A tubular dense busbar is a hollow, high-conductivity conductor, typically made of aluminium or its alloys, designed to efficiently carry large currents while minimizing weight and improving heat dissipation.

Overview

A tubular busbar is a hollow conductor used in electrical power systems to transmit high currents between sources (like transformers or substations) and load centers. Unlike solid or flat busbars, the tubular design provides a high strength-to-weight ratio, excellent mechanical rigidity, and improved thermal performance due to the large surface area relative to its cross-section, which enhances heat dissipation during operation .

Material and Construction

Tubular busbars are commonly made from high-purity aluminium or aluminium alloys such as 6061, 6063, 1350, 1370, 1060, and 1070 . Aluminium is preferred for its lightweight, corrosion resistance, recyclability, and cost-effectiveness compared to copper, while still offering sufficient electrical conductivity. The hollow, seamless construction ensures uniform cross-section, smooth surfaces, and minimal defects, which are critical for reliable current transmission .

Electrical Performance

• Current Carrying Capacity: The tubular shape efficiently supports high currents. In AC systems, the skin effect causes current to flow primarily near the surface, making hollow tubes more efficient than solid rods of the same diameter .
• Voltage Drop: The large surface area reduces resistance and voltage drop, particularly in high-frequency applications .
• Heat Dissipation: Hollow geometry allows better thermal management, reducing temperature rise during operation .

Mechanical and Installation Advantages

• Rigidity and Strength: Tubular busbars maintain structural integrity while being lighter than solid bars .
• Bending and Fabrication: Aluminium tubular busbars can be bent using standard industry methods, with recommended inner bending radii of 5–7 times the nominal pipe size for certain alloys .
• Customizable Dimensions: Diameter, wall thickness, and length can be tailored to meet specific current ratings, space constraints, and connection requirements .

Applications

Tubular dense busbars are widely used in:

• Power Transmission and Substations: As connecting conductors and overcurrent conductors in high-voltage systems .
• Switchgear and Distribution Boards: For compact, high-current connections .
• Industrial Equipment: Electrical conduction and grounding in machinery .
• Transportation and E-Mobility: Electrical systems in vehicles, trains, and aircraft .

Summary

A tubular dense busbar combines the advantages of aluminium's lightweight and corrosion resistance with a hollow, high-surface-area design that optimizes current-carrying capacity, heat dissipation, and mechanical strength. Its versatility in fabrication and installation makes it ideal for high-current, high-performance electrical systems across industrial, utility, and transportation applications .