Comparison between air bus duct and intensive bus duct

The voltage drop index of the general low-voltage system transmission lines mainly depends on the resistance, capacitance reactance and inductance reactance of the transmission lines. The air-type enclosure is made of magnetic material (steel), and the eddy current phenomenon is obvious, with large capacitance reactance and inductance reactance, obvious voltage drop and large power loss. However, the compact structure of the compact busbar greatly reduces the impedance of the busbar system. The aluminum-magnesium alloy enclosure further avoids the occurrence of magnetic hysteresis and eddy current phenomenon, resulting in a very small voltage drop of the entire system and very low energy consumption. It generates less heat and dissipates heat quickly.

The compact busbar has an extremely low impedance feature that is unmatched by the air type busbar, and the heat generation index of the compact busbar is smaller. The busbar system is a fully enclosed structure, and the maximum protection level can reach IP68. Therefore, the heat transfer method of the compact busbar is "thermal conduction", which can quickly dissipate heat through the copper busbar and the aluminum-magnesium alloy enclosure, greatly enhancing the conductive efficiency of the copper bar and optimizing the current-carrying section of the copper bar. The heat transfer method of the air type busbar is "radiation", and the thermal "conduction" between metals is bound to be superior to the thermal "radiation" of the gas medium. Moreover, the majority of the shells of air type busbar channels adopt steel enclosures, resulting in poor heat dissipation effect. In order to ensure the current-carrying capacity of the busbar channel, it is necessary to increase the section of the copper bar, increasing the cost. Therefore, relatively speaking, the cost performance of the air type busbar channel is not high and it is gradually eliminated and updated by the market.

The air type busbar has an inevitable "chimney effect". Once there is a fire at one point, its hollow structure acts exactly like a chimney, accelerating the spread of the fire, presenting a serious safety hazard.

The air type busbar has less strict requirements on the environment and can meet the needs of spaces with relatively high humidity, high-rise buildings, etc. It has a very obvious advantage in terms of product durability.

The air type busbar is convenient for maintenance. The air type adopts the method of insulation spacer plus bolt fixation, and in an emergency, the insulation components and conductors can be disassembled and replaced on site.

The insulation of the air type busbar channel is in the form of insulation spacers plus bolt fixation, so the insulation effect also has a great advantage over the compact busbar channel.