NEWS

In the power supply system of high-rise buildings, power and lighting lines are often set up separately. Enclosed bus ducts, as the main power supply lines, are installed vertically along the wall in the electrical shaft for one or more lines. Due to the use of copper sheet flexible joints for the transition between the busbars in closed bus ducts, in the humid weather of the south, oxidation is prone to occur between the joints, resulting in poor contact between the joints and the busbars and causing the contacts to heat up easily. Therefore, they are rarely used in the south. Moreover, the volume between the joints is too large, the dimensions of the horizontal busbar sections are inconsistent, and the appearance is not aesthetically pleasing.

Enclosed bus ducts are classified by their uses into starting enclosed bus ducts, straight-through enclosed bus ducts (including those with and without sockets), L-shaped vertical (horizontal) curved enclosed bus ducts, Z-shaped vertical (horizontal) offset enclosed bus ducts, T-shaped vertical (horizontal) three-way enclosed bus ducts, X-shaped vertical (horizontal) four-way enclosed bus ducts, variable capacity enclosed bus ducts, expansion enclosed bus ducts, and terminal enclosed bus ducts It is composed of end caps, terminal junction boxes, plug-in boxes, related accessories and fastening devices of enclosed bus ducts, etc. Bus ducts can be classified into three types based on their insulation methods: air-type plug-in enclosed bus ducts, densely insulated plug-in enclosed bus ducts, and high-strength plug-in enclosed bus ducts.

In terms of moisture-proofing, busbars are prone to moisture and water seepage during construction, which can lead to a decrease in the insulation resistance between phases. The heat dissipation of busbars mainly relies on the casing. Due to the compact arrangement and installation of the wires, the heat energy of phases L2 and L3 dissipates slowly, resulting in a relatively high temperature rise in the closed busbar duct. Due to the limitation of the shell plate, the dense insulation plug-in closed bus duct can only produce horizontal sections no larger than 3 meters. Due to the small air gap between phases of the busbar, when a large current passes through the busbar, a strong electromagnetic force is generated, causing the magnetic oscillation frequency to form a superimposed state and resulting in excessive noise. Enclosed bus ducts are bus systems composed of metal plates (steel plates or aluminum plates) as protective shells, conductive bars, insulating materials and related accessories.

Enclosed bus ducts can be made into plug-in type enclosed bus ducts with plug-in distribution boxes at regular intervals, or into feeder type enclosed bus ducts without distribution boxes in the middle. The closed bus duct is small in size and compact in structure. Its shell is rolled into a corrugated cross-section by a forming machine, which greatly enhances its load-bearing capacity and endows it with extraordinary support strength. It can connect a 6-meter bus with a center load of 70kg and a deflection of no more than 15mm, solving the problem of inability to support hoisting in large-span installation places. The enclosed bus duct can be equipped with 2 sockets within a length of 1 meter, and 4 sockets can be set on both sides without affecting its supporting strength.