Dense busbarIt is a kind of dense busbar column, the material can be copper or aluminum, which is a metal device. Moreover, this metal device is closed-type, which can be used to distribute the high power of various components, mainly used in the power transmission of low-voltage power lines and cables in households.

　　Common types of dense busbars:

　　1. According to the purpose

　　Dense busbars generally consist of starting dense busbars, straight dense busbars, L-shaped vertical bending dense busbars, Z-shaped vertical offset dense busbars, T-shaped vertical three-way dense busbars, X-shaped vertical four-way dense busbars, variable capacity dense busbars, expansion dense busbars, terminal heads, terminal junction boxes, plug-in boxes, dense busbar related accessories and fittings.

　　2. According to the insulation method

　　It can be divided into three types: air-sealed dense busbar, dense insulation sealed busbar and high-strength sealed busbar.

　　(1) Air-plugged dense busbars are rarely used in the south because the joints between busbars are copper sheet soft connections. The weather in the south is humid, and the joints are easy to oxidize, resulting in poor contact between the joints and the dense busbars, and the contacts are easy to overheat. Moreover, the volume between the joints is too large, and the Size of the horizontal busbar section is inconsistent, and the appearance is not beautiful enough.

　　(2) Dense insulation plug busbar

　　Its moisture-proof and heat dissipation effect is poor. In terms of moisture-proof, during the construction of dense busbars, it is easy to be damp and seep water, resulting in a decrease in the interphase insulation resistance. The heat dissipation of the bus mainly relies on the shell. Due to the compact arrangement and installation of the wires, the heat energy of L2 phase and L3 phase dissipates slowly, resulting in an increase in the temperature of the dense busbar. Limited by the shell plate, the dense insulation plug-in busbar can only produce horizontal sections no larger than 3m. Because the air gap between busbars is very small, when the dense busbar passes a large current, it generates a strong electromotive force, causing the magnetic oscillation frequency to form a superimposed state, and generating excessive noise.

　　(3) High-strength closed dense busbar

　　Its manufacturing process is not limited by the plate material, the shell adopts a tile trench form, which increases the mechanical strength of the dense busbar, and the horizontal section of the busbar can be produced up to 13 meters long. Because the shell is made in a tile trench form, the busbars are intentionally separated and fixed in the trench position, with a busbar spacing of 18mm, and good ventilation between the lines, which significantly improves the moisture-proof and heat dissipation function of the dense busbar, making it more suitable for southern climates; due to a certain gap between the conductors, the temperature rise of the conductors is reduced, improving the overload capacity and reducing the magnetic oscillation noise. However, the stray current and reactance generated are much greater than the dense busbar, so when comparing the same Specification, the conductive busbar section must be larger than the dense insulation dense busbar.

　　Where are dense busbars used?

　　1. The fixing method of the busbar is supported by a tough metal shell, which can withstand the stability under large electric shock. Due to the large mechanical stress, busbars with large width-thickness ratio can be used for vertical arrangement.

　　2. The busbar has a large current carrying capacity, the current density is increased, and the product cost is greatly reduced. The bus connector and socket structure of dense busbars are more complex, the manufacturing difficulty is increased, and the production process cost is high.

　　3. The busbar uses a busbar with a large width-thickness ratio, the heat dissipation area of the busbar itself is increased, it is directly conducted to the shell through the insulating material, and strong convective heat dissipation is used, so the heat dissipation condition is improved.

　　4. Due to the use of busbars with large width-thickness ratio, the heat generation is small and the heat dissipation is large. Therefore, the current carrying capacity is greatly increased, which can be used for high-current busbars.