Tubular bus bar-also known as insulated tubular busbar or dense insulated tubular busbar-is a high-current power transmission device featuring high-conductivity copper or aluminum tubes as conductors, wrapped in multiple layers of insulation material and enclosed in a metal or non-metallic protective shell. It revolutionizes traditional rectangular busbar or cable transmission, leveraging the superior physical properties of circular tubes to achieve safe, efficient, compact power delivery under ultra-high voltage (35kV+) and ultra-large current (thousands of amperes) conditions. Tubular bus bar's core advantages include excellent heat dissipation, low inductance, high mechanical strength, and exceptional reliability-making it the preferred choice for main power distribution systems in large data centers, super high-rise buildings, new energy power stations, and heavy industry.
The key technology of product lies in its tubular conductor design. Circular tubes offer the smallest surface area-to-volume ratio for a given cross-section, enabling efficient heat dissipation via internal air convection or micro-positive pressure dry air/nitrogen-outperforming flat busbars significantly. Their symmetrical cylindrical structure minimizes skin effect and proximity effect, reducing AC resistance and maximizing effective current-carrying capacity. Multi-layer insulation (PTFE tape, silicone rubber, epoxy resin impregnation) provides uniform high electric field strength and excellent aging resistance, while the enclosed aluminum-magnesium alloy shell offers mechanical protection and electromagnetic shielding. Tubular bus bar's compact structure reduces impedance and voltage drop, minimizing energy loss and enhancing system stability-with fully insulated, enclosed variants suitable for direct installation in cable trenches or air without additional safety clearances.
Product is widely used in vertical power supply for super high-rise buildings, main distribution for large data center server clusters, and new energy power stations (connecting transformers and switchgear in photovoltaic and wind farms). It is essential for heavy industry (steel and aluminum mills) and rail transit (subway main substations), replacing traditional overhead wires or rectangular busbridges in high-voltage transmission systems. Offering large current-carrying capacity, low energy loss, high safety, and easy installation, Tubular bus bar delivers unmatched value for modern high-power distribution needs.
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