Gas Insulated Ring Main Unit (RMU)

Gas Insulated Ring Main Unit (RMU) - Compact & Maintenance-Free Solution

Our Gas Insulated Ring Main Unit (RMU) delivers enterprise-grade performance with SF6-insulated technology. Designed for 12kV distribution networks, it features IP67 protection rating, operates at rated currents from 630A to 3150A, and withstands short-circuit currents up to 25kA. With a compact footprint of 800-1200mm width, our RMU occupies 30-50% less space than conventional switchgear. Backed by 18 patents and 20+ years of manufacturing expertise, we provide zero-maintenance operation for the entire 20-30 year service life.

What Makes Our RMU Different?

You've probably worked with big equipment that needs to be maintained all the time. That is no longer the case with our answer.

Built into this box are fully sealed SF6 gas chambers. This means that dust, water, or small animals won't be able to damage your gear. The stainless steel casing protects well even in the toughest conditions.

Safety is the most important thing in your work. That's why we got rid of all the live parts that were visible from the outside. You will like how we built in a lot of pressure-relief openings into every unit.

Modern displays don't have a lot of room. Our small design gives you the same electricity performance as the bigger ones, but it frees up space for other important tools.

Core Technical Features

Insulation Excellence

The insulating strength of SF6 gas is 2.5 times that of air. We can make small forms with this better insulation without sacrificing safety or efficiency.

No Maintenance Operation

The sealed gas chambers keep the pressure stable for many years. You won't have to worry about weather damage or regular upkeep on the contacts that switch.

Flexible Configuration

We offer modular designs with 2-4 feeder bays plus transformer protection. Each configuration adapts to your specific network requirements.

Technical Specifications

Why Choose Our RMU?

Uncompromising Quality Standards

We implement strict quality control at every production stage. From raw material procurement through final installation, nothing escapes our inspection protocols.

Our quality management follows ISO 9001 standards. We've integrated the "zero defects" concept into every manufacturing detail. This ensures you receive equipment that performs flawlessly from day one.

Comprehensive Testing

• High-voltage withstand tests at 2.5× rated voltage
• Partial discharge measurements below 10pC
• Contact resistance verification under 100μΩ
• 1000-cycle endurance testing
• SF6 gas purity testing at >99.8%
• Pressure decay validation over 48 hours

Advanced Manufacturing Capabilities

We operate 120+ sets of cutting-edge production equipment. Our facility includes CNC automatic winding machines, static vacuum casting systems, and microcomputer-controlled curing furnaces.

This investment in technology translates directly to your benefit. You receive consistently high-quality products manufactured to precise specifications.

Our technical team includes 15 senior engineers and over 30 intermediate technicians. They bring decades of combined experience to every project.

Real-World Applications

Urban Distribution Networks

Underground substations face unique challenges. Water ingress and space constraints can cripple conventional equipment.

Our Gas Insulated Ring Main Unit excels in these demanding conditions. The IP67 rating means your unit keeps operating even during temporary submersion. You'll find this particularly valuable in subway stations and basement installations.

Industrial Environments

Petrochemical plants and steel mills expose equipment to corrosive atmospheres. Salt spray and industrial pollutants destroy conventional air-insulated switchgear rapidly.

We've designed our Gas Insulated Ring Main Unit (RMU) to thrive in these conditions. The sealed enclosures resist chemical contamination while maintaining consistent switching performance year after year.

Renewable Energy Installations

Offshore wind farms and remote solar plants demand reliable equipment. Service access is expensive and weather windows are limited.

The maintenance-free design eliminates routine service calls. Your equipment operates reliably through extreme weather conditions without intervention.

Our Proven Track Record

We've delivered power solutions across hundreds of major projects:

Municipal Infrastructure

• Xuzhou Rail Transit Network Control Center
• Xuzhou High-speed Railway East Station
• Xuzhou New Health Hospital Phase I

These critical installations require absolute reliability. We provided dual-circuit power supply designs ensuring zero downtime.

Commercial Developments

• Xinhuai Central Complex
• Huaihai Xintiandi Phases 7-8
• Xuzhou Fantawild Adventure

Our Tianyu Yayuan project achieved top quality assessment results through meticulous execution and quality control.

