Product Overview

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 Daqo's years of experience in designing and manufacturing fully gas-insulated switchgear, featuring eco-friendly gas insulation and vacuum arc extinguishing.

● 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

KEMA CertifiedCome with comprehensive KEMA technical certification, meeting rigorous global quality and safety standards.

01
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.

02
Space-Saving Compact StructureBoasts a highly compact design, making it ideal for installation in space-constrained areas.

03
Durable, High-Strength Gas Tank3mm 304 stainless steel, German TRUMPF laser-crafted, withstands 0.24MPa pressure. Ensures internal arcing safety, airtightness and aesthetics.

04
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.

05
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.

06
Misoperation PreventionIntegrated mechanical and electrical interlocking eliminates faults caused by incorrect operations.

07
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.

08
Smart Monitoring & AutomationAdvanced monitoring (temperature, density, current and voltage) and automation enable unattended operation and substation "five remote functions".

09
Consistent Quality AssuranceClean workshops, fully automated assembly lines, and factory inspection, testing equipment ensure product consistency and quality.

10

Technical Specifications

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