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DOS405 SF6 Gas - Insulated Ring Main Unit

The DQS Series SF6 Fully Insulated Gas-Insulated Ring Main Unit (RMU) is a high-performance medium-voltage power distribution device. It is developed with internationally advanced technologies, including SF6 gas insulation, solid insulation, interface insulation, vacuum interruption, and sealing technology. Through its fully sealed structural design, modular configuration, and intelligent upgrades, the product significantly enhances the reliability, safety, and flexibility of power distribution systems. It is suitable for medium-voltage applications in harsh environments.

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DOS405 SF6 Gas - Insulated Ring Main Unit SF6 Fully Insulated RMU 40.5kV Compact SF6 Insulated Ring Main Unit Indoor/Outdoor Maintenance-Free SF6 RMU DQS RMU Supplier & Manufacturer | 0.01% Annual Leak Rate

Advantages

Parameters

Applications

FAQs

Why Choose the DQS Series?

1. Fully Sealed & Maintenance-Free Design for Harsh Environments

· Fully Enclosed Stainless Steel Gas Tank: High-voltage live components are hermetically sealed in a stainless-steel gas tank welded with laser deep penetration technology. Combined with international leading static/dynamic sealing technology and German SEILER fully automated helium leak detection equipment, the annual gas leakage rate is ≤0.01%, and the normal service life of the gas tank exceeds 30 years.

· IP67-Rated Gas Tank Protection: Completely isolated from external humidity, dust, and corrosive gases, the equipment operates stably in extreme temperatures (-40°C to +70°C), ensuring long-term reliable performance.

2. Compact Modular Design for Flexible Applications

· 40% Space Efficiency Improvement: With a cabinet width of only 600 - 800mm and depth of 1400 - 1820mm, it can be installed in space-constrained locations such as metro mezzanines and data center switchrooms.

· Fully Modular Configuration: Standardized load switch, fuse, and circuit breaker modules support quick assembly and combination, meeting diverse power distribution needs for ring networks, radial systems, and more.

3. Multiple Safety Protections for Personnel & Equipment

· Arc Resistance Design: Equipped with professional pressure relief devices and channels, passing the AFLR 25kA/1s internal arc test to effectively release fault arc energy and prevent accident escalation.

· Dual Interlock Protection: Mechanical/electrical interlocks between circuit breakers and disconnectors prevent misoperation; extended busbars are fully insulated and shielded to reduce partial discharge risks.

4. Intelligent Upgrades for Smart Grid Integration

· Factory-Integrated Automation Solutions: Integrated smart sensors monitor real-time parameters such as switchgear temperature, circuit breaker position, and mechanical characteristics, supporting remote monitoring and fault early warning.

· Long-Life, High-Reliability Mechanisms: Load switches offer 5,000 mechanical cycles, and vacuum circuit breakers 10,000 cycles—far exceeding industry standards and reducing maintenance costs.

Parameter	Unit	Load Break Switch Cabinet	Fuse Combination Cabinet	Circuit Breaker Cabinet
Rated Voltage	kV	40.5	40.5	40.5
Rated Frequency	Hz	50/60	50/60	50/60
Rated Current	A	630	630	630
1min Power Frequency Withstand Voltage (Phase-Ground/Phase-Phase)	kV	95/118	95/118	95/118
Lightning Impulse Withstand Voltage (Phase-Ground/Phase-Phase)	kV	185/215	185/215	185/215
Rated Short-Circuit Breaking Current	kA	-	31.5	20/25
Rated Peak Making Current	kA	50/63	80	50/63
Short-Time Withstand Current/Time	kA/s	20/4s, 25/3s	-	20/4s, 25/4s
Internal Arc Resistance	-	AFLR, 25kA, 1s	AFLR, 25kA, 1s	AFLR, 25kA, 1s
Rated Gas Pressure (20°C, Gauge)	MPa	0.03	0.03	0.03
Annual Gas Leakage Rate	%/Year	≤0.01%	≤0.01%	≤0.01%

1. Urban Power Distribution Networks: Ideal for compact substations in city centers and underground cable ring rooms, solving space constraints and high-reliability power supply needs.

2. Industrial & Manufacturing Sites: Provides corrosion-resistant, maintenance-free distribution solutions for factories, mines, and chemical parks, ensuring continuous production power supply.

3. Data Centers & Commercial Buildings: Modular design supports rapid capacity expansion, and intelligent monitoring meets 24/7 uninterrupted power supply and unattended operation requirements.

4. Renewable Energy & Smart Grids: Adapts to photovoltaic/wind power integration and microgrid construction, supporting automated remote control for energy internet upgrades.

5. Transportation Hubs: Used in power distribution systems for metro, high-speed rail, and airports, meeting strict safety standards through arc resistance and high-protection design.

Q1: Does the DQS RMU require regular maintenance?

A1: No routine maintenance is needed. The fully sealed SF6 gas insulation ensures an annual leakage rate ≤0.01%, and the long-life operation mechanisms (5,000 cycles for load switches, 10,000 cycles for circuit breakers) mean only periodic remote monitoring via the intelligent system is required.

Q2: Can the equipment be used in wet or dusty environments?

A2: Yes. The gas tank has an IP67 protection rating, resisting water immersion, dust, and corrosive gases—suitable for complex environments like coastal areas, mining sites, and tunnels.

Q3: How does modular design improve installation efficiency?

A3: Pre-assembled functional modules (e.g., circuit breakers, fuses) in standardized frames connect via plug-in busbars on site, eliminating gas handling or complex debugging and reducing installation time by 50% compared to traditional equipment.

Q4: Can intelligent functions be customized?

A4: Yes. Customizable options include temperature sensors, circuit breaker status monitors, and wireless communication units, enabling real-time data upload to management platforms for SCADA or cloud-based monitoring.

Q5: Does the equipment comply with international standards?

A5: Compliant with IEC 62271-200, GB 3906, and other standards, and passed third-party type testing—suitable for global medium-voltage distribution projects.

· Technological Leadership: Integrates five core technologies with an industry-leading gas leakage rate (≤0.01%/year).

· Safety & Reliability: Arc-resistant design and dual interlocks protect personnel and equipment.

· Cost & Efficiency: Maintenance-free design reduces operational costs; modular architecture enables fast deployment and expansion.

· Smart Adaptability: Reserved automation interfaces facilitate the upgrade of traditional grids to digital and intelligent systems.

DOS405 SF6 Gas - Insulated Ring Main Unit

1. Fully Sealed & Maintenance-Free Design for Harsh Environments

2. Compact Modular Design for Flexible Applications

3. Multiple Safety Protections for Personnel & Equipment

4. Intelligent Upgrades for Smart Grid Integration

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