Industrial Applications

• XCMG Group factory power upgrades
• GCL Photovoltaic Industrial Park
• Huaihai Biomedical Industrial Park

We completed these projects ahead of schedule while exceeding quality standards.

Manufacturing Excellence

Certifications You Can Trust

All our products hold international certifications:

• ISO 9001 Quality Management
• ISO 14001 Environmental Management
• OHSAS 45001 Occupational Health & Safety
• National CCC Mandatory Certification

These aren't just certificates on the wall. They represent our commitment to manufacturing excellence and product safety.

Innovation Through Patents

We've secured 18 patents through continuous research and development. This intellectual property demonstrates our technical leadership and commitment to advancing switchgear technology.

Installation and Operation

Quick Deployment

The factory-assembled design simplifies installation. You'll reduce on-site work and minimize commissioning time.

Each unit arrives fully tested and ready for connection. This accelerates project timelines and reduces installation risks.

Silent Operation

The enclosed switching mechanisms operate quietly. You won't deal with the noise pollution common with conventional switchgear.

This makes our RMU ideal for commercial buildings, hospitals, and other noise-sensitive environments.

Environmental Adaptability

Whether you're installing in arctic conditions or desert climates, we've got you covered. Extended temperature ratings from -50°C to +55°C are available through enhanced materials and pressure compensation systems.

Coastal installations benefit from superior salt spray resistance. The sealed design prevents corrosion that would rapidly degrade exposed equipment.

Service and Support

Comprehensive Solutions

We don't just sell equipment. We provide complete power distribution solutions tailored to your specific requirements.

Our team works closely with you to understand your challenges. We then design and deliver systems that solve your unique problems.

Procurement Assistance

Need additional electrical products? We assist with comprehensive procurement services. This simplifies your supply chain and ensures component compatibility.

Customer-First Philosophy

Our business philosophy centers on three principles: technology first, service paramount, and integrity fundamental.

We prioritize your interests in every decision. This approach has built lasting relationships with customers across industries and continents.

FAQ

Q: How long does SF6 gas last in the compartments?

You'll get 20-30 years of maintenance-free operation from our high-quality sealing technology. The annual leakage rate stays below 0.1%. Gas monitoring systems provide continuous pressure supervision. Refilling becomes necessary only if pressure drops below 80% of rated value, which typically indicates seal degradation requiring professional attention.

Q: Can these units operate safely in earthquake-prone regions?

Absolutely. Our RMUs achieve seismic qualification up to 0.5g horizontal acceleration. We use robust mechanical design and flexible gas connections. Testing per IEEE 693 validates structural integrity during and after seismic events. This makes our equipment suitable for high-risk geological zones worldwide.

Q: What happens if SF6 gas leaks?

Safety systems trigger alarms at 1000ppm concentration levels, well below any safety threshold. Modern units incorporate gas handling systems for safe collection during maintenance. We're also prepared to provide alternative gas options like C4F7N mixtures for customers prioritizing environmental considerations while maintaining performance.

Q: How do RMUs perform in extreme temperatures?

Standard ratings cover -40°C to +40°C. However, we offer extended temperature ratings from -50°C to +55°C through enhanced materials and gas pressure compensation. Arctic and desert installations may require specific design modifications including heated compartments and thermal barriers. We'll work with you to specify the right configuration.

Q: What remote monitoring capabilities are available?

Our advanced units integrate IoT-enabled monitoring systems. You'll receive real-time data on SF6 pressure, temperature, switching operations, and fault conditions. Remote diagnostics include partial discharge monitoring and contact wear assessment. This enables predictive maintenance strategies that prevent failures before they occur.

Q: How does this compare to air-insulated switchgear?

You'll save 30-50% space compared to conventional air-insulated equipment. The sealed design eliminates environmental concerns about dust and moisture. Maintenance requirements drop to near zero for gas compartments. While initial investment may be higher, total cost of ownership proves lower through reduced maintenance and longer service life.

Contact Us

Ready to upgrade your distribution network? Email us at tuojie@electricinchina.com for Gas Insulated Ring Main Unit (RMU) customized solutions and technical specifications.