The power supply trunk of modern buildings plays a very important role like the aorta of the human body, and if something goes wrong, it can cause serious consequences. In the 80s of the 20th century, many stable cables were used in modern buildings. With the rapid development of cities, the power load of buildings has increased dramatically, and the limitations such as difficult to disconnect cables and small capacity have become more and more obvious. At this time, the busway with large capacity and convenient branches is widely used in various modern buildings, rather than cables, so let's learn about the advantages of busway compared to cables in modern buildings.
1. Large ampacity and low power loss
The large additional operating current of a single busway reaches 6300A, which can meet the power demand of the current large load. The large additional operating current of a single circuit cable is only 800 amps. The current carrying capacity of the busway can be stable and prevent unnecessary power loss. The cables are placed in sealed trays in such a way that unnecessary power loss is added.
2. The cooling conditions are good, and the temperature rise is low
The busway is a flat conductor, and the gross insulation material is also a thermal insulation material, which uses air to conduct heat and emit heat, and emits heat through the outer part of the metal shell. Compared with round conductor cables and pre-branched cables, busway has the characteristics of good heat dissipation and low impedance.
3. Foldable and convenient, adaptable
The busway makes it easy to separate, and when adding equipment, you only need to add a pin box nearby. When adding capacity, simply replace the protective device capacity inside the plug box. After disconnecting the prefabricated disconnect cable, the long parallel cable must be re-added between the distribution cabinet and the load, and the power supply must be blocked for normal operation. Faults can affect the safety of adjacent circuits.
Long service life and high safety function
The service life of the bus duct can be more than 30 years, and the operation is relatively safe. Because of the high short-term withstand current, it is possible to equip the plug box of the branch circuit with special protection devices such as fuses or circuit breaker protection, and there are fewer natural defects in the circuit. The life of the cable is barely more than 15 years, the line aging is simple and faulty, for each layer of tap protection, the distribution room must be controlled and protected separately.
The device is simple and the maintenance is less in the later stage.
The busway structure is small, occupies little space, and is composed of a special device bracket, which does not require additional support. In routine maintenance, it is only necessary to measure the temperature rise of the shell, new bolts, wire boxes, etc. After the fault, only the faulty plug box needs to be replaced, and the power transmission and distribution of other equipment will not be affected. It can be reused after differentiation. The cable placement structure is complex, the clear steamer needs to equip the cable tray, the underground routing needs to dig trenches, and the construction cost is high. After the fault occurs, the whole line should be stopped, the replacement cycle is long, and the loss is large.
6. Overload can be strong, and the constant temperature effect is good
The busway insulation data uses the data with an operating temperature of 100 or more. For example, busway products use DuPont polyester film with an insulation room temperature rating of 130 class B. Together, the busway shell is made of metal, which is simple to burn and has good fire resistance. As mentioned above, compared with the current carrying capacity, safety, service life, energy saving, and convenience of installation, the busway has more advantages than cables. It is believed that in the near future, in industrial factories, high-rise buildings, commercial complexes, rail transit, etc., the bus home will be more widely used in our lives, rather than cables.
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