SF6 Gas-Insulated Ring Main Unit (Spare)

(1) Safety
· The switchgear is equipped with comprehensive mechanical interlocking and electrical interlock functions.
The enclosure and cable compartment structures meet the 25 kA/1s arc-fault requirement.
· The enclosure has good grounding continuity.
(2) Reliable
· The stainless steel gas tank boasts an IP67 protection rating and requires no refilling or maintenance throughout its service life.
· The air box design strength meets the requirements for altitudes of 5,000 m and below.
· The operating mechanism meets the 720-hour salt spray test requirement.
(3) Anti-fouling and moisture-proof
· Suitable for operation in environments with industrial pollution, salt content, and high humidity.
· Corrosion protection rating for switchgear: Onshore—C4; Offshore—C4H
· All connections between secondary components use moisture-proof, damp-proof, and mold-resistant connectors.

(4) Flexible combination
· It supports independent unit configuration combinations as well as shared-cabinet combinations.
· Load switches, circuit breakers, switchgear assemblies, and PTs can be freely combined.
· Coils, auxiliary contacts, and other components can be flexibly configured according to user requirements.
(5) Smart Management
· Provide intelligent solutions to facilitate digital upgrades.
· Provides online monitoring functions for selectable switch states, mechanical characteristics, vacuum status, temperature, and partial discharge.
· Supports remote operation, monitoring, and management
· The installation and user manual can be accessed via a QR code.

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 no explosive or 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.

IEC62271-1:2017 and GB/T11022-2020—Common Technical Requirements for High-Voltage Switchgear and Control Equipment
IEC62271-200:2011 and GB/T3906-2020 3.6kV~40.5kV AC metal-enclosed switchgear and control equipment
IEC62271-100:2017 and GB/T1984-2014 AC High-Voltage Circuit Breakers
IEC62271-105:2021 and GB/T16926-2009—AC High-Voltage Load Switch-Fuse Combination Apparatus
IEC 16271-102:2001 + A1:2011 and GB/T 1985-2014 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 3.6kV~40.5kV AC Metal-Enclosed Switchgear and Control Equipment
DL/T593-2016 Common Technical Requirements for Standards of High-Voltage Switchgear and Control Equipment

Qian Gu Electric is committed to environmental protection. Its products are certified under the ISO 14001 international environmental management system and strictly adhere to this standard.
Recycling and Disposal
The design and manufacture of UN3 series switchgear comply with the requirements of 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 manufacturing 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. Secondary Control Room: Located at the upper front of the switchgear cabinet, with a protection rating of up to IP4X.
2. Simulated busbar: Accurately indicates the wiring configuration of the primary circuit.
3. Pressure Relief Channel: The pressure relief channel is located at the bottom of the switchgear cabinet. It allows arc gases generated in the gas-insulated enclosure or cable compartment to be vented through the pressure relief channel at the bottom of the cabinet into the cable trench, thereby ensuring the safety of operating personnel.
4. Busbar connection: Under normal operating conditions, the rated current shall be 1.1 times the rated current of 630A.
5. Circuit Breaker and Mechanism: The circuit breaker is equipped with a spring-operated mechanism and features automatic reclosing functionality. It can be manually or electrically energized and supports remote signaling, remote control, and remote measurement.
6. Disconnecting switch and operating mechanism; can be operated manually or electrically, and can be controlled either on-site or remotely.
7. Cable Connection and Surge Arrester Installation: Install and maintain cables and their accessories from the front of the cabinet, at an installation height of 600–700 mm. This installation method is suitable for single-core or three-core cables of various specifications.