· This product is designed and manufactured in compliance with GB and IEC standards.
· Manufactured with a structural design featuring vacuum arc-extinguishing and all-insulated by SF6 gas;
· The enclosure’s protection rating reaches IP67, and during installation and throughout its service life, it requires no unscheduled inflation or re-inflation.
· The product meets requirements for altitudes of 5,000 meters and below;
· Suitable for operation in environments with industrial pollution, salt spray, and high humidity; meets C3 standards on land and C4 standards at sea.
Altitude: ≤5000m (Special note required if the equipment is operated at an altitude exceeding 2000m);
Ambient temperature: Maximum temperature +50℃, minimum temperature -50℃, average value within 24 hours ≤35℃;
Environmental humidity: Average relative humidity over 24 hours ≤ 95%; average monthly relative humidity ≤ 90%.
Electromagnetic interference: The amplitude of electromagnetic interference induced in the secondary system ≤ 1.6 kV;
Installation environment: The surrounding air must be free of explosive and corrosive gases, and the installation location must be free of frequent, severe vibrations or impacts.
Note: If the operating environment conditions exceed those specified above, please consult our company to discuss custom solutions.
IEC 62271-1:2017 and GB/T 11022-2020—Common Technical Requirements for High-Voltage Switchgear and Control Equipment
IEC 62271-200:2011 and GB/T 3906-2020: 3.6 kV to 40.5 kV AC metal-enclosed switchgear and controlgear
IEC62271-100:2017 vs. GB/T1984-2014 — AC High-Voltage Circuit Breakers
IEC 62271-105:2021 and GB/T 16926-2009—AC High-Voltage Load Break Switch-Fuse Combination Apparatus
IEC 16271-102:2001+A1:2011 and GB/T1985-2014—High-voltage AC disconnectors and earthing switches
IEC60529 and GB/T4208-2017: Enclosure Protection Ratings (IP Codes)
GB/T11023-2018 — Test Method for Gas Sealing of Sulfur Hexafluoride in High-Voltage Switchgear; DL/T402-2016 — Technical Specifications for Ordering High-Voltage AC Circuit Breakers
DL/T486-2021 Technical Specifications for Ordering High-Voltage AC Disconnect Switches and Earthing Switches
DL/T403-2017 Technical Specifications for Ordering 12kV to 40.5kV High-Voltage Vacuum Circuit Breakers
. DL/T404-2018 3.6kV～40.5kV AC Metal-Enclosed Switchgear and Control Equipment; DL/T593-2016 Common Technical Requirements for High-Voltage Switchgear and Control Equipment
Qian Gu Electric is committed to environmental protection. Its products have obtained ISO 14001 international environmental management system certification and strictly adhere to this standard.
Recycling and Disposal
The UN3 series switchgear is designed and manufactured in compliance with the national standard GB/T 3906 and the international standard IEC 62271-200. At the end of the product’s lifecycle, SF6 gas will be recovered and reused in accordance with relevant standards.
Sustainable development
The UN3 series switchgear continuously reduces the use of SF6 during the manufacturing process and does not use SF6 gas during installation.
All products are made from 100% recyclable materials;
Provide self-powered relays and devices to avoid additional energy consumption.
1. Side-mounted main busbar: Rated current meets 1250A and 2500A.
2. Independent busbar room: Meets the requirements for single-cabinet or dual-cabinet configurations.
3. Three-position disconnector and mechanism: Can be operated manually or electrically.
4. Circuit Breaker and Mechanism: The circuit breaker is equipped with a spring mechanism and features automatic reclosing functionality. It can be manually or electrically energized.
5. Installation of cable accessories and surge arresters: C-type bushings—choose either 1 set of cables + surge arrester or 2 sets of cables + surge arrester.
6. Cable Room: Meets installation requirements for cables of various specifications.
7. Cable Room Pressure Relief Channel
8. Air box pressure relief channel
9. Circuit Breaker Room
10. Compartment bushing
11. Nameplate
12. Simulated busbar
13. Protective device
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Operating continuity levels defined in GB/T 3906 |
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Other high-voltage compartments or functional units remain energized. |
LSC 1: Lower service continuity |
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LSC 1 | LSC 2 |
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LSC 2: Higher Service Continuity |
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● | |
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Partition between compartments |
PI: Insulating partition |
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PI |
PM |
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PM: Metal Grounding Baffle |
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● | |
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Insulation and Switching |
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Main circuit disconnection |
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Vacuum circuit breaker |
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Interrupting medium |
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Vacuum arc-extinguishing chamber |
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Insulating medium |
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SF6 gas | |
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Relative inflation pressure |
Rated inflation pressure (gauge pressure at 20℃) |
MPa |
0.04 |
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Minimum inflation pressure (gauge pressure at 20℃) |
MPa |
0.02 |
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Annual relative leakage rate of gas |
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%/year |
s0.01 |
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Insulation level |
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Rated voltage |
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kV |
36/40.5 | |
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Rated frequency |
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Hertz |
50 |
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Rated insulation level |
Power-frequency withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter contacts) |
kV |
70/95 | |
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Power-frequency withstand voltage (isolated break) |
kV |
80/118 | ||
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Power-frequency withstand voltage (auxiliary and control circuits) |
kV |
2 |
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Lightning impulse withstand voltage (phase-to-phase, phase-to-ground, vacuum interrupter) |
kV |
170/185 |
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Lightning Impulse Withstand Voltage (Isolation Break) |
kV |
195/215 | ||
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Current level |
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Rated current—busbar |
A |
1250/2500/3150 | ||
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Rated short-circuit breaking current |
kA |
31.5 | ||
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Rated short-circuit making current (main switch/grounding switch) |
kA |
80/80 | ||
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Short-time withstand current and duration (main circuit + earthing switch, earthing connection) |
kA/s | 31. 5/4 · 27.4/2 | ||
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Rated peak withstand current (main circuit + earthing switch, earthing connection) |
kA |
80/68 | ||
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Internal arc fault withstand capability |
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Grade A |
A FL front and side views |
kA |
31.5 | |
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Duration |
S |
0.5 | ||
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Enclosure protection rating |
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Complies with GB/T4208 standard enclosure protection. |
An energized electrical box |
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IP67 |
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Cable Room |
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IP43 |
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Institutional Room |
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IP4X |
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Low-pressure room |
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IP4X |
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Mechanical impact protection rating |
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Grade compliant with GB/T 20138 |
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IK07 | ||
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Other features |
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Expected service life |
Year |
30 |
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Busbar/Grounding busbar (copper bar) |
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240 mm² |
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