- Auxiliary accessories: capacitive indicators, trip coils, auxiliary contacts, relays, control circuits.
- For 750mm wide cabinets, dual low-voltage rooms can hold additional automation gear.
Dimensions (Overall & Mounting)
| Configuration | Height (mm) | Width (mm) | Depth (mm) |
|---|
| XGN15-12 Standard | Custom | 750 | Standard |
| XGN15-24 Configuration | Custom | 750 | Standard |
(Exact cabinet size and layout can be customized per your project.)
Operating Conditions
| Environment Factor | Specification |
|---|
| Ambient Temperature | -15°C to +40°C |
| Daily Avg. Temperature | ≤35°C |
| Altitude | ≤1000m |
| Relative Humidity (Daily / Monthly) | ≤95% / ≤90% |
| Vapor Pressure (Daily / Monthly) | ≤2.2kPa / ≤1.8kPa |
| Seismic Intensity | ≤ Magnitude 8 |
| Environmental Limitations | No corrosive or flammable gas |
Packaging & Delivery
- Packed in reinforced wooden cases with internal cushioning.
- Suitable for long-distance sea and air transport.
- Custom switchgear layout and accessories can be pre-configured based on order.
Application Scenarios
- Urban secondary substations
- Industrial plant power systems
- Renewable energy microgrids
- Public infrastructure projects
- Smart grid distribution networks
Frequently Asked Questions
Q1: What’s the advantage of the modular design in the XGN15-12~24 RMU?
A: It allows flexible unit combination, fast expansion, and convenient maintenance, making it ideal for scalable networks.
Q2: Can this RMU guide be equipped with remote monitoring or automation?
A: Yes, it supports motorized operation, control terminals, and SCADA integration.
Q3: Is the SF6 gas fully sealed inside the unit?
A: Yes, the gas-insulated chamber is completely sealed and pressure-tested to ensure long-term operation without leakage.
