DQS-24 AIR Eco-Friendly Gas Insulated Ring Main Unit (SF₆-Free)Medium-Voltage Switchboard
The DQS AIR series eco-friendly gas-insulated ring main unit is a newly developed product by Daqo. It integrates internationally advanced technologies and builds on the Daqo's years of experience in designing and manufacturing fully gas-insulated switchgear, featuring eco-friendly gas insulation and vacuum arc extinguishing.
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Innovatively designed with globally leading manufacturing, this product embodies energy efficiency and environmental protection across its full lifecycle, from production and use to end-of-life recycling. Compact, maintenance-free, and easy to operate, it delivers high performance and reliable safety. As a green, energy-efficient alternative to SF₆-insulated and solid-insulated switchgear, it is ideal for power distribution network upgrades and construction.
Core Advantages & Features
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KEMA CertifiedCome with comprehensive KEMA technical certification, meeting rigorous global quality and safety standards.
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Sealed & ResilientSealed high-voltage parts (clean air insulation) resist external interference. Vacuum interrupters extinguish arcs, breakers enable early fault interruption. Optional pressure relief for lifelong maintenance-free safety.
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Space-Saving Compact StructureBoasts a highly compact design, making it ideal for installation in space-constrained areas.
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Durable, High-Strength Gas Tank3mm 304 stainless steel, German TRUMPF laser-crafted, withstands 0.24MPa pressure. Ensures internal arcing safety, airtightness and aesthetics.
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Ultra-Leakproof, Long-Lasting PerformanceGerman SEILER equipment ensures ≤0.1% annual leak rate and 99.99% pure eco-friendly gas, supporting a 40-year service life.
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Flexible Modular ExpansionModular design allows single and common-tank combinations with side and top expansion options, extended busbars are fully enclosed and grounded for safety.
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Misoperation PreventionIntegrated mechanical and electrical interlocking eliminates faults caused by incorrect operations.
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Long Mechanical LifespanVacuum circuit breakers (10,000 times), load switches (5,000 times), three-position switches (3,000 times) boast robust durability, grounding switches handle 5 short-circuit closures.
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Smart Monitoring & AutomationAdvanced monitoring (temperature, density, current and voltage) and automation enable unattended operation and substation "five remote functions".
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Consistent Quality AssuranceClean workshops, fully automated assembly lines, and factory inspection, testing equipment ensure product consistency and quality.
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Technical Parameters
| Basic Parameters | ||
|---|---|---|
| Circuit Breaker Unit | Load Break Switch Unit | |
| Rated voltage | 24 kV | 24 kV |
| Rated frequency | 50 Hz / 60 Hz | 50 Hz / 60 Hz |
Rated power frequency withstand voltage (1min) | 50 kV / 60 kV | 50 kV / 60 kV |
| Rated lightning impulse withstand voltage | 125 kV / 145 kV | 125 kV / 145 kV |
| Rated continuous current | 630 A | 630 A |
Rated short-time withstand current (3s) /Rated peak withstand current | 21 kA / 54.6 kA | 21 kA / 54.6 kA |
Rated short-time withstand current of earthing circuit (2s) | 21 kA / 54.6 kA | 21 kA / 54.6 kA |
| Rated making current | 54.6 kA | 54.6 kA |
| Rated making current of earthing switch | 54.6 kA | 54.6 kA |
| Rated short-circuit breaking current | 21 kA | / |
| Mechanical endurance | 10000 Times | 5000 Times |
| Electrical endurance | Grade E2 | Grade E3 |
| Internal arc classification | 21 kA, 1 s | 21 kA, 1 s |
| Maximum permissible gas leakage rate | ≤0.1% / Year | ≤0.1% / Year |
| Gas compartment protection level | IP 67 | IP 67 |
| Enclosure protection class | IP 54 / IP 4X | IP 54 / IP 4X |
Product Documents
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Product Brochure
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Product Certification
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DQS-24 Air Eco-friendly Ring Main Unit
2025-11-25
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Type Test Report - KEMA - DQS-24 AIR Eco-Friendly RMU (SF₆-Free) - Load Break Switch Unit Dielectric Tests
2026-01-06
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Type Test Report - KEMA - DQS-24 AIR Eco-Friendly RMU (SF₆-Free) - Ciruit Breaker Unit Dielectric Tests
2026-01-06
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Report of Performance - KEMA - DQS-24 AIR Eco-Friendly RMU (SF₆-Free) - Load Break Switch Unit Making and Breaking Tests
2026-01-06
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Report of Performance - KEMA - DQS-24 AIR Eco-Friendly RMU (SF₆-Free) - Circuit Breaker Unit Making and Breaking Tests
2026-01-06
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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.
