XGN15-12(SF6) Unit AC Metal-enclosed Ring Network Switchgear (hereinafter referred to as ring network switchgear) adopts advanced foreign technology and meets the demands of domestic and urban network reconstruction. It is a new generation of high-voltage electrical products developed through independent design and development. All the technical performance meets the standards of IEC 62271-200:2003 and GB 3006.
The main switch, operating mechanism, and other components of the ring network switchgear use original ABB equipment or SF1-12 switchgear, which is assembled in China using imported parts. We can also use original imported ABB equipment: SF1 type SF6 circuit breaker or VD4-S type vacuum circuit breaker. Its operation mode can be divided into two types: manual and electric. The cabinet is processed using numerical control machine tools and connected by rivets. Its protection degree is IP3X. It has a reliable mechanical interlock and an operation function for error prevention.
The product has a small volume, light weight, beautiful appearance, easy operation, long life, high parameters, no pollution, and requires minimal maintenance, making it an extremely remarkable product.
XGN15-12(SF6) Unit AC Metal-enclosed Ring Network Switchgear is used in the power system of AC 50Hz 12kV to receive and distribute power. The main switch in the cabinet is an SF6 switch.
Item Unit Data Rated voltage KV 12 Rated frequency HZ 50 Rated currentofmain bus/Maximum rated current offuse A 630/125 Rated short-time withstand current ofmain circuit and ground circuit KA/S 20/3 Rated peak withstand currentofmain loop and ground loop KA/S 50 Rated short-circuit closing current ofmain circuit and ground circuit KA/S 50 Number of full capacity breaks ofload switch KA/S 100 Fuse breakingcurrent TIME 31.5/40 Rated closed-loop breaking current KA/S 630 Rated transfer current A 1600 Mechanical life A 2000 1min power frequency withstand voltage (peak) phase to phase, ground/isolation fracture TIME 42/48 Lightningimpulse withstand voltage (peak) phase to ground/isolation fracture KV 75/85 Secondary circuit lmin power frequency voltage KV 2 Class of protection KV IP3X
The XGN15-12 24KV SF6 Ring Main Unit (RMU) Cabinet is a high-performance, medium voltage electrical distribution device designed for reliable, safe, and efficient operation. Its SF6 gas insulation and metal-enclosed design ensure superior safety, compactness, and durability, making it ideal for urban substations, industrial facilities, and utility networks.
This comprehensive guide covers safety instructions, installation guidelines, troubleshooting common issues, and technical services, providing a complete reference for engineers, operators, and procurement professionals.
Overview of XGN15-12 RMU Cabinet
Technical Specifications
Safety Instructions
Installation Guidelines
Common Faults and Causes
Troubleshooting and Corrective Actions
Technical Services and Support
Advantages of SF6 RMU Design
Applications and Suitable Environments
Certifications and Compliance
Conclusion
The XGN15-12 SF6 RMU Cabinet is designed for medium voltage ring main distribution networks, offering:
SF6 Gas Insulation: Exceptional dielectric strength and arc-quenching performance.
Metal-Enclosed Structure: Enhances mechanical protection and operator safety.
Compact Design: Saves space in indoor and outdoor installations.
Reliable Switching: Enables smooth operation and long service life.
IEC Certification: Compliance with international safety and performance standards.
This RMU is suitable for urban electrical grids, industrial power distribution, and utility substations, ensuring safe and efficient network management.
| Parameter | Specification |
|---|---|
| Rated Voltage | 24 kV |
| Rated Current | 630–1250 A |
| Short-Circuit Breaking Capacity | 20 kA / 25 kA |
| Insulation Medium | SF6 Gas |
| Enclosure Type | Metal-Enclosed |
| Installation Environment | Indoor / Outdoor |
| Mechanical Endurance | 10,000 operations |
| Electrical Endurance | 2,000 operations |
| Operating Frequency | 50Hz / 60Hz |
| Ambient Temperature Range | -40°C to +50°C |
| Operating Mechanism | Spring or Motor Driven |
| Protection Class | IP54 / IP65 |
These specifications ensure high reliability and long-term performance under various environmental and operational conditions.
Proper safety measures are critical when working with medium voltage RMUs:
Always disconnect power supply before maintenance or inspection.
Wear personal protective equipment (PPE), including insulated gloves, safety glasses, and protective clothing.
