In recent years, in the electrical design and construction site cooperation work, I have done some design of enclosed bus duct lines. Now let's talk about the relevant contents from Jinan cable bridge manufacturer.
Although the enclosed bus duct has many advantages, it is also limited by certain conditions in practical application, such as the type of power load, distribution, installation space, project investment amount and so on.
The application of enclosed bus duct in high-rise buildings generally, the construction profession will design the installation space (shaft) for the enclosed bus duct. Each floor is equipped with one or more plug-in switch boxes, and then the plug-in switch boxes send power to all electrical equipment and circuits in the form of cables and wires. In order to use electricity safely, the following points should be paid attention to in the design:
In order to ensure the continuity of the power supply line, the double circuit form should be considered, and there should be a certain safety interval between the two circuits as far as possible; When selecting the specification of enclosed bus duct, the conductor section should be as large as possible to ensure sufficient residual capacity; More sockets should be set, but the operation height and power feeder path should be considered, because too many sockets of vertically arranged enclosed bus duct will make the height of the socket box on each floor too high, which is inconvenient for operation and maintenance;
Because the impedance of enclosed bus duct is very small, the model with matching short-circuit breaking capacity should be selected when selecting the circuit breaker in the plug-in box; For enclosed bus ducts installed vertically on shear walls, it is not necessary to provide load data to building designers. For the enclosed bus duct installed vertically through the floor, the load data shall be calculated according to the following formula: load at the support point =0.5 × Building floor height × (total weight of bus duct / total length of bus duct). Since the enclosed bus duct structure is much heavier than the cable tray, it is suggested that the designer consider the hoisting space.
The application of enclosed bus duct in large-scale production and processing workshops for large-scale workshops with small single machine load and uniform distribution, such as the weaving workshop and knitting workshop of textile enterprises and the small piece processing workshop of mechanical processing enterprises, the combination of enclosed bus duct and plug-in box can be used for power supply. In this case, compared with the conventional power supply mode (cable power supply), the advantages of closed bus duct are:
The requirement for the balanced distribution of power load is not high, so it has strong adaptability to the situation that the load is very unbalanced. Even if the enclosed bus duct line has been designed or installed, it can be simply adjusted according to the new load change scheme, which cannot be compared with the conventional power supply mode (cable power supply). In addition, the low-cost plug-in box replaces the expensive low-voltage distribution cabinet and power box, which can reduce the investment. At the same time, the power switch in the plug-in box is closer to the electrical equipment, and the operation of power stop and transmission is very simple.
During design and model selection, the dynamic stability and thermal stability of the selected model should be verified or calculated according to the short-circuit current value of the system and the parameters on the sample. For details, please visit our website http://www.sddlqj.cn Consult and have a look.