Air-Insulated Busbar Trunking System

Air-Insulated Busbar Trunking System

Structural Features

• Conductor Layout: A certain air gap is maintained between phase conductors and between conductors and the shell. No solid insulating materials are used (or only simple insulating supports are used locally), and air is mainly relied on as the insulating medium.
• Shell Design: The shell is usually made of metal materials (such as aluminum, steel, etc.) to provide protection and mechanical support. Some shells are designed with ventilation holes to enhance air convection and improve heat dissipation.
• Support Method: Conductors are fixed in the shell through insulating brackets to ensure stable spacing between phase conductors, thus guaranteeing insulation performance and structural reliability.

Technical Parameters

• Current Rating: Generally applicable to the current range of 400A-3150A, with specific differences depending on models and specifications. For example, air-insulated busbar trunking of some brands can cover the common current range of 630A-2500A.
• Voltage Rating: Mainly used in low-voltage power distribution systems with a rated voltage of 690V and below, and the rated insulation voltage is mostly 1000V.
• Protection Class: Due to its reliance on air insulation, its protection level is relatively low, usually IP30-IP40. It is suitable for indoor environments that are dry, dust-free, and free of corrosive gases. Caution is required in harsh environments.

Application Scenarios

• Industrial Plants: It can be used for power trunk transmission in machinery processing workshops, assembly workshops, etc., where environmental conditions are good.
• Commercial Buildings: Suitable for power distribution trunks in large shopping malls, office buildings, and other buildings, especially places with certain requirements for installation space and clean environments.
• Temporary Power Supply: In some temporarily built power distribution systems, it can be used as a temporary power transmission channel due to its relatively flexible installation.

Advantages and Limitations

• Advantages:
  • Lower cost: Compared with intensive busbar trunking, it reduces the use of insulating materials, resulting in relatively lower manufacturing costs.
  • Good heat dissipation: Air gaps help dissipate heat through convection, ensuring stable heat dissipation within a certain current range.
  • Easier installation and maintenance: The structure is relatively simple, reducing the difficulty of installation and later maintenance operations.
• Limitations:
  • Insulation performance is greatly affected by the environment: The presence of dust, moisture, corrosive gases, etc., in the environment will reduce the insulation performance of air, potentially causing safety hazards.
  • Larger volume: To ensure air insulation gaps, the overall volume of the busbar trunking is relatively large, occupying more space.
  • Limited current-carrying capacity: Under high current conditions, relying solely on air for heat dissipation is insufficient, leaving limited room for increasing the current-carrying capacity.