Avoid direct contact with SF6 gas; it is non-toxic but can displace oxygen in confined spaces.
Follow manufacturer and IEC guidelines for operation, testing, and maintenance.
Ensure proper grounding of all equipment.
Operate switches slowly and deliberately to avoid mechanical damage.
Do not override mechanical interlocks.
Ensure access areas are clear of unauthorized personnel.
Monitor gas pressure and mechanical indicators before switching operations.
Adhering to these guidelines ensures operator safety, equipment reliability, and long-term system performance.
Select a stable and level foundation with adequate drainage.
Ensure sufficient clearance for operation and maintenance.
Verify environmental conditions comply with temperature and humidity requirements.
Prepare grounding systems according to electrical standards.
Position the Cabinet: Align the RMU according to layout diagrams.
Secure the Base: Fix the cabinet to the foundation with bolts.
Electrical Connections: Connect incoming and outgoing feeders as per wiring diagrams.
SF6 Gas Check: Confirm pressure is within recommended levels.
Mechanical Test: Verify switches operate smoothly.
Functional Test: Conduct no-load and load switching tests.
| Test Type | Requirement |
|---|---|
| Insulation Resistance Test | ≥100 MΩ |
| Contact Resistance Measurement | ≤10 μΩ |
| Mechanical Operation Test | Smooth operation for full cycle |
| SF6 Gas Pressure Verification | Within specified manufacturer range |
| Protective Relay Coordination | Correct tripping and signal operation |
| Fault | Possible Cause |
|---|---|
| Breaker fails to close | Mechanical obstruction or misalignment |
| Gas leakage detected | Damaged seals or SF6 cylinder |
| Unstable current or voltage | Faulty contacts or loose connections |
| Excessive noise during operation | Worn or loose moving parts |
| Incorrect status indicator | Faulty indicator or control circuit |
| Tripping without load | Incorrect relay settings or insulation fault |
Understanding these issues enables faster diagnosis and repair, minimizing downtime.
Symptom: Switch does not operate smoothly.
Action: Inspect moving parts, lubricate, and replace worn components.
Symptom: Unstable current or voltage, poor load switching.
Action: Tighten electrical connections, check contact resistance, replace damaged contacts.
Symptom: Low pressure or leakage.
Action: Detect leaks using a gas detector, repair, and refill SF6.
Symptom: Incorrect status displayed.
Action: Calibrate or replace the indicator panel.
Reliable after-sales support ensures maximum uptime and performance:
Installation Assistance: Guidance on setup, alignment, and testing.
Maintenance Programs: Regular inspection and preventive maintenance.
Spare Parts Supply: OEM parts available for replacement.
Remote Troubleshooting: Assistance via phone, email, or video consultation.
Warranty Service: Coverage for manufacturing defects and performance issues.
These services ensure long-term reliability and operator confidence.
Compact and Space-Saving: Suitable for urban and constrained environments.
Enhanced Safety: SF6 insulation and metal enclosure reduce the risk of electrical hazards.
Durability: Corrosion-resistant, weatherproof design for indoor and outdoor use.
Low Maintenance: Reduced servicing requirements compared to air-insulated switchgear.
Reliable Operation: High switching endurance and minimal downtime.
Urban Substations: Optimized for space-constrained areas.
Industrial Facilities: Factories, manufacturing, chemical plants.
Renewable Energy: Solar, wind, and hydroelectric networks.
Utility Networks: Ring main distribution for reliable power supply.
Railway Electrification Systems: Stable supply for traction power.
The XGN15-12 SF6 RMU Cabinet meets international standards:
IEC 62271 Series: medium voltage switchgear standards.
ISO 9001: Quality management certification.
CE Marking: Compliance with EU safety and environmental regulations.
RoHS Compliance: Restriction of hazardous substances.
Certifications confirm quality, safety, and environmental responsibility.
The XGN15-12 24KV SF6 Ring Main Unit RMU Cabinet is a reliable, compact, and durable solution for medium voltage distribution networks. Its SF6 gas insulation, metal-enclosed design, and IEC certification ensure safe and efficient operation in indoor and outdoor environments.
By following proper installation, safety protocols, and maintenance, operators can achieve long-term performance, reduced downtime, and enhanced electrical protection. Suitable for substations, industrial facilities, and urban grids, this RMU is ideal for modern electrical distribution requirements.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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