According to the different uses of the bus duct, the bus groove is generally composed of the start bus slot, the straight line bus slot (no partition jack and jack), the L-shaped straight (horizontal) curve bus, the Z-type straight (horizontal) offset bus, the T-shaped straight (horizontal) tee bus, the X-type straight (horizontal) cross-way bus, the varnage bus duct, the expansion bus duct, the terminal head, the terminal junction box, the plug-in box, the bus duct related accessories and fastening equipment.
According to the different insulation methods, the bus duct can be divided into air plug bus slot, high-density insulated plug bus slot and high-strength plug bus slot.
Air Plug Bus Slot (BMC). Because the joints between the buses are smoothly converted to copper, the weather in the south is humid, the joints are simply oxidized, the joints and the bus are in poor contact, and the contacts are simply heated, so the south side is rarely used. In addition, the volume between the joints is too large, the scale of the horizontal bus segment does not match, and the appearance is not good-looking.
High-density insulated plug bus slot (CMC). Poor moisture-proof and cooling effect. In terms of moisture resistance, moisture and water easily penetrate during the construction of the bus, so the upper insulation resistance decreases. The heating of the bus mainly relies on the shell, because of the tight arrangement between the lines, the L2 and L3 phases are slow to dissipate heat, resulting in a high temperature rise in the bus slot. The dense insulated plug busway is limited to the housing plate and can only be produced in horizontal sections below 3 meters. Because the air gap between the bus and the bus is very small, the bus will generate strong electric power when passing through a large current, resulting in overlapping natural frequencies and excessive noise.
High-strength closed bus slot (CFW). Its process manufacturing is not limited by the plate, the shell is made into a tile ball, the mechanical strength of the bus is added, and the horizontal section of the bus can be produced 13 meters long. Because the shell is made of the tile ditch method, the pit position is deliberately separated and the bus is fixed, there is an 18 mm gap between the bus ducts, the ventilation between the lines is excellent, and the moisture-proof and cooling functions of the bus slots are significantly improved, which is more suitable for the southern climate. There is a certain interval between the wires, and the temperature of the wires rises and falls, which then increases the overload capacity and reduces the natural noise. However, it generates much larger drift currents and induced resistors than a densely packed bus slot, so the conductive row cross-section must be larger than the densely packed insulated plug bus slots compared to the standard.
The plug bus groove is a trunk system with the advantages of small size, compact structure, reliable operation, current transmission, power distribution and feeding, convenient protection, low energy consumption and dynamic thermal stability. It is widely used in high-rise buildings.
The advantage of the bus duct system is that the service life is longer than that of the cable, generally about 30-50 years. In order to maximize the service life of the bus slots, the bracket on the bus is also a consideration. When the bus groove device is on the horizontal plane, the device bracket or the gantry bracket is generally used, and the device method of combining the tension spring bracket and the angle iron bracket is generally used on the shaft. When buying a large-capacity bus, it is necessary to carefully check the bracket boom and girder data, tension springs, loads, etc. Some unscrupulous enterprises choose a lower number of angle iron as the bracket data, as a result, the bus groove will produce sag displacement after a period of use, if not repaired in time, it may cause safety accidents.
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