DQN-12 Gas-Insulated Ring Main Unit (SF₆-Free)Medium-Voltage Switchboard
The DQN-12 RMU is an innovative, eco-friendly solution that uses nitrogen/dry air insulation combined with vacuum arc-extinguishing technology. It represents a significant step towards green energy efficiency in power distribution.
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This product features a compact, maintenance-free design that is simple to operate and highly reliable. It serves as a sustainable alternative to traditional SF₆ and solid-insulated switchgear, ideal for the construction and upgrade of modern power distribution networks.
Core Advantages & Features
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Robust & Safe DesignStainless steel-enclosed live components use nitrogen insulation, environment-resistant. Vacuum switching; breakers replace load switch-fuse for early fault disconnection. Optional pressure relief: safer, lifelong maintenance-free.
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Compact Modular DesignOptimized layout allows flexible configuration while maintaining a small footprint suitable for restricted spaces.
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Robust Tank ConstructionManufactured from 3mm 304 stainless steel using advanced TRUMPF laser cutting and welding technology, the tank withstands 0.3 MPa pressure and offers excellent gas tightness and aesthetics.
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Ultra-Low Leak RateTested and filled using SEILER helium detection systems, ensuring a leak rate below 0.01% per year with 99.99% nitrogen purity and a 40-year service life.
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Flexible Modular ExpansionSupports single or common gas compartment configurations, with side or top expansion options. The fully enclosed, grounded expansion busbar guarantees operational safety.
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Comprehensive Interlock ProtectionMechanical and electrical interlocks work in tandem to prevent misoperation and ensure safe operation.
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Long Mechanical LifespanVacuum interrupters achieve 10,000 operations, while three-position switches reach 3,000 operations. Grounding switches handle unlimited short-circuit closings.
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Smart Monitoring and Quality AssuranceEquipped with temperature rise, density, and current-voltage monitoring for unmanned substation operation, automated assembly ensures consistency and reliability.
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Quality & ConsistencyCleanroom facilities, fully automated assembly lines, and factory inspection and testing equipment ensure product consistency and quality.
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Technical Parameters
| Basic Parameters | |
|---|---|
| Rated voltage | 12 kV |
| Rated frequency | 50 Hz |
| Rated current | 630 A |
| Rated power frequency withstand voltage | 42/48 kV (Isolation gap) |
| Rated lightning impulse withstand voltage | 75/85 kV (Isolation gap) |
| Mechanical life | 10000 times |
Rated short-circuit breaking current | 20 kA |
| Rated making current | 50 kA |
| Main circuit rated short-time withstand current (4s) | 20 kA |
| Main circuit rated peak withstand current | 50 kA |
| Internal arc classification | AFLR, 20 kA, 0.5s |
| Enclosure protection degree | IP4X |
| Gas compartment protection degree | IP67 |
Annual gas leakage rate | ≤0.01% |
Product Documents
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Product Brochure
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DQN-12 Series Eco-Friendly Gas Insulated Ring Main Unit
2025-11-25
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The company consistently maintains robust innovative vitality, standing at the forefront of the industry and driving its advancement. Through cutting-edge technologies and products, it achieves goals of energy conservation, environmental protection, quality enhancement, and consumption reduction, continuously contributing to the development of a resource-efficient and environmentally friendly society.
