Indoor AC Vacuum Circuit Breaker (with Isolation)
The UN5-40.5(G)-T1250A-31.5kA series indoor vacuum circuit breakers with isolation are suitable for transmission networks of wind and photovoltaic generators operating at 50 Hz, 3-phase AC, with a rated voltage of 40.5 kV. They can interrupt load currents, overload currents, and short-circuit currents. Specifically designed for 35 kV packaged substations, these circuit breakers can also be used as standalone electrical units in power systems (installed in switchgear cabinets or wall-mounted), and are compatible with distribution equipment, ring main units, or combined substations.
Classification
Product Center
▎Product Features
The arc-extinguishing chamber employs a vacuum interrupter, and the vacuum arc-extinguishing chamber is encapsulated in epoxy resin to form a solid-insulated pole. The wall-through solid-insulated pole is installed horizontally. The moving end of the pole is connected to the outgoing terminal via a flexible connection, while the stationary end of the pole is linked to the pivot point of the disconnecting switch’s moving blade. This arrangement effectively separates the disconnecting switch and the earthing switch into two independent compartments, ensuring that the circuit breaker can be safely maintained even when de-energized. This product features a novel design, a compact structure, long service life, reliable operation, small size, convenient operation and maintenance, and high safety.
1. The product components feature modular design, and the cabinet’s “five-protection” system is simple, reliable, and consistent.
2. The arc-extinguishing chamber circuit is encapsulated using high-quality epoxy resin material. The partial discharge level of each encapsulated pole is ≤5 pC (at 45 kV), enhancing the circuit breaker’s adaptability and reliability in harsh environments and ensuring maintenance-free operation throughout its service life.
3. The integrated design of the isolating switch, circuit breaker switch, and grounding switch results in a high-voltage vacuum circuit breaker with a clearly visible isolation gap.
4. The panel features a single-line analog marking design that is simple and easy to understand, helping to prevent accidental operation.
5. A current transformer can be installed on the outgoing side of the switchgear, allowing for a smaller cabinet or packaged substation size.
6. It can be equipped with a smart online monitoring unit and diagnostic system; the operating status of the switch can be remotely accessed via a communication module.
▎Safety Design
The indoor high-voltage AC vacuum circuit breaker with isolation features is equipped with sophisticated mechanical and electrical interlocking devices, ensuring exceptionally high operational reliability and a long service life. When paired with the corresponding outdoor switchgear, it can reliably perform safe power distribution functions, thereby guaranteeing the safety of both operators and equipment.
▎Operating Environment Conditions
Altitude: ≤5000m (When the operating altitude of the equipment exceeds 2000m, this must be specifically noted);
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 contains neither explosive nor corrosive gases, and the installation location is free from frequent, severe vibrations or shocks.
Note: If the operating environment conditions exceed those specified above, please consult our company to arrange a customized solution.
▎Applicable Standards
· Common technical requirements shared by IEC62271-1:2017 and GB/T11022-2020—Standard for High-Voltage Switchgear and Control Equipment
· IEC62271-200:2011 and GB/T3906-2020 3.6 kV to 40.5 kV AC metal-enclosed switchgear and control equipment
· IEC 62271-100:2017 and GB/T 1984-2014 AC High-Voltage Circuit Breakers
· IEC62271-105:2021 and GB/T16926-2009 AC High-Voltage Load Break Switch-Fuse Combination Apparatus
· IEC16271-102:2001+A1:2011 and GB/T1985-2014 High-voltage AC isolating switches 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~40.5kV High-Voltage Vacuum Circuit Breakers
· DL/T404-2018 3.6 kV to 40.5 kV AC Metal-Enclosed Switchgear and Control Equipment
· DL/T593-2016 Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment
▎Product Technical Specifications
▎Switch Performance Parameters
Environmentally Friendly Gas-Insulated Ring Main Unit Equipment
The UN0-12, 24/630-25kA environmentally friendly gas-insulated ring main unit is a fully sealed and fully insulated ring main unit that employs advanced vacuum interrupter technology. From the design perspective, it meets environmental requirements by being oil-free and SF6-free. All conductive parts inside the switchgear are housed in a sealed stainless steel enclosure, with dry air serving as the primary insulating medium within the enclosure. The main switch uses a vacuum arc-extinguishing system, while the isolating switch features a three-position structure. The enclosure boasts an IP67 protection rating, making it immune to the effects of condensation, frost, salt spray, pollution, corrosion, ultraviolet radiation, and other similar factors.
SF6 Gas-Insulated Ring Main Unit Equipment
UN3-12, 24-1250-2500-3150-31.5kA gas-insulated ring main units are designed and manufactured in compliance with GB and IEC standards. They feature a fully insulated, hermetically sealed structure and are suitable for harsh environments such as those characterized by pollution, salt spray, humidity, and high altitudes. A variety of configurations are available to meet even more demanding requirements. <br/> Applied to <br/> 10. Offshore and onshore wind power step-up substations for 20kV voltage grid integration <br/> 10. Offshore and onshore energy storage and photovoltaic step-up substations for 20kV voltage networks <br/> · 10, 20 kV voltage-level substations for power transmission and distribution, used for voltage boosting or reducing. <br/>
SF6 Gas-Insulated Ring Main Unit Equipment
The UN3-36, 40.5-630-25-31.5 kA series gas-insulated ring main units are designed and manufactured in compliance with GB and IEC standards. They feature a fully insulated, hermetically sealed structure and are suitable for harsh environments such as those characterized by pollution, salt spray, humidity, and high altitudes. A variety of configurations are available to meet even more demanding requirements. <br/> Applied to <br/> 33. 35kV voltage-rated box-type substations for offshore and onshore wind power generation; <br/> 33. Offshore and onshore energy storage systems and photovoltaic box-type substations for 35kV voltage networks; <br/> 33. Ring main units for substations and distribution networks operating at 35 kV.
Environmentally Friendly Gas-Insulated Ring Main Unit (Spare)
The UN0-12/630A-25kA environmentally friendly gas-insulated ring main unit is a fully sealed and fully insulated ring main unit that employs advanced vacuum interrupter technology. From the design perspective, it meets environmental requirements by being oil-free and SF6-free. All conductive parts inside the switchgear are housed in a sealed stainless steel enclosure, with dry air serving as the primary insulating medium within the enclosure. The main switch uses a vacuum arc-extinguishing system, while the isolating switch features a three-position structure. The enclosure boasts an IP67 protection rating, making it immune to the effects of condensation, frost, salt spray, pollution, corrosion, ultraviolet radiation, and other similar factors.
Contact Information
Headquarters: No. 518 Guanghua Road, Songjiang District, Shanghai
Production base: No.88 Hongyang Road，Kunshan City, Jiangsu Province
Telephone:18801089589
Website:www.qianguelectric.com